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1

Ternary ceramic alloys of Zr-Ce-Hf oxides  

DOE Patents [OSTI]

A ternary ceramic alloy is described which produces toughening of zirconia and zirconia composites through the stress transformation from tetragonal phase to monoclinic phase. This alloy, having the general formula Ce[sub x]Hf[sub y]Zr[sub 1[minus]x[minus]y]O[sub 2], is produced through the addition of appropriate amounts of ceria and hafnia to the zirconia. Typically, improved toughness is achieved with about 5 to about 15 mol % ceria and up to about 40 mol % hafnia. The preparation of alloys of these compositions are given together with data as to the densities, tetragonal phase content, hardness and fracture toughness. The alloys are useful in preparing zirconia bodies as well as reinforcing ceramic composites. 1 fig.

Becher, P.F.; Funkenbusch, E.F.

1990-11-20T23:59:59.000Z

2

ACCEPTED MANUSCRIPT The behaviour of Rare-Earth Elements, Zr and Hf during biologically-mediated  

E-Print Network [OSTI]

ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 1 The behaviour of Rare-Earth Elements, Zr and Hf during.a,b* , Cangemi M.a , Brusca L.c , Madonia P.c , Saiano F.d , Zuddas P.e a) Department of Earth and Marine at the solid-liquid interface influencing the distribution of trace elements onto microbial surfaces. Since

3

Stress effects on superconducting properties of the composite-processed V/sub 2/(Hf,Zr)  

SciTech Connect (OSTI)

The superconducting critical current I/sub c/ (4.2 K) of V/sub 2/(Hf,Zr) composite tape was measured under tensile load. I/sub c/ values of the V/sub 2/(Hf,Zr) composite tape do not change at all up to a strain level of 0.55%, and then decrease irreversibly with respect to strain, although the stress-strain curves for these tapes exhibit no irreversible behavior. Many cracks were observed in the V/sub 2/(Hf,Zr) layer of the composite tape strained up to 0.6%. Thermal expansion data indicate that the residual tensile stress may be produced in the V/sub 2/(Hf,Zr) layer by the large thermal contraction of the layer and may reduce the strain tolerance of the composite tape.

Inoue, K.; Wada, H.; Kuroda, T.; Tachikawa, K.

1981-06-01T23:59:59.000Z

4

Electronic structure and magnetic susceptibility of the different structural modifications of Ti, Zr, and Hf metals  

Science Journals Connector (OSTI)

The electronic structure of the early transition metals Ti, Zr, and Hf has been investigated for the hexagonal (?), hcp (?), bcc (?), and fcc phases using the linear-muffin-tin-orbital method of band-structure calculation. The results of these investigations are discussed in the light of previous band-structure calculations and experimental data closely related to the electronic structure (low-temperature specific heat, superconductive properties and magnetic susceptibility). It is found from the theoretical calculations that the electronic density of states at the Fermi level increases in the phase sequence hexagonal (?)?hcp (?)?fcc?bcc (?) and this behavior is unambiguously reflected in all the experimental data as well. A separation of the magnetic susceptibility into its components is performed and from this, the temperature dependence of the Pauli susceptibility for Ti, Zr, and Hf is deduced.

I. Bakonyi, H. Ebert, and A. I. Liechtenstein

1993-09-15T23:59:59.000Z

5

Ternary ceramic alloys of ZR-CE-HF oxides  

DOE Patents [OSTI]

A ternary ceramic alloy which produces toughening of zirconia and zirconia composites through the stress transformation from tetragonal phase to monoclinic phase. This alloy, having the general formula Ce.sub.x Hf.sub.y Zn.sub.1-x-y O.sub.2, is produced through the addition of appropriate amounts of ceria and hafnia to the zirconia. Typically, improved toughness is achieved with about 5 to about 15 mol % ceria and up to about 40 mol % hafnia. The preparation of alloys of these compositions are given together with data as to the densities, tetragonal phase content, hardness and fracture toughness. The alloys are useful in preparing zirconia bodies as well as reinforcing ceramic composites.

Becher, Paul F. (Oak Ridge, TN); Funkenbusch, Eric F. (White Bear Lake, MN)

1990-01-01T23:59:59.000Z

6

First-principles phase diagram calculations for the HfCTiC, ZrCTiC, and HfCZrC solid O. Adjaoud,1,*,  

E-Print Network [OSTI]

Transition metal carbides, including the NaCl-structured group IV Ti, Zr, and Hf carbides, have extremely of oxidizing agents, and retain good corrosion resistance to high temperature.1,5,6 The transition-metal high melting points and are therefore referred to collectively as the "refractory carbides

Steinle-Neumann, Gerd

7

Mechanistic investigation of vinylic carbonfluorine bond activation of perfluorinated cycloalkenes using Cp*2ZrH2 and Cp*2ZrHF  

E-Print Network [OSTI]

using Cp*2ZrH2 and Cp*2ZrHF Bradley M. Kraft a , Eric Clot b , Odile Eisenstein b , William W behaves similarly [4]. In contrast, Cp*Rh(PMe3)H2 reacts with C6F6 by way of an SNAr2 attack by its conjugate base to give Cp*Rh(PMe3)(C6F5)H and fluoride ion, resulting in an autocatalytic reaction [5]. Cp

Jones, William D.

8

Plasma analyses during femtosecond laser ablation of Ti, Zr, and Hf  

SciTech Connect (OSTI)

Femtosecond laser ablation of Ti, Zr, and Hf has been investigated by means of in situ plasma diagnostics. Fast imaging was used to characterize the plasma plume expansion on a nanosecond time scale. In addition, time- and space-resolved optical emission spectroscopy was employed to determine the plume composition and the characteristic expansion velocities of plasma species. It is shown that two plume components with different expansion velocities are generated by the interaction of ultrashort laser pulses with metals. The composition and the expansion behavior of the two components have been analyzed as a function of laser fluence and target material. The results are discussed in terms of mechanisms responsible for ablation by ultrashort laser pulses.

Grojo, D.; Hermann, J.; Perrone, A. [LP3-UMR 6182 Centre National de la Recherche Scientifique, Faculte des Sciences de Luminy, Case 917, 13288 Marseille Cedex 9 (France); University of Lecce, Physics Department and National Nanotechnology Laboratory, 73100-Lecce (Italy)

2005-03-15T23:59:59.000Z

9

Thermal properties of La2O3-doped ZrB2- and HfB2-based ultra-high temperature ceramics  

Science Journals Connector (OSTI)

Abstract Thermal properties of La2O3-doped ZrB2- and HfB2-based ultra high temperature ceramics (UHTCs) have been measured at temperatures from room temperature to 2000 °C and compared with SiC-doped ZrB2- and HfB2-based \\{UHTCs\\} and monolithic ZrB2 and HfB2. Thermal conductivities of La2O3-doped \\{UHTCs\\} remain constant around 55–60 W/mK from 1500 °C to 1900 °C while SiC-doped \\{UHTCs\\} showed a trend to decreasing values over this range.

E. Zapata-Solvas; D.D. Jayaseelan; P.M. Brown; W.E. Lee

2013-01-01T23:59:59.000Z

10

Effect of strain on the critical parameters of V/sub 2/(Hf, Zr) Laves phase composite superconductors  

SciTech Connect (OSTI)

Strain effects on the critical parameters of composite-processed V/sub 2/(Hf, Zr) Laves phase superconductors have been examined. The critical temperature is found to be insensitive to the strain induced by the thermal differential contraction between the composite components. Critical current versus uniaxial strain curves obtained are completely flat at magnetic fields up to 19 T. It also turns out that the bulk upper critical field shows essentially no sensitivity to uniaxial strain. These results, which are quite different from those reported for A15 compound superconductors, are discussed in terms of the structural insensitivity of the Laves phase superconductor. Fractography suggests that the mechanical properties of V/sub 2/(Hf, Zr) composite conductors may be improved by the grain refinement of component alloys.

Wada, H.; Inoue, K.; Tachikawa, K.; Ekin, J.W.

1982-05-01T23:59:59.000Z

11

Memory functions of nanocrystalline cadmium selenide embedded ZrHfO high-k dielectric stack  

SciTech Connect (OSTI)

Metal-oxide-semiconductor capacitors made of the nanocrystalline cadmium selenide nc-CdSe embedded Zr-doped HfO{sub 2} high-k stack on the p-type silicon wafer have been fabricated and studied for their charge trapping, detrapping, and retention characteristics. Both holes and electrons can be trapped to the nanocrystal-embedded dielectric stack depending on the polarity of the applied gate voltage. With the same magnitude of applied gate voltage, the sample can trap more holes than electrons. A small amount of holes are loosely trapped at the nc-CdSe/high-k interface and the remaining holes are strongly trapped to the bulk nanocrystalline CdSe site. Charges trapped to the nanocrystals caused the Coulomb blockade effect in the leakage current vs. voltage curve, which is not observed in the control sample. The addition of the nanocrystals to the dielectric film changed the defect density and the physical thickness, which are reflected on the leakage current and the breakdown voltage. More than half of the originally trapped holes can be retained in the embedded nanocrystals for more than 10 yr. The nanocrystalline CdSe embedded high-k stack is a useful gate dielectric for this nonvolatile memory device.

Lin, Chi-Chou; Kuo, Yue [Thin Film Nano and Microelectronics Research Laboratory, Artie McFerrin Department of Chemical Engineering, Texas A and M University, College Station, Texas 77843-3122 (United States)

2014-02-28T23:59:59.000Z

12

Experimental and theoretical studies on the C15 intermetallic compounds MV{sub 2} (M = Zr, Hf and Ta): Elasticity and phase stability  

SciTech Connect (OSTI)

The phase stability of C15 HfV{sub 2} was studied by specific heat measurements. The elastic constants of C15 HfV{sub 2} were measured by the resonant ultrasound spectroscopy. Total energy and electronic structure of C15 intermetallic compounds MV{sub 2} (M = Zr, Hf and Ta) were calculated using the linear muffin tin orbital (LMTO) method. The band structures at X-point near the Fermi level were used to understand the anomalous shear moduli of the C15 HfV{sub 2} and ZrV{sub 2}. It was found that the double degeneracy with a linear dispersion relation of electronic levels at the x-point near the Fermi surface is mainly responsible for the C15 anomalous elasticity at high temperatures. The densities of states at Fermi level and the geometry of the Fermi surface were used to explain the low temperature phase instability of C15 HfV{sub 2} and ZrV{sub 2} and the stability of C15 TaV{sub 2}. The relationship between the anomalous elasticity and structural instability of C15 HfV{sub 2} and ZrV{sub 2} were also studied.

Chu, F.; Mitchell, T.E.; Chen, S.P. [Los Alamos National Lab., NM (United States); Sob, M.; Siegl, R.; Pope, D.P. [Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering

1994-12-01T23:59:59.000Z

13

Two-Dimensional Polaronic Behavior in the Binary Oxides m-HfO2 and m-ZrO2  

SciTech Connect (OSTI)

We demonstrate that the three-dimensional (3D) binary monoclinic oxides HfO{sub 2} and ZrO{sub 2} exhibit quasi-2D polaron localization and conductivity, which results from a small difference in the coordination of two oxygen sublattices in these materials. The transition between a 2D large polaron into a zero-dimensional small polaron state requires overcoming a small energetic barrier. These results demonstrate how a small asymmetry in the lattice structure can determine the qualitative character of polaron localization and significantly broaden the realm of quasi-2D polaron systems.

McKenna, K. P.; Wolf, M. J.; Shluger, A. L.; Lany, S.; Zunger, A.

2012-03-16T23:59:59.000Z

14

Thermal stability of Al- and Zr-doped HfO{sub 2} thin films grown by direct current magnetron sputtering  

SciTech Connect (OSTI)

Ultrathin HfO{sub 2} dielectric films doped with Al and Zr were grown on p-type Si(100) substrates by dc magnetron sputtering, and their microstructural and electrical properties were examined. Compositions and chemical states of the dielectric films were analyzed by Rutherford backscattering spectrometry and x-ray photoelectron spectroscopy. The HfO{sub 2} films doped with Zr were crystallized even from the as-deposited state, however, the crystallization temperature of the HfO{sub 2} film doped with 16% Al{sub 2}O{sub 3} was delayed up to 900 deg. C. As the annealing temperature increases, high-resolution transmission electron microscopy analyses of all doped HfO{sub 2} films showed an increase of the interfacial layer thickness due to the diffusion of small partial pressure of oxygen in annealing ambient. Our results also showed that the addition of Al{sub 2}O{sub 3} to 14% is not useful for blocking the oxygen diffusion through the (HfO{sub 2}){sub 0.86}(Al{sub 2}O{sub 3}){sub 0.14} film. From the capacitance-voltage measurements, the dielectric constants of the Al- and Zr-doped HfO{sub 2} thin films were measured to be 18.7 and 7.6, respectively.

Hong, Yeong-Eui; Kim, Yong-Seok; Do, Kihoon; Lee, Dongwon; Ko, Dae-Hong; Ku, Ja-Hum; Kim, Hyoungsub [Department of Ceramic Engineering, Yonsei University, 134 Shinchon-Dong, Seodaemoon-Ku, Seoul 120-749 (Korea, Republic of); Semiconductor R and D Division, Samsung Electronics Co, Ltd., San no. 24, Nongseo-Ri, Kiheung-Eup, Yongin-City, Kyunggi-Do 449-711 (Korea, Republic of); Department of Advanced Materials Engineering, Sungkyunkwan University, 300 Chunchun-Dong, Jangan-Ku, Suwon 440-746 (Korea, Republic of)

2005-09-15T23:59:59.000Z

15

Activation Volume for Hf Diffusion in an Amorphous Ni0.54Zr0.46 Alloy  

Science Journals Connector (OSTI)

In this Letter we present the results of a diffusion study of Hf in a Ni0.54Zr0.46 amorphous alloy. We have measured the diffusion properties with and without pressure, up to 1 GPa. From these measurements we can deduce an Arrhenius behavior of the diffusion, with an activation energy of 0.76 eV and a pre-exponential factor of 7.4×10-17 m2/s. The activation volume amounts to 8.5 ?3. Activation volume and energy are related by the Keyes relationship. We then discuss to what extent presently proposed diffusion mechanisms, point defects, or collective processes can be tested against these results.

A. Grandjean; P. Blanchard; Y. Limoge

1997-01-27T23:59:59.000Z

16

Temperature dependences of superconducting critical current density and upper critical field for V/sub 2/(Hf,Zr) multifilamentary wire  

SciTech Connect (OSTI)

The temperature dependences of the critical current density, J /SUB c/ , and the upper critical field, uH /SUB c2/ , have been studied for newly developed V/sub 2/(Hf,Zr) multifilamentary wires. At 4.2 K, a ..mu..H /SUB c2/ of 22 T and an overall J /SUB c/ of 1 x 10/sup 4/ A/cm/sup 2/ at 17 T are obtained for these wires. At 1.8 K, overall J /SUB c/ in 15 T of these wires are twice as large as that of the bronze-processed Nb/sub 3/Sn multifilamentary wire. The enhanced J /SUB c/ at reduced temperatures may be attributed to the rapid increase in ..mu..H /SUB c2/ by using the temperature scaling law of the pinning force density. ..mu..H /SUB c2/ measured in pulsed fields is about 28 T at 2.0 K. According to the temperature scaling law, the overall J /SUB c/ for 1.8 K and at 20 T is estimated to be 2 x 10/sup 4/ A/cm/sup 2/. Thus, the present V/sup 2/(Hf,Zr) multifilamentary wires are very promising for use of generating high magnetic fields in the superfluid liquid helium environment.

Inoue, K.; Kuroda, T.; Tachikawa, K.

1985-03-01T23:59:59.000Z

17

Thermal and electronic charge transport in bulk nanostructured Zr{sub 0.25}Hf{sub 0.75}NiSn composites with full-Heusler inclusions  

SciTech Connect (OSTI)

Bulk Zr{sub 0.25}Hf{sub 075}NiSn half-Heusler (HH) nanocomposites containing various mole fractions of full-Heusler (FH) inclusions were prepared by solid state reaction of pre-synthesized HH alloy with elemental Ni at 1073 K. The microstructures of spark plasma sintered specimens of the HH/FH nanocomposites were investigated using transmission electron microscopy and their thermoelectric properties were measured from 300 K to 775 K. The formation of coherent FH inclusions into the HH matrix arises from solid-state Ni diffusion into vacant sites of the HH structure. HH(1-y)/FH(y) composites with mole fraction of FH inclusions below the percolation threshold, y{approx}0.2, show increased electrical conductivity, reduced Seebeck coefficient and increased total thermal conductivity arising from gradual increase in the carrier concentration for composites. A drastic reduction ({approx}55%) in {kappa}{sub l} was observed for the composite with y=0.6 and is attributed to enhanced phonon scattering due to mass fluctuations between FH and HH, and high density of HH/FH interfaces. - Graphical abstract: Large reduction in the lattice thermal conductivity of bulk nanostructured half-Heusler/full-Heusler (Zr{sub 0.25}Hf{sub 075}NiSn/ Zr{sub 0.25}Hf{sub 075}Ni{sub 2}Sn) composites, obtained by solid-state diffusion at 1073 K of elemental Ni into vacant sites of the half-Heusler structure, arising from the formation of regions of spinodally decomposed HH and FH phases with a spatial composition modulation of {approx}2 nm. Highlights: > Bulk composites from solid state transformation of half-Heusler matrix through Ni diffusion. > Formation of coherent phase boundaries between half-Heusler matrix and full-Heusler inclusion. > Alteration of thermal and electronic transports with increasing full-Heusler inclusion. > Enhanced phonon scattering at half-Heusler/ full-Heusler phase boundaries.

Makongo, Julien P.A.; Misra, Dinesh K. [Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Salvador, James R. [Chemical Sciences and Materials Systems Laboratory, General Motors R and D Center, Warren, MI 48090 (United States); Takas, Nathan J. [Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Wang, Guoyu [Department of Physics, University of Michigan, Ann Arbor, MI 48109 (United States); Shabetai, Michael R.; Pant, Aditya; Paudel, Pravin [Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Uher, Ctirad [Department of Physics, University of Michigan, Ann Arbor, MI 48109 (United States); Stokes, Kevin L. [Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Department of Physics, University of New Orleans, New Orleans, LA 70148 (United States); Poudeu, Pierre F.P., E-mail: ppoudeup@umich.edu [Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Department of Chemistry, University of New Orleans, New Orleans, LA 70148 (United States); Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States)

2011-11-15T23:59:59.000Z

18

Exploration of R2XM2 (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge): Structural Motifs, the novel Compound Gd2AlGe2 and Analysis of the U3Si2 and Zr3Al2 Structure Types  

SciTech Connect (OSTI)

In the process of exploring and understanding the influence of crystal structure on the system of compounds with the composition Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} several new compounds were synthesized with different crystal structures, but similar structural features. In Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, the main feature of interest is the magnetocaloric effect (MCE), which allows the material to be useful in magnetic refrigeration applications. The MCE is based on the magnetic interactions of the Gd atoms in the crystal structure, which varies with x (the amount of Si in the compound). The crystal structure of Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} can be thought of as being formed from two 3{sup 2}434 nets of Gd atoms, with additional Gd atoms in the cubic voids and Si/Ge atoms in the trigonal prismatic voids. Attempts were made to substitute nonmagnetic atoms for magnetic Gd using In, Mg and Al. Gd{sub 2}MgGe{sub 2} and Gd{sub 2}InGe{sub 2} both possess the same 3{sup 2}434 nets of Gd atoms as Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, but these nets are connected differently, forming the Mo{sub 2}FeB{sub 2} crystal structure. A search of the literature revealed that compounds with the composition R{sub 2}XM{sub 2} (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge) crystallize in one of four crystal structures: the Mo{sub 2}FeB{sub 2}, Zr{sub 3}Al{sub 2}, Mn{sub 2}AlB{sub 2} and W{sub 2}CoB{sub 2} crystal structures. These crystal structures are described, and the relationships between them are highlighted. Gd{sub 2}AlGe{sub 2} forms an entirely new crystal structure, and the details of its synthesis and characterization are given. Electronic structure calculations are performed to understand the nature of bonding in this compound and how electrons can be accounted for. A series of electronic structure calculations were performed on models with the U{sub 3}Si{sub 2} and Zr{sub 3}Al{sub 2} structures, using Zr and A1 as the building blocks. The starting point for these models was the U{sub 3}Si{sub 2} structure, and models were created to simulate the transition from the idealized U{sub 3}Si{sub 2} structure to the distorted Zr{sub 3}Al{sub 2} structure. Analysis of the band structures of the models has shown that the transition from the U{sub 3}Si{sub 2} structure to the Zr{sub 3}Al{sub 2} structure lifts degeneracies along the {Lambda} {yields} Z direction, indicating a Peierls-type mechanism for the displacement occurring in the positions of the Zr atoms.

Sean William McWhorter

2006-05-01T23:59:59.000Z

19

E-Print Network 3.0 - al hf ta Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

a JEOL electron microprobe and Ca, Ti, Nb, Ta, Hf and Zr abundances measured using laser ablation... for an Al-rich chon- drule. As Figure 1 shows there is little evidence for...

20

Microsoft Word - Ra-15  

Broader source: Energy.gov (indexed) [DOE]

Report Report Review of the Department of Energy's Plan for Obligating Remaining Recovery Act Contract and Grant Funding OAS-RA-10-15 August 2010 Additional Information Special Report on "Review of the Department of Energy's Plan for Obligating Remaining Recovery Act Contract and Grant Funding" OAS-RA-10-15 August 6, 2010 Report OAS-RA-10-15, Review of the Department of Energy's Plan for Obligating Remaining Recovery Act Contract and Grant Funding, was issued to the Secretary and the Department's management on August 4, 2010. On August 5, 2010, the Department announced the award of the so-called "FutureGen 2.0" contract, using $1 billion of American Recovery and Reinvestment Act funding. Despite our request, specific information pertinent to this action was not provided to the Office of

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Ra  

Broader source: Energy.gov (indexed) [DOE]

8, 2001 8, 2001 Office of General Counsel GC-52 U.S. Department of Energy 1000 Independence Ave., S.W. Washington, D.C. 20585 Re: AAR Comments Dear Madam or Sir: Enclosed are five copies of the comments of the Association of American Railroads in response to DOE's invitation to comment on Price-Anderson indemnification (62 Fed. Reg. 68272 (Dec. 31, 1997). Please return the extra copy of this cover letter, date-stamped, in the enclosed stamped, self-addressed envelope to indicate receipt. Thank you. Sincerely, 1 A trade association whose membership includes freight railroads that operate 77 percent of the line-haul mileage, employ 91 percent of the workers, and account for 93 percent of the freight revenue of all railroads in the United States. 2 See 62 Fed. Reg. 68272 (Dec. 31, 1997).

22

Phase selection and transition in Hf-rich hafnia-titania nanolaminates  

SciTech Connect (OSTI)

Hf-rich hafnia-titania nanolaminate films with five HfO{sub 2}-TiO{sub 2} bilayer architectures (0.64 to 0.94 Hf atom fraction) were sputter deposited on unheated fused silica substrates, annealed post-deposition from 573 to 1273 K, and analyzed by x-ray diffraction to study phase selection and transition. Isochronal annealing for 1 h intervals from 573 to 1173 K produces weak crystallization into monoclinic (m) HfO{sub 2} doped with Ti, i.e., m-Hf{sub 1-x}Ti{sub x}O{sub 2}. The amount of Ti incorporated into m-HfO{sub 2} depends upon both architecture and overall stoichiometry, but in all but the coarsest architecture, exceeds the bulk solubility limit of x = 0.05. Initial annealing at 1273 K produces significant crystallization into a biphasic structure, m-Hf{sub 1-x}Ti{sub x}O{sub 2} and orthorhombic (o) HfTiO{sub 4}. From bulk phase equilibrium considerations, o-HfTiO{sub 4} is expected to crystallize under conditions of interfacial bilayer mixing. However, upon further annealing at 1273 K, o-HfTiO{sub 4} proves to be unstable. o-HfTiO{sub 4} demixing inevitably occurs independent of architecture and stoichiometry, resulting in final crystallization products after 96 h at 1273 K that are m-Hf{sub 1-x}Ti{sub x}O{sub 2} with x {approx_equal} 0.05 and TiO{sub 2} doped with Hf. We suggest that o-HfTiO{sub 4} instability arises from a driving force to form domains similar to those found in the low temperature in/commensurate structures of ZrTiO{sub 4}. A detailed crystallographic group-subgroup analysis of the o (Pbcn) {yields} m (P2{sub 1}/c) transition shows that these domains can be represented by an orientation twin in the latter structure and their creation can be achieved by a single step second-order phase transition.

Cisneros-Morales, Massiel Cristina; Rubin Aita, Carolyn

2011-06-15T23:59:59.000Z

23

Characterization of Ceramic Plasma-Sprayed Coatings, and Interaction Studies Between U-Zr Fuel and Ceramic Coated Interface at an Elevated Temperature  

SciTech Connect (OSTI)

Candidate coating materials for re-usable metallic nuclear fuel crucibles, HfN, TiC, ZrC, and Y2O3, were plasma-sprayed onto niobium substrates. The coating microstructure and the thermal cycling behavior were characterized, and U-Zr melt interaction studies carried out. The Y2O3 coating layer had a uniform thickness and was well consolidated with a few small pores scattered throughout. While the HfN coating was not well consolidated with a considerable amount of porosity, but showed somewhat uniform thickness. Thermal cycling tests on the HfN, TiC, ZrC, and Y2O3 coatings showed good cycling characteristics with no interconnected cracks forming even after 20 cycles. Interaction studies done on the coated samples by dipping into a U-20wt.%Zr melt indicated that HfN and Y2O3 did not form significant reaction layers between the melt and the coating while the TiC and the ZrC coatings were significantly degraded. Y2O3 exhibited the most promising performance among HfN, TiC, ZrC, and Y2O3 coatings.

Ki Hwan Kim; Chong Tak Lee; R. S. Fielding; J. R. Kennedy

2011-08-01T23:59:59.000Z

24

eRA Training Team1 Terminations  

E-Print Network [OSTI]

eRA Training Team1 xTrain Terminations Electronic Research Administration Sponsored by: The National Institutes of Health, Office of Extramural Research March 2012 #12;eRA Training Team2 xTrain General Information xTrain Overview The following section provides general information on the xTrain

Baker, Chris I.

25

eRA Training Team1 Terminations  

E-Print Network [OSTI]

eRA Training Team1 xTrain Terminations Electronic Research Administration Sponsored by: The National Institutions of Health, Office of Extramural Research April 2010 #12;eRA Training Team2 xTrain General Information xTrain Overview The following section provides general information on the xTrain

Baker, Chris I.

26

Calculations of Hf -electron affinity and  

E-Print Network [OSTI]

Calculations of Hf - electron affinity and photodetachment partial cross sections Lin Pan. PHYS. B 2009 #12;Calculations of Hf - electron affinity and photodetachment partial cross sections 2 1 the replacements, the subshells that are not occupied in #12;Calculations of Hf - electron affinity

Beck, Donald R.

27

(RA) Gila's Departments (RA) Jena's Departments BK Anesthesiology LN Biomedical Engineering  

E-Print Network [OSTI]

(RA) Gila's Departments (RA) Jena's Departments BK Anesthesiology LN Biomedical Engineering JC Biochemistry & Biophysics JC Biostatistics & Computational Biology BK Biomedical Genetics BK Brain & Cognitive Development & Disease AC Center for Oral Biology LN Center for Primary Care AB Center for Pediatric Biomedical

Mahon, Bradford Z.

28

The ZR Refurbishment Project  

Science Journals Connector (OSTI)

ZR is a refurbished (R) version of Z aiming to improve its overall performance reliability precision pulse shape tailoring and reproducibility. Z the largest pulsed power machine at Sandia began in December 1985 as the Particle Beam Fusion Accelerator II (PBFA II). PBFA II was modified in 1996 to a z?pinch driver by incorporating a high?current (20?MA 2.5?MV) configuration in the inner ? 4.5 meter section. Following its remarkable success as z?pinch driver PBFA II was renamed Z in 1997. Currently Z fires 170 to 180 shots a year with a peak load current of the order of 18–20 MA. The maximum z?pinch output achieved to date is 1.6?MJ 170?TW radiated energy and power from a single 4?cm diameter 2?cm tall array and 215 eV temperature from a dynamic hohlraum. ZR in turn will operating in double shift enable 400 shots per year deliver a peak current of 26 MA into a standard 4cm × 2cm Z?pinch load and should provide a total radiated x?ray energy and power of 3 MJ and 350 TW respectively achieve a maximum hohlraum temperature of 260 eV and include a pulse?shaping flexibility extending from 100ns to 300ns for equation of state and isentropic compression studies. To achieve this performance ZR will incorporate substantial modifications and upgrades to Marx generator intermediate store capacitors gas and water switches water transmission lines and the laser triggering system. Test beds are already in place and the new pulsed power components are undergoing extensive evaluation. The Z refurbishment (ZR) will be operational by 2006 and will cost approximately $60M.

Dillon H. McDaniel; Michael G. Mazarakis; David E. Bliss; Juan M. Elizondo; Henry C. Harjes; Harry C. Ives III; David L. Kitterman; John E. Maenchen; Timothy D. Pointon; Stephen E. Rosenthal; David L. Smith; Kenneth W. Struve; William A. Stygar; Edward A. Weinbrecht; David L. Johnson; John P. Corley

2002-01-01T23:59:59.000Z

29

WAVE-DRIVEN SURFACE FROM HF RADAR  

E-Print Network [OSTI]

experiments using the University of Miami's Ocean Surface Current Radar (OSCR) (Shay et al., 1995, 1997 to the internal wave signals. Observations The HF radar system mapped the coastal ocean currents over a 30 Ã? 45 kmFEATURE INTERNAL CURRENTS WAVE-DRIVEN SURFACE FROM HF RADAR By Lynn K. Shay Observations from

Miami, University of

30

Natural radioactivity of 226Ra and 228Ra in thermal and mineral waters in Croatia  

Science Journals Connector (OSTI)

......and Occupational Health, Radiation Protection...the elements of the uranium and thorium natural...Croatia, with many health resorts based on...detector (partially depleted PIPS detector: active...other elements of the uranium and thorium natural...ingested U and Ra. Health Phys (1985) 48......

Tomislav Bituh; Gordana Marovic; Branko Petrinec; Jasminka Sencar; Iva Franulovic

2009-01-01T23:59:59.000Z

31

Video Production Tips R.A. Nocera  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Video Production Tips Video Production Tips R.A. Nocera There are many elements that contribute to a good video. Much of the work is in pre- production: script, storyboard, props, location, rehearsal, editing. All of these should be refined and ready before production and not interfere with the shooting schedule. I suggest creating a shot schedule of which scenes you are going to film - if you're shooting some scenes indoors and some outdoors, arrange the script in terms of location. This will make production much more efficient. There are many books and online pages about video production for reference. This is the most important aspect of film: SOUND. If you have a brilliant script, good actors, and direction, it will not translate if the sound is inaudible. Here are some ways

32

OAS-RA-12-14  

Broader source: Energy.gov (indexed) [DOE]

Special Report Special Report Inquiry into the Procurement of Law Firm Services and Management of Law Firm-Disclosed Organizational Conflicts of Interest by the Department of Energy's Loan Programs Office OAS-RA-12-14 August 2012 Department of Energy Washington, DC 20585 August 28, 2012 MEMORANDUM FOR THE SECRETARY FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Special Report on "Inquiry into the Procurement of Law Firm Services and Management of Law Firm-Disclosed Organizational Conflicts of Interest by the Department of Energy's Loan Programs Office" BACKGROUND The Department of Energy's Loan Programs Office was created to accelerate the domestic commercial deployment of innovative and advanced clean energy technologies by guaranteeing

33

Acidizing of Sandstone Reservoirs Using HF and Organic Acids  

E-Print Network [OSTI]

Mud acid, which is composed of HCl and HF, is commonly used to remove the formation damage in sandstone reservoirs. However, many problems are associated with HCl, especially at high temperatures. Formic-HF acids have served as an alternative...

Yang, Fei

2012-10-19T23:59:59.000Z

34

Stellar (n,?) cross sections of Hf174 and radioactive Hf182  

Science Journals Connector (OSTI)

The stellar neutron capture cross sections of Hf174 and the radioactive isotope Hf182 (t1/2=8.9×106 yr) have been measured for the first time at kT=25 keV by means of the activation technique. These isotopes originate from different stellar scenarios, Hf174 from the p-process by a series of photodisintegration reactions of heavier seed nuclei, and Hf182 from the s-process in asymptotic giant branch stars as well as from the r-process in supernovae or neutron star mergers. Both activation measurements were carried out at the Karlsruhe Van de Graaff accelerator using the Li7(p,n)Be7 reaction for simulating a Maxwellian neutron spectrum corresponding to a thermal energy of kT=25 keV. The Maxwellian averaged cross sections (MACS) extrapolated to the common s-process temperatures at kT=30 keV yield ???30=983±46 and 141±8 mb for Hf174 and Hf182, respectively.

C. Vockenhuber; I. Dillmann; M. Heil; F. Käppeler; N. Winckler; W. Kutschera; A. Wallner; M. Bichler; S. Dababneh; S. Bisterzo; R. Gallino

2007-01-12T23:59:59.000Z

35

Microbial release of 226Ra2+ from (Ba,Ra)SO4 sludges from uranium mine wastes.  

Science Journals Connector (OSTI)

...overlying water was depleted, Ba2+ and 226Ra2...SO4 sludges from uranium mine wastes...overlying water was depleted, Ba2' and 226Ra2...environment. At many uranium mining and milling...by the National Uranium Tailings Pro- gram...American Public Health Association. 1980...

P M Fedorak; D W Westlake; C Anders; B Kratochvil; N Motkosky; W B Anderson; P M Huck

1986-08-01T23:59:59.000Z

36

Phase transformations in Cu-Zr multilayers  

SciTech Connect (OSTI)

A study of phase transformations is reported for Cu-rich, Cu-Zr multilayer foils synthesized using magnetron sputter deposition and annealed using a differential scanning calorimeter. The foils range in composition from 1.6 to 9.0 at% Zr and consist of alternate layers of polycrystalline Cu and Zr. Differential scanning calorimetry, X-ray analysis and electron microscopy were used to three distinct reactions in the foils: a mixing and an amorphization of the Cu and die Zr, a crystallization on of this amorphous phase to the metastable intermetallic Cu{sub 5l}Zr{sub l4}, and a transformation of the Cu{sub 5l}Zr{sub l4} phase into the equilibrium phase Cu{sub 9}Zr{sub 2}. The as-deposited layering remained stable during the first two reactions and then broke down in the third reaction as large grains of Cu{sub 9}Zr{sub 2} encompassed the smaller Cu grains. Heats of the reactions and activation energies of these reactions are measured and are compared to values reported for bulk samples. The measured heats provide evidence that amorphous Cu-Zr alloys phase separate and that mixing and short range ordering produce 3.5 times more heat than long range ordering produces when Ca and Zr react and form Cu{sub 5l}Zr{sub l4}.

Weihs, T.P.; Barbee, T.W. Jr.; Wall, M.A.

1993-04-01T23:59:59.000Z

37

Electrooptic parameters of the hydrogen bridge in B…HF complexes [B=HF, H2O, (CH3)2NCHO  

Science Journals Connector (OSTI)

The density-functional method [B3LYP/6-31++G(d,p)] is used to calculate molecular associates with various enthalpies of formation: HF…HF, H2O…HF, and...

Yukhnevich, G V; Tsoi, O Yu

2007-01-01T23:59:59.000Z

38

Ra Solar Systems Solutions SL | Open Energy Information  

Open Energy Info (EERE)

Ra Solar Systems Solutions SL Ra Solar Systems Solutions SL Jump to: navigation, search Name Ra Solar Systems & Solutions SL Place Madrid, Spain Zip 28033 Sector Solar Product Spanish project developer and finance arranger for large-scale solar farms; also acts as distributors for complete PV systems and components. Coordinates 40.4203°, -3.705774° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.4203,"lon":-3.705774,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

39

RAPID DETERMINATION OF RA-226 IN ENVIRONMENTAL SAMPLES  

SciTech Connect (OSTI)

A new rapid method for the determination of {sup 226}Ra in environmental samples has been developed at the Savannah River Site Environmental Lab (Aiken, SC, USA) that can be used for emergency response or routine sample analyses. The need for rapid analyses in the event of a Radiological Dispersive Device or Improvised Nuclear Device event is well-known. In addition, the recent accident at Fukushima Nuclear Power Plant in March, 2011 reinforces the need to have rapid analyses for radionuclides in environmental samples in the event of a nuclear accident. {sup 226}Ra (T1/2 = 1,620 years) is one of the most toxic of the long-lived alpha-emitters present in the environment due to its long life and its tendency to concentrate in bones, which increases the internal radiation dose of individuals. The new method to determine {sup 226}Ra in environmental samples utilizes a rapid sodium hydroxide fusion method for solid samples, calcium carbonate precipitation to preconcentrate Ra, and rapid column separation steps to remove interferences. The column separation process uses cation exchange resin to remove large amounts of calcium, Sr Resin to remove barium and Ln Resin as a final purification step to remove {sup 225}Ac and potential interferences. The purified {sup 226}Ra sample test sources are prepared using barium sulfate microprecipitation in the presence of isopropanol for counting by alpha spectrometry. The method showed good chemical recoveries and effective removal of interferences. The determination of {sup 226}Ra in environmental samples can be performed in less than 16 h for vegetation, concrete, brick, soil, and air filter samples with excellent quality for emergency or routine analyses. The sample preparation work takes less than 6 h. {sup 225}Ra (T1/2 = 14.9 day) tracer is used and the {sup 225}Ra progeny {sup 217}At is used to determine chemical yield via alpha spectrometry. The rapid fusion technique is a rugged sample digestion method that ensures that any refractory radium particles are effectively digested. The preconcentration and column separation steps can also be applied to aqueous samples with good results.

Maxwell, S.

2012-01-03T23:59:59.000Z

40

C15 intermetallic compounds HfV{sub 2}+Nb  

SciTech Connect (OSTI)

Phase fields and equilibria in the Hf-V-Nb system were determined using a combination-of SEM, EDS and x-ray diffraction. The structural stability of the C15 HfV{sub 2+}Nb was studied by x-ray diffraction and specific heat measurements. The elastic constants of C15 HfV{sub 2+}Nb were measured by the resonant ultrasound spectroscopy technique. First-principle quantum mechanical calculations based on the local-density-functional theory have been employed to study the total energy and electronic structure of C15 HfV{sub 2}, which can be used to understand the physical and metallurgical properties of the C15 intermetallics HfV{sub 2+}Nb.

Chu, F.; Chen, S.P.; Mitchell, T.E. [Los Alamos National Lab., NM (United States); Pope, D.P. [Pennsylvania Univ., Philadelphia, PA (United States). Dept. of Materials Science and Engineering; Liu, C.T. [Oak Ridge National Lab., TN (United States)

1994-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Observation of the negative ions: Ra-, Pa-, and Pu-  

Science Journals Connector (OSTI)

The negative ions of the isotopes Ra226, Pa231, and Pu244 have been observed by means of accelerator mass spectrometry and their properties compared with the negative ions of Th and U. The electron affinities of all these elements have been estimated to be similar and greater than 50 meV.

X.-L. Zhao; M.-J. Nadeau; M. A. Garwan; L. R. Kilius; A. E. Litherland

1993-11-01T23:59:59.000Z

42

Audit Report: OAS-RA-12-06 | Department of Energy  

Energy Savers [EERE]

RA-12-06 Audit Report: OAS-RA-12-06 February 22, 2012 The Management of Post-Recovery Act Workforce Transition at Office of Environmental Management Sites We conducted an audit to...

43

Audit Report: OAS-RA-10-05 | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

OAS-RA-10-05 Audit Report: OAS-RA-10-05 March 25, 2010 Management Controls over the Department's WinSAGA System for Energy Grants Management Under the Recovery Act As a result of...

44

Audit Report: OAS-RA-L-13-01 | Department of Energy  

Energy Savers [EERE]

RA-L-13-01 Audit Report: OAS-RA-L-13-01 November 1, 2012 Implementation of the Department of Energy's Concentrating Solar Power Program The Department of Energy's (Department)...

45

Theoretical Assessment of 178m2Hf De-Excitation  

SciTech Connect (OSTI)

This document contains a comprehensive literature review in support of the theoretical assessment of the {sup 178m2}Hf de-excitation, as well as a rigorous description of controlled energy release from an isomeric nuclear state.

Hartouni, E P; Chen, M; Descalle, M A; Escher, J E; Loshak, A; Navratil, P; Ormand, W E; Pruet, J; Thompson, I J; Wang, T F

2008-10-06T23:59:59.000Z

46

Bremsstrahlung emission during $?$-decay of $^{226}{\\rm Ra}$  

E-Print Network [OSTI]

We obtained the spectrum of probability of the bremsstrahlung emission accompanying the $\\alpha$-decay of $^{226}{\\rm Ra}$ (E$_{\\alpha}$=4.8 MeV) by measuring the $\\alpha$-$\\gamma$ coincidences and using the model presented in our previous study on the $\\alpha-$decay of $^{214}{\\rm Po}$ (E$_{\\alpha}$=7.7 MeV). We compare the experimental data with the quantum mechanical calculation and find a good agreement between theory and experiment. We discuss the differences between the photon spectra connected with the $\\alpha$-decay of the $^{226}{\\rm Ra}$ and $^{214}{\\rm Po}$ nuclei. For the two mentioned nuclei we analyze the bremsstrahlung emission contributions from the tunneling and external regions of the nucleus barrier into the total spectrum, and we find the destructive interference between these contributions. We also find that the emission of photons during tunneling of the $\\alpha$-particle gives an important contribution to the bremsstrahlung spectrum in the whole E$_{\\gamma}$ energy range of the studied $^{226}$Ra nucleus.

Giorgio Giardina; Giovanni Fazio; Giuseppe Mandaglio; Marina Manganaro; Serghei P. Maydanyuk; Vladislav S. Olkhovsky; Nikolay V. Eremin; Anton A. Paskhalov; Dmitry A. Smirnov; Carmelo Sacca

2008-04-16T23:59:59.000Z

47

Ra223 levels fed in the Fr223 ? decay  

Science Journals Connector (OSTI)

The Fr223 ? decay was reinvestigated using high-resolution single ? spectrometry as well as ?-? coincidence techniques. For single ?-spectra measurements, radiochemically pure Fr223 sources were obtained by chromatographic separation from a 75 MBq activity Ac227 parent source and continuously purified of Ra223 and daughters. The analysis of the ? spectra of 30 sources showed the existence of 131 ? lines, of which 87 are reported for the first time in the Fr223 ? decay although many of them are observed following the Th227 ? decay. The Fr223 half-life was remeasured and found to be T1/2=22.00±0.07 min. ?-?-t coincidence measurements were also carried out with Fr223 purified sources. The Ra223 level scheme was built on the basis of our ? data, as well as Th227 ?-decay data. Among the 32 excited Ra223 levels, of which 22 were also known from Th227 ? decay, 13 are newly reported from Fr223 ? decay. Low energy levels (E<400 keV) may be classified as parity doublet bands according to the predictions of the reflection asymmetric rotor model. Above a 700 keV gap, a coexistence of symmetric and asymmetric shapes including both static and dynamic octupole correlations is suggested.

A. Abdul-Hadi; V. Barci; B. Weiss; H. Maria; G. Ardisson; M. Hussonnois; O. Constantinescu

1993-01-01T23:59:59.000Z

48

Growth of HfO{sub 2} films using an alternate reaction of HfCl{sub 4} and O{sub 2} under atmospheric pressure  

SciTech Connect (OSTI)

HfO{sub 2} films were deposited onto a Si(100) substrate using an alternate reaction of HfCl{sub 4} and O{sub 2} under atmospheric pressure. Self-limiting growth of the HfO{sub 2} was achieved in the range of the growth temperature above 873K. The X-ray diffraction of the HfO{sub 2} films showed a typical diffraction pattern assigned to the monoclinic polycrystalline phase. Residual chloride concentration in HfO{sub 2} films were not higher than 0.1at%. When the growth temperature was 973K, the HfSiO{sub x} is formed in HfO{sub 2} film. This gives effective permittivity value of 9.6 for the HfO{sub 2} film grown at 573K.

Takahashi, Naoyuki [Department of Materials Science and Technology, Faculty of Engineering Shizuoka University, 3-5-1 Johoku, Hamamatu, Shizuoka 432-8561 (Japan)]. E-mail: tntakah@ipc.shizuoka.ac.jp; Nonobe, Shinichi [Department of Materials Science and Technology, Faculty of Engineering Shizuoka University, 3-5-1 Johoku, Hamamatu, Shizuoka 432-8561 (Japan); Nakamura, Takato [Department of Materials Science and Technology, Faculty of Engineering Shizuoka University, 3-5-1 Johoku, Hamamatu, Shizuoka 432-8561 (Japan)

2004-11-01T23:59:59.000Z

49

Superlattice Structure and Precipitates in O+ and Zr+ Ion Coimplanted...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Zr+ Ion Coimplanted SrTiO3: a Model Waste Form for 90Sr. Abstract: We investigate strontium titanate as a model waste form for 90Sr. Implantation with O+ and Zr+ ions, followed...

50

Growth mechanism difference of sputtered HfO{sub 2} on Ge and on Si  

SciTech Connect (OSTI)

HfO{sub 2} films were deposited by the reactive sputtering on Ge and Si substrates simultaneously, and we found both the interface layer and the HfO{sub 2} film were thinner on Ge substrate than those on Si substrate. A metallic Hf layer has a crucial role for the thickness differences of both interface layer and HfO{sub 2} film, since those thickness differences were observed only when an ultrathin metallic Hf layer was predeposited before the reactive sputtering process. The role of metallic Hf in these phenomena is understandable by assuming the formation of a volatile Hf-Ge-O ternary compound at the early stage of the film growth. This result shows that the HfO{sub 2}/Ge system has an advantage over the HfO{sub 2}/Si system from the viewpoint of further reduction of the gate oxide film thickness.

Kita, Koji; Kyuno, Kentaro; Toriumi, Akira [Department of Materials Science, School of Engineering, University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)

2004-07-05T23:59:59.000Z

51

Early (4.5 Ga) formation of terrestrial crust: LuHf, 18 thermometry results for Hadean zircons  

E-Print Network [OSTI]

the characterization of 176 Hf/177 Hf initial ratios (Hf ) in Hadean zircons by acquiring a further 116 laser ablationEarly (4.5 Ga) formation of terrestrial crust: Lu­Hf, 18 O, and Ti thermometry results for Hadean Editor: R.W. Carlson Available online 19 February 2008 Abstract Large deviations in Hf(T) from bulk

Harrison, Mark

52

Determination of dynamic fracture parameters for HF?1 steel  

Science Journals Connector (OSTI)

Dynamic fracture parameters have been determined for two heat treatments of HF?1 steel. A gas gun was used for the experiments. Different amounts of fracture damage were produced in HF?1 steel specimens under known impact conditions. The specimens were soft recovered sectioned and polished to reveal any internal microscopic fracture. The fracturecracks were then digitized. The velocities of the 1.15? 1.59? and 2.37?mm?thick impactor disks range from 0.120 to 0.276 km/s. The specimen disks were 3.18? and 6.35?mm thick. An SRI stress wave propagationcomputer program with a brittlefracturemodel was used for calculating the dynamic fracture parameters. A series of Hugoniot experiments was performed for HF?1 steel to determine equation of state input data for the computer program. The Hugoniot elastic limits were 2.2 and 2.4 GPa for the two heat treatments.

Willis Mock Jr.; William H. Holt

1982-01-01T23:59:59.000Z

53

Electrochemical Conversion of Oxide Precursors to Consolidated Zr and Zr?2.5Nb Tubes  

Science Journals Connector (OSTI)

Electrochemical Conversion of Oxide Precursors to Consolidated Zr and Zr?2.5Nb ... Electrochemical reduction of tubular oxide precursors in molten calcium chloride and the subsequent in situ consolidation induced by electro-deoxygenation promise a low energy and fast route for manufacturing of zirconium-alloy-based artifacts, such as the nuclear fuel cladding tubes. ... Zircaloy) in a mold of Plaster of Paris. ...

Junjun Peng; Kai Jiang; Wei Xiao; Dihua Wang; Xianbo Jin; George Z. Chen

2008-11-11T23:59:59.000Z

54

Status of the ADMX and ADMX-HF experiments  

E-Print Network [OSTI]

The Axion Dark Matter eXperiment (ADMX) is in the midst of an upgrade to reduce its system noise temperature. ADMX-HF (High Frequency) is a second platform specifically designed for higher mass axions and will serve as an innovation test-bed. Both will be commissioning in 2013 and taking data shortly thereafter. The principle of the experiment, current experimental limits and the status of the ADMX/ADMX-HF program will be described. R&D on hybrid superconducting cavities will be discussed as one example of an innovation to greatly enhance sensitivity.

Karl van Bibber; Gianpaolo Carosi

2013-04-29T23:59:59.000Z

55

Status of the ADMX and ADMX-HF experiments  

E-Print Network [OSTI]

The Axion Dark Matter eXperiment (ADMX) is in the midst of an upgrade to reduce its system noise temperature. ADMX-HF (High Frequency) is a second platform specifically designed for higher mass axions and will serve as an innovation test-bed. Both will be commissioning in 2013 and taking data shortly thereafter. The principle of the experiment, current experimental limits and the status of the ADMX/ADMX-HF program will be described. R&D on hybrid superconducting cavities will be discussed as one example of an innovation to greatly enhance sensitivity.

van Bibber, Karl

2013-01-01T23:59:59.000Z

56

Oscillator strengths for Zr I and Zr II and a new determination of the solar abundance of zirconium  

SciTech Connect (OSTI)

A new determination of the solar abundance of zirconium has been made using equivalent-width data measured on the Jungfraujoch solar atlas together with new oscillator strengths derived from measurements of atomic lifetimes and branching ratios for 34 lines of Zr I and 24 lines of Zr II. Excellent agreement is found between the results derived from Zr I and Zr II lines and also with recent meteoritic results. The mean abundance of zirconium in the Sun is found to be A/sub Zr/ = 2.56 +- 0.05.

Biemont, E.; Grevesse, N.; Hannaford, P.; Lowe, R.M.

1981-09-01T23:59:59.000Z

57

Audit Report: OAS-RA-11-04 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Report: OAS-RA-11-04 February 1, 2011 The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act for the Capital Area...

58

The Advanced Research Projects, OAS-RA-11-11  

Broader source: Energy.gov (indexed) [DOE]

Audit Report Audit Report The Advanced Research Projects Agency - Energy OAS-RA-11-11 August 2011 Department of Energy Washington, DC 20585 August 22, 2011 MEMORANDUM FOR THE DIRECTOR, ADVANCED RESEARCH PROJECTS AGENCY - ENERGY FROM: George W. Collard Assistant Inspector General for Audits Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Advanced Research Projects Agency - Energy" BACKGROUND The Advanced Research Projects Agency - Energy (ARPA-E), an agency within the Department of Energy, was authorized in 2007 as part of the America COMPETES Act (COMPETES Act). The goals of ARPA-E are to enhance domestic economic security through the development of energy technologies and to ensure that the United States maintains a technological lead in

59

Effect of Al addition on the microstructure and electronic structure of HfO2 film  

E-Print Network [OSTI]

Effect of Al addition on the microstructure and electronic structure of HfO2 film X. F. Wang investigated the microstructures and electronic structures of a series of hafnium aluminate HfAlO films with Al concentration ranging from 0% to 100%. When the films evolve from pure HfO2 to pure Al2O3 by increasing

Gong, Xingao

60

Copper diffusion in single-crystal ?-Zr  

Science Journals Connector (OSTI)

Tracer diffusion of Cu64 in ?-Zr single crystals has been measured in the temperature range (615-860)°C. The temperature dependences of the Cu64 diffusion coefficients in directions parallel to and perpendicular to the c axis are given by D?=0.40e-1.54 eVkT and D?=0.25e-1.60 eVkT cm2/sec, respectively. The results are discussed in terms of an interstitial diffusion mechanism.

G. M. Hood and R. J. Schultz

1975-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

A correlation between soil descriptions and {sup 226}Ra concentrations in Florida soils  

SciTech Connect (OSTI)

The soil radium content in Florida is highly variable. The range in radium concentrations, where the samples involved in this study are concerned, is from 0.1 pCi/g to 18.5 pCi/g. Low {sup 226}Ra concentrations (0.1 to 5 pCi/g) are evidenced in sands, moderate concentrations (5 to 11 pCi/g) are found in silt and gravel, and high {sup 226}Ra concentrations (>11 pCi/g) are found in soil horizons with shell, clay, and strata with phosphate. Strata containing phosphate yields a high concentration of {sup 226}Ra. The information obtained in this study, soil descriptions with their corresponding {sup 226}Ra concentrations, comes from geological cores drilled by geotechnical consultants with gamma spectrometry analysis performed by high resolution gamma spectroscopy. Concentration; of {sup 226}Ra generally increase with depth. These cores are usually terminated at 20 feet deep, with some cores being shallower than this due to hitting bedrock or encountering the water table. These frequency distributions give the core-logging geologist an approximate concentration of {sup 226}Ra based on the description of the soil. Since the correlation of {sup 226}Ra and soil descriptions can be used as a tool in assigning indoor radon potential, this study is of importance to land managers, contractors, developers, and regulating agencies who are attempting to place standards on tracts of land with {sup 226}Ra concentration used as a criterion.

Harrison, D.P.

1992-12-31T23:59:59.000Z

62

Estimation of radiation doses to members of the public in Italy from intakes of some important naturally occurring radionuclides (238U, 234U, 235U, 226Ra, 228Ra, 224Ra and 210Po) in drinking water  

Science Journals Connector (OSTI)

The radiological quality in some samples of drinking water collected in Italy has been evaluated in the paper. As far as the measured ? or ? radionuclides are concerned, the doses for all the analysed samples of drinking water are in the range of 1.80–36.2 ?Sv yr?1, all being well below the reference level of the committed effective dose (100 ?Sv yr?1) recommended by the WHO. As far as each measured ? or ? radionuclide is concerned, the dose contributions for most of the analysed water samples are in this order: 210Po>228Ra>226Ra>234U>238U>224Ra>235U, and 210Po and 228Ra can yield a significant contribution to the doses from the analysed drinking water samples. As far as the elements are concerned, the dose contributions are 48.0±27.9% from radium, 31.7±23.1% from polonium, and 20.3±14.1% from uranium. The water samples, No. 2, 7, 13, and 15, can lead to a dose of >10 ?Sv yr?1, mainly due to the dose contribution from 210Po and 228Ra, especially water samples No. 2 and 13. The obtained data can provide basic information for consumers and competent authorities regarding the internal exposure risk due to drinking water intake, and can possibly serve as a comparison when evaluating the dose contribution from artificial radionuclides released to the environment as a result of any human practices and accidents in the studied area.

Guogang Jia; Giancarlo Torri

2007-01-01T23:59:59.000Z

63

Bond formation at the Ni/ZrO2 interface  

Science Journals Connector (OSTI)

We report on the formation of strong chemical bonds at the Ni(100)/cubic-ZrO2(100) polar interfaces. Ab initio density functional theory calculations demonstrate that both Zr/Ni and O/Ni junctions are energetically stable, and predict that two different interactions determine the interface adhesion. Our results reveal that O-Ni ionic bonds are formed by Ni electron donation, while the Zr-Ni bonds show a mixed character with ionic and electron hybridization contributions.

J. I. Beltrán; S. Gallego; J. Cerdá; J. S. Moya; M. C. Muñoz

2003-08-07T23:59:59.000Z

64

Octupole deformation and Ra puzzle in reflection asymmetric covariant density functional theory  

E-Print Network [OSTI]

Reflection asymmetric covariant density functional theory(CDFT) based on the point-coupling interaction is established on a two-center harmonic-oscillator basis and applied to investigate the Ra puzzle, i.e., the anomalous enhancement of the residual proton-neutron interactions for Ra isotopes around N=135. The octupole deformation and shape evolution in the Ra and Rn isotopes are examined in the potential energy surfaces in(beta2, beta3) plane by the constrained reflection asymmetric calculations. The residual proton-neutron interactions extracted from the double difference of the binding energies for Ra isotopes are compared with the data as well as the axial and the triaxial calculations. It is found that the octupole deformation is responsible for the Ra puzzle in the microscopic CDFT.

L. F. Yu; P. W. Zhao; S. Q. Zhang; J. Meng

2012-11-03T23:59:59.000Z

65

Intrinsic metastability of orthorhombic HfTiO{sub 4} in thin film hafnia-titania  

SciTech Connect (OSTI)

Orthorhombic (o) HfTiO{sub 4} is crystallized when sputter deposited hafnia-titania nanolaminates with ultrathin layers and bilayer (HfO{sub 2}){sub 0.5}(TiO{sub 2}){sub 0.5} composition are annealed between 573 and 1173 K. However, o-HfTiO{sub 4} demixes after annealing at 1273 K, a result not predicted from bulk thermodynamics. X-ray diffraction and Raman microscopy are used here to study structural changes as o-HfTiO{sub 4} demixes upon long-term annealing at 1273 K into Ti-doped monoclinic HfO{sub 2} and Hf-doped rutile TiO{sub 2}. We conclude that o-HfTiO{sub 4} crystallized at low temperature is intrinsically metastable. A space group symmetry analysis shows that demixing can be accomplished by a continuous phase transition chain.

Cisneros-Morales, Massiel Cristina; Aita, Carolyn Rubin [Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

2011-01-31T23:59:59.000Z

66

Comparison of the Ca+HF(DF) and Sr+HF(DF) reaction dynamics Rong Zhang, David J. Rakestraw,a) Kenneth G. McKendrick,b) and Richard N. Zare  

E-Print Network [OSTI]

Comparison of the Ca+HF(DF) and Sr+HF(DF) reaction dynamics Rong Zhang, David J. Rakestraw family, Ca and Sr with rovibrationally selected HF or DF, has been carried out under single-collision conditions. A thermal beam of the alkaline earth atoms, Ca or Sr, is fired into a low-pressure gas of HF

Zare, Richard N.

67

Growth, microstructure and electrical properties of sputter-deposited hafnium oxide (HfO2) thin films grown using HfO2 ceramic target  

SciTech Connect (OSTI)

Hafnium oxide (HfO?) thin films have been made by radio-frequency (rf) magnetron-sputtering onto Si(100) substrates under varying growth temperature (Ts). HfO? ceramic target has been employed for sputtering while varying the Ts from room temperature to 500?C during deposition. The effect of Ts on the growth and microstructure of deposited HfO? films has been studied using grazing incidence x-ray diffraction (GIXRD), X-ray photoelectron spectroscopy (XPS), and high-resolution scanning electron microscopy (HR-SEM) coupled with energy dispersive x-ray spectrometry (EDS). The results indicate that the effect of Ts is significant on the growth, surface and interface structure, morphology and chemical composition of the HfO? films. Structural characterization indicates that the HfO? films grown at Ts<200 ?C are amorphous while films grown at Ts>200 ?C are nanocrystalline. An amorphous-to-crystalline transition occurs at Ts=200 ?C. Nanocrystalline HfO? films crystallized in a monoclinic structure with a (-111) orientation. XPS measurements indicated the high surface-chemical quality and stoichiometric nature of the grown HfO? films. An interface layer (IL) formation occurs due to reaction at the HfO?-Si interface for HfO? films deposited at Ts>200 ?C. The thickness of IL increases with increasing Ts. XPS and EDS at the HfO?-Si cross-section indicate the IL is a (Hf, Si)-O compound. The electrical characterization using capacitance-voltage measurements indicate that the dielectric constant decreases from 25 to 16 with increasing Ts.

Aguirre, B.; Vemuri, R. S.; Zubia, David; Engelhard, Mark H.; Shutthanandan, V.; Kamala Bharathi, K.; Ramana, Chintalapalle V.

2011-01-01T23:59:59.000Z

68

Use of GPS network data for HF Doppler measurements interpretation  

E-Print Network [OSTI]

The method of measurement of Doppler frequency shift of ionospheric signal - HF Doppler technique - is one of well-known and widely used methods of ionosphere research. It allows to research various disturbances in the ionosphere. There are some sources of disturbances in the ionosphere. These are geomagnetic storms, solar flashes, metrological effects, atmospheric waves. This method allows to find out the influence of earthquakes, explosions and other processes on the ionosphere, which occur near to the Earth. HF Doppler technique has the high sensitivity to small frequency variations and the high time resolution, but interpretation of results is difficult. In this work we make an attempt to use GPS data for Doppler measurements interpretation. Modeling of Doppler frequency shift variations with use of TEC allows to separate ionosphere disturbances of medium scale.

Petrova, Inna R; Latypov, Ruslan R

2014-01-01T23:59:59.000Z

69

CMS HF calorimeter PMTs and Xi(c)+ lifetime measurement  

SciTech Connect (OSTI)

This thesis consists of two parts: In the first part we describe the Photomultiplier Tube (PMT) selection and testing processes for the Hadronic Forward (HF) calorimeter of the CMS, a Large Hadron Collier (LHC) experiment at CERN. We report the evaluation process of the candidate PMTs from three different manufacturers, the complete tests performed on the 2300 Hamamatsu PMTs which will be used in the HF calorimeter, and the details of the PMT Test Station that is in University of Iowa CMS Laboratories. In the second part we report the {Xi}{sub c}{sup +} lifetime measurement from SELEX, the charm hadro-production experiment at Fermilab. Based upon 301 {+-} 31 events from three di.erent decay channels, by using the binned maximum likelihood technique, we observe the lifetime of {Xi}{sub c}{sup +} as 427 {+-} 31 {+-} 13 fs.

Akgun, Ugur; /Iowa U.

2003-12-01T23:59:59.000Z

70

Background Characterization for Thermal Ion Release Experiments with 224Ra  

SciTech Connect (OSTI)

The Enriched Xenon Observatory for neutrinoless double beta decay uses {sup 136}Ba identification as a means for verifying the decay's occurrence in {sup 136}Xe. A current challenge is the release of Ba ions from the Ba extraction probe, and one possible solution is to heat the probe to high temperatures to release the ions. The investigation of this method requires a characterization of the alpha decay background in our test apparatus, which uses a {sup 228}Th source that produces {sup 224}Ra daughters, the ionization energies of which are similar to those of Ba. For this purpose, we ran a background count with our apparatus maintained at a vacuum, and then three counts with the apparatus filled with Xe gas. We were able to match up our alpha spectrum in vacuum with the known decay scheme of {sup 228}Th, while the spectrum in xenon gas had too many unresolved ambiguities for an accurate characterization. We also found that the alpha decays occurred at a near-zero rate both in vacuum and in xenon gas, which indicates that the rate was determined by {sup 228}Th decays. With these background measurements, we can in the future make a more accurate measurement of the temperature dependency of the ratio of ions to neutral atoms released from the hot surface of the probe, which may lead to a successful method of Ba ion release.

Kwong, H.; /Stanford U., Phys. Dept.; Rowson, P.; /SLAC

2005-12-15T23:59:59.000Z

71

Study of the distribution of 226Ra in ground water near the uranium industry of Jharkhand, India  

Science Journals Connector (OSTI)

......levels of 226Ra observed in the ground water. Being a mineralised area, variation...226Ra activity concentration in ground water that is used for drinking purpose...Cretescu I. Characterisation and remediation of soils contaminated with uranium......

R. M. Tripathi; V. N. Jha; S. K. Sahoo; N. K. Sethy; A. K. Shukla; V. D. Puranik; H. S. Kushwaha

2012-01-01T23:59:59.000Z

72

Metrological Determination of Natural Radioactive Isotopes {sup 226}Ra, {sup 228}Ra and {sup 210}Pb by Means of Ge Detector  

SciTech Connect (OSTI)

A metrological method to determine the activity per mass unity (activity concentration) of {sup 226}Ra and {sup 210}Pb ({sup 238}U decay series) and {sup 228}Ra ({sup 232}Th series) by gamma-ray spectrometers based on hyper-pure coaxial germanium detector was developed. In the soil the {sup 22}Ra (half-life = 1600 years) exhibits the same level of radioactivity as {sup 238}U (half-life 4.5x10{sup 9} years) because of a natural phenomenon called secular equilibrium. {sup 226}Ra decays into {sup 222}Rn (half-life = 3.8 days), a radioactive inert gas. After several days, the {sup 222}Rn naturally decays to {sup 218}Po (half-life = 3 minutes), where finally {sup 210}Pb (half-life = 22 years) is produced. The metrological capability of high-resolution gamma-ray spectrometry for naturally occurring radionuclides at environmental levels is showed, with emphasis on the use of 2 mL standard sources volume in a glass ampoule. Source preparation and calibration procedures are described. Radionuclide standards in an activity range of 10 to 250 Bq/g were produced which can be applied in a variety of environmental sample analysis (water, plant material, sediment, etc.). Uncertainties for {sup 226}Ra and {sup 210}Pb around 3% (k = 1) were obtained.

Almeida, Maria Candida M. de; Delgado, Jose U.; Poledna, Roberto; Oliveira, Estela Maria de; Silva, Ronaldo L. da [Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, Instituto de Radioprotecao e Dosimetria, Comissao Nacional de Energia Nuclear(SEMRA/LNMRI/IRD/CNEN) Av. Salvador Allende s/n, Recreio, Rio de Janeiro, CEP 22780-160, RJ (Brazil)

2008-08-07T23:59:59.000Z

73

List of Topics for Interagency Performance & Risk Assessment Community of Practice (P&RA CoP) Discussion  

Broader source: Energy.gov [DOE]

List of Topics for Interagency Performance & Risk Assessment Community of Practice (P&RA CoP) Discussion

74

Experimental and theoretical study of the (n,2n) reaction on 174,176Hf isotopes  

Science Journals Connector (OSTI)

Cross sections for the 174Hf(n,2n)173Hf and 176Hf(n,2n)175Hf reactions have been measured on the 5.5-MV Van de Graaff tandem accelerator of National Centre for Scientific Research “Demokritos” in Athens, in the neutron energy region from 8.8 to 11.0 MeV, using the activation technique. An experimental method to account for the contamination of the 176Hf(n,2n) reaction by the 174Hf(n,?) reaction activated by the parasitic neutrons of the beam is presented. Statistical model calculations have also been performed using the nuclear-reaction codes empire-ii and talys. The results and effects of the nuclear input parameters as well as pre-equilibrium emission are discussed in detail.

M. Serris; M. Diakaki; S. Galanopoulos; M. Kokkoris; M. Lamprou; C. T. Papadopoulos; R. Vlastou; P. Demetriou; C. A. Kalfas; A. Lagoyannis

2012-09-07T23:59:59.000Z

75

Examination Report: OAS-RA-13-03 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Examination Report: OAS-RA-13-03 » Examination Report: Examination Report: OAS-RA-13-03 » Examination Report: OAS-RA-13-03 Examination Report: OAS-RA-13-03 October 17, 2012 Community Action Partnership of Orange County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of California received $186 million in Recovery Act Weatherization Program funding, of which $7.3 million was allocated to the Community Action Partnership of Orange County (Agency) to weatherize 2,342 homes. The State of California Department of

76

Audit Report: OAS-RA-11-09 | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

9 Audit Report: OAS-RA-11-09 June 13, 2011 The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of West...

77

Audit Report: OAS-RA-10-13 | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

OAS-RA-10-13 June 11, 2010 The Department of Energy's Use of the Weatherization Assistance Program Formula for Allocating Funds under the American Recovery and Reinvestment...

78

Audit Report: OAS-RA-11-14 | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Audit Report: OAS-RA-11-14 August 25, 2011 The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the Commonwealth...

79

Audit Report: OAS-RA-11-13 | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Audit Report: OAS-RA-11-13 August 23, 2011 The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act in the State of...

80

Examination Report: OAS-RA-13-01 | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

1 Examination Report: OAS-RA-13-01 October 9, 2012 California Energy Commission - Energy Efficiency and Conservation Block Grant Program Funds Provided by the American Recovery and...

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Audit Report: OAS-RA-10-17 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

7 Audit Report: OAS-RA-10-17 September 21, 2010 Status Report: The Department of Energy's State Energy Program Formula Grants Awarded under the American Recovery and Reinvestment...

82

Audit Report: OAS-RA-09-04 | Department of Energy  

Energy Savers [EERE]

09-04 Audit Report: OAS-RA-09-04 September 4, 2009 Department of Energy's Efforts to Meet Accountability and Performance Reporting Objectives of the American Recovery and...

83

Audit Report: OAS-RA-10-18 | Department of Energy  

Energy Savers [EERE]

8 Audit Report: OAS-RA-10-18 September 29, 2010 Management Controls over the Department of Energy's American Recovery and Reinvestment Act - Michigan State Energy Program The...

84

Audit Report: OAS-RA-10-16 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Report: OAS-RA-10-16 August 11, 2010 The Department of Energy's Implementation of the Energy Efficiency and Conservation Block Grant Program under the Recovery and Reinvestment...

85

Special Report: OAS-RA-10-15 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Special Report: OAS-RA-10-15 Special Report: OAS-RA-10-15 Special Report: OAS-RA-10-15 August 4, 2010 Review of the Department of Energy's Plan for Obligating Remaining Recovery Act Contract and Grant Funding Report OAS-RA-10-15, Review of the Department of Energy's Plan for Obligating Remaining Recovery Act Contract and Grant Funding, was issued to the Secretary and the Department's management on August 4, 2010. On August 5, 2010, the Department announced the award of the so-called "FutureGen 2.0" contract, using $1 billion of American Recovery and Reinvestment Act funding. Despite our request, specific information pertinent to this action was not provided to the Office of Inspector General prior to release of the audit report. These circumstances are described on page 4 of the report in

86

Audit Report: OAS-RA-14-04 | Department of Energy  

Energy Savers [EERE]

OAS-RA-14-04 June 17, 2014 Selected Activities of the Office of Energy Efficiency and Renewable Energy's Advanced Manufacturing Office The Department of Energy's Office of Energy...

87

UNITED STATE% ENGINEER OFFICE I" RaCLI MANHATTAN D' ISTRICT  

Office of Legacy Management (LM)

A-; . - .-.. w-1 - ,.. P..*e ,e.arzUE.m -JuTm-&a- . . . UNITED STATE% ENGINEER OFFICE I" RaCLI MANHATTAN D' ISTRICT RLFSR TO ; I. 0. eox a ,. STATJON J N E W YORK, N....

88

R.A. Jansen AST 598/494 'The Distant Universe' course, ASU, Fall 2014  

E-Print Network [OSTI]

R.A. Jansen AST 598/494 'The Distant Universe' course, ASU, Fall 2014 Basics of CCDs lecture): http://www.public.asu.edu/rjansen/ast598/ast598 jansen2014.pdf Further reading: 2 An e on the workings of a CCD is: MacKay, C.D. 1986, ARA&A 24, 255. c 2006,2013,2014 R.A. Jansen 1 #12;Introduction

Jansen, Rolf Arthur

89

Crystal phase transition of HfO2 films evaporated by plasma-ion-assisted deposition  

Science Journals Connector (OSTI)

HfO2 is a well-known high-refractive-index material for optical interference coatings from the infrared down to the ultraviolet

Wang, Jue; Maier, Robert L; Schreiber, Horst

2008-01-01T23:59:59.000Z

90

Crystal Phase Transition of HfO2 Films Evaporated by Plasma Ion-Assisted Deposition  

Science Journals Connector (OSTI)

HfO2 films were evaluated by spectroscopic ellipsometry, indicating crystal phase transition due to plasma ion momentum transfer during deposition. The film inhomogeneity,...

Wang, Jue; Maier, Robert L; Schreiber, Horst

91

Reduced-temperature processing and consolidation of ultra-refractory Ta4HfC5  

SciTech Connect (OSTI)

TaC, HfC, and WC powders were subjected to high-energy milling and hot pressing to produce Ta4HfC5, a composite of Ta(4)HfC5 + 30 vol.% WC, and a composite of Ta4HfC5 + 50 vol.% WC. Sub-micron powders were examined after four different milling intervals prior to hot pressing. XRD was used to verify proper phase formation. SEM, relative density, and hardness measurements were used to examine the resulting phases. Hot pressed compacts of Ta4HfC5 showed densification as high as 98.6% along with Vickers hardness values of 21.4 GPa. Similarly, Ta4HfC5 + 30 vol.% WC exhibited 99% densification with a Vickers hardness of 22.5 GPa. These levels of densification were achieved at 1500 degrees C, which is lower than any previously reported sintering temperature for Ta4HfC5. Microhardness values measured in this study were higher than those previously reported for Ta4HfC5. The WC additions to Ta4HfC5 were found to improve densification and increase microhardness. (C) 2013 Elsevier Ltd. All rights reserved.

Gaballa, Osama [Ames Laboratory; Cook, B. A. [TRI International; Russell, A. M. [Ames Laboratory

2013-04-26T23:59:59.000Z

92

ccsd00001055 First principles study of the solubility of Zr in Al  

E-Print Network [OSTI]

ccsd­00001055 (version 1) : 22 Jan 2004 First principles study of the solubility of Zr in Al (Dated: January 22, 2004) The experimental solubility limit of Zr in Al is well-known. Al3Zr has a stable the solubility limit of Zr in Al for the stable as well as the metastable phase diagrams. The formation energies

93

Investigation of abnormal negative threshold voltage shift under positive bias stress in input/output n-channel metal-oxide-semiconductor field-effect transistors with TiN/HfO{sub 2} structure using fast I-V measurement  

SciTech Connect (OSTI)

This letter investigates abnormal negative threshold voltage shifts under positive bias stress in input/output (I/O) TiN/HfO{sub 2} n-channel metal-oxide-semiconductor field-effect transistors using fast I-V measurement. This phenomenon is attributed to a reversible charge/discharge effect in pre-existing bulk traps. Moreover, in standard performance devices, threshold-voltage (V{sub t}) shifts positively during fast I-V double sweep measurement. However, in I/O devices, V{sub t} shifts negatively since electrons escape from bulk traps to metal gate rather than channel electrons injecting to bulk traps. Consequently, decreasing pre-existing bulk traps in I/O devices, which can be achieved by adopting Hf{sub x}Zr{sub 1?x}O{sub 2} as gate oxide, can reduce the charge/discharge effect.

Ho, Szu-Han; Chen, Ching-En; Tseng, Tseung-Yuen [Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300, Taiwan (China); Chang, Ting-Chang, E-mail: tcchang@mail.phys.nsysu.edu.tw; Lu, Ying-Hsin; Tsai, Jyun-Yu; Liu, Kuan-Ju [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Cheng, Osbert; Huang, Cheng-Tung; Lu, Ching-Sen [Device Department, United Microelectronics Corporation, Tainan Science Park, Taiwan (China)

2014-03-17T23:59:59.000Z

94

Interactions of oxygen with Zr(0001)  

SciTech Connect (OSTI)

Interaction of oxygen with Zr(0001) have been studied using low energy electron diffraction (LEED), work function ([Delta][phi]), static and dynamic secondary ion mass spectrometry (SSIMS, DSIMS), thermal desorption spectroscopy (TDS), Auger electron spectroscopy (AES) and nuclear reaction analysis (NRA). The initial sticking coefficient of oxygen is close to unity up to [approximately]0.75 ML at 90, 293 and 473 K. Oxygen chemisorption is disordered at room temperature and below. Heating the disordered surface to [approximately]473 K causes all oxygen to move to subsurface sites. A (1x2) ordered oxygen underlayer is formed consisting of three rotated domains of (1x2) superstructure with the oxygen atoms located between the first and second planes of zirconium atoms. This structure is stable up to about 573 K, above which temperature oxygen diffuses into the bulk. AES measurements employing oxide and metal signals were used to model the growth of oxide which was found to be temperature dependent. Both NRA and AES indicate linear oxygen uptake kinetics at 90 K with abrupt passivation as the limiting thickness is reached. SSIMS ion yield data taken during the oxidation of Zr(0001) at 90, 293 and 473 K was interpretable in the context of the oxygen coverage. Dissolution into the bulk of the saturated oxide layer grown at 90 K appears to occur by an island-type mechanism rather than layer-by-layer dissolution from the oxide-metal interface. Large [Delta][phi] changes that occur upon oxidation at 90 K and temperature ramping of the saturated oxide to 300 K are attributable to reversible molecular oxygen adsorption on the oxide. The diffusion of oxygen normal to the [0001] plane of zirconium has been measured by AES: D[sub 0] = (4.14.[+-]1.92) x 10[sup [minus]2] cm[sup [minus]2] s[sup [minus]1] and E[sub a]= 199.1 [+-]2.6 kJ mol[sup [minus]1]. The fundamental vibrational frequency for the [alpha]-Zr lattice was calculated to be (6.3 [+-] 2.9) x 10[sup 13]s[sup [minus]1].

Flinn, B.J.

1992-01-01T23:59:59.000Z

95

The mechanism of HF formation in LiPF6 based organic carbonate electrolytes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

The mechanism of HF formation in LiPF6 based organic carbonate electrolytes The mechanism of HF formation in LiPF6 based organic carbonate electrolytes Title The mechanism of HF formation in LiPF6 based organic carbonate electrolytes Publication Type Journal Article Year of Publication 2012 Authors Lux, Simon F., Ivan T. Lucas, Elad Pollak, Stefano Passerini, Martin Winter, and Robert Kostecki Journal Electrochemistry Communications Volume 14 Start Page 47 Issue 1 Pagination 47-50 Date Published 01/2012 Keywords Hydrofluoric acid, LiPF6 degradation, Lithium ion batteries, spectroscopic ellipsometry Abstract Spectroscopic ellipsometry was used to study the time-dependent formation of HF upon the thermal degradation of LiPF6 at 50 °C in a lithium ion battery electrolyte containing ethylene carbonate and diethyl carbonate. The generated HF was monitored by following the etching rate of a 300 nm thick SiO2 layer, grown on both sides of a silicon wafer substrate, as a function of the immersion time in the electrolyte at 50 °C. It was found that the formation of HF starts after 70 h of exposure time and occurs following several different phases. The amount of generated HF was calculated using an empirical formula correlating the etching rate to the temperature. Combining the results of the HF formation with literature data, a simplified mechanism for the formation of the HF involving LiPF6 degradation, and a simplified catalytical reaction pathway of the formed HF and silicon dioxide are proposed to describe the kinetics of HF formation.

96

Understanding Humic Acid / Zr(IV) Interaction - A Spectromicroscopy Approach  

SciTech Connect (OSTI)

Complexation of Zr(IV) by humic acid (HA) and polyacrylic acid (PAA) is investigated from the point of view of the organic ligand. STXM Spectromicroscopy and C 1s-NEXAFS point to different interaction mechanisms between Zr(IV) cations and oxo/hydroxo colloids and PAA. Under conditions where the metal aquo ion is stable, strong complexes are formed. In contrast, unspecific surface coating is identified when PAA is contacted with Zr(IV) oxo/hydroxide colloids. HA exhibits similar C 1s-NEXAFS features indicating a complexation reaction.

Rothe, Joerg; Plaschke, Markus; Denecke, Melissa A. [Forschungszentrum Karlsruhe, Institut fuer Nukleare Entsorgung, P.O. Box 3640, D-76021 Karlsruhe (Germany)

2007-02-02T23:59:59.000Z

97

Hydrogen production by steam reforming of LNG over Ni/Al2O3-ZrO2 catalysts: Effect of ZrO2 and preparation method of Al2O3-ZrO2  

Science Journals Connector (OSTI)

An Al2O3-ZrO2 support was prepared by grafting a zirconium precursor onto the surface of commercial ?-Al2O3. A physical mixture of Al2O3-ZrO2 was also prepared for the purpose of comparison. Ni/Al2O3-ZrO2 catalys...

Jeong Gil Seo; Min Hye Youn; Sunyoung Park…

2008-01-01T23:59:59.000Z

98

Finland HF and Esrange MST radar observations of polar mesosphere summer echoes  

E-Print Network [OSTI]

Finland HF and Esrange MST radar observations of polar mesosphere summer echoes Tadahiko Ogawa1 (200x) xx:1­8 Finland HF and Esrange MST radar observations of polar mesosphere summer echoes Tadahiko in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant

Kirkwood, Sheila

99

Interfacial and structural properties of sputtered HfO{sub 2} layers  

SciTech Connect (OSTI)

Magnetron sputtered HfO{sub 2} layers formed on a heated Si substrate were studied by spectroscopic ellipsometer (SE), x-ray diffraction (XRD), Fourier transform infrared (FTIR), and x-ray photoelectron spectroscopy (XPS) depth profiling techniques. The results show that the formation of a SiO{sub x} suboxide layer at the HfO{sub 2}/Si interface is unavoidable. The HfO{sub 2} thickness and suboxide formation are highly affected by the growth parameters such as sputtering power, O{sub 2}/Ar gas ratio during sputtering, sputtering time, and substrate temperature. XRD spectra show that the deposited film has (111) monoclinic phase of HfO{sub 2}, which is also supported by FTIR spectra. The atomic concentration and chemical environment of Si, Hf, and O have been measured as a function of depth starting from the surface of the sample by XPS technique. It shows that HfO{sub 2} layers of a few nanometers are formed at the top surface. Below this thin layer, Si-Si bonds are detected just before the Si suboxide layer, and then the Si substrate is reached during the depth profiling by XPS. It is clearly understood that the highly reactive sputtered Hf atoms consume some of the oxygen atoms from the underlying SiO{sub 2} to form HfO{sub 2}, leaving Si-Si bonds behind.

Aygun, G. [Department of Physics, Izmir Institute of Technology, Urla, TR-35430 Izmir (Turkey); Yildiz, I. [Department of Physics, Middle East Technical University, TR-06531 Ankara (Turkey); Central Laboratory, Middle East Technical University, TR-06531 Ankara (Turkey)

2009-07-01T23:59:59.000Z

100

Ca+HF: The anatomy of a chemical insertion reaction R. L. Jaffe  

E-Print Network [OSTI]

Ca+HF: The anatomy of a chemical insertion reaction R. L. Jaffe NASA Ames Research Center, Moffett theoretical investigation of the gas phase reaction Ca + HF-CaF + H is reported. The overall study involves electronic state of the Ca-F-H system, (b) careful fitting of the computed surface to an analytical form

Zare, Richard N.

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Electronic Structure of Hf@C28 and Its Ions. 1. SCF Calculations  

Science Journals Connector (OSTI)

Electronic Structure of Hf@C28 and Its Ions. 1. SCF Calculations ... Electronic Structures of C28H4 and Hf@C28H4 and Their Ions. ... Electronic structure calculations, including relativistic core potentials and the spin?orbit interaction, have been carried out on the C28, Pa@C28, and U@C28 species. ...

Debbie Fu-Tai Tuan; Russell M. Pitzer

1995-01-01T23:59:59.000Z

102

Ge interactions on HfO{sub 2} surfaces and kinetically driven patterning of Ge nanocrystals on HfO{sub 2}  

SciTech Connect (OSTI)

Germanium interactions are studied on HfO{sub 2} surfaces, which are prepared through physical vapor deposition (PVD) and by atomic layer deposition. X-ray photoelectron spectroscopy and temperature-programed desorption are used to follow the reactions of germanium on HfO{sub 2}. Germanium chemical vapor deposition at 870 K on HfO{sub 2} produces a GeO{sub x} adhesion layer, followed by growth of semiconducting Ge{sup 0}. PVD of 0.7 ML Ge (accomplished by thermally cracking GeH{sub 4} over a hot filament) also produces an initial GeO{sub x} layer, which is stable up to 800 K. PVD above 2.0 ML deposits semiconducting Ge{sup 0}. Temperature programed desorption experiments of {approx}1.0 ML Ge from HfO{sub 2} at 400-1100 K show GeH{sub 4} desorption below 600 K and GeO desorption above 850 K. These results are compared to Ge on SiO{sub 2} where GeO desorption is seen at 550 K. Exploiting the different reactivity of Ge on HfO{sub 2} and SiO{sub 2} allows a kinetically driven patterning scheme for high-density Ge nanoparticle growth on HfO{sub 2} surfaces that is demonstrated.

Stanley, Scott K.; Joshi, Sachin V.; Banerjee, Sanjay K.; Ekerdt, John G. [Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712-0231 (United States); Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, Texas 78712-0240 (United States); Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712-0231 (United States)

2006-01-15T23:59:59.000Z

103

Transition strengths in 86Nb and 86Zr  

Science Journals Connector (OSTI)

Mean lifetimes of states in 86Nb and 86Zr produced by the 58Ni(32S,3pn)86Nb and 58Ni(32S,4p)86Zr reactions at 130 MeV have been measured using the recoil-distance method. The B(E2) strength of 11(2) W.u. for the 8+?6+ transition in 86Nb implies weak collectivity at low excitation energies for the ?=+yrast band. The weak dipole transition strength of the 8+?7 decay suggests that the configuration for the 7? state is different from that of the other yrast states. In general, the B(E2) rates obtained for transitions in 86Zr agree with those previously published, thus supporting the suggestion of a weakly collective structure based on shell-model excitations at low energies. Hartree-Fock-Bogolyubov cranking calculations indicate a spherical shape for low-spin vacuum configuration states in 86Zr.

R. A. Kaye, J. B. Adams, A. Hale, C. Smith, G. Z. Solomon, S. L. Tabor, G. García-Bermúdez, M. A. Cardona, A. Filevich, and L. Szybisz

1998-05-01T23:59:59.000Z

104

Zr3Al creeps in a petty pace  

Science Journals Connector (OSTI)

... striking experiment is to be fully described in a conference report to be published by ASTM. Zr3Al is ordered (Cu3Au type, L12) up to its peritectoid transformation at 1 ...

Robert W. Cahn

1978-09-21T23:59:59.000Z

105

Crystal structure of Si-doped HfO{sub 2}  

SciTech Connect (OSTI)

Si-doped HfO{sub 2} was prepared by solid state synthesis of the starting oxides. Using Rietveld refinement of high resolution X-ray diffraction patterns, a substitutional limit of Si in HfO{sub 2} was determined as less than 9 at.?%. A second phase was identified as Cristobalite (SiO{sub 2}) rather than HfSiO{sub 4}, the latter of which would be expected from existing SiO{sub 2}-HfO{sub 2} phase diagrams. Crystallographic refinement with increased Si-dopant concentration in monoclinic HfO{sub 2} shows that c/b increases, while ? decreases. The spontaneous strain, which characterizes the ferroelastic distortion of the unit cell, was calculated and shown to decrease with increasing Si substitution.

Zhao, Lili [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); School of Information Science and Technology, Northwest University, Xi'an 710127 (China); Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States); Nelson, Matthew; Fancher, Chris M. [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Aldridge, Henry [Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States); Iamsasri, Thanakorn; Forrester, Jennifer S.; Jones, Jacob L., E-mail: jacobjones@ncsu.edu [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States); Nishida, Toshikazu [Department of Electrical and Computer Engineering, University of Florida, Gainesville, Florida 32611 (United States); Moghaddam, Saeed [Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611 (United States)

2014-01-21T23:59:59.000Z

106

Safety Slide 1 Hydrofluoric (HF) Acid Hazards http://www.emsworld.com/web/online/Education/Hydrofluoric-Acid-/5$12949  

E-Print Network [OSTI]

Safety Slide 1 ­ Hydrofluoric (HF) Acid Hazards http://www.emsworld.com/web may be delayed for up to 24 hours, even with dilute solutions. HF burns affect deep tissue layers

Cohen, Robert E.

107

Local Atomic-Jump Process of Iron in ? -Zr  

Science Journals Connector (OSTI)

After recoil implantation of Coulomb-excited Fe57 into ? -Zr at 24 K, 30% of the implanted atoms end up on interstitial positions where they experience large electric field gradients. Between 40 and 100 K the quadrupole splitting shrinks by a factor of 2 accompanied by a sharp decrease of the line intensity. This effect is interpreted as a localized diffusion of the Fe atoms jumping in the octahedral cage of the hcp Zr lattice.

Y. Yoshida; M. Menningen; R. Sielemann; G. Vogl; G. Weyer; K. Schröder

1988-07-11T23:59:59.000Z

108

Electrical properties of MIS capacitor using low temperature electron beam gun--evaporated HfAlO dielectrics  

E-Print Network [OSTI]

Electrical properties of MIS capacitor using low temperature electron beam gun--evaporated Hf of $1.45 nm was achieved in HfAlO films deposited by an electron beam gun evap- orator on unheated p of electron beam gun (EBG) evaporation to deposit high quality HfAlO films close to room temperature

Eisenstein, Gadi

109

Growth and characterization of UHV sputtering HfO2 film by plasma oxidation and low temperature annealing  

Science Journals Connector (OSTI)

Ultra-thin (?4.0 nm) HfO2 films were fabricated by plasma oxidation of sputtered metallic Hf films with post low temperature annealing. Advantage of this fabrication process is that the pre-deposition of Hf metal...

Q. Li; S. J. Wang; W. D. Wang; D. Z. Chi; A. C. H. Huan…

2006-07-01T23:59:59.000Z

110

Audit Report: OAS-RA-L-13-03 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Audit Report: OAS-RA-L-13-03 Audit Report: OAS-RA-L-13-03 Audit Report: OAS-RA-L-13-03 February 28, 2013 The Department of Energy's Solid-State Lighting Program The Department of Energy's (Department) Office of Energy Efficiency and Renewable Energy established the Solid-State Lighting Program to advance the development and market introduction of energy-efficient white-light sources for general illumination. The American Recovery and Reinvestment Act of 2009 appropriated more than $41 million to accelerate solid-state lighting research and development and jumpstart the manufacturing research and development initiative. Through competitive solicitations, the Department awarded financial assistance instruments to various recipients each year since the program's inception. The audit determined that the

111

Examination Report: OAS-RA-13-30 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Examination Report: OAS-RA-13-30 Examination Report: OAS-RA-13-30 Examination Report: OAS-RA-13-30 September 19, 2013 Alamo Area Council of Governments - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of Texas received $327 million in Weatherization Program Recovery Act grant funding, of which $15.5 million was allocated to the Alamo Area Council of Governments (Alamo) to weatherize approximately 3,000 homes. The State of Texas' Department of Housing and Community Affairs was responsible for

112

Examination Report: OAS-RA-13-30 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Examination Report: OAS-RA-13-30 Examination Report: OAS-RA-13-30 Examination Report: OAS-RA-13-30 September 19, 2013 Alamo Area Council of Governments - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of Texas received $327 million in Weatherization Program Recovery Act grant funding, of which $15.5 million was allocated to the Alamo Area Council of Governments (Alamo) to weatherize approximately 3,000 homes. The State of Texas' Department of Housing and Community Affairs was responsible for

113

Special Report: OAS-RA-10-04 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

OAS-RA-10-04 OAS-RA-10-04 Special Report: OAS-RA-10-04 February 19, 2010 Progress in Implementing the Department of Energy's Weatherization Assistance Program Under the American Recovery and Reinvestment Act The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted to stimulate the U.S. economy, create jobs and make infrastructure investments in energy and other areas. The Department of Energy's (Department) Weatherization Assistance Program received about $5 billion under the Recovery Act to improve the energy efficiency of nearly 590,000 residences of low income citizens -- a dramatic increase over the $450 million appropriated for this Program in Fiscal Year 2009. The Department awarded $4.73 billion of the Recovery Act funding in the form of grants to

114

Audit Special Report: OAS-RA-10-03 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

OAS-RA-10-03 OAS-RA-10-03 Audit Special Report: OAS-RA-10-03 December 7, 2009 Selected Department of Energy Program Efforts to Implement the American Recovery and Reinvestment Act The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted on February 17, 2009, to jumpstart the economy by creating or saving millions of jobs, spurring technological advances in health and science, and investing in the Nation's energy future. The Department of Energy received over $32.7 billion in Recovery Act funding for various science, energy, and environmental programs and initiatives. As of November 2009, the Department had obligated $18.3 billion of the Recovery Act funding, but only $1.4 billion had been spent. The Department's Offices of Energy Efficiency and Renewable Energy, Fossil Energy, Environmental

115

Special Review: OAS-RA-13-20 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Special Review: OAS-RA-13-20 Special Review: OAS-RA-13-20 Special Review: OAS-RA-13-20 May 13, 2013 Cost Incentives for the Department's Cleanup Contract in Idaho In Fiscal Year 2005, the Department of Energy (Department) awarded a Cost-Plus-Incentive-Fee contract to CH2M ♦ WG Idaho, LLC (CWI) to lead environmental cleanup of its Idaho National Laboratory site. The contract originally ran from May 1, 2005 through September 30, 2012, and has been extended for 3 years to September 30, 2015. The contract had a target cost of $2.7 billion and a target fee of $196 million (7.36 percent of target cost). The contract includes an additional incentive if work is completed under target cost. In addition to the target work to be completed within the contract, additional non-target work was allowed under Section

116

Inspection Report: INS-RA-L-12-01 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Inspection Report: INS-RA-L-12-01 Inspection Report: INS-RA-L-12-01 Inspection Report: INS-RA-L-12-01 December 16, 2011 Waste Disposal and Recovery Act Efforts at the Oak Ridge Reservation The Department of Energy (Department) expends billions of dollars to clean up contaminated sites and dispose of hazardous waste. The Department's Oak Ridge Office (ORO) is responsible for processing and disposing of the Transuranic (TRU) waste on the Oak Ridge Reservation (ORR), including approximately 3,500 cubic meters of legacy remote-handled (RH) and contact-handled (CH) TRU waste from more than 50 years of energy research and weapons production. The ORR was selected to receive $755 million in American Recovery and Reinvestment Act of 2009 (Recovery Act) funds, of which $143.5 million was allocated for the Transuranic Waste Processing

117

Special Report: IG-RA-09-02 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Special Report: IG-RA-09-02 Special Report: IG-RA-09-02 Special Report: IG-RA-09-02 March 30, 2009 The Department of Energy's Acquisition Workforce and its Impact on Implementation of the American Recovery and Reinvestment Act of 2009 Signed by the President on February 17, 2009, the American Recovery and Reinvestment Act of 2009 (Recovery Act) seeks to strengthen the U.S. economy through the creation of new jobs, aiding State and local governments with budget shortfalls, and investing in the long-term health of the Nation's economic prosperity. Under the Recovery Act, the Department of Energy will receive approximately $40 billion for various energy, environmental, and science programs and initiatives. To have an immediate stimulative impact on the U.S. economy, the Department's stated goal is to

118

Audit Report: OAS-RA-11-13 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Audit Report: OAS-RA-11-13 Audit Report: OAS-RA-11-13 Audit Report: OAS-RA-11-13 August 23, 2011 The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act in the State of Indiana Our review did not reveal material problems with the State of Indiana's management of the Weatherization Program and the three local agencies we visited - Hoosier Energy Rural Electric Cooperative, REAL Services, Inc., and Indiana Builders Association (IBA). We did, however, identify opportunities for the State and IBA to improve the efficiency and effectiveness of their Weatherization Programs. Specifically, we found that IBA had not always maintained documentation to support weatherization material costs reimbursed by the State, even though it was specifically

119

Examination Report: OAS-RA-11-18 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Examination Report: OAS-RA-11-18 Examination Report: OAS-RA-11-18 Examination Report: OAS-RA-11-18 September 29, 2011 Community Action Partnership of the Greater Dayton Area - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion to increase the energy efficiency of dwellings owned or occupied by low-income persons. Subsequently, the Department awarded a 3-year, $267 million Recovery Act weatherization grant to the State of Ohio's Department of Development. The State of Ohio allocated about $18 million of its grant to the Community Action Partnership of the Greater Dayton Area (Dayton) to weatherize 2,144

120

Audit Report: OAS-RA-L-11-11 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

OAS-RA-L-11-11 OAS-RA-L-11-11 Audit Report: OAS-RA-L-11-11 September 23, 2011 The Department of Energy's Energy Efficiency and Conservation Block Grant Program Funded under the American Recovery and Reinvestment Act for the State of Pennsylvania Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Energy Efficiency and Conservation Block Grant Program (Program) received $3.2 billion in funding to help U.S. cities, counties and states to develop, promote, implement and manage energy efficiency and conservation projects. Subsequently, the Department awarded a $23.6 million formula grant to the State of Pennsylvania's (State) Department of Environmental Protection (DEP). Of the $23.6 million awarded, the State retained about $1.2 million in funding for

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121

Special Report: IG-RA-09-02 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

RA-09-02 RA-09-02 Special Report: IG-RA-09-02 March 30, 2009 The Department of Energy's Acquisition Workforce and its Impact on Implementation of the American Recovery and Reinvestment Act of 2009 Signed by the President on February 17, 2009, the American Recovery and Reinvestment Act of 2009 (Recovery Act) seeks to strengthen the U.S. economy through the creation of new jobs, aiding State and local governments with budget shortfalls, and investing in the long-term health of the Nation's economic prosperity. Under the Recovery Act, the Department of Energy will receive approximately $40 billion for various energy, environmental, and science programs and initiatives. To have an immediate stimulative impact on the U.S. economy, the Department's stated goal is to ensure that these funds are spent as expeditiously as possible, without

122

Audit Report: OAS-RA-13-22 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Audit Report: OAS-RA-13-22 Audit Report: OAS-RA-13-22 Audit Report: OAS-RA-13-22 June 6, 2013 The Hydrogen Energy California Project Under the American Recovery and Reinvestment Act of 2009, the Department of Energy's (Department) Office of Fossil Energy received $3.4 billion to focus on the research, development and deployment of technologies to use coal more cleanly and efficiently. In September 2009, the Department approved a cooperative agreement award with a Government contribution of $308 million to Hydrogen Energy California, LLC (HECA) to construct a commercial power plant to demonstrate the capture and underground storage of carbon dioxide. The project was expected to be completed in November 2018, at a total cost of about $2.8 billion. In March 2011, after the Department and HECA spent approximately $75

123

Special Report: OAS-RA-09-01 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Special Report: OAS-RA-09-01 Special Report: OAS-RA-09-01 Special Report: OAS-RA-09-01 March 20, 2009 Special Report on "The American Recovery and Reinvestment Act at the Department of Energy The American Recovery and Reinvestment Act of 2009 (Recovery Act) was signed into law on February 17, 2009, as a way to jumpstart the U.S. economy, create or save millions of jobs, spur technological advances in science and health,and invest in the Nation's energy future. This national effort will require an unprecedented level of transparency and accountability to ensure that U.S. citizens know where their taxdollars are going and how they are being spent. As part of the Recovery Act, the Department of Energy will receive more than $38 billion to support a number of science, energy, and environmental initiatives. Additionally, the

124

Special Review: OAS-RA-13-20 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Special Review: OAS-RA-13-20 Special Review: OAS-RA-13-20 Special Review: OAS-RA-13-20 May 13, 2013 Cost Incentives for the Department's Cleanup Contract in Idaho In Fiscal Year 2005, the Department of Energy (Department) awarded a Cost-Plus-Incentive-Fee contract to CH2M ♦ WG Idaho, LLC (CWI) to lead environmental cleanup of its Idaho National Laboratory site. The contract originally ran from May 1, 2005 through September 30, 2012, and has been extended for 3 years to September 30, 2015. The contract had a target cost of $2.7 billion and a target fee of $196 million (7.36 percent of target cost). The contract includes an additional incentive if work is completed under target cost. In addition to the target work to be completed within the contract, additional non-target work was allowed under Section

125

Audit Report: OAS-RA-13-22 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Audit Report: OAS-RA-13-22 Audit Report: OAS-RA-13-22 Audit Report: OAS-RA-13-22 June 6, 2013 The Hydrogen Energy California Project Under the American Recovery and Reinvestment Act of 2009, the Department of Energy's (Department) Office of Fossil Energy received $3.4 billion to focus on the research, development and deployment of technologies to use coal more cleanly and efficiently. In September 2009, the Department approved a cooperative agreement award with a Government contribution of $308 million to Hydrogen Energy California, LLC (HECA) to construct a commercial power plant to demonstrate the capture and underground storage of carbon dioxide. The project was expected to be completed in November 2018, at a total cost of about $2.8 billion. In March 2011, after the Department and HECA spent approximately $75

126

Inspection Report: INS-RA-L-12-01 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

RA-L-12-01 RA-L-12-01 Inspection Report: INS-RA-L-12-01 December 16, 2011 Waste Disposal and Recovery Act Efforts at the Oak Ridge Reservation The Department of Energy (Department) expends billions of dollars to clean up contaminated sites and dispose of hazardous waste. The Department's Oak Ridge Office (ORO) is responsible for processing and disposing of the Transuranic (TRU) waste on the Oak Ridge Reservation (ORR), including approximately 3,500 cubic meters of legacy remote-handled (RH) and contact-handled (CH) TRU waste from more than 50 years of energy research and weapons production. The ORR was selected to receive $755 million in American Recovery and Reinvestment Act of 2009 (Recovery Act) funds, of which $143.5 million was allocated for the Transuranic Waste Processing

127

Audit Letter Report: OAS-RA-L-10-01 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Letter Report: OAS-RA-L-10-01 Letter Report: OAS-RA-L-10-01 Audit Letter Report: OAS-RA-L-10-01 April 6, 2010 The Department of Energy's Management of the NSLS-II Project The Department of Energy's (Department) Office of Science is currently constructing the National Synchrotron Light Source II (NSLS-II) at Brookhaven National Laboratory (Brookhaven) in Upton, New York. The NSLS-II is designed to replace the existing National Synchrotron Light Source (NSLS), which began operations in 1982. Approximately 2,100 researchers utilize the NSLS each year for research in such areas as biology and medicine, chemistry and environmental sciences, physics, and materials science. Construction of the NSLS-II began in Fiscal Year (FY) 2009 and the facility is scheduled to begin operations in FY 2015.

128

Investigative Report: INV-RA-11-01 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Investigative Report: INV-RA-11-01 Investigative Report: INV-RA-11-01 Investigative Report: INV-RA-11-01 December 3, 2010 Management Alert on the State Energy Efficient Appliance Rebate Program The purpose of this management alert is to convey concerns regarding state-level implementation of the Department of Energy's State Energy Efficient Appliance Rebate Program (Rebate Program), which promotes the purchase of ENERGY STAR® qualified appliances. The Office of Inspector General (OIG) recently received an allegation concerning potential abuse of the program in the State of Georgia. Our investigation confirmed that an individual purchased multiple hot water heaters and returned them to the store, yet applied for and inappropriately received rebates under the Rebate Program. While we cannot confirm whether or not this was an isolated

129

RAPID METHOD FOR DETERMINATION OF {sup 228}Ra IN WATER SAMPLES  

SciTech Connect (OSTI)

A new rapid method for the determination of {sup 228}Ra in natural water samples has been developed at the SRNL/EBL (Savannah River National Lab/ Environmental Bioassay Laboratory) that can be used for emergency response or routine samples. While gamma spectrometry can be employed with sufficient detection limits to determine {sup 228}Ra in solid samples (via {sup 228}Ac) , radiochemical methods that employ gas flow proportional counting techniques typically provide lower MDA (Minimal Detectable Activity) levels for the determination of {sup 228}Ra in water samples. Most radiochemical methods for {sup 228}Ra collect and purify {sup 228}Ra and allow for {sup 228}Ac daughter ingrowth for ~36 hours. In this new SRNL/EBL approach, {sup 228}Ac is collected and purified from the water sample without waiting to eliminate this delay. The sample preparation requires only about 4 hours so that {sup 228}Ra assay results on water samples can be achieved in < 6 hours. The method uses a rapid calcium carbonate precipitation enhanced with a small amount of phosphate added to enhance chemical yields (typically >90%), followed by rapid cation exchange removal of calcium. Lead, bismuth, uranium, thorium and protactinium isotopes are also removed by the cation exchange separation. {sup 228}Ac is eluted from the cation resin directly onto a DGA Resin cartridge attached to the bottom of the cation column to purify {sup 228}Ac. DGA Resin also removes lead and bismuth isotopes, along with Sr isotopes and {sup 90}Y. La is used to determine {sup 228}Ac chemical yield via ICP-MS, but {sup 133}Ba can also be used instead if ICP-MS assay is not available. Unlike some older methods, no lead or strontium holdback carriers or continual readjustment of sample pH is required.

Maxwell, S.

2012-09-05T23:59:59.000Z

130

Role of oxygen vacancy in HfO{sub 2}/SiO{sub 2}/Si(100) interfaces  

SciTech Connect (OSTI)

We have investigated the interface states in HfO{sub 2}/SiO{sub 2}/Si(100) systems that were prepared by using the in situ pulsed laser deposition technique. X-ray photoelectron spectroscopy data revealed that when the HfO{sub 2} film thickness exceeds 11 A, the film composition undergoes a systematic change from Hf silicate to oxygen-deficient HfO{sub x<2}. Furthermore, we determined that the evolution of the interface states clearly depends on the oxygen condition applied during the film growth and that the oxygen vacancy is an important parameter for Hf silicate formation.

Cho, Deok-Yong; Oh, S.-J.; Chang, Y.J.; Noh, T.W.; Jung, Ranju; Lee, Jae-Cheol [CSCMR and School of Physics, Seoul National University, Seoul 151-747 (Korea, Republic of); ReCOE and School of Physics, Seoul National University, Seoul 151-747 (Korea, Republic of); Samsung Advanced Institute of Technology, Suwon 440-900 (Korea, Republic of)

2006-05-08T23:59:59.000Z

131

Towards forming-free resistive switching in oxygen engineered HfO{sub 2?x}  

SciTech Connect (OSTI)

We have investigated the resistive switching behavior in stoichiometric HfO{sub 2} and oxygen-deficient HfO{sub 2?x} thin films grown on TiN electrodes using reactive molecular beam epitaxy. Oxygen defect states were controlled by the flow of oxygen radicals during thin film growth. Hard X-ray photoelectron spectroscopy confirmed the presence of sub-stoichiometric hafnium oxide and defect states near the Fermi level. The oxygen deficient HfO{sub 2?x} thin films show bipolar switching with an electroforming occurring at low voltages and low operating currents, paving the way for almost forming-free devices for low-power applications.

Sharath, S. U., E-mail: sharath@oxide.tu-darmstadt.de; Kurian, J.; Hildebrandt, E.; Alff, L. [Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Strasse 2, 64287 Darmstadt (Germany); Bertaud, T.; Walczyk, C.; Calka, P.; Zaumseil, P.; Sowinska, M.; Walczyk, D. [IHP, Im Technologiepark 25, 15236 Frankfurt Oder (Germany); Gloskovskii, A. [Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg (Germany); Schroeder, T. [IHP, Im Technologiepark 25, 15236 Frankfurt Oder (Germany); Brandenburgische Technische Universität, Konrad-Zuse-Strasse 1, 03046 Cottbus (Germany)

2014-02-10T23:59:59.000Z

132

Low energy N{sub 2} ion bombardment for removal of (HfO{sub 2}){sub x}(SiON){sub 1-x} in dilute HF  

SciTech Connect (OSTI)

The ion assisted wet removal of (HfO{sub 2}){sub x}(SiON){sub 1-x} high dielectric constant (k) materials and its effect on electrical properties were investigated. Crystallization temperature of (HfO{sub 2}){sub x}(SiON){sub 1-x} increased as the percentage of SiON increased. The crystallized (HfO{sub 2}){sub 0.6}(SiON){sub 0.4} was damaged and turned to an amorphous film via incorporation of N species into the film by N{sub 2} plasma treatment. In addition, the structure of (HfO{sub 2}){sub 0.6}(SiON){sub 0.4} was disintegrated into HfO{sub 2}, SiO(N), and ON after N{sub 2} plasma treatment. N{sub 2} plasmas using low bias power were applied for wet removal of high-k films and the mechanism of the ion assisted wet removal process was explored. When high bias power was applied, the surface of source and drain regions was nitrided via the reaction between N and Si substrates. Feasibility of the low bias power assisted wet removal process was demonstrated for short channel high-k metal oxide semiconductor device fabrication by the smaller shift of threshold voltage, compared to the high bias power assisted wet removal process as well as the wet-etching-only process.

Hwang, Wan Sik; Cho, Byung-Jin; Chan, Daniel S. H.; Yoo, Won Jong [Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, E4A 02-04, Engineering Drive 3, 117576 Singapore (Singapore); SKKU Advanced Institute of Nanotechnology (SAINT) and Department of Mechanical Engineering, Sungkyunkwan University 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of)

2007-07-15T23:59:59.000Z

133

Mixed cation phases in sputter deposited HfO{sub 2}-TiO{sub 2} nanolaminates  

SciTech Connect (OSTI)

Nanolaminate HfO{sub 2}-TiO{sub 2} films are grown by reactive sputter deposition on unheated fused SiO{sub 2}, sequentially annealed at 573 to 973 K, and studied by x-ray diffraction. A nanocrystalline structure of orthorhombic (o) HfTiO{sub 4} adjacent to an interface followed by monoclinic (m) Hf{sub 1-x}Ti{sub x}O{sub 2} is identified. m-Hf{sub 1-x}Ti{sub x}O{sub 2}, a metastable phase, is isomorphous with m-HfO{sub 2} and a high pressure phase, m-HfTiO{sub 4}. A Vegard's law analysis shows that the Ti atomic fraction in m-Hf{sub 1-x}Ti{sub x}O{sub 2} is much greater than Ti equilibrium solubility in m-HfO{sub 2}. A space group-subgroup argument proposes that m-Hf{sub 1-x}Ti{sub x}O{sub 2} arises from an o/m-HfTiO{sub 4} second order phase transition to accommodate the larger Hf atom.

Cisneros-Morales, M. C.; Aita, C. R. [Advanced Coatings Experimental Laboratory, College of Engineering and Applied Science, University of Wisconsin-Milwaukee, P.O. Box 784, Milwaukee, Wisconsin 53201 (United States)

2008-07-14T23:59:59.000Z

134

Suppression of interfacial reaction for HfO{sub 2} on silicon by pre-CF{sub 4} plasma treatment  

SciTech Connect (OSTI)

In this letter, the effects of pre-CF{sub 4} plasma treatment on Si for sputtered HfO{sub 2} gate dielectrics are investigated. The significant fluorine was incorporated at the HfO{sub 2}/Si substrate interface for a sample with the CF{sub 4} plasma pretreatment. The Hf silicide was suppressed and Hf-F bonding was observed for the CF{sub 4} plasma pretreated sample. Compared with the as-deposited sample, the effective oxide thickness was much reduced for the pre-CF{sub 4} plasma treated sample due to the elimination of the interfacial layer between HfO{sub 2} and Si substrate. These improved characteristics of the HfO{sub 2} gate dielectrics can be explained in terms of the fluorine atoms blocking oxygen diffusion through the HfO{sub 2} film into the Si substrate.

Lai, C.S.; Wu, W.C.; Chao, T.S.; Chen, J.H.; Wang, J.C.; Tay, L.-L.; Rowell, Nelson [Department of Electronic Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan (China); Department of Electronic Physics, National Chiao Tung University, 1001 Ta Hsueh Rd., Hsinchu 300, Taiwan (China); Department of Electronics Engineering, National Chiao Tung University, 1001 Ta Hsueh Rd., Hsinchu 300, Taiwan (China); Nanya Technology Corporation, Hwa-Ya Technology Park, 669 Fu-Hsing 3rd Rd., Kueishan, Taoyuan 338, Taiwan (China); Institute for Microstructural Sciences, National Research Council of Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6 (Canada)

2006-08-14T23:59:59.000Z

135

Supply of purified Th228 for Ra224 generators. Final CRADA Report .  

SciTech Connect (OSTI)

CRADA was terminated when it was determined that the Russians could not perform the terms of the subcontract. It became apparent that the Russians would not be a reliable source of Th228, as a precursor in the decay chain which leads to Ra224. Their government policies will prohibit the export of Th228 in quantities needed for commercial cancer therapy.

Ehst, D. A.; Nuclear Engineering Division

2009-10-02T23:59:59.000Z

136

Intrinsic Kinetics of Ethanol Dehydration Over Lewis Acidic Ordered Mesoporous Silicate, Zr-KIT-6  

Science Journals Connector (OSTI)

Lewis acidic Zr-KIT-6 catalyst was tested for ethanol dehydration. Under the reaction conditions studied (...P ethanol = 5 % in N2...), Zr-KIT-6 materials showed high ethylene selectivity (~80 %) ...

Qing Pan; Anand Ramanathan; W. Kirk Snavely; Raghunath V. Chaudhari…

2014-11-01T23:59:59.000Z

137

Determination of Boron in Silicate Samples by Direct Aspiration of Sample HF Solutions into ICPMS  

Science Journals Connector (OSTI)

A rapid and precise technique for the determination of boron content in silicate rocks was developed by employing isotope dilution inductively coupled plasma mass spectrometry with a flow injection system (FI-ID-ICPMS). The sample was decomposed with HF ...

Akio Makishima; Eizo Nakamura; Toshio Nakano

1997-09-15T23:59:59.000Z

138

Magnetospheric wave injection by modulated HF heating of the auroral electrojet.  

E-Print Network [OSTI]

?? Modulated High Frequency (HF, 3-30 MHz) heating of the auroral electrojet to generate electromagnetic waves in the Extremely Low Frequency (ELF, 3-3000 Hz) and… (more)

Golkowski, Mark

2009-01-01T23:59:59.000Z

139

LuHf isotope systematics of fossil biogenic apatite and their effects on geochronology  

E-Print Network [OSTI]

) and argillaceous matrices with low permeability (oil shale of Messel, Germany; Posidonienschiefer of Holzmaden the Eifel, Germany. Low 176 Lu/177 Hf ratios in all materials from the Middle Eocene Messel oil shale (e

Schöne, Bernd R.

140

Observations of small-scale plasma density depletions in arecibo HF heating experiments  

SciTech Connect (OSTI)

Observations of incoherent scattering of electromagnetic waves at UHF from Langmuir waves by a new scheme involving linear frequency modulation (chirping) of a UHF transmitter and the demodulation (dechirping) of the received signals have been applied during HF heating experiments. These observations show that the high power HF wave used for ionospheric modification creates small-scale plasma depletions instantly on a time scale of 5 ms. For a plasma frequency of 5.1 MHz, plasma frequency gradient of the order of 50 kHz/km, and power density input of the HF heater wave of 8.0 x 10/sup -5/ W/m/sup 2/ the depletion ranged from 3 to 5%. This appears to provide direct evidence that the HF-induced modifications involve Langmuir waves trapped in density cavities. copyrightAmerican Geophysical Union 1987

Isham, B.; Birkmayer, W.; Hagfors, T.; Kofman, W.

1987-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Simulation and detection of tsunami signatures in ocean surface currents measured by HF radar  

Science Journals Connector (OSTI)

High-frequency (HF) surface wave radars provide the unique capability to continuously monitor the coastal environment far beyond the range of conventional microwave radars. Bragg-resonant backscattering by ocean ...

Klaus-Werner Gurgel; Anna Dzvonkovskaya; Thomas Pohlmann; Thomas Schlick…

2011-10-01T23:59:59.000Z

142

In situ characterization of initial growth of HfO{sub 2}  

SciTech Connect (OSTI)

The initial growth of HfO{sub 2} on Si (111) is monitored in situ by ultrahigh vacuum (UHV) scanning probe microscopy. UHV scanning tunneling microscopy and UHV atomic force microscopy reveal the topography of HfO{sub 2} films in the initial stage. The chemical composition is further confirmed by x-ray photoelectron spectroscopy. Scanning tunneling spectroscopy is utilized to inspect the evolution of the bandgap. When the film thickness is less than 0.6 nm, the bandgap of HfO{sub 2} is not completely formed. A continuous usable HfO{sub 2} film with thickness of about 1.2 nm is presented in this work.

Wang, L.; Chu, Paul K. [Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon (Hong Kong); Xue, K.; Xu, J. B. [Department of Electronic Engineering, Chinese University of Hong Kong, Shatin, New Territories (Hong Kong)

2009-01-19T23:59:59.000Z

143

Germanium diffusion during HfO{sub 2} growth on Ge by molecular beam epitaxy  

SciTech Connect (OSTI)

The authors study the Ge diffusion during HfO{sub 2} growth by molecular beam epitaxy on differently in situ prepared germanium substrates and at different growth temperatures. While HfO{sub 2} layers grown directly on Ge do not show any germanium contamination, oxygen rich interfacial layers such as GeO{sub x} or GeO{sub x}N{sub y} partly dissolve into the HfO{sub 2} layer, giving rise to high Ge contamination (from 1% to 10%). The use of nitridated interfacial layers does not prevent Ge diffusion into the HfO{sub 2} during the growth process because of the high oxygen content present in the nitridated germanium layer.

Ferrari, S.; Spiga, S.; Wiemer, C.; Fanciulli, M.; Dimoulas, A. [Laboratorio MDM-INFM-CNR, Via Olivetti, 2 Agrate Brianza, Milano 20041 (Italy); MBE Laboratory, Institute of Materials Science, DEMOKRITOS National Center for Scientific Research, 153 10 Athens (Greece)

2006-09-18T23:59:59.000Z

144

Wind-speed inversion from HF radar first-order backscatter signal  

Science Journals Connector (OSTI)

Land-based high-frequency (HF) radars have the unique capability of continuously monitoring ocean surface environments at ranges up to 200 km off the coast. They provide reliable data on ocean surface currents an...

Wei Shen; Klaus-Werner Gurgel; George Voulgaris; Thomas Schlick…

2012-01-01T23:59:59.000Z

145

Plasma etching of HfO{sub 2} at elevated temperatures in chlorine-based chemistry  

SciTech Connect (OSTI)

Plasma etching of HfO{sub 2} at an elevated temperature is investigated in chlorine-based plasmas. Thermodynamic studies are performed in order to determine the most appropriate plasma chemistry. The theoretical calculations show that chlorocarbon gas chemistries (such as CCl{sub 4} or Cl{sub 2}-CO) can result in the chemical etching of HfO{sub 2} in the 425-625 K temperature range by forming volatile effluents such as HfCl{sub 4} and CO{sub 2}. The etching of HfO{sub 2} is first studied on blanket wafers in a high density Cl{sub 2}-CO plasma under low ion energy bombardment conditions (no bias power). Etch rates are presented and discussed with respect to the plasma parameters. The evolution of the etch rate as function of temperature follows an Arrhenius law indicating that the etching comes from chemical reactions. The etch rate of HfO{sub 2} is about 110 A /min at a temperature of 525 K with a selectivity towards SiO{sub 2} of 15. x-ray photoelectron spectroscopy analyses (XPS) reveal that neither carbon nor chlorine is detected on the HfO{sub 2} surface, whereas a chlorine-rich carbon layer is formed on top of the SiO{sub 2} surface leading to the selectivity between HfO{sub 2} and SiO{sub 2}. A drift of the HfO{sub 2} etch process is observed according to the chamber walls conditioning due to chlorine-rich carbon coatings formed on the chamber walls in a Cl{sub 2}-CO plasma. To get a very reproducible HfO{sub 2} etch process, the best conditioning strategy consists in cleaning the chamber walls with an O{sub 2} plasma between each wafer. The etching of HfO{sub 2} is also performed on patterned wafers using a conventional polysilicon gate. The first result show a slight HfO{sub 2} foot at the bottom of the gate and the presence of hafnium oxide-based residues in the active areas.

Helot, M.; Chevolleau, T.; Vallier, L.; Joubert, O.; Blanquet, E.; Pisch, A.; Mangiagalli, P.; Lill, T. [STMicroelectronics, 850 rue Jean Monnet, 38926 Crolles Cedex (France); Laboratoire des Technologies de la Microelectronique, CNRS, 17 rue des martyrs (CEA-LETI), 38054 Grenoble Cedex 09 (France); LTPCM/INPG-CNRS-UJF, 1130 rue de la piscine, 38402 Saint-Martin-d'Heres (France); Applied Materials, 974 E. Arques Ave. M/S 81334, Sunnyvale, California 94086 (United States)

2006-01-15T23:59:59.000Z

146

Optical Properties of ZrO2–Containing Anodic Coatings on Aluminum  

Science Journals Connector (OSTI)

Anodic oxide coatings (AOC) formed at the potentials of spark breakdowns...2ZrF6) contain up to 36 wt.% of Zr. The modification of ZrO2 in AOC is tetragonal. The reflection coefficients of AOC have been measured ...

P. M. Nedozorov; K. N. Kilin; T. P. Yarovaya…

2001-07-01T23:59:59.000Z

147

ccsd00001116 Nucleation of Al 3 Zr and Al 3 Sc in aluminum alloys  

E-Print Network [OSTI]

ccsd­00001116 (version 1) : 4 Feb 2004 Nucleation of Al 3 Zr and Al 3 Sc in aluminum alloys: from 4, 2004) Zr and Sc precipitate in aluminum alloys to form the compounds Al3Zr and Al3Sc which

148

Chemical states and electronic structure of a HfO(-2) / Ge(001) interface  

SciTech Connect (OSTI)

We report the chemical bonding structure and valence band alignment at the HfO{sub 2}/Ge (001) interface by systematically probing various core level spectra as well as valence band spectra using soft x-rays at the Stanford Synchrotron Radiation Laboratory. We investigated the chemical bonding changes as a function of depth through the dielectric stack by taking a series of synchrotron photoemission spectra as we etched through the HfO{sub 2} film using a dilute HF-solution. We found that a very non-stoichiometric GeO{sub x} layer exists at the HfO{sub 2}/Ge interface. The valence band spectra near the Fermi level in each different film structure were carefully analyzed, and as a result, the valence band offset between Ge and GeO{sub x} was determined to be {Delta}E{sub v} (Ge-GeO{sub x}) = 2.2 {+-} 0.15 eV, and that between Ge and HfO{sub 2}, {Delta}E{sub v} (Ge-HfO{sub 2}) = 2.7 {+-} 0.15 eV.

Seo, Kang-ill; McIntyre, Paul C.; /Stanford U., Materials Sci. Dept.; Sun, Shiyu; Lee, Dong-Ick; Pianetta, Piero; /SLAC, SSRL; Saraswat, Krishna C.; /Stanford U., Elect.

2005-05-04T23:59:59.000Z

149

HfO{sub x}N{sub y} gate dielectric on p-GaAs  

SciTech Connect (OSTI)

Plasma nitridation method is used for nitrogen incorporation in HfO{sub 2} based gate dielectrics for future GaAs-based devices. The nitrided HfO{sub 2} (HfO{sub x}N{sub y}) films on p-GaAs improve metal-oxide-semiconductor device characteristics such as interface state density, accumulation capacitance, hysteresis, and leakage current. An equivalent oxide thickness of 3.6 nm and a leakage current density of 10{sup -6} A cm{sup -2} have been achieved at V{sub FB}-1 V for nitrided HfO{sub 2} films. A nitride interfacial layer (GaAsO:N) was observed at HfO{sub 2}-GaAs interface, which can reduce the outdiffusion of elemental Ga and As during post-thermal annealing process. Such suppression of outdiffusion led to a substantial enhancement in the overall dielectric properties of the HfO{sub 2} film.

Dalapati, G. K.; Sridhara, A.; Wong, A. S. W.; Chia, C. K.; Chi, D. Z. [Institute of Materials Research and Engineering, A-STAR - Agency for Science, Technology and Research, 3 Research Link, Singapore 117602 (Singapore)

2009-02-16T23:59:59.000Z

150

Heavy Quasiparticles in the Ferromagnetic Superconductor ZrZn2  

Science Journals Connector (OSTI)

We report a study of the de Haas–van Alphen effect in the normal state of the ferromagnetic superconductor ZrZn2. Our results are generally consistent with a linear muffin-tin orbital band structure which predicts four exchange-split Fermi surface sheets. Quasiparticle effective masses are enhanced by a factor of 4.9 implying a strong coupling to magnetic excitations or phonons. ZrZn2 is unique among metallic ferromagnets in that it has a very large density of states in the ferromagnetic phase.

S. J. C. Yates; G. Santi; S. M. Hayden; P. J. Meeson; S. B. Dugdale

2003-02-06T23:59:59.000Z

151

Structural Characterization and Catalytic Activity of Nanosized CexM1-xO2 (M = Zr and Hf) Mixed Oxides  

Science Journals Connector (OSTI)

RS measurements suggest a defective structure of the mixed oxides resulting in the formation of oxygen vacancies. ... Improvements in such features are currently in demand for designing better catalytic cartridges for new-generation cleaner cars. ...

Benjaram M. Reddy; Pankaj Bharali; Pranjal Saikia; Sang-Eon Park; Maurits W. E. van den Berg; Martin Muhler; Wolfgang Grünert

2008-07-16T23:59:59.000Z

152

Special Report: OAS-RA-10-15 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

0-15 0-15 Special Report: OAS-RA-10-15 August 4, 2010 Review of the Department of Energy's Plan for Obligating Remaining Recovery Act Contract and Grant Funding Report OAS-RA-10-15, Review of the Department of Energy's Plan for Obligating Remaining Recovery Act Contract and Grant Funding, was issued to the Secretary and the Department's management on August 4, 2010. On August 5, 2010, the Department announced the award of the so-called "FutureGen 2.0" contract, using $1 billion of American Recovery and Reinvestment Act funding. Despite our request, specific information pertinent to this action was not provided to the Office of Inspector General prior to release of the audit report. These circumstances are described on page 4 of the report in the paragraph referring to the Fossil Energy Program. The data is highly

153

Nuclear fusion as a probe for octupole deformation in $^{224}$Ra  

E-Print Network [OSTI]

$\\textit{Background}$: Nuclear fusion has been shown to be a perfect probe to study the different nuclear shapes. However, the possibility of testing octupole deformation of a nucleus with this tool has not been fully explored yet. The presence of a stactic octupole deformation in nuclei will enhanced a possible permanent electric dipole moment, leading to a possible demonstration of parity violation. $\\textit{Purpose}$: To check whether static octupole deformation or octupole vibration in fusion give qualitatively different results so that both situations can be experimentally disentangled. $\\textit{Method}$: Fusion cross sections are computed in the Coupled-Channels formalism making use of the Ingoing-Wave Boundary Conditions (IWBC) for the systems $^{16}$O+$^{144}$Ba and $^{16}$O+$^{224}$Ra. $\\textit{Results}$: Barrier distributions of the two considered schemes show different patterns. For the $^{224}$Ra case, the octupole deformation parameter is large enough to create a sizeable difference. $\\textit{Con...

Kumar, Raj; Vitturi, A

2015-01-01T23:59:59.000Z

154

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic glasses  

E-Print Network [OSTI]

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic June 2010 The corrosion properties of two Zr-based bulk metallic glass, Zr41Ti14Cu12Ni10Be23 LM1 and Zr potential, LM1b showed superior corrosion resistance to LM1. Under identical sample preparation and testing

Zheng, Yufeng

155

Ra: A high efficiency, D-/sup 3/He, tandem mirror fusion reactor: Appendix C  

SciTech Connect (OSTI)

The Ra tandem mirror fusion reactor concept features inherent safety, high net plant efficiency, low cost of electricity, low radioactive waste generation, low activation, highly efficient direct conversion, thin radiation shields, and axisymmetric magnets. The safety and environmental features are achieved through the use of D/He-3 fuel, while the high efficiency derives from a new operating mode. ICRF stabilization allows an axisymmetric magnet set. 11 refs., 5 figs., 3 tabs.

Santarius, J.F.; Attaya, H.; Corradini, M.L.; El-Guebaly, L.A.; Emmert, G.A.; Kulcinski, G.L.; Larsen, E.M.; Maynard, C.W.; Musicki, Z.; Sawan, M.E.

1987-01-01T23:59:59.000Z

156

Quantifying saline groundwater flow into a freshwater lake using the Ra isotope quartet: A case study from the Sea of Galilee (Lake Kinneret), Israel  

E-Print Network [OSTI]

matter in the lake. A mass-balance calculation of the different 226Ra inventories reveals a saline in the lake is estimated as 3­4 yr. The 228Ra : 226Ra ratio of the lake water and a mass-balance calculation. Mass-balance calculations of the expected saline fluxes before the diversion of saline inflows

Paytan, Adina

157

Decay of 201–203Ra and 200–202Fr  

Science Journals Connector (OSTI)

Decay properties of the neutron-deficient nuclides 201–203Ra and 200–202Fr were investigated using ?- and ?-decay spectroscopy. The nuclei were produced in fusion-evaporation reactions of 56Fe projectiles with enriched 147Sm and 149Sm targets at the velocity filter SHIP at GSI in Darmstadt (Germany). The ? decay from the (3/2?) state in 201Ra was identified with an energy E?=7842(12) keV and half-life T1/2=8?4+40 ms. Ambiguous decay properties for 202Ra from previous measurements were clarified by remeasuring with significantly improved precision, resulting in values of E?=7722(7) keV and T1/2=3.8?0.8+1.3 ms. New short-lived isomeric states were identified in 200Fr and 201Fr with half-lives of 0.6?0.2+0.5 ?s and 0.7?0.2+0.5 ?s, respectively. A tentative spin and parity of 13/2+ were assigned to the latter. One event attributed to ?-delayed fission of 200Fr was observed.

Z. Kalaninová; S. Antalic; A. N. Andreyev; F. P. Heßberger; D. Ackermann; B. Andel; L. Bianco; S. Hofmann; M. Huyse; B. Kindler; B. Lommel; R. Mann; R. D. Page; P. J. Sapple; J. Thomson; P. Van Duppen; M. Venhart

2014-05-12T23:59:59.000Z

158

Thermally-driven H interaction with HfO{sub 2} films deposited on Ge(100) and Si(100)  

SciTech Connect (OSTI)

In the present work, we investigated the thermally-driven H incorporation in HfO{sub 2} films deposited on Si and Ge substrates. Two regimes for deuterium (D) uptake were identified, attributed to D bonded near the HfO{sub 2}/substrate interface region (at 300?°C) and through the whole HfO{sub 2} layer (400–600?°C). Films deposited on Si presented higher D amounts for all investigated temperatures, as well as, a higher resistance for D desorption. Moreover, HfO{sub 2} films underwent structural changes during annealings, influencing D incorporation. The semiconductor substrate plays a key role in this process.

Soares, G. V., E-mail: gabriel.soares@ufrgs.br; Feijó, T. O. [Instituto de Física, UFRGS, Porto Alegre 91509-900 (Brazil); Baumvol, I. J. R. [Instituto de Física, UFRGS, Porto Alegre 91509-900 (Brazil); Universidade de Caxias do Sul, Caxias do Sul 95070-560 (Brazil); Aguzzoli, C. [Universidade de Caxias do Sul, Caxias do Sul 95070-560 (Brazil); Krug, C. [Instituto de Física, UFRGS, Porto Alegre 91509-900 (Brazil); CEITEC S.A., Porto Alegre 91550-000 (Brazil); Radtke, C. [Instituto de Química, UFRGS, Porto Alegre 91509-900 (Brazil)

2014-01-27T23:59:59.000Z

159

Crystallization of Zr2PdxCu(1-x) and Zr2NixCu(1-x) Metallic Glass  

SciTech Connect (OSTI)

One interesting aspect of rretallic glasses is the numerous instances of the deviation of the phase selection from the amorphous state to thermodynamically stable phases during the crystallization process. Their devitrification pathways allow us to study the relationship between the original amorphous structure and their crystalline counter parts. Among the various factors of phase selections, size and electronic effects have been most extensively studied. Elucidating the phase selection process of a glassy alloy will be helpful to fill in the puzzle of the changes from disordered to ordered structures. In this thesis, Two model Zr{sub 2}Pd{sub x}Cu{sub (1-x)} and Zr{sub 2}Ni{sub x}Cu{sub (1-x)} (x = 0, 0.25, 0.5, 0.75 and 1) glassy systems were investigated since: (1) All of the samples can be made into a homogenous metallic glass; (2) The atomic radii differ from Pd to Cu is by 11%, while Ni has nearly the identical atomic size compare to Cu. Moreover, Pd and Ni differ by only one valence electron from Cu. Thus, these systems are ideal to test the idea of the effects of electronic structure and size factors; (3) The small number of components in these pseudo binary systems readily lend themselves to theoretical modeling. Using high temperature X-ray diffraction {HTXRD) and thermal analysis, topological, size, electronic, bond and chemical distribution factors on crystallization selections in Zr{sub 2}Pd{sub x}Cu{sub (1-x)} and Zr{sub 2}Ni{sub x}Cu{sub (1-x)} metallic glass have been explored. All Zr{sub 2}Pd{sub x}Cu{sub (1-x)} compositions share the same Cu11b phase with different pathways of meta-stable, icosahedral quasicrystalline phase (i-phase), and C16 phase formations. The quasicrystal phase formation is topologically related to the increasing icosahedral short range order (SRO) with Pd content in Zr{sub 2}Pd{sub x}Cu{sub (1·x)} system. Meta-stable C16 phase is competitive with C11b phase at x = 0.5, which is dominated by electronic structure rather than size effects. Cu-rich and Ni-rich compositions in Zr{sub 2}Ni{sub x}Cu{sub (1-x)} trend to divitrify to C11b or C16 phases respectively. In the proposed pseudo binary phase diagram, the domain of C16, C11b and co-existence phases are mainly related with the topology in the amorphous structure and formation enthalpies of crystalline phases.

Min Xu

2008-08-18T23:59:59.000Z

160

Spectroscopic analysis of Al and N diffusion in HfO{sub 2}  

SciTech Connect (OSTI)

X-ray photoelectron core level spectroscopy, secondary ion mass spectroscopy, spectroscopic ellipsometry, and extended x-ray absorption fine structure measurements have been employed to distinguish the effects of Al and N diffusion on the local bonding and microstructure of HfO{sub 2} and its interface with the Si substrate in (001)Si/SiO{sub x}/2 nm HfO{sub 2}/1 nm AlO{sub x} film structures. The diffusion of Al from the thin AlO{sub x} cap layer deposited on both annealed and unannealed HfO{sub 2} has been observed following anneal in N{sub 2} and NH{sub 3} ambient. Both N{sub 2} and NH{sub 3} subsequent anneals were performed to decouple incorporated nitrogen from thermal reactions alone. Causal variations in the HfO{sub 2} microstructure combined with the dependence of Al and N diffusion on initial HfO{sub 2} conditions are presented with respect to anneal temperature and ambient.

Lysaght, P. S.; Price, J.; Kirsch, P. D. [SEMATECH, 257 Fuller Rd, Albany, New York 12203 (United States); Woicik, J. C.; Weiland, C. [National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Sahiner, M. A. [Seton Hall University, 400 South Orange Ave, South Orange, New Jersey 07079 (United States)

2012-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

HF treatment effect for carbon deposition on silicon (111) by DC sputtering technique  

SciTech Connect (OSTI)

Surface modifications of Si (111) substrate by HF solution for thin film carbon deposition have been systematically studied. Thin film carbon on Si (111) has been deposited using DC Unbalanced Magnetron Sputtering with carbon pellet doped by 5% Fe as the target. EDAX characterization confirmed that the carbon fraction on Si substrate much higher by dipping a clean Si substrate by HF solution before sputtering process in comparison with carbon fraction on Si substrate just after conventional RCA. Moreover, SEM and AFM images show the uniform thin film carbon on Si with HF treatment, in contrast to the Si without HF solution treatment. These experimental results suggest that HF treatment of Si surface provide Si-H bonds on top Si surface that useful to enhance the carbon deposition during sputtering process. Furthermore, we investigate the thermal stability of thin film carbon on Si by thermal annealing process up to 900 °C. Atomic arrangements during annealing process were characterized by Raman spectroscopy. Raman spectra indicate that thin film carbon on Si is remaining unchanged until 600 °C and carbon atoms start to diffuse toward Si substrate after annealing at 900 °C.

Aji, A. S., E-mail: aji.ravazes70@gmail.com; Darma, Y., E-mail: aji.ravazes70@gmail.com [Quantum Semiconductor and Devices Lab., Physics of Material Electronics Research Division, Department of Physics, Institut Teknologi Bandung (Indonesia)

2014-03-24T23:59:59.000Z

162

Electronic structure of HfN0.93(100) studied by angle-resolved photoemission  

Science Journals Connector (OSTI)

An experimental and theoretical study of the electronic structure of HfN is reported. Results from angle-resolved photoemission experiments on HfN0.93(100) are presented and interpreted with use of calculated results. The bulk-band structure of stoichiometric HfN was calculated relativistically and nonrelativistically using the linear augmented-plane-wave method. Predicted band locations and dispersions along the ?–X direction are compared with experimental results. In general the experiment indicates smaller bandwidths and locates the bands deeper below the Fermi level than the calculated values. Calculations of photoemission spectra, made nonrelativistically, are also reported and these spectra are found to reflect the recorded spectra fairly well.

J. Lindström; L. I. Johansson; P. E. S. Persson; A. Callens; D. S. L. Law; A. N. Christensen

1989-02-15T23:59:59.000Z

163

On the K{sup {pi}} = 0{sup +} rotational bands in the {sup 178}Hf nucleus  

SciTech Connect (OSTI)

The results obtained by studying the angular distributions of gamma rays with respect to the neutron-beam axis in the reaction {sup 178}Hf(n, n'{gamma}) involving the deexcitation of the K{sup {pi}} = 0{sup +} rotational bands of {sup 178}Hf are presented.New information about themultipole-mixing parameter {delta} in gamma transitions from the levels of these bands is obtained. The K{sup {pi}} = 0{sub 4}{sup +} band is constructed anew. The relationship between the parameter {delta} for the (2{sup +}0{sub n}-2{sup +}0{sub 1}) gamma transition and the energy gap {Delta}{sub n} = E{sub lev}(2{sup +}0{sub n}) - E{sub lev}(0{sup +}0{sub n}), on one hand, and the quasiparticle structure of the rotational band, on the other hand, is discussed for {sup 178}Hf on the basis of the quasiparticle-phonon model.

Govor, L. I.; Demidov, A. M.; Kurkin, V. A., E-mail: kurkin@polyn.kiae.su; Mikhailov, I. V. [Russian Research Centre Kurchatov Institute (Russian Federation)

2010-07-15T23:59:59.000Z

164

Band offsets in HfO{sub 2}/InGaZnO{sub 4} heterojunctions  

SciTech Connect (OSTI)

The valence band discontinuity ({Delta}E{sub V}) of sputter deposited HfO{sub 2}/InZnGaO{sub 4} (IGZO) heterostructures was obtained from x-ray photoelectron spectroscopy measurements. The HfO{sub 2} exhibited a bandgap of 6.07 eV from absorption measurements. A value of {Delta}E{sub V} = 0.48 {+-} 0.025 eV was obtained by using the Ga 2p{sub 3/2}, Zn 2p{sub 3/2}, and In 3d{sub 5/2} energy levels as references. This implies a conduction band offset {Delta}E{sub C} of 2.39 eV in HfO{sub 2}/InGaZnO{sub 4} heterostructures and a nested interface band alignment.

Cho, Hyun [Department of Nanomechatronics Engineering, Pusan National University, Gyeongnam 627-706 (Korea, Republic of); Douglas, E. A.; Gila, B. P.; Craciun, V.; Lambers, E. S.; Pearton, S. J. [Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States); Ren Fan [Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611 (United States)

2012-01-02T23:59:59.000Z

165

Ge doped HfO{sub 2} thin films investigated by x-ray absorption spectroscopy  

SciTech Connect (OSTI)

The stability of the tetragonal phase of Ge doped HfO{sub 2} thin films on Si(100) was investigated. Hf(Ge)O{sub 2} films with Ge atomic concentrations varying from 0% to 15% were deposited by remote plasma chemical vapor deposition. The atomic structure on the oxide after rapid thermal annealing was investigated by x-ray absorption spectroscopy of the O and Ge K edges and by Rutherford backscattering spectrometry. The authors found that Ge concentrations as low as 5 at. % effectively stabilize the tetragonal phase of 5 nm thick Hf(Ge)O{sub 2} on Si and that higher concentrations are not stable to rapid thermal annealing at temperatures above 750 deg. C.

Miotti, Leonardo; Bastos, Karen P.; Lucovsky, Gerald; Radtke, Claudio; Nordlund, Dennis [Department of Physics, North Carolina State University, Box 8202, Raleigh, North Carolina 27695-8202 (United States); Instituto de Quimica, Universidade Federal do Rio Grande do Sul, 91509-900 Porto Alegre (Brazil); Stanford Synchrotron Radiation Lightsource, Menlo Park, California 94025 (United States)

2010-07-15T23:59:59.000Z

166

Fabrication and properties of ZrC–ZrB2/Ni cermet coatings on a magnesium alloy by atmospheric plasma spraying of SHS powders  

Science Journals Connector (OSTI)

Abstract ZrB2–ZrC/Ni composite powders were successfully produced from a Ni–Zr–B4C system by self-propagating high-temperature synthesis (SHS), and ZrB2–ZrC/Ni cermet coatings were deposited on a magnesium alloy substrate by atmospheric plasma spraying (APS) using the SHS-derived powders as feedstock powders. Microstructure and phase composition of the SHS powders and APS coatings were investigated by scanning electron microscopy and X-ray diffraction, respectively. Microhardness and wear resistance of the coatings were examined by using a Vickers hardness tester and pin-on-desk tribometer. The coatings exhibited lamellar and porous structure, mainly consisting of ZrB2, ZrC and Ni in addition to the by-product ZrO2. The coatings bonded well to the substrate with the bonding strength as high as 16.27 MPa. Microhardness and wear resistance of the substrate were significantly improved by the coatings. The wear resistance of the coatings for the substrate initially increased and subsequently decreased with the increase in Ni content. The coating with 30 wt% Ni in the feedstock powder displayed the highest microhardness of 525.02±96.08 HV0.1 and the best wear resistance for the substrate.

Jiaying Xu; Binglin Zou; Sumei Zhao; Yu Hui; Wenzhi Huang; Xin Zhou; Ying Wang; Xiaolong Cai; Xueqiang Cao

2014-01-01T23:59:59.000Z

167

Optical spectroscopic study of the SiN/HfO{sub 2} interfacial formation during rf sputtering of HfO{sub 2}  

SciTech Connect (OSTI)

High-k stacks formed by chemical-vapor-deposited SiN and high-pressure sputtered HfO{sub 2} in either O{sub 2} or Ar atmosphere have been studied. The introduction of a SiN layer is proposed to prevent the uncontrollable SiO{sub 2} growth while sputtering. The formation of Si-O bonds after the sputtering of the HfO{sub 2} film in O{sub 2} atmosphere was observed by infrared spectroscopy. Optical diagnosis of the plasma demonstrated a high density of O radicals in the system when working with O{sub 2}. The small radius and high reactivity of these O radicals are the source of the SiN oxidation. However, the structure of the SiN film is preserved during Ar sputtering.

Toledano-Luque, M.; Lucia, M. L.; Prado, A. del; San Andres, E.; Martil, I.; Gonzalez-Diaz, G. [Departamento de Fisica Aplicada III, Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid (Spain)

2007-11-05T23:59:59.000Z

168

Two-step behavior of initial oxidation at HfO{sub 2}/Si interface  

SciTech Connect (OSTI)

In situ x-ray photoelectron spectroscopy revealed that initial Si oxidation at the HfO{sub 2}/Si(001) interface in O{sub 2} proceeds in a two-step manner with an initial slow stage followed by a fast one. This transition in the oxidation process is most likely caused by crystallization of the HfO{sub 2} film. The first stage at 400-600 deg. C exhibited postdeposition annealing conditions suitable for suppressing the interfacial Si oxide in a monolayer region.

Miyata, Noriyuki [MIRAI, Advanced Semiconductor Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8562 (Japan)

2006-09-04T23:59:59.000Z

169

Wear and friction behavior of Zr implanted D3 steel  

SciTech Connect (OSTI)

Multicharged, pure, high current and pulsed ion beams of Zr have been extracted from a metal vapor vacuum arc (MEVVA) source and implanted into AISI D3 (C: 2-2,35%, Mn: 0,60%, Si: 0,60%, Cr: 11-13,50%, Ni: 0,30%, W: 1%, V: 1%) tool steel samples at the 3,6.1016, 5.1016 and 1.1017 ions/cm2 doses. The wear resistance and friction coefficient have been estimated using pin-on-disc wear tests. Implantation of Zr decreased the wear loss and friction coefficient. RBS, AES and SEM Microprobe analyses were used as a guide for explanation of implantation's effects.

Akbas, N.; Saklakoglu, I.E.; Monteiro, O.R.; Brown, I.G.

2001-08-23T23:59:59.000Z

170

The comparative kinetics of Ca, Sr, And Ra in a freshwater turtle, Trachemys scripta  

SciTech Connect (OSTI)

The accumulation of {sup 45}Ca, {sup 47}Ca, {sup 88}Sr, and {sup 226}Ra was studied in the yellow-bellied slider, a common freshwater turtle of the Southeastern US. The author was particularly interested in testing the hypothesis of competitive inhibition, a concept whereby decreasing the intake of a stable dietary element increases the absorption and retention of chemically similar radionuclides. He established four specific hypotheses and examined the processes of absorption and elimination as a function of stable dietary calcium (2 and 20 mg g{sup {minus}1}), season (summer, fall, winter and spring), and age and sex of the animals (hatchlings, juveniles, adult males, adult females, and gravid females). Turtles were gavaged with radionuclides and the gamma-emitting isotopes were detected during serial whole-body counts performed on the live animals for up to 480 d. The analysis of the beta-emitting {sup 45}Ca was accomplished by chemical separation procedures. Data were fit to a two-component exponential retention model by nonlinear regression. The 10-fold reduction in dietary Ca did not affect the elimination rate constants, and increased the assimilation of Sr and Ra only within juveniles. For all animals the absorption of Ca was significantly greater than Sr, and likewise, Sr was greater than Ra. Mean absorptions were generally higher than values reported for other organisms. Unlike many other organisms, absorption rates did not decline at maturity. He suspects that high Ca demands in constructing and maintaining the massive shell, necessitated by the turtle's survival strategy, may contribute to the high absorption, as well as the lack of a decline at maturity. Elimination rate constants were greatest in the summer and declined to levels that were generally not distinguishable from zero in the spring, winter, and fall seasons.

Hinton, T.G.

1989-01-01T23:59:59.000Z

171

High-power ELF radiation generated by modulated HF heating of the ionosphere can cause Earthquakes, Cyclones and localized heating  

E-Print Network [OSTI]

High-power ELF radiation generated by modulated HF heating of the ionosphere can cause Earthquakes, the HAARP heater is the most powerful ionospheric heater, with 3.6GW of effective power using HF heating, Cyclones and localized heating Fran De Aquino Maranhao State University, Physics Department, S

Paris-Sud XI, Université de

172

The Department of Energy's Solid-State Lighting Program, OAS-RA-L-13-03  

Broader source: Energy.gov (indexed) [DOE]

Solid- Solid- State Lighting Program OAS-RA-L-13-03 February 2013 Department of Energy Washington, DC 20585 February 28, 2013 MEMORANDUM FOR THE DIRECTOR, NATIONAL ENERGY TECHNOLOGY LABORATORY FROM: Jack Rouch, Director Central Audits Division Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's Solid-State Lighting Program" BACKGROUND The Department of Energy's (Department) Office of Energy Efficiency and Renewable Energy established the Solid-State Lighting Program to advance the development and market introduction of energy-efficient white-light sources for general illumination. Since 2003, the Department has cooperated with industry partners to invest in research and development of solid-

173

The Department of Energy's Transportation Electrification Program, 0AS-RA-12-11  

Broader source: Energy.gov (indexed) [DOE]

Transportation Electrification Transportation Electrification Program OAS-RA-12-11 May 2012 Department of Energy Washington, DC 20585 May 10, 2012 MEMORANDUM FOR THE DEPUTY ASSISTANT SECRETARY FOR ENERGY EFFICIENCY FROM: Joanne Hill, Director Central Audits Division Office of Inspector General SUBJECT: INFORMATION: Special Report on "The Department of Energy's Transportation Electrification Program" INTRODUCTION The Department of Energy established the Transportation Electrification Program (Program) to demonstrate and evaluate the deployment of plug-in hybrid vehicles and their associated infrastructure needs. Funded by the American Recovery and Reinvestment Act of 2009, the Program provided about $400 million to 18 grant recipients-12 non-profit entities and 6 for-

174

Photoemission study of energy-band alignment for RuO{sub x}/HfO{sub 2}/Si system  

SciTech Connect (OSTI)

Conductive oxides RuO{sub x} as alternative electrode on high-{kappa} HfO{sub 2} gate dielectric have been fabricated by ultrahigh-vacuum sputtering and subsequently oxidized using oxygen plasma. The energy-band alignment for the RuO{sub x}/HfO{sub 2}/Si system and the oxidation-state dependence of barrier height for RuO{sub x} contacting to HfO{sub 2} dielectrics has been analyzed by x-ray photoemission spectroscopy. The valence- and conduction-band offsets of HfO{sub 2}/Si are determined to be 3.05{+-}0.1 and 1.48{+-}0.1 eV, respectively. The barrier heights for the RuO{sub x} contacting to HfO{sub 2} are oxidation-state dependent, in the range of 1.95-2.73 eV.

Li, Q.; Wang, S.J.; Li, K.B.; Huan, A.C.H.; Chai, J.W.; Pan, J.S.; Ong, C.K. [Department of Physics, National University of Singapore, Singapore 117542 (Singapore); Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602 (Singapore); Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608 (Singapore); Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore and Department of Physics, National University of Singapore, Singapore 117542 (Singapore); Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602 (Singapore); Department of Physics, National University of Singapore, Singapore 117542 (Singapore)

2004-12-20T23:59:59.000Z

175

Low-temperature method for enhancing sputter-deposited HfO{sub 2} films with complete oxidization  

SciTech Connect (OSTI)

A low-temperature method, supercritical CO{sub 2} fluid (SCF) technology, is proposed to improve the dielectric properties of ultrathin hafnium oxide (HfO{sub 2}) film at 150 deg. C without significant formation of parasitic oxide at the interface between HfO{sub 2} and Si substrate. In this research, the HfO{sub 2} films were deposited by dc sputter at room temperature and post-treated by SCF which is mixed with 5 vol % propyl alcohol and 5 vol % H{sub 2}O. From high-resolution transmission electron microscopy image, the interfacial oxide of SCF-treated HfO{sub 2} film is only 5 A ring thick. Additionally, the enhancements in the qualities of sputter-deposited HfO{sub 2} film after SCF process are exhibited by x-ray photoelectron spectroscopy and capacitance-voltage (C-V) measurement.

Tsai, C.-T.; Chang, T.-C.; Liu, P.-T.; Yang, P.-Y.; Kuo, Y.-C.; Kin, K.-T.; Chang, P.-L.; Huang, F.-S. [Institute of Electronics Engineering, National Tsing Hua University, HsinChu 300, Taiwan (China); Department of Physics and Institute of Electro-Optical Engineering, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, 70 Lien-Hai Road, Kaohsiung 804, Taiwan (China); Department of Photonics and Display Institute, National Chiao Tung University, 1001 Ta-Hsueh Rd., HsinChu 300, Taiwan (China); Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 300, Taiwan (China); Institute of Electronics Engineering, National Tsing Hua University, HsinChu 300, Taiwan (China)

2007-07-02T23:59:59.000Z

176

E-Print Network 3.0 - application zr-sn alloys Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

used... , Zr, Sn, ... Source: Zheng, Yufeng - Department of Advanced Materials and Nanotechnology, Peking University Collection: Materials Science ; Biology and Medicine 2...

177

MicroPlanet Technology Corp formerly HF Capital Corp | Open Energy  

Open Energy Info (EERE)

Technology Corp formerly HF Capital Corp Technology Corp formerly HF Capital Corp Jump to: navigation, search Name MicroPlanet Technology Corp (formerly HF Capital Corp) Place Seattle, Washington Zip 98104 Sector Efficiency Product MicroPlanet develops energy-efficiency products for homes and small businesses. Specifically they focus on custom voltage regulators that result in energy savings. On May 6, 2005, the company reverse-listed into Toronto Venture Exchange quoted HF Capital. Coordinates 47.60356°, -122.329439° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":47.60356,"lon":-122.329439,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

178

High-spin excitations in 158,159,160 Hf from recoil-decay tagging  

E-Print Network [OSTI]

Argonne National Laboratory, Argonne, Illinois 60439 3 Nuclear Science Division, Lawrence Berkeley coupled to the Fragment Mass Analyzer at Argonne National Laboratory. Level structures of 158 Hf and 159 technique at Argonne National Laboratory. These reactions have a large number of particle

179

ELF/VLF PHASED ARRAY GENERATION VIA FREQUENCY-MATCHED STEERING OF A CONTINUOUS HF  

E-Print Network [OSTI]

;Abstract The radio spectrum between 300 Hz and 10 kHz (ELF/VLF) has broad applications to global (HF, 3-10 MHz) heating of the lower ionosphere (60-100 km altitude), which changes the atmospheric plasma conductivity. In the presence of natural currents such as the auroral electrojet, ON

180

Scanning tunneling microscopy study of nitrogen incorporated HfO{sub 2}  

SciTech Connect (OSTI)

The impact of nitrogen incorporation on the physical and electrical characteristics of the HfO{sub 2} is examined. X-ray photoelectron spectroscopy shows that nitrogen can be incorporated into the HfO{sub 2} via a two-step thermal anneal--first in ultrahigh vacuum (UHV) and subsequently in N{sub 2}. Following the N{sub 2} anneal, scanning tunneling microscopy in UHV reveals a marked reduction in the low-voltage leakage current under gate injection biasing. From band theory and existing first-principles simulation results, one may consistently attribute this improvement to the passivation of oxygen vacancies in the HfO{sub 2} by nitrogen. Improvement in the breakdown strength of the HfO{sub 2} subjected to ramp-voltage stress (substrate injection) is also observed after the N{sub 2} anneal. The local current-voltage curves acquired concurrently during the ramp-voltage stress exhibit 'space-charge limited conduction', which implies that the observed improvement in breakdown strength may be related to a limitation of the current flow through the gate stack in the high stress voltage regime.

Ong, Y. C.; Ang, D. S.; Pey, K. L.; Li, X. [Nanyang Technological University, School of Electrical and Electronic Engineering, Nanyang Avenue, Singapore 639798 (Singapore); O'Shea, S. J.; Wang, S. J. [Institute of Materials Research and Engineering, A-STAR - Agency for Science, Technology and Research, 3 Research Link, Singapore 11760 (Singapore); Tung, C. H. [Institute of Microelectronics, A-STAR - Agency for Science, Technology and Research, 11 Science Park Road, Singapore Science Park II, Singapore 117685 (Singapore)

2008-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
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181

Metal-gate-induced reduction of the interfacial layer in Hf oxide gate stacks  

SciTech Connect (OSTI)

The properties of high-{kappa} metal oxide gate stacks are often determined in the final processing steps following dielectric deposition. We report here results from medium energy ion scattering and x-ray photoelectron spectroscopy studies of oxygen and silicon diffusion and interfacial layer reactions in multilayer gate stacks. Our results show that Ti metallization of HfO{sub 2}/SiO{sub 2}/Si stacks reduces the SiO{sub 2} interlayer and (to a more limited extent) the HfO{sub 2} layer. We find that Si atoms initially present in the interfacial SiO{sub 2} layer incorporate into the bottom of the high-{kappa} layer. Some evidence for Ti-Si interdiffusion through the high-{kappa} film in the presence of a Ti gate in the crystalline HfO{sub 2} films is also reported. This diffusion is likely to be related to defects in crystalline HfO{sub 2} films, such as grain boundaries. High-resolution transmission electron microscopy and corresponding electron energy loss spectroscopy scans show aggressive Ti-Si intermixing and oxygen diffusion to the outermost Ti layer, given high enough annealing temperature. Thermodynamic calculations show that the driving forces exist for some of the observed diffusion processes.

Goncharova, L. V.; Dalponte, M.; Gustafsson, T.; Celik, O.; Garfunkel, E.; Lysaght, P. S.; Bersuker, G. [Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers University, 136 Frelinghuysen Rd., Piscataway, New Jersey 08854 (United States); Department of Chemistry and Chemical Biology, and Laboratory for Surface Modification, Rutgers University, 610 Taylor Rd., Piscataway, New Jersey 08854 (United States); SEMATECH, 2705 Montopolis Dr., Austin, Texas 78741 (United States)

2007-03-15T23:59:59.000Z

182

Investigation of HF plasma turbulence excitation and dissipation in the vicinity of 5th  

E-Print Network [OSTI]

of stimulated electromagnetic emission (SEE) of the ionosphere pumped by powerful HF radio waves are presented, Uppsala Division, SE-751 21 Uppsala, Sweden Experimental results on development and relaxation times after PW turn off d 0.7­1.0 ms are 2­4 times faster than collisional ones for the Langmuir waves

183

Oxygen diffusion and reactions in Hf-based dielectrics L. V. Goncharova,a  

E-Print Network [OSTI]

Oxygen diffusion and reactions in Hf-based dielectrics L. V. Goncharova,a M. Dalponte, D. G Oxygen transport in and reactions with thin hafnium oxide and hafnium silicate films have been. The exchange rate is faster for pure hafnium oxides than for silicates. The amount of exchanged oxygen

Gustafsson, Torgny

184

Control of silicidation in HfO2/Si,,100... interfaces Deok-Yong Cho, Kee-Shik Park, B.-H. Choi,a  

E-Print Network [OSTI]

like nitrogen.6,7 Among these, Hf-silicide is probably most detrimental since it is metallic and degrades the capacitor performance. Metal- lic Hf-silicide formation has been reported in the interfaceControl of silicidation in HfO2/Si,,100... interfaces Deok-Yong Cho, Kee-Shik Park, B.-H. Choi

Oh, Se-Jung

185

Nitrogen Doping and Thermal Stability in HfSiOxNy Studied by Photoemission and X-ray Absorption Spectroscopy  

SciTech Connect (OSTI)

We have investigated nitrogen-doping effects into HfSiO{sub x} films on Si and their thermal stability using synchrotron-radiation photoemission and x-ray absorption spectroscopy. N 1s core-level photoemission and N K-edge absorption spectra have revealed that chemical-bonding states of N-Si{sub 3-x}O{sub x} and interstitial N{sub 2}-gas-like features are clearly observed in as-grown HfSiO{sub x}N{sub y} film and they decrease upon ultrahigh vacuum (UHV) annealing due to a thermal instability, which can be related to the device performance. Annealing-temperature dependence in Hf 4f and Si 2p photoemission spectra suggests that the Hf-silicidation temperature is effectively increased by nitrogen doping into the HfSiO{sub x} although the interfacial SiO{sub 2} layer is selectively reduced. No change in valence-band spectra upon UHV annealing suggests that crystallization of the HfSiO{sub x}N{sub y} films is also hindered by nitrogen doping into the HfSiO{sub x}.

Toyoda, Satoshi; Okabayashi, Jun; Takahashi, Haruhiko; Oshima, Masaharu; /Tokyo U.; Lee, Dong-Ick; Sun, Shiyu; sun, Steven; Pianetta, Piero A.; /SLAC, SSRL; Ando, Takashi; Fukuda, Seiichi; /SONY, Atsugi

2005-12-14T23:59:59.000Z

186

Interfacial reaction induced phase separation in La{sub x}Hf{sub y}O films  

SciTech Connect (OSTI)

Amorphous La{sub x}Hf{sub y}O films containing La at concentrations (x) of 50 and 20% were prepared by atomic layer deposition on ultrathin SiO{sub 2} films (1 nm). We examined the electronic structures and microstructures of the La{sub x}Hf{sub y}O films by x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS), and x-ray diffraction (XRD). Phase separation into La{sub 2}O{sub 3} and HfO{sub 2} was observed in the La{sub x}Hf{sub y}O films subjected to annealing temperatures over 900 deg. C, although the mixture of La{sub 2}O{sub 3} and HfO{sub 2} is thermodynamically stable. The structural changes that occurred as the result of phase separation were dependent on the concentrations of La and Hf in the films. During the annealing treatment, silicate was produced due to interfacial reactions and the interfacial reactions were found to be dependent on the La{sub 2}O{sub 3} content in the La{sub x}Hf{sub y}O films, which has a significant influence on the phase separation process and resulting film structure.

Ma, J. W.; Lee, W. J.; Cho, M.-H. [Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749 (Korea, Republic of); Lee, K. M.; Sohn, H. C. [Department of Material Science and Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of); Kim, C. S. [Korea Research Institute of Standards and Science, Daejeon 305-540 (Korea, Republic of); Cho, H. J. [Process Development Team, Semiconductor R and D Center, Samsung Electronics Co., LTD, Gyeonggi-Do 449-711 (Korea, Republic of)

2011-06-15T23:59:59.000Z

187

A low temperature fabrication of HfO{sub 2} films with supercritical CO{sub 2} fluid treatment  

SciTech Connect (OSTI)

To improve the dielectric properties of sputter-deposited hafnium oxide (HfO{sub 2}) films, the supercritical CO{sub 2} (SCCO{sub 2}) fluid technology is introduced as a low temperature treatment. The ultrathin HfO{sub 2} films were deposited on p-type (100) silicon wafer by dc sputtering at room temperature and subsequently treated with SCCO{sub 2} fluids at 150 deg. C to diminish the traps in the HfO{sub 2} films. After SCCO{sub 2} treatment, the interfacial parasitic oxide between the Si substrate and HfO{sub 2} layer is only about 5 A, and the oxygen content of the HfO{sub 2} films apparently increased. From current-voltage (I-V) and capacitance-voltage (C-V) measurements, the leakage current density of the SCCO{sub 2}-treated HfO{sub 2} films is repressed from 10{sup -2} to 10{sup -7} A/cm{sup 2} at electric field=3 MV/cm due to the reduction of traps in the HfO{sub 2} films. The equivalent oxide thickness also obviously decreased. Besides, the efficiency of terminating traps is relative to the pressure of the SCCO{sub 2} fluids.

Tsai, C.-T.; Huang, F.-S. [Institute of Electronics Engineering, National Tsing Hua University, HsinChu 300, Taiwan (China); Chang, T.-C. [Department of Physics, Center for Nanoscience and Nanotechnology, National Sun Yat-set University, 70 Lien-hai Road, Kaohsiung 804, Taiwan (China); Institute of Electro-Optical Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan (China); Kin, K.-T. [Industrial Technology Research Institute-Energy and Environment Research Laboratories, Hsinchu 300, Taiwan (China); Liu, P.-T.; Yang, P.-Y. [Department of Photonics and Display Institute, National Chiao Tung University, Hsinchu 300, Taiwan (China); Weng, C.-F. [Department of Physics, Center for Nanoscience and Nanotechnology, National Sun Yat-set University, 70 Lien-hai Road, Kaohsiung 804, Taiwan (China)

2008-04-01T23:59:59.000Z

188

Site preferences of indium impurity atoms in intermetallics having Al3Ti and Al3Zr crystal structures  

E-Print Network [OSTI]

Site preferences of indium impurity atoms in intermetallics having Al3Ti and Al3Zr crystal-04843 (Metals Program) and Praveen Sinha Fund for Physics Research. L12 DO22 DO23 Cu3Au Al3Ti Al3Zr #12;Outline · Indium was doped in samples of Al3V and Al3Ti (Al3Ti structure) and Al3Zr (Al3Zr structure) by arc

Collins, Gary S.

189

Atomistic Studies of Cation Transport in Tetragonal ZrO2 During Zirconium Corrosion  

SciTech Connect (OSTI)

Zirconium alloys are the major fuel cladding materials in current reactors. The water-side corrosion is one of the major degradation mechanisms of these alloys. During corrosion the transport of oxidizing species in zirconium dioxide (ZrO2) determines the corrosion kinetics. Previously it has been argued that the outward diffusion of cation ions is important for forming protective oxides. In this work, the migration of Zr defects in tetragonal ZrO2 is studied with temperature accelerated dynamics and molecular dynamics simulations. The results show that Zr interstitials have anisotropic diffusion and migrate preferentially along the [001] or c direction in tetragonal ZrO2. The compressive stresses can increase the Zr interstitial migration barrier significantly. The migration barriers of some defect clusters can be much lower than those of point defects. The migration of Zr interstitials at some special grain boundaries is much slower than in a bulk oxide. The implications of these atomistic simulation results in the Zr corrosion are discussed.

Xian-Ming Bai; Yongfeng Zhang; Michael R. Tonks

2013-10-01T23:59:59.000Z

190

ZrO sub 2 reinforced-MoSi sub 2 matrix composites  

SciTech Connect (OSTI)

ZrO{sub 2} particle-MoSi{sub 2} matrix composites were fabricated by wet processing/hot pressing, using high quality unstabilized, partially stabilized, and fully stabilized ZrO{sub 2} powders. Composite room temperature indentation fracture toughness increased with increasing volume fraction of ZrO{sub 2} reinforcement. Unstabilized ZrO{sub 2} produced the highest composite fracture toughness, 7.8 MPa m{sup {1/2}} as compared to 2.6 MPa m{sup {1/2}} for pure MoSi{sub 2}. Unstabilized ZrO{sub 2} composites exhibited matrix microcracking, and the spontaneous tetragonal-to-monoclinic ZrO{sub 2} phase transformation induced significant plastic deformation in the MoSi{sub 2} matrix. Partially stabilized ZrO{sub 2} produced a lesser extent of composite fracture toughening, possibly as a result of an inhomogeneous ZrO{sub 2} particle distribution and presence of a glassy phase. 13 refs., 6 figs., 1 tab.

Petrovic, J.J.; Honnell, R.E.; Mitchell, T.E. (Los Alamos National Lab., NM (USA)); Wade, R.K. (Arizona Materials Lab., Tucson, AZ (USA)); McClellan, K.J. (Case Western Reserve Univ., Cleveland, OH (USA). Dept. of Materials Science and Engineering)

1991-01-01T23:59:59.000Z

191

Direct mass measurements of neutron-rich zirconium isotopes up to Zr104  

Science Journals Connector (OSTI)

Atomic masses of radioactive zirconium isotopes from Zr96 to Zr104 have been measured with a relative accuracy of ?5×10?7 using a Penning trap coupled to the ion guide isotope separator on-line system. The obtained two-neutron separation energies show strong local correlation in relation to the shape change and shape coexistence between N=58 and 60.

S. Rinta-Antila; S. Kopecky; V. S. Kolhinen; J. Hakala; J. Huikari; A. Jokinen; A. Nieminen; J. Äystö; J. Szerypo

2004-07-14T23:59:59.000Z

192

E-Print Network 3.0 - as-cast zr ti Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

page cl-733 Summary: par ajout de ZrOz(Y20,) e t de matdriaux monoxydes t e l s que Sic, Tic, TiN e t B4C. Un renforcement... 304 344 247 344 Composite A120,-ZrO,OY-TiN...

193

Transformation plasticity and thermoelastic behavior in ZrO2-containing ceramics  

E-Print Network [OSTI]

565 Transformation plasticity and thermoelastic behavior in ZrO2-containing ceramics A. H. Heuer plasticité de transformation dans ZrO2, qui est responsable de la ré- sistance mécanique et de la grande profit. Dans certaines conditions, cette transformation est réversible, autocatalytique et

Paris-Sud XI, Université de

194

Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. I. microstructure and composition of ZrB2-containing coatings  

Science Journals Connector (OSTI)

To improve the abrasive wear resistance of titanium alloys, ZrB2-containing protective coatings are deposited by electrospark alloying (ESA). As electrode materials, composite ceramics with different amounts of Z...

I. A. Podchernyaeva; A. D. Panasyuk…

2009-05-01T23:59:59.000Z

195

Audit Report: OAS-RA-13-31 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

31 31 Audit Report: OAS-RA-13-31 September 27, 2013 The Department of Energy's Hydrogen and Fuel Cells Program The Department of Energy spent approximately $1 billion over the last 5 years on Hydrogen and Fuel Cells Program activities implemented through various projects at Federal laboratories, universities, non-profit institutions, Government agencies and industry participants. The Department also provided an additional $42 million in American Recovery and Reinvestment Act of 2009 funding to accelerate the commercialization and deployment of fuel cells. We found the Department had not always effectively managed the financial aspects of the Hydrogen and Fuel Cells Program. For instance, we found that the Department approved and reimbursed unsupported and/or unallowable

196

Audit Report: OAS-RA-12-12 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

2 2 Audit Report: OAS-RA-12-12 May 22, 2012 The Department of Energy's Clean Cities Alternative Fuel Vehicle Grant Program Funded under the American Recovery and Reinvestment Act Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Clean Cities Alternative Fuel Vehicle Grant Program (Clean Cities Program) received nearly $300 million, or 30 times its Fiscal Year 2009 funding of approximately $10 million. From this amount, the Department awarded grants ranging from $5 million to $15 million to 25 recipients, including Clean Cities coalitions and other entities that partnered with coalitions. Clean Cities coalitions are volunteer groups that join with public and private sector organizations to promote alternative and renewable fuels, fuel economy measures and new

197

Examination Report: OAS-RA-12-05 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

2-05 2-05 Examination Report: OAS-RA-12-05 January 20, 2012 Saratoga County Economic Opportunity Council, Inc. -Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion to increase the energy efficiency of dwellings owned or occupied by low-income persons. Subsequently, the Department awarded approximately $394 million in a Recovery Act weatherization grant to the State of New York's Division of Housing and Community Renewal. The State of New York allocated about $6.9 million of its grant to Saratoga County Economic Opportunity Council, Inc.

198

Examination Report: OAS-RA-11-20 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

0 0 Examination Report: OAS-RA-11-20 September 30, 2011 People's Equal Action and Community Effort, Inc. -Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 The attached report presents the results of an examination of the People's Equal Action and Community Effort, Inc. (PEACE), Weatherization Assistance Program (Weatherization Program) under the American Recovery and Reinvestment Act of 2009 (Recovery Act). The Office of Inspector General (OIG) contracted with an independent certified public accounting firm, Otis and Associates, PC (Otis), to express an opinion on the agency's compliance with Federal and State laws, regulations and program guidelines applicable to the Weatherization Program. The Recovery Act was enacted to stimulate the economy and encourage

199

Audit Report: OAS-RA-12-13 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

3 3 Audit Report: OAS-RA-12-13 June 25, 2012 The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Ohio Under the American Recovery and Reinvestment Act of 2009, the Department of Energy's Weatherization Assistance Program (Weatherization Program) received $5 billion to increase the energy efficiency of dwellings owned or occupied by low-income persons. The Department awarded a 3-year, $267 million Recovery Act weatherization grant to the State of Ohio's (Ohio) Department of Development. Ohio had not always managed its Weatherization Program efficiently and effectively. We identified weaknesses that impacted Ohio's ability to meet the objectives of the Weatherization Program and the Recovery Act.

200

Audit Report: OAS-RA-10-06 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

6 6 Audit Report: OAS-RA-10-06 April 1, 2010 Accounting and Reporting for the American Recovery and Reinvestment Act by the Department of Energy's Funding Recipients The American Recovery and Reinvestment Act of 2009 (Recovery Act) was established to jumpstart the U.S. economy, create or save millions of jobs, and invest in the Nation's energy future. The Department of Energy received approximately $37 billion through the Recovery Act to support a variety of science, energy and environmental initiatives. The Office of Management and Budget (OMB) issued guidance for carrying out stimulus-related activities which requires, among other things, that recipients ensure funds provided by the Recovery Act are clearly distinguishable from non-Recovery Act funds in all reporting systems and that recipients' actions are transparent to

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Examination Report: OAS-RA-13-11 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 1 Examination Report: OAS-RA-13-11 February 19, 2013 Fresno County Economic Opportunities Commission Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act) the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of California received $186 million in Recovery Act Weatherization Program funding, of which $11.2 million was allocated to the Fresno County Economic Opportunities Commission (Agency) to weatherize 5,374 homes. The State of California Department of Community Services and Development (State) was responsible

202

Audit Report: OAS-RA-L-11-01 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 1 Audit Report: OAS-RA-L-11-01 November 10, 2010 Management of the Plutonium Finishing Plant Closure Project The Department of Energy's (Department) Richland Operations Office (Richland) awarded a contract, effective October 1, 2008, to CH2M HILL Plateau Remediation Company (CHPRC) to remediate the Hanford Site's Central Plateau. Part of the contract's scope includes completion of the Plutonium Finishing Plant (PFP) Closure Project - a major decontamination and demolition project of an industrial complex consisting of more than 60 buildings. CHPRC's contract included expectations to: Provide safe and compliant storage of special nuclear material at PFP until it has been removed from the PFP complex; Operate and maintain the PFP facilities and associated waste sites, structures, systems and equipment in a safe,

203

Audit Report: OAS-RA-11-17 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

7 7 Audit Report: OAS-RA-11-17 September 19, 2011 The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Tennessee The Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion under the American Recovery and Reinvestment Act of 2009 to improve the energy efficiency of the homes of low-income individuals, of which the State of Tennessee received a three-year Weatherization Program grant of $99 million. We initiated this audit to determine if Tennessee had adequate safeguards in place to ensure that the Weatherization Program was managed efficiently and effectively. We found that Tennessee, while achieving its production goals, had not

204

Audit Report: OAS-RA-10-02 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 2 Audit Report: OAS-RA-10-02 December 3, 2009 Management Alert on the Department's Monitoring of the Weatherization Assistance Program in the State of Illinois Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's Weatherization Assistance Program received $5 billion to improve the energy efficiency of homes owned or occupied by low income persons, reduce their total residential expenditures, and improve their health and safety. Since the Recovery Act was enacted in February 2009, the Department has awarded weatherization grants to every state, the District of Columbia and five territories. Because of the unprecedented level of funding and the risks associated with spending vast amounts of money in a relatively short period of time, the Office of Inspector General

205

Audit Report: OAS-RA-L-11-13 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 3 Audit Report: OAS-RA-L-11-13 September 30, 2011 The 12 GeV CEBAF Upgrade Project at Thomas Jefferson National Accelerator Facility In September 2008, the Department of Energy's (Department) Office of Science approved a construction project to double the electron beam energy of the Continuous Electron Beam Accelerator Facility at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory) from 6 to 12 billion electron volts (GeV). We found that the 12 GeV Upgrade Project (Upgrade Project) generally complied with the American Recovery Act and Reinvestment Act of 2009 requirements we tested and was, for the most part, on schedule. However, we identified several opportunities to strengthen project monitoring and control. Specifically, we found that: 1)

206

Audit Report: OAS-RA-L-11-04 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

L-11-04 L-11-04 Audit Report: OAS-RA-L-11-04 March 2, 2011 The Department's Infrastructure Modernization Projects under the Recovery and Reinvestment Act of 2009 The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted on February 17, 2009. The goals of the Recovery Act are to retain or create jobs, increase economic efficiency, and invest in infrastructure that will provide long-term economic benefits. The Recovery Act provided just over $36 billion for the Department of Energy (Department), including $198 million to be used by the Office of Science (Science) for infrastructure modernization initiatives. According to Science officials, modernization was needed to many Department laboratories, offices, and other facilities due to their age. Science's Recovery Act Infrastructure

207

Audit Letter Report: OAS-RA-L-10-09 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

9 9 Audit Letter Report: OAS-RA-L-10-09 August 27, 2010 Office of Science's Energy Frontier Research Centers In 2008, the Department of Energy's (Department) Office of Science (Science) issued a Funding Opportunity Announcement seeking applications from the scientific community for the establishment of Energy Frontier Research Centers (EFRCs). The purpose of the EFRCs is to integrate the talent and expertise of leading scientists to accelerate the rate of scientific breakthroughs needed to create advanced energy technologies for the 21st century. The EFRCs are to pursue the fundamental understanding necessary to meet the global need for abundant, clean, and economical energy. The EFRC research areas include solar energy, electricity storage, materials sciences, biofuels, advanced nuclear systems, and carbon capture

208

Audit Report: OAS-RA-10-10 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

0 0 Audit Report: OAS-RA-10-10 May 25, 2010 Waste Processing and Recovery Act Acceleration Efforts for Contact-Handled Transuranic Waste at the Hanford Site The Department of Energy's Office of Environmental Management's (EM), Richland Operations Office (Richland), is responsible for disposing of the Hanford Site's (Hanford) transuranic (TRU) waste, including nearly 12,000 cubic meters of radioactive contact-handled TRU wastes. Prior to disposing of this waste at the Department's Waste Isolation Pilot Plant (WIPP), Richland must certify that it meets WIPP's waste acceptance criteria. To be certified, the waste must be characterized, screened for prohibited items, treated (if necessary) and placed into a satisfactory disposal container. In a February 2008 amendment to an existing Record of Decision (Decision),

209

Audit Report: OAS-RA-L-12-02 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

2 2 Audit Report: OAS-RA-L-12-02 January 12, 2012 Recovery Act Funded Projects at the Lawrence Berkeley National Laboratory In February 2009, the President signed the American Recovery and Reinvestment Act of 2009 (Recovery Act) into law. The goals of the Recovery Act were to retain and create jobs, increase economic efficiency, and invest in infrastructure that would provide long-term economic benefits. The Department of Energy's (Department) Office of Science received $1.6 billion through the Recovery Act which it used to invest in various projects. The Lawrence Berkeley National Laboratory (Berkeley) received approximately $333.4 million in Recovery Act funds, primarily from the Department for infrastructure upgrades and a broad array of research efforts. These funds were allocated to 130

210

Audit Report: OAS-RA-10-08 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

8 8 Audit Report: OAS-RA-10-08 April 27, 2010 The Department of Energy's Program to Assist Federal Buyers in the Purchasing of Energy Efficient Products The American Recovery and Reinvestment Act of 2009 (Recovery Act) established a series of energy-related goals, one of which was to make Federal facilities more energy efficient. The Department of Energy (Department) plays an integral part in this process. The Department's Federal Energy Management Program (FEMP), established in 1973, helps Federal agencies achieve energy efficiency and conservation goals by developing and publishing energy efficiency specifications. According to FEMP, Federal agencies spend approximately $10 billion a year to purchase energy consuming products and have the opportunity to save well over $200

211

Audit Letter Report: OAS-RA-L-10-04 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

4 4 Audit Letter Report: OAS-RA-L-10-04 April 27, 2010 Progress in Implementing the Advanced Batteries and Hybrid Components Program under the American Recovery and Reinvestment Act The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted to stimulate the U.S. economy, create jobs and make infrastructure investments in energy and other areas. The Department of Energy's (Department) Advanced Battery and Hybrid Components Program (Program) received almost $2 billion to support the construction of U.S. based manufacturing plants to produce batteries and electric drive components. While the Department had funded some vehicle battery research in the past, this Program adds a new manufacturing component that the Department must administer. The Program is managed by the Office of Energy Efficiency and

212

Audit Report: OAS-RA-12-04 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

4 4 Audit Report: OAS-RA-12-04 January 20, 2012 The Department's Management of the Smart Grid Investment Grant Program The Energy Independence and Security Act of 2007 charged the Department of Energy (Department) with establishing the Smart Grid Investment Grant (SGIG) program. More recently, the American Recovery and Reinvestment Act of 2009 (Recovery Act) provided the Department's Office of Electricity Delivery and Energy Reliability with $3.5 billion to fund the SGIG program and to assist in modernizing the Nation's power grid. The SGIG program was to facilitate the installation of state-of-the-art information technologies and, ultimately, improve grid reliability and enable consumers to reduce the amount of energy used. The program required that the

213

Examination Report: OAS-RA-13-18 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

8 8 Examination Report: OAS-RA-13-18 April 18, 2013 Travis County Health & Human Services and Veterans Services Weatherization Assistance Program Funds Provided by the ARRA of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of Texas received $327 million in Weatherization Program Recovery Act grant funding, of which $8.9 million was allocated to Travis County Health & Human Services and Veterans Services (Travis County) to weatherize approximately 1,060 homes. The State of Texas' Department of Housing and Community Affairs (Texas) was

214

Examination Report: OAS-RA-13-21 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 1 Examination Report: OAS-RA-13-21 May 14, 2013 South Carolina Energy Office - Energy Efficiency and Conservation Block Grant Program Funds Provided by the American Recovery and Reinvestment Act of 2009 The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted to promote economic prosperity through job creation and encourage investment in the Nation's energy future. As part of the Recovery Act, the Energy Efficiency and Conservation Block Grant (EECBG) Program received about $3.2 billion to assist in implementing strategies to reduce fossil fuel emissions, decrease total energy use of local governments, improve energy efficiency and create jobs. The South Carolina Energy Office (SCEO) is responsible for operating the State of South Carolina's energy efficiency programs and for administering

215

Examination Report: OAS-RA-13-17 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7 7 Examination Report: OAS-RA-13-17 March 28, 2013 Community Action Partnership of San Bernardino County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of California received $186 million in Recovery Act Weatherization Program funding, of which $7.7 million was allocated to the Community Action Partnership of San Bernardino County (San Bernardino) to weatherize 1,931 homes. The State of California Department of Community Services and Development (California)

216

Examination Report: OAS-RA-11-21 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

1 1 Examination Report: OAS-RA-11-21 September 30, 2011 Action for a Better Community, Inc. - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion to increase the energy efficiency of dwellings owned or occupied by low-income persons. Subsequently, the Department awarded approximately $394.6 million in a Recovery Act weatherization grant to the State of New York's Division of Housing and Community Renewal. The State of New York allocated about $7.45 million of its grant to Action for a Better Community, Inc. (ABC), to

217

Audit Report: OAS-RA-11-05 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 Audit Report: OAS-RA-11-05 March 22, 2011 The Department of Energy's Geothermal Technologies Programunder the American Recovery and Reinvestment Act Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's Geothermal Technologies Program received $400 million to promote the exploration and development of new geothermal fields and innovative research into advanced geothermal technologies. This funding represents an almost ten-fold increase over the $44 million originally appropriated to the Geothermal Technologies Program for 2009. As of January 2011, the Department had awarded $368 million in financial assistance agreements for 135 geothermal technologies projects, with about $68 million having been expended. Recovery Act funding supports geothermal projects

218

Audit Report: OAS-RA-10-07 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

7 7 Audit Report: OAS-RA-10-07 April 9, 2010 Management Alert on Environmental Management's Select Strategy for Disposition of Savannah River Site Depleted Uranium Oxides The Administration and the Congress, through policy statements and passage of the American Recovery and Reinvestment Act of 2009 (Recovery Act), have signaled that they hope that proactive actions by agency Inspectors General will help ensure that Federal Recovery Act activities are transparent, effective and efficient. In that context, the purpose of this management alert is to share with you concerns that have been raised to the Office of Inspector General regarding the planned disposition of the Savannah River Site's (SRS) inventory of Depleted Uranium (DU) oxides. This inventory, generated as a by-product of the nuclear weapons production process and

219

Audit Report: OAS-RA-13-28 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

8 8 Audit Report: OAS-RA-13-28 July 18, 2013 Costs Incurred by Selected Tribal Energy Efficiency and Conservation Block Grant Recipients Under the American Recovery and Reinvestment Act of 2009, the Department of Energy's (Department) Energy Efficiency and Conservation Block Grant (EECBG) Program received $3.2 billion to improve energy efficiency and reduce energy use and fossil fuel emissions. The Department's Office of Energy Efficiency and Renewable Energy allocated about $2.7 billion of the funds using a population-driven formula to over 2,000 entities including states and territories, cities and counties, and Native American tribes. The Navajo Tribal Utility Authority (NTUA), the Cherokee Nation, Muscogee Creek Nation, Choctaw Nation of Oklahoma, and Chickasaw Nation received the

220

Audit Report: OAS-RA-12-11 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

1 1 Audit Report: OAS-RA-12-11 May 10, 2012 The Department of Energy's Transportation Electrification Program The Department of Energy (Department) established the Transportation Electrification Program (Program) to demonstrate and evaluate the deployment of plug-in hybrid vehicles and their associated infrastructure needs. Funded by the American Recovery and Reinvestment Act of 2009, the Program provided about $400 million to 18 grant recipients-12 non-profit entities and 6 for-profit entities. The grants are intended to further the development of the plug-in hybrid electric vehicle industry in the United States; ensure achievement of the President's goal to have one million of these vehicles on the road by 2015; and, create thousands of jobs. We found that the Department could improve its financial management of the

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Examination Report: OAS-RA-11-19 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

19 19 Examination Report: OAS-RA-11-19 September 29, 2011 Cuyahoga County of Ohio Department of Development - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion to increase the energy efficiency of dwellings owned or occupied by low-income persons. Subsequently, the Department awarded a 3-year, $267 million Recovery Act weatherization grant to the State of Ohio's Department of Development (Ohio or State). The State of Ohio allocated about $9.4 million of its grant to the Cuyahoga County of Ohio Department of Development (County) to

222

Special Report: OAS-RA-12-03 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

03 03 Special Report: OAS-RA-12-03 January 18, 2012 Lessons Learned/Best Practices during the Department of Energy's Implementation of the American Recovery and Reinvestment Act of 2009 The American Recovery and Reinvestment Act of 2009 (Recovery Act) was signed into law on February 17, 2009 as a way to jumpstart the U.S. economy, create or save millions of jobs, spur technological advances in science and health, and invest in the Nation's energy future. As part of the Recovery Act, the Department of Energy (Department) received more than $35 billion to support a number of science, energy, and environmental initiatives. In addition, the Department noted that its authority to make or guarantee energy-related loans increased to as much as $52 billion. From an Inspector General perspective, the intensive ramp-up and execution

223

Audit Report: OAS-RA-11-03 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 3 Audit Report: OAS-RA-11-03 November 30, 2010 The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act for the City of Phoenix - Agreed-Upon Procedures The attached report presents the results of an agreed-upon procedures review of the Department of Energy's (Department) Weatherization Assistance Program in the City of Phoenix, Arizona, under the American Recovery and Reinvestment Act of 2009 (Recovery Act). The Office of Inspector General (OIG) engaged an independent certified public accounting firm, Lopez and Company, to perform the agreed-upon procedures for Phoenix, a sub-recipient of the Department's Recovery Act Weatherization funding for the State of Arizona. The Recovery Act was enacted to promote economic prosperity

224

Examination Report: OAS-RA-13-04 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

4 4 Examination Report: OAS-RA-13-04 November 8, 2012 The Department of Energy's American Recovery and Reinvestment Act Energy Efficiency and Conservation Block Grant Program - Efficiency Maine Trust The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted to promote economic prosperity through job creation and encourage investment in the Nation's energy future. As part of the Recovery Act, the Energy Efficiency and Conservation Block Grant (EECBG) Program received about $3.2 billion to assist in implementing strategies to reduce fossil fuel emissions, decrease total energy use of local governments, improve energy efficiency and create jobs. The State of Maine established the Efficiency Maine Trust (Trust) to take over responsibility for all

225

Audit Report: OAS-RA-11-07 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7 7 Audit Report: OAS-RA-11-07 June 6, 2011 The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the State of Wisconsin The Department of Energy's Weatherization Assistance Program (Weatherization Program) received $5 billion under the American Recovery and Reinvestment Act of 2009 (Recovery Act) to improve the energy efficiency of homes, multi-family rental units and mobile homes owned or occupied by low-income persons. Subsequently, the Department awarded a 3-year Weatherization Program grant for $141.5 million to the State of Wisconsin (Wisconsin). This grant provided an eight-fold increase in funds available to Wisconsin for weatherization compared to the $15 million that was authorized in Fiscal Year (FY) 2009. Wisconsin's Department of

226

Audit Report: OAS-RA-L-12-03 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

3 3 Audit Report: OAS-RA-L-12-03 January 26, 2012 The Department of Energy's American Recovery and Reinvestment Act - Arizona State Energy Program The Department of Energy (Department) allocated $55.4 million in SEP funds under the American Recovery and Reinvestment Act of 2009 (Recovery Act) to the State of Arizona (Arizona) in support of energy priorities through the State Energy Program (SEP). These funds were allocated to grants for energy savings and renewable energy projects, such as retrofits for schools, public buildings and non-profit organizations, and renewable energy products manufactured in Arizona. We found that Arizona had developed a number of processes and controls to accomplish the objectives of the SEP and the Recovery Act. For example, Arizona established a plan

227

Audit Letter Report: OAS-RA-L-10-02 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 2 Audit Letter Report: OAS-RA-L-10-02 April 16, 2010 Audit of Fermi National Accelerator Laboratory's NOvA Project The NuMI Off-Axis electron neutrino (ve) Appearance (NOvA) experiment is a neutrino physics research project conducted by the Office of Science's Fermi National Accelerator Laboratory (Fermilab). The goal of the NOvA experiment is to advance the understanding of neutrino particles. Fermilab, in coordination with the University of Minnesota (University), must complete an accelerator and detector system needed for the experiment. Fermilab is upgrading its accelerator complex to increase beam power and constructing a 220 ton "Near Detector" that will monitor the neutrino beam as it leaves Fermilab. The University is responsible for constructing a

228

Examination Report: OAS-RA-13-12 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

2 2 Examination Report: OAS-RA-13-12 February 19, 2013 City of Los Angeles - Energy Efficiency and Conservation Block Grant Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Energy Efficiency and Conservation Block Grant (EECBG) Program received $3.2 billion to develop, promote, implement and manage energy efficiency and conservation projects and programs designed to reduce fossil fuel emissions, reduce total energy use of the eligible entities, and improve energy efficiency in the transportation, building and other appropriate sectors. In July 2009, the Department of Energy (Department) awarded the City of Los Angeles (City) a 3-year formula grant of $37

229

Examination Report: OAS-RA-L-12-07 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

L-12-07 L-12-07 Examination Report: OAS-RA-L-12-07 September 20, 2012 The Department of Energy's American Recovery and Reinvestment Act - Ohio State Energy Program The Department of Energy's State Energy Program (SEP) provides grants to states, territories and the District of Columbia (states) to support their energy priorities and fund projects that meet their unique energy needs. The American Recovery and Reinvestment Act of 2009 (Recovery Act) significantly expanded the SEP by providing an additional $3.1 billion for state projects. The State of Ohio's, Ohio Department of Development (ODOD) was allocated $96.1 million in SEP funds under the Recovery Act. The Office of Inspector General contracted with an independent certified public accounting firm, Otis & Associates, PC (Otis), to perform the

230

Audit Report: OAS-RA-L-13-01 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

1 1 Audit Report: OAS-RA-L-13-01 November 1, 2012 Implementation of the Department of Energy's Concentrating Solar Power Program The Department of Energy's (Department) Office of Energy Efficiency and Renewable Energy's Concentrating Solar Power Program is intended to broaden the use of concentrating solar power by making the technology cost competitive in the conventional power market. The Department plans to achieve this goal through cost-shared contracts with private industry, as well as facilitating advanced research at its national laboratories. Concentrating solar power technologies concentrate the sun's energy and convert it to heat which is then used to drive an engine or turbine to produce electrical power. The audit found that the Department had

231

Examination Report: OAS-RA-13-02 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

2 2 Examination Report: OAS-RA-13-02 October 9, 2012 County of Los Angeles - Energy Efficiency and Conservation Block Grant Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Energy Efficiency and Conservation Block Grant (EECBG) Program received $3.2 billion to develop, promote, implement and manage energy efficiency and conservation projects and programs designed to reduce fossil fuel emissions, reduce total energy use of the eligible entities, and improve energy efficiency in the transportation, building and other appropriate sectors. The County of Los Angeles (County) received a $15.4 million formula grant award and a $30 million competitive grant award, both awards were to be

232

Audit Letter Report: OAS-RA-L-10-03 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

3 3 Audit Letter Report: OAS-RA-L-10-03 April 23, 2010 Audit of Moab Mill Tailings Cleanup Project The Moab Uranium Mill Tailings Remedial Action Project (Moab Project) is located at a former uranium-ore processing facility near Moab, Utah on the west bank of the Colorado River. In 2005, the Department of Energy (Department) issued a Record of Decision to relocate, by rail, approximately 16 million tons of uranium mill tailings from that location to a disposal site 30 miles away in Crescent Junction, Utah. In June 2008, the Department awarded a $92 million contract, with approximately $6 million in available fee, to EnergySolutions to construct the necessary infrastructure, upgrade the rail lines, and begin the transportation of mill tailings to Crescent Junction. Under the terms of the contract,

233

Audit Letter Report: OAS-RA-L-10-05 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

5 5 Audit Letter Report: OAS-RA-L-10-05 August 12, 2010 Decommissioning and Demolition Activities at Office of Science Sites In February 2009, the President signed the American Recovery and Reinvestment Act of 2009 (Recovery Act) into law. The Department of Energy's (Department) Office of Environmental Management (EM) allocated $140 million of Recovery Act funds to decommission and demolish (D&D) Office of Science facilities at Argonne National Laboratory (Argonne) and to accelerate ongoing D&D activities at Brookhaven National Laboratory (Brookhaven). D&D activities funded at Argonne included the demolition of Buildings 330 and 310, the removal of wastes and nuclear material from another building, and the removal of the majority of the remote-handled and

234

Special Report: OAS-RA-12-14 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

14 14 Special Report: OAS-RA-12-14 August 28, 2012 Inquiry into the Procurement of Law Firm Services and Management of Law Firm-Disclosed Organizational Conflicts of Interest by the Department of Energy's Loan Programs Office We received anonymous complaints alleging various improprieties in the Loan Programs Office related to the procurement of legal services and the management of law firm disclosed conflicts of interest in the Innovative Technology Loan Guarantee Program (Program). In response, we initiated a special inquiry to review the circumstances surrounding the allegations. Our inquiry did not substantiate the specific allegations outlined in the complaint. Absent additional information, we plan no further action regarding the original allegations. We did, however, identify

235

Audit Report: OAS-RA-13-16 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

6 6 Audit Report: OAS-RA-13-16 March 28, 2013 The Department of Energy's American Recovery and Reinvestment Act Energy Efficiency and Conservation Block Grant Program-State of Colorado and County of Boulder As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Energy Efficiency and Conservation Block Grant Program received $3.2 billion to develop, promote, implement and manage energy efficiency and conservation projects and programs designed to reduce fossil fuel emissions, reduce total energy use of the eligible entities, and improve energy efficiency in the transportation, building and other appropriate sectors. The Department of Energy (Department) awarded a $9.6 million formula grant to the State of Colorado (Colorado) in September 2009, and a

236

Special Report: OAS-RA-13-10 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

3-10 3-10 Special Report: OAS-RA-13-10 February 8, 2013 The Department of Energy's Management of the Award of a $150 Million Recovery Act Grant to LG Chem Michigan Inc The Department of Energy's Vehicle Technologies Program was established to develop and deploy efficient and environmentally friendly highway transportation technologies to reduce the Nation's dependence on foreign oil and provide greater energy security. The Vehicle Technologies Program received $2.4 billion under the American Recovery and Reinvestment Act of 2009 (Recovery Act) for these purposes. In February 2010, LG Chem Michigan Inc. (LG Chem Michigan), formerly Compact Power, Inc., was awarded more than $150 million in Recovery Act funding to help construct a $304 million battery cell manufacturing plant in Holland, Michigan. On October

237

Special Report: OAS-RA-L-12-01 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

L-12-01 L-12-01 Special Report: OAS-RA-L-12-01 November 28, 2011 Special Inquiry on the Office of the Chief Financial Officer's Information Technology Expenditures The Office of Inspector General (OIG) received a complaint on April 13, 2011, through the OIG Hotline alleging the waste of appropriated Fiscal Year 2010 and American Recovery and Reinvestment Act of 2009 (Recovery Act) funds by senior officials within the Office of the Chief Financial Officer (OCFO). Information alleged included the mismanagement of over $6 million worth of software contracts and user licenses. Specifically, the complaint reported issues with the procurement and implementation of the Market Allocation Modeling Effort (MarkAl), the Multi-Attribute Decision Model (MADA), Microsoft's SharePoint, the @Risk software, and the

238

Audit Report: OAS-RA-13-07 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7 7 Audit Report: OAS-RA-13-07 January 17, 2013 The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the State of Maryland The Department of Energy's (Department) Weatherization Assistance Program received $5 billion under the American Recovery and Reinvestment Act of 2009 (Recovery Act) to improve the energy efficiency of residences owned or occupied by low-income persons. The Department subsequently awarded a 3-year Recovery Act Weatherization Assistance Program (Weatherization Program) grant of $61.4 million to the State of Maryland (Maryland or State) to weatherize 6,850 homes. This grant provided over eight times the approximately $7.4 million in Weatherization funds made available to

239

Audit Report: OAS-RA-14-02 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

14-02 14-02 Audit Report: OAS-RA-14-02 November 25, 2013 The Department of Energy's American Recovery and Reinvestment Act Energy Efficiency and Conservation Block Grant Program - District of Columbia The Department of Energy's Energy Efficiency and Conservation Block Grant (EECBG) Program received about $3.2 billion under the American Recovery and Reinvestment Act of 2009 to help state and local entities develop, implement and manage energy efficiency and conservation projects. Of the funding provided, more than $2.7 billion was distributed to over 2,000 entities using a population-driven formula. The Department allocated about $9.6 million in December 2009 to the District of Columbia government through the District Department of the Environment (DDOE). DDOE selected

240

Special Report: OAS-RA-10-01 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

10-01 10-01 Special Report: OAS-RA-10-01 October 21, 2009 The Department of Energy's Quality Assurance Process for Prime Recipients' Reporting for the American Recovery and Reinvestment Act of 2009 The American Recovery and Reinvestment Act of 2009 (Recovery Act) was established to jumpstart the U.S. economy, create or save millions of jobs, spur technological advances in health and science, and invest in the Nation's energy future. The Department of Energy (Department) will receive an unprecedented $37 billion in Recovery Act funding to support a variety of science, energy, and environmental initiatives. The majority of the funding received by the Department will be allocated to various recipients through grants, cooperative agreements, contracts, and other financial

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Audit Report: OAS-RA-13-08 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

13-08 13-08 Audit Report: OAS-RA-13-08 January 10, 2013 The Department of Energy's $700 Million Smart Grid Demonstration Program Funded through the American Recovery and Reinvestment Act of 2009 The Department of Energy's (Department) Office of Electricity Delivery and Energy Reliability received about $4.5 billion under the American Recovery and Reinvestment Act of 2009 (Recovery Act) to enhance the reliability and resilience of the Nation's power grid, or nearly 33 times the amount appropriated in Fiscal Year 2009. Of the amount awarded, the Department allocated nearly $700 million to the Smart Grid Demonstration Program (Program) to fund 32 regional demonstrations and energy storage projects. The Program also provided supplemental Recovery Act funding to 10 existing

242

Audit Report: OAS-RA-L-11-04 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

4 4 Audit Report: OAS-RA-L-11-04 March 2, 2011 The Department's Infrastructure Modernization Projects under the Recovery and Reinvestment Act of 2009 The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted on February 17, 2009. The goals of the Recovery Act are to retain or create jobs, increase economic efficiency, and invest in infrastructure that will provide long-term economic benefits. The Recovery Act provided just over $36 billion for the Department of Energy (Department), including $198 million to be used by the Office of Science (Science) for infrastructure modernization initiatives. According to Science officials, modernization was needed to many Department laboratories, offices, and other facilities due to their age. Science's Recovery Act Infrastructure

243

Examination Report: OAS-RA-13-05 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 Examination Report: OAS-RA-13-05 January 17, 2013 Prince George's County Department of Housing and Community Development - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act) the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of Maryland (State) Department of Housing and Community Development received $61 million in Recovery Act Weatherization Program funding, of which $2.1 million was allocated to the Prince George's County Department of Housing and Community Development (County). The State was responsible for administering

244

Audit Report: OAS-RA-12-07 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

7 7 Audit Report: OAS-RA-12-07 April 6, 2012 The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the State of New York Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion to increase the energy efficiency of dwellings owned or occupied by low-income persons. Subsequently, the Department awarded approximately $394 million in a Recovery Act weatherization grant to the State of New York (New York). New York's Weatherization Program is administered by the Division of Housing and Community Renewal (DHCR) through 74 local entities. New York's goal is to weatherize approximately 45,000 units with Recovery Act

245

Audit Report: OAS-RA-13-15 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 Audit Report: OAS-RA-13-15 March 21, 2013 The Department of Energy's Industrial Carbon Capture and Storage Program Funded by the American Recovery and Reinvestment Act The Department of Energy (Department) received nearly $1.5 billion through the American Recovery and Reinvestment Act of 2009 (Recovery Act) to invest in clean industrial technologies and sequestration projects through the Industrial Carbon Capture and Storage Program (Carbon Program). The National Energy Technology Laboratory awarded 46 cooperative agreements to a variety of demonstration and research and development projects. The agreements required substantial involvement by Federal project managers and relied on recipients to share in the investments needed to complete the projects. The audit found that the Department had not always effectively

246

Audit Report: OAS-RA-13-26 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6 6 Audit Report: OAS-RA-13-26 June 19, 2013 Department of Energy's Interconnection Transmission Planning Program Funded through the American Recovery and Reinvestment Act of 2009 Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Office of Electricity Delivery and Energy Reliability received about $4.5 billion to modernize the electric grid. About $80 million of this funding was designated for the Interconnection Transmission Planning Program to facilitate the development or strengthening of capabilities in each interconnection. The transmission infrastructure in the United States is separated into three distinct electrical networks, or interconnections - the Western, Eastern, and Texas interconnections. The Department allocated $60 million to five

247

Alpha-Decay Studies of the N=127 Isotones Fr214, Ra215, and Ac216  

Science Journals Connector (OSTI)

The study of nuclei which are one neutron removed from the N=126 closed shell has shown that the odd-proton N=127 isotones ? decay from both the ground state and a metastable state whose excitation energy decreases between Bi210 and Ac216. The ?-decay daughters of these nuclei show some correspondence in their energy-level spacings which is due to the coupling of specific single-particle configurations near the N=126 closed shell. New information has been obtained for the ? decay of the 1 - isomer of Fr214 to levels in At210, and for the ? decay of Ac216 to levels in Fr212. The decay scheme of Ac216 is markedly different from that reported by others. An experimental and theoretical study of the ? decay of Ra215 has also been made.

David F. Torgerson and Ronald D. Macfarlane

1970-12-01T23:59:59.000Z

248

The Department's Management of the Smart Grid Investment Grant Program, OAS-RA-12-04  

Broader source: Energy.gov (indexed) [DOE]

Management of Management of the Smart Grid Investment Grant Program OAS-RA-12-04 January 2012 Department of Energy Washington, DC 20585 January 20, 2012 MEMORANDUM FOR THE SECRETARY FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Audit Report on "The Department's Management of the Smart Grid Investment Grant Program" INTRODUCTION AND OBJECTIVE The Energy Independence and Security Act of 2007 charged the Department of Energy with establishing the Smart Grid Investment Grant (SGIG) program. More recently, the American Recovery and Reinvestment Act of 2009 (Recovery Act) provided the Department's Office of Electricity Delivery and Energy Reliability (OE) with $3.5 billion to fund the SGIG program and to assist in modernizing the Nation's power grid. The SGIG program was to facilitate the

249

Audit Report: OAS-RA-L-11-11 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

1 1 Audit Report: OAS-RA-L-11-11 September 23, 2011 The Department of Energy's Energy Efficiency and Conservation Block Grant Program Funded under the American Recovery and Reinvestment Act for the State of Pennsylvania Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Energy Efficiency and Conservation Block Grant Program (Program) received $3.2 billion in funding to help U.S. cities, counties and states to develop, promote, implement and manage energy efficiency and conservation projects. Subsequently, the Department awarded a $23.6 million formula grant to the State of Pennsylvania's (State) Department of Environmental Protection (DEP). Of the $23.6 million awarded, the State retained about $1.2 million in funding for

250

The Hydrogen Energy California Project, OAS-RA-13-22  

Broader source: Energy.gov (indexed) [DOE]

Hydrogen Energy California Hydrogen Energy California Project OAS-RA-13-22 June 2013 Department of Energy Washington, DC 20585 June 6, 2013 MEMORANDUM FOR THE ACTING DEPUTYASSISTANT SECRETARY FOR CLEAN COAL DIRECTOR FOR POLICY, OFFICE OF ACQUISITION AND PROJECT MANAGEMENT FROM: David Sedillo Director, Western Audits Division Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Hydrogen Energy California Project" BACKGROUND Under the American Recovery and Reinvestment Act of 2009, the Department of Energy's (Department) Office of Fossil Energy received $3.4 billion to focus on the research, development and deployment of technologies to use coal more cleanly and efficiently. In September 2009, the Department approved a cooperative agreement award with a Government contribution of $308

251

Examination Report: OAS-RA-13-03 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 3 Examination Report: OAS-RA-13-03 October 17, 2012 Community Action Partnership of Orange County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 As part of the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Weatherization Assistance Program (Weatherization Program) received $5 billion to reduce energy consumption for low-income households through energy efficient upgrades. The State of California received $186 million in Recovery Act Weatherization Program funding, of which $7.3 million was allocated to the Community Action Partnership of Orange County (Agency) to weatherize 2,342 homes. The State of California Department of Community Services and Development was responsible for administering

252

Audit Report: OAS-RA-L-13-02 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

2 2 Audit Report: OAS-RA-L-13-02 December 3, 2012 The Department's Implementation of Financial Incentive Programs under the Energy Efficiency and Conservation Block Grant Program The Department of Energy's (Department) Energy Efficiency and Conservation Block Grant (EECBG) Program, funded for the first time by the American Recovery and Reinvestment Act of 2009 (Recovery Act), was intended to help US cities, counties and states develop, promote, implement and manage energy efficiency and conservation projects. The EECBG Program received $3.2 billion in Recovery Act funding for competitive and formula grants. Of the $3.2 billion, approximately $284 million was designated by EECBG recipients for financial incentive programs. The Department had taken a number of positive steps to implement and administer EECBG financial

253

Audit Report: OAS-RA-13-25 | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 Audit Report: OAS-RA-13-25 June 18, 2013 The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the State of Michigan Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion to improve the energy efficiency of residences owned or occupied by low-income persons. The Department subsequently awarded a Recovery Act Weatherization Program grant of over $250 million to the State of Michigan, which included an additional Recovery Act award of nearly $7 million of Sustainable Energy Resources for Consumers funding. This grant provided roughly 10 times the $26 million

254

Audit Report: OAS-RA-11-08 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

8 8 Audit Report: OAS-RA-11-08 April 22, 2011 Management Alert on Planned Actions Related to the National Energy Technology Laboratory's Simulation-Based Engineering User Center The Department of Energy's National Energy Technology Laboratory (NETL) initiated plans to utilize $20 million of American Recovery and Reinvestment Act of 2009 funds to develop the Simulation-Based Engineering User Center (User Center) - part of the Carbon Capture Simulation Initiative program. According to project documentation, $3 million of the total cost will be dedicated to acquiring and installing a Performance Optimized Data Center (POD) at NETL's Morgantown, West Virginia, site. And, the remaining funds will be spent equipping and supporting the POD with a high performance computing system. In March 2011, NETL was given final

255

Special Report: OAS-RA-09-01 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

09-01 09-01 Special Report: OAS-RA-09-01 March 20, 2009 Special Report on "The American Recovery and Reinvestment Act at the Department of Energy The American Recovery and Reinvestment Act of 2009 (Recovery Act) was signed into law on February 17, 2009, as a way to jumpstart the U.S. economy, create or save millions of jobs, spur technological advances in science and health,and invest in the Nation's energy future. This national effort will require an unprecedented level of transparency and accountability to ensure that U.S. citizens know where their taxdollars are going and how they are being spent. As part of the Recovery Act, the Department of Energy will receive more than $38 billion to support a number of science, energy, and environmental initiatives. Additionally, the

256

Effect of high-energy milling on hydrogen desorption and the structure of mixtures of Zr-containing materials  

Science Journals Connector (OSTI)

Mass-spectrometric investigations of hydrogen liberation from the mixture of powders 3ZrO0.2Hx + ZrFe2, the overall composition of which corresponds to Zr4Fe2O0.6Hx, after its treatment by ball milling for 5 and ...

I. Yu. Zavalii; M. Yurchyk; O. M. Vovk; I. V. Saldan; I. V. Koval’chuk

2005-11-01T23:59:59.000Z

257

Combustion Processes in the Zr-Co-H2 System and Synthesis of Hydrides of Intermetallic Compounds  

Science Journals Connector (OSTI)

The researches on Zr2Co, ZrCo, ZrCo2 synthesis and hydriding in a self-propagating hightemperature synthesis — SHS mode are carried out. In IMC — hydrogen systems low temperature (350–500°C) and high temperature ...

H. G. Hakobyan; S. K. Dolukhanyan

2002-01-01T23:59:59.000Z

258

ZrO sub 2 and ZrO sub 2 /SiC particle reinforced-MoSi sub 2 matrix composites  

SciTech Connect (OSTI)

ZrO{sub 2}-MoSi{sub 2} and ZrO{sub 2}/SiC-MoSi{sub 2} composites were fabricated by hot pressing and hot pressing/HIP at 1700{degrees}C. No reactions between ZrO{sub 2}, SiC, and MoSi{sub 2} were observed. An amorphous silica glassy phase was present in all composites. Composites with unstabilized ZrO{sub 2} particles exhibited the highest room temperature fracture toughness, reaching a level three times that of pure MoSi{sub 2}. Both the room temperature toughness and 1200{degrees}C strength of ZrO/{sub 2}SiC-MoSi{sub 2} composites were higher than ZrO{sub 2}-MoSi{sub 2} composites, indicating beneficial effects of combined reinforcement phases. Low strength levels were observed at 1400{degrees}C due to the presence of the silica glassy phase. Elimination of glassy phases and refinements in microstructural homogeneity are processing routes important to the optimization of the mechanical properties of these types of composites. 18 refs., 7 figs.

Petrovic, J.J.; Bhattacharya, A.K.; Honnell, R.E.; Mitchell, T.E. (Los Alamos National Lab., NM (United States)); Wade, R.K. (Arizona Materials Lab., Tucson, AZ (United States)); McCellan, K.J. (Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering)

1991-01-01T23:59:59.000Z

259

EFFECT OF AGING ON THE PHASE TRANSFORMATION AND MECHANICAL BEHAVIOR OF Ti36Ni49Hf15 HIGH  

E-Print Network [OSTI]

and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China (Received August 19 the microstructure, transformation temperature, mechanical properties and shape memory effects (SMEs) for Ti36Ni49Hf

Zheng, Yufeng

260

Human Factors Process Failure Mode and Effects Analysis (HF PFMEA) Application in the Evaluation of Management Risks  

E-Print Network [OSTI]

.3.1. Mechanisms of Prevention ............................................................................................... 11 2.4. Human Factors Process Failure Mode and Effects Analysis (HF PFMEA) ....................... 11 2.5. FMEA Components... ........................................................................................... 15 2.5.5. Risk Priority Number ....................................................................................................... 17 2.6. FMEA Model...

Soguilon, Nenita M.

2009-12-18T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Electronic properties of InP (001)/HfO{sub 2} (001) interface: Band offsets and oxygen dependence  

SciTech Connect (OSTI)

Using ab-initio methods, atomic structures and electronic properties of InP (001)/HfO{sub 2} (001) interface are studied within the framework of density functional theory. We examine the InP/HfO{sub 2} model interface electronic structures under varying oxidation conditions. The effects of indium and phosphorous concentrations on interfacial bonding, defect states, band offsets, and the thermodynamic stability at the interface are also investigated. The origin of interfacial gap states in InP (001)/HfO{sub 2} (001) interface are proposed, mainly from the P-rich oxides, which is validated by our experimental work. This highlights the importance of surface passivation prior to high-? deposition based on the in situ spectroscopic results of atomic layer deposition of HfO{sub 2} on InP.

KC, Santosh; Dong, Hong; Longo, Roberto C.; Xiong, Ka [Department of Materials Science and Engineering, The University of Texas at Dallas, Richardson, Texas 75080 (United States); Wang, Weichao [Department of Electronics and Microelectronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300071 (China); Wallace, Robert M.; Cho, Kyeongjae, E-mail: kjcho@utdallas.edu [Department of Materials Science and Engineering, The University of Texas at Dallas, Richardson, Texas 75080 (United States); Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080 (United States)

2014-01-14T23:59:59.000Z

262

Initial phases in sputter deposited HfO{sub 2}-Al{sub 2}O{sub 3} nanolaminate films  

SciTech Connect (OSTI)

Nanolaminate films of crystalline HfO{sub 2} and amorphous Al{sub 2}O{sub 3} were grown by reactive sputter deposition on unheated fused SiO{sub 2} and the surface oxide of <111> Si. X-ray diffraction showed the amount of monoclinic (m) HfO{sub 2} decreased with decreasing HfO{sub 2} layer thickness, consistent with a finite crystal size effect. High resolution transmission electron microscopy of individual crystallites detected tetragonal (t) and orthorhombic (o) HfO{sub 2} as the initial phases formed. Whereas the t{yields}m transition is accomplished by a shear mechanism, we demonstrate the important role of polysynthetic twinning for the o{yields}m transition.

Hoppe, E. E.; Aita, C. R.; Gajdardziska-Josifovska, M. [Advanced Coatings Experimental Laboratory, University of Wisconsin-Milwaukee, P.O. Box 784, Milwaukee, Wisconsin 53201 (United States); Department of Physics and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

2007-11-12T23:59:59.000Z

263

Enhanced electrical characteristics of Au nanoparticles embedded in high-k HfO{sub 2} matrix  

SciTech Connect (OSTI)

We present experimental results for laser-induced Au nanoparticle (NP) embedded in a HfO{sub 2} high-k dielectric matrix. Cross-sectional transmission electron microscopy images showed that the Au NPs of 8 nm in diameter were clearly embedded in HfO{sub 2} matrix. Capacitance-voltage measurements of Pt/HfO{sub 2}/Au NPs/HfO{sub 2} on p-type Si substrate reliably exhibited metal-oxide-semiconductor behavior with a large flatband shift of 4.7 V. In addition, the charge retention time at room temperature was found to exceed 10{sup 5} h. This longer time was attributed to the higher electron barrier height via high work function of the Au NP.

Yang, Jung Yup; Kim, Ju Hyung; Choi, Won Joon; Do, Young Ho; Kim, Chae Ok; Hong, Jin Pyo [New Functional Materials and Devices Laboratory, Department of Physics, Hanyang University, Seoul 133-791 (Korea, Republic of)

2006-09-15T23:59:59.000Z

264

Reversed spin polarization at the Co(001)-HfO2(001) interface  

Science Journals Connector (OSTI)

Ab initio electronic-structure calculations on the Co(001)-HfO2(001) interface are reported. The spin polarization of conduction electrons is positive at the interface, i.e., it is reversed with respect to the spin polarization in bulk Co. The electronic structure is very sensitive to the interface structure; without atomic relaxations the reversed spin polarization is not found. The possible relation with spin-polarized tunneling and magnetoresistance is discussed.

P. K. de Boer; G. A. de Wijs; R. A. de Groot

1998-12-15T23:59:59.000Z

265

Reactive ion beam etching of HfO{sub 2} film and removal of sidewall redeposition  

SciTech Connect (OSTI)

Comparative studies on ion beam etching (IBE) and reactive ion beam etching (RIBE) of HfO{sub 2} film have been carried out using photoresist as the masking layer. The etching rates of HfO{sub 2} film and photoresist mask in pure Ar and Ar/CHF{sub 3} mixture plasmas were measured as a function of ion energy, plasma composition, and ion beam incident angle. It has been found that the RIBE with Ar/CHF{sub 3} plasma is capable of lowering the threshold energy of ion beam and increasing sputtering yield, compared to the IBE with pure Ar. The redeposition of photoresist sidewall is a major issue, due to the formation of nonvolatile etching products during sputtering of HfO{sub 2} film in both IBE and RIBE. However, the sidewall redeposition can be easily removed in HCl solutions with assistance of ultrasonic wave for RIBE with Ar/CHF{sub 3} plasma. Alternatively, the sidewall redeposition can be eliminated by controlling the slope of photoresist sidewall or combined with ion incident angle.

Wang Xudi; Liu Ying; Xu Xiangdong; Fu Shaojun; Cui Zheng [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026 (China) and School of Mechanical and Automobile Engineering, Hefei University of Technology, Hefei 230009 (China); National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026 (China); Central Microstructure Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX (United Kingdom)

2006-07-15T23:59:59.000Z

266

Gate Metal-Induced Diffusion and Interface Reactions in Hf Oxide Films on Si  

SciTech Connect (OSTI)

When metal electrodes are deposited on a high-{kappa} metal-oxide/SiO{sub 2}/Si stack, chemical interactions may occur both at the metal/high-{kappa} and the high-{kappa}/Si interfaces, causing changes in electrical performance. We report here results from medium energy ion scattering (MEIS) and x-ray photoelectron (XPS) studies of oxygen and silicon transport and interfacial layer reactions in multilayer gate stacks. Our results show that Ti deposition on HfO{sub 2}/SiO{sub 2}/Si stacks causes reduction of the SiO{sub 2} interfacial layer and (to a lesser extent) the HfO{sub 2} layer. Silicon atoms initially present in the interfacial SiO{sub 2} layer incorporate into the bottom of the high-{kappa} layer. Some evidence for titanium-silicon interdiffusion through the high-{kappa} film in the presence of a titanium gate in crystalline HfO{sub 2} films is also reported.

Goncharova, Lyudmila V.; Dalponte, Mateus; Celik, Ozgur; Garfunkel, Eric; Gustafsson, Torgny [Departments of Physics and Chemistry, and Laboratory for Surface Modification, Rutgers University, Piscataway, NJ 08854 (United States); Lysaght, Pat S.; Bersuker, Gennadi I. [Sematech, Austin, Texas 78741 (United States)

2007-09-26T23:59:59.000Z

267

Phase stability and elastic properties of C15 compounds HfV{sub 2}+Nb  

SciTech Connect (OSTI)

The ternary phase diagram of Hf-V-Nb system has been established and the C15 and C14 Laves phase regions located. The structural stability of the cubic Laves phase HfV{sub 2}+Nb was examined using heat capacity measurements and transmission electron microscopy. It is found that the binary C 15 has a martensitic transformation at 115K and that Nb addition can eliminate the martensitic transformation and stabilize the C15 structure. The elastic properties vs. temperature of the C15 HfV{sub 2}+Nb were studied using the resonant ultrasound technique. It is observed that the shear and Young`s moduli increase abnormally with increasing temperature, the bulk modulus is virtually constant, and the Poisson`s ratio is very high and decreases abnormally with increasing temperature. The elastic properties of the C15 compound can be qualitatively understood using the electronic structure obtained from ab initio calculations. The relation between the phase stability and anomalous elastic properties is discussed based on these results.

Chu, F.; Mitchell, T.E. [Los Alamos National Lab., NM (United States); Pope, D.P. [Pennsylvania Univ., Philadelphia, PA (United States). Dept. of Materials Science and Engineering

1994-10-01T23:59:59.000Z

268

Impact of titanium addition on film characteristics of HfO{sub 2} gate dielectrics deposited by atomic layer deposition  

SciTech Connect (OSTI)

The impact of 8-to 45-at. % Ti on physical and electrical characteristics of atomic-layer-deposited and annealed hafnium dioxide was studied using vacuum-ultraviolet spectroscopic ellipsometry, secondary ion mass spectroscopy, transmission electron microscopy, atomic force microscopy, x-ray diffraction, Rutherford backscattering spectroscopy, x-ray photoelectron spectroscopy, and x-ray reflectometry. The role of Ti addition on the electrical performance is investigated using molybdenum (Mo)-gated capacitors. The film density decreases with increasing Ti addition. Ti addition stabilizes the amorphous phase of HfO{sub 2}, resulting in amorphous films as deposited. After a high-temperature annealing, the films transition from an amorphous to a polycrystalline phase. Orthorhombic Hf-Ti-O peaks are detected in polycrystalline films containing 33-at. % or higher Ti content. As Ti content is decreased, monoclinic HfO{sub 2} becomes the predominant microstructure. No TiSi is formed at the dielectric/Si interface, indicating films with good thermal stability. The band gap of Hf-Ti-O was found to be lower than that of HfO{sub 2}. Well-behaved capacitance-voltage and leakage current density-voltage characteristics were obtained for Hf-Ti-O. However, an increased leakage current density was observed with Ti addition. The data from capacitance-voltage stressing indicate a smaller flatband voltage (V{sub fb}) shift in the HfO{sub 2} films with low Ti content when compared with the HfO{sub 2} films. This indicates less charge trapping with a small amount of Ti addition.

Triyoso, D.H.; Hegde, R.I.; Zollner, S.; Ramon, M.E.; Kalpat, S.; Gregory, R.; Wang, X.-D.; Jiang, J.; Raymond, M.; Rai, R.; Werho, D.; Roan, D.; White, B.E. Jr.; Tobin, P.J. [Freescale Semiconductor, Inc., Advanced Products Research and Development Laboratory, 3501 Ed Bluestein Boulevard, Austin, Texas 78721 (United States)

2005-09-01T23:59:59.000Z

269

Chemical analysis of HfO{sub 2}/Si (100) film systems exposed to NH{sub 3} thermal processing  

SciTech Connect (OSTI)

Nitrogen incorporation in HfO{sub 2}/SiO{sub 2} films utilized as high-k gate dielectric layers in advanced metal-oxide-semiconductor field effect transistors has been investigated. Thin HfO{sub 2} blanket films deposited by atomic layer deposition on either SiO{sub 2} or NH{sub 3} treated Si (100) substrates have been subjected to NH{sub 3} and N{sub 2} anneal processing. Several high resolution techniques including electron microscopy with electron energy loss spectra, grazing incidence x-ray diffraction, and synchrotron x-ray photoelectron spectroscopy have been utilized to elucidate chemical composition and crystalline structure differences between samples annealed in NH{sub 3} and N{sub 2} ambients as a function of temperature. Depth profiling of core level binding energy spectra has been obtained by using variable kinetic energy x-ray photoelectron spectroscopy with tunable photon energy. An 'interface effect' characterized by a shift of the Si{sup 4+} feature to lower binding energy at the HfO{sub 2}/SiO{sub 2} interface has been detected in the Si 1s spectra; however, no corresponding chemical state change has been observed in the Hf 4f spectra acquired over a broad range of electron take-off angles and surface sensitivities. The Si 2p spectra indicate Si-N bond formation beneath the HfO{sub 2} layer in the samples exposed to NH{sub 3} anneal. The NH{sub 3} anneal ambient is shown to produce a metastable Hf-N bond component corresponding to temperature driven dissociation kinetics. These findings are consistent with elemental profiles across the HfO{sub 2}/Si(100) interface determined by electron energy loss spectroscopy measurements. X-ray diffraction measurements on similarly treated films identify the structural changes resulting from N incorporation into the HfO{sub 2} films.

Lysaght, Patrick S.; Barnett, Joel; Bersuker, Gennadi I.; Woicik, Joseph C.; Fischer, Daniel A.; Foran, Brendan; Tseng, Hsing-Huang; Jammy, Raj [Front End Process Division, SEMATECH, 2706 Montopolis Drive, Austin, Texas 78741-6499 (United States); National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Physical Characterization Laboratory, Advanced Technology Development Facility, 2706 Montopolis Drive, Austin, Texas 78741-6499 (United States); Front End Process Division, SEMATECH, 2706 Montopolis Drive, Austin, Texas 78741-6499 (United States)

2007-01-15T23:59:59.000Z

270

Electronic Structures of C28H4 and Hf@C28H4 and Their Ions. SCF Calculations  

Science Journals Connector (OSTI)

In our calculations, we use the ab initio restricted Hartree?Fock (SCF) and configuration interaction (CI) methods to study the electronic structure respectively excluding and including electron correlation and the spin?orbit interaction. ... Systems of Calculation. ... The molecular integrals were calculated once for C28H4 (or Hf@C28H4) and stored on disk for all the SCF calculations of the neutral molecule and ions of C28H4 (or Hf@C28H4). ...

Debbie Fu-Tai Tuan; Russell M. Pitzer

1996-04-11T23:59:59.000Z

271

25. Bialecki RA, Ostrowski ZP, Kassab AJ, Yin Q, Sciubba E (2002) Coupling FEM, BEM, and analyti-  

E-Print Network [OSTI]

(such as iron) form permanent magnets or are attracted to magnets. An everyday example of ferromagnetism25. Bialecki RA, Ostrowski ZP, Kassab AJ, Yin Q, Sciubba E (2002) Coupling FEM, BEM, and analyti, a ferrimagnetic mate- rial is one in which the magnetic moments of the atoms on different sublattices are opposed

Qin, Qinghua

272

An experimental and numerical study of surface tension-driven melt flow R.A. Parsons a,, F. Nimmo a  

E-Print Network [OSTI]

An experimental and numerical study of surface tension-driven melt flow R.A. Parsons a,, F. Nimmo 2007 Abstract To determine the role of surface tension-driven melt migration in planetary bodies, we, surface tension causes the melt to relax back to a homogeneous distribution. Samples composed of 76 vol

Nimmo, Francis

273

Microfluidics for block polymer shells (DMR 0819860) SEED :H.A. Stone, R.A. Register and Janine Nunes  

E-Print Network [OSTI]

Microfluidics for block polymer shells (DMR 0819860) SEED :H.A. Stone, R.A. Register and Janine. We utilized microfluidic methods to investigate the role of geometric structures, e.g. thin spherical, microfluidic devices with two consecutive flow-focusing junctions were used to generate air bubble

Petta, Jason

274

Electron-Transport Properties of Amorphous (Zr0.64ni0.36)1-Xalx Alloys  

E-Print Network [OSTI]

-4242 (Received 28 November 1988; revised manuscript received 16 March 1989) Measurements of the electrical resistivity p(T), thermopower S(T), and Hall coe%cient RH for a series of rapidly quenched Zr-Ni-Al alloys are reported for concentrations from x =0 to 0...-metal or ?metalloid amorphous alloys, the sign of RH can change from positive to negative as the concentration of the early transition metal is decreased. This is particular- ly well illustrated by measurements on amorphous Zr- based alloys, Zr-Cu, ' ' Zr-Ni, ' Zr...

BHATNAGAR, AK; PAN, R.; Naugle, Donald G.

1989-01-01T23:59:59.000Z

275

Etching characteristics of high-k dielectric HfO{sub 2} thin films in inductively coupled fluorocarbon plasmas  

SciTech Connect (OSTI)

Inductively coupled fluorocarbon (CF{sub 4}/Ar and C{sub 4}F{sub 8}/Ar) plasmas were used to etch HfO{sub 2}, which is a promising high-dielectric-constant material for the gate of complementary metal-oxide-semiconductor devices. The etch rates of HfO{sub 2} in CF{sub 4}/Ar plasmas exceeded those in C{sub 4}F{sub 8}/Ar plasmas. The tendency for etch rates to become higher in fluorine-rich (high F/C ratio) conditions indicates that HfO{sub 2} can be chemically etched by fluorine-containing species. In C{sub 4}F{sub 8}/Ar plasmas with a high Ar dilution ratio, the etch rate of HfO{sub 2} increased with increasing bias power. The etch rate of Si, however, decreased with bias power, suggesting that the deposition of carbon-containing species increased with increasing the power and inhibited the etching of Si. The HfO{sub 2}/Si selectivity monotonically increased with increasing power, then became more than 5 at the highest tested bias power. The carbon-containing species to inhibit etching of Si play an important role in enhancing the HfO{sub 2}/Si selectivity in C{sub 4}F{sub 8}/Ar plasmas.

Takahashi, Kazuo; Ono, Kouichi; Setsuhara, Yuichi [Department of Aeronautics and Astronautics, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501 (Japan)

2005-11-15T23:59:59.000Z

276

Iron self-diffusion in amorphous FeZr?Fe57Zr multilayers measured by neutron reflectometry  

Science Journals Connector (OSTI)

Self-diffusion of iron in Fe67naturalZr33?Fe6757Zr33 multilayers has been investigated by neutron reflectometry. The as-deposited multilayer is amorphous in nature. It remains amorphous up to a temperature of 573K and thereafter nanocrystallizes with an average grain size of 6nm. The self-diffusion in the multilayers has been measured after isothermal vacuum annealing below the nanocrystallization temperature by monitoring the decay of the intensity of the first order Bragg peak, arising due to the isotopic periodicity. It has been found that the diffusivity at different temperatures follows an Arrhenius-type behavior with the preexponential factor D0=5×10?18±1m2s?1 and the activation energy E=0.38±0.05eV, respectively. These values of E and D0 follow the well-known E–D0 correlation and on the basis of this correlation it is suggested that diffusion mechanism in the present case is not highly collective but involves a rather small group of atoms.

Mukul Gupta; Ajay Gupta; J. Stahn; M. Horisberger; T. Gutberlet; P. Allenspach

2004-11-18T23:59:59.000Z

277

Effects of N{sub 2}, O{sub 2}, and Ar plasma treatments on the removal of crystallized HfO{sub 2} film  

SciTech Connect (OSTI)

The effects of plasma treatment using Ar, N{sub 2}, and O{sub 2} on the removal of crystallized HfO{sub 2} films in a dilute HF solution were studied. The resulting damage in source and drain regions, and recess in isolation regions were also investigated. It was found that plasma nitridation with an ion energy of several hundred electron volts can lower the wet etch resistance of crystallized HfO{sub 2} films up to 70 A thick through the generation of Hf-N bonds. However, thermal nitridation did not introduce sufficient nitrogen into bulk crystallized HfO{sub 2} films to lower wet etch resistance. Plasma nitridation without bias power introduced nitrogen to the crystallized HfO{sub 2} in the region only within 10 A of the surface. The enhancement of the etch rate of crystallized HfO{sub 2} in dilute HF and the amount of recess in the active and isolation regions using N{sub 2}, O{sub 2}, and Ar plasma treatment have been evaluated. Results show that N{sub 2} plasma treatment is the most effective in enhancing the removal rate of crystallized HfO{sub 2} in dilute HF and minimizing recess on substrate among the plasmas studied.

Chen Jinghao; Yoo, Won Jong; Chan, Daniel S.H. [Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 (Singapore)

2006-01-15T23:59:59.000Z

278

The structural and mechanical properties of a Cu??Zr??(at. %) alloy processed by High-Velocity-Injection (HVI)  

E-Print Network [OSTI]

) cooling rate, (3) defects and/or defect structure, (4) density and, (5) purity. The samples investigated in this research will be a copper- zirconium alloy of composition Cu Zr (at. ?) . This alloy was chosen because it is a member of a group...+Zr, C E6 8220C 4~0. 2 a~Zr, Cu 3200 2800 u 2600 ur 2400 g O 2200 ~ 2000 ~ i800 ~ l 600 i 100'C piZrCu3 965'C 935'C 895 C )I Sar I I g 47 92PC ~ 'C 1 400 Zr, cu $ ZrCu R O ZrCu~+Cu l200 lO 20 30 40 50 60 70 80 90 l00 WEIGHT...

Hays, Charles C.

2012-06-07T23:59:59.000Z

279

Identification of a quasiparticle band in very neutron-rich Zr104  

Science Journals Connector (OSTI)

The high spin levels of a very neutron-rich Zr104 nucleus have been reinvestigated by measuring the prompt ? rays in the spontaneous fission of Cf252. The ground-state band has been confirmed. A new sideband has been identified with a band-head energy at 1928.7 keV. The projected shell model is employed to investigate the band structure of Zr104. The results of calculated levels are in good agreement with the experimental data, and suggest that the new band in Zr104 may be based on the neutron ?5/2-[532]??3/2+[411] configuration.

E. Y. Yeoh (???); S. J. Zhu (???); J. H. Hamilton; A. V. Ramayya; Y. X. Liu (???); Y. Sun (??); J. K. Hwang; S. H. Liu; J. G. Wang (???); Y. X. Luo; J. O. Rasmussen; I. Y. Lee; H. B. Ding (???); L. Gu (??); Q. Xu (??); Z. G. Xiao (???)

2010-08-10T23:59:59.000Z

280

Quantitative phase analysis of Mg:ZrO{sub 2} nanoparticles by Rietveld refinement method  

SciTech Connect (OSTI)

To quantify the structural phases of nanocrystalline ZrO{sub 2} doped with Mg ions of varying concentrations (3, 5, 10, 15 and 20%) and annealed at different temperatures. Magnesia doped zirconia was prepared by chemical co-precipitation method and annealed up to 1000°C. The monoclinic and tetragonal phases present in Mg:ZrO{sub 2} were quantified using Rietveld refinement analysis of the X-ray diffraction data and compared with the Direct method based on peak intensity calculations. Tetragonal phase was dominant in the 600°C annealed Mg:ZrO{sub 2} for all Mg concentrations.

Balaji, V., E-mail: thangadurai.p@gmail.com; Senthilkumaran, S., E-mail: thangadurai.p@gmail.com; Thangadurai, P., E-mail: thangadurai.p@gmail.com [Center for Nano Science and Technology, Pondicherry University, Puducherry- 605014 (India)

2014-04-24T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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281

Microsoft PowerPoint - IPRC 2012-Zr behavior  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Behavior Behavior of Zirconium Oxide and Zirconium Metal in a LiCl-Li 2 O-Based Electrolytic Reduction System S. D. Herrmann, L. A. Wurth, N. J. Gese August 27, 2012 2012 International Pyroprocessing Research Conference The Abbey Resort Fontana, Wisconsin Introduction  Background - An electrometallurgical treatment process has been operating since 1996 to treat 25 MTHM of sodium-bonded uranium metal blanket and uranium metal alloy driver fuel from Experimental Breeder Reactor - II (EBR-II) at Idaho National Laboratory's Fuel Conditioning Facility. - In the course of retrieving EBR-II spent driver fuel for treatment, a significant quantity of degraded U-10Zr spent fuels, i.e., breached fuel exposed to air, has accumulated since 1996. - As oxidized material, it would require head-end treatment prior to electrorefining. - Electrolytic reduction is a candidate head-end treatment

282

The analysis of Ytrium doped BaZrO3  

Office of Scientific and Technical Information (OSTI)

Project Title: Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells Project Title: Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells Report Title: Computational modeling, synthesis, and characterization of BaZr 1-x Y x O 3-δ solid state proton conductor. Type of Report: Semi-Annual Technical Progress Report Reporting Period Start Date: March 30, 2003 Reporting Period End Date: September 30, 2003 Principle Authors: Boris Merinov, Claudio O. Dorso, William A. Goddard III, Jian Wu, and Sossina Haile Date Report was Issued: October 30, 2003 DOE Award Number: DE-FC26-02NT41631 Name and Address of Submitting Organization: California Institute of Technology, mail code 139- 74, 1200 E. California Blvd., Pasadena, CA 91125 1 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States

283

Pygmy dipole resonance and dipole polarizability in 90 Zr  

Science Journals Connector (OSTI)

Electric dipole (E1) reduced transition probability B(E1) of 90 Zr was obtained by the inelastic proton scattering near 0 degrees using a 295 MeV proton beam and multipole decomposition analysis of the angular distribution by the distorted-wave Born approximation with the Hartree-Fock plus random-phase approximation model and inclusion of El Coulomb excitation and the E1 strength of the pygmy dipole resonance was found in the vicinity of the neutron threshold in the low-energy tail of the giant dipole resonance. Using the data we plan to determine the precise dipole polarizability ?D which is defined as an inversely energy-weighted sum value of the elecrric dipole strength. The dipole polarizability is expected to constrain the symmetry energy term of the neutron matter equation of state. Thus systematical measurement of the dipole polarizability is important.

C. Iwamoto; A. Tamii; H. Utsunomiya; H. Akimune; H. Nakada; T. Shima; T. Hashimoto; T. Yamagata; T. Kawabata; Y. Fujita; H. Matsubara; T. Suzuki; H. Fujita; Y. Shimbara; M. Nagashima; M. Sakuda; T. Mori; T. Izumi; A. Okamoto; T. Kondo; T.-W. Lui; B. Bilgier; H. C. Kozer; K. Hatanaka

2014-01-01T23:59:59.000Z

284

Calculations of parity-nonconserving s-d amplitudes in Cs, Fr, Ba+, and Ra+  

Science Journals Connector (OSTI)

We have performed ab initio mixed-states and sum-over-states calculations of parity-nonconserving (PNC) electric dipole (E1) transition amplitudes between s-d electron states of Cs, Fr, Ba+, and Ra+. For the lower states of these atoms we have also calculated energies, E1 transition amplitudes, and lifetimes. We have shown that PNC E1 amplitudes between s-d states can be calculated to high accuracy. Contrary to the Cs 6s-7s transition, in these transitions there are no strong cancellations between different terms in the sum-over-states approach. In fact, there is one dominating term which deviates from the sum by less than 20%. This term corresponds to an s-p1/2 weak matrix element, which can be calculated with an accuracy of better than 1%, and a p1/2-d3/2 E1 transition amplitude, which can be measured. Also, the s-d amplitudes are about four times larger than the corresponding s-s amplitudes. We have shown that by using a hybrid mixed-states–sum-over-states approach the accuracy of the calculations of PNC s-d amplitudes could compete with that of Cs 6s-7s if p1/2-d3/2 E1 amplitudes are measured to high accuracy.

V. A. Dzuba; V. V. Flambaum; J. S. M. Ginges

2001-05-08T23:59:59.000Z

285

Model for Simulation of Hydride Precipitation in Zr-Based Used Fuel  

Broader source: Energy.gov (indexed) [DOE]

for Simulation of Hydride Precipitation in Zr-Based Used Fuel for Simulation of Hydride Precipitation in Zr-Based Used Fuel Claddings: A Status Report on Current Model Capabilities Model for Simulation of Hydride Precipitation in Zr-Based Used Fuel Claddings: A Status Report on Current Model Capabilities The report demonstrates a meso-scale, microstructural evolution model for simulation of zirconium hydride precipitation in the cladding of used fuels during long-term dry-storage. While the Zr-based claddings (regarded as a barrier for containment of radioactive fission products and fuel) are manufactured free of any hydrogen, they absorb hydrogen during service in the reactor. The amount of hydrogen that the cladding picks up is primarily a function of the exact chemistry and microstructure of the claddings and reactor operating conditions, time-temperature history, and

286

Phase studies of the Zr-H system at high hydrogen concentrations  

Science Journals Connector (OSTI)

The phase boundaries of the Zr-H system have been defined at high hydrogen concentrations, on the basis of studies performed on zirconium hydrides containing 4 at % uranium. The methods used include hightemperature X-ray diffraction, electrical resistance, dilatometry, and, to a limited extent, hot stage microscopy. The (?+?) two-phase region was found to exist between ZrH1.64 and ZrHi1.74 at 24 °C. This region diminishes in width with increasing temperature and closes at 455 °C and ZrH1.70. From this point, a single boundary, sloping toward higher hydrogen concentrations, separates the ? and ? single-phase regions. Precise lattice parameter measurements indicate that first-order transitions occur at the boundaries of the two-phase region. Theoretical considerations suggest that the ? ? ? transition is second order.

K.E. Moore; W.A. Young

1968-01-01T23:59:59.000Z

287

Analysis of the electronic structure of ZrO{sub 2} by Compton spectroscopy  

SciTech Connect (OSTI)

The electronic structure of ZrO{sub 2} is studied using the Compton scattering technique. The first-ever Compton profile measurement on polycrystalline ZrO{sub 2} was obtained using 59.54 keV gamma-rays emanating from the {sup 241}Am radioisotope. To explain the experimental data, we compute theoretical Compton profile values using the method of linear combination of atomic orbitals in the framework of density functional theory. The correlation scheme proposed by Perdew-Burke-Ernzerhof and the exchange scheme of Becke are considered. The ionic-model-based calculations for a number of configurations, i.e., Zr{sup +x}(O{sup -x/2}){sub 2} (0 {<=} x {<=} 2), are also performed to estimate the charge transfer on compound formation, and the study supports transfer of 1.5 electrons from Zr to O atoms.

Mahammad, F. M.; Mahammed, S. F. [University of Tikrit 42, Department of Physics (Iraq)] [University of Tikrit 42, Department of Physics (Iraq); Kumar, R.; Vijay, Y. K.; Sharma, B. K. [University of Rajasthan, Department of Physics (India)] [University of Rajasthan, Department of Physics (India); Sharma, G., E-mail: gsphysics@gmail.com [University of Kota, Department of Pure and Applied Physics (India)

2013-07-15T23:59:59.000Z

288

Morphology and mechanism study for the synthesis of ZrB{sub 2}–SiC powders by different methods  

SciTech Connect (OSTI)

ZrB{sub 2}–SiC ceramics, whose SiC is generally incorporated into the system by mechanical mixing, are known to have better performance than monolithic ZrB{sub 2}. Therefore, synthesis of duplex ZrB{sub 2}–SiC powders is beneficial for improving sinterability and mechanical properties of ZrB{sub 2}–SiC composites. In the present work, ZrB{sub 2}–SiC duplex powders with different morphologies were synthesized at 1550 °C for 2 h using as-synthesized amorphous hydrous ZrO{sub 2}–SiO{sub 2}. Both precipitation and sol–gel methods were used to prepare ZrO{sub 2}–SiO{sub 2} precursors. ZrB{sub 2}–SiC powder derived from precipitation method presented a rod-like morphology with smaller irregular particles adhering to them. And the morphology from sol–gel method was equiaxed shape with a very uniform distribution for principal components of Zr and Si. - Graphical abstract: SEM images of the ZrB2-SiC powders obtained by different methods. Display Omitted - Highlights: • ZrB{sub 2}–SiC powders with different morphologies were synthesized. • Precipitation and sol–gel methods were used to prepare ZrO{sub 2}–SiO{sub 2} precursors. • Possible mechanisms of morphology formation were investigated. • This work provided a potential way of morphology control for raw powders. • The synthesized duplex powders achieved a uniform distribution of SiC in ZrB{sub 2}.

Zhao, Bin; Zhang, Yun [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191 (China); Li, Junping [Aerospace Research Institute of Materials and Processing Technology, No. 1 Nan Da Hong Men Road, Fengtai District, Beijing 100076 (China); Yang, Biyun; Wang, Tingyu; Hu, Yongzhen; Sun, Dongfeng [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191 (China); Li, Ruixing, E-mail: ruixingli@yahoo.com [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191 (China); Yin, Shu [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); Feng, Zhihai [Aerospace Research Institute of Materials and Processing Technology, No. 1 Nan Da Hong Men Road, Fengtai District, Beijing 100076 (China); Sato, Tsugio [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)

2013-11-15T23:59:59.000Z

289

Process and properties of electroless Ni-Cu-P-ZrO{sub 2} nanocomposite coatings  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer The Ni-P and Ni-P-Cu-ZrO{sub 2} coatings were produced by electroless technique. Black-Right-Pointing-Pointer The influence of copper and ZrO{sub 2} nanoparticles on Ni-P was studied. Black-Right-Pointing-Pointer Surface morphology, structure and electrochemical behavior were evaluated. Black-Right-Pointing-Pointer The Ni-Cu-P-ZrO{sub 2} and Ni-P-ZrO{sub 2} coatings are more resistant to corrosion than Ni-P. Black-Right-Pointing-Pointer Introduction of Cu and ZrO{sub 2} in the matrix aids to the enhancement of microhardness. -- Abstract: Electroless Ni-Cu-P-ZrO{sub 2} composite coating was successfully obtained on low carbon steel matrix by electroless plating technique. Coatings with different compositions were obtained by varying copper as ternary metal and nano sized zirconium oxide particles so as to obtain elevated corrosion resistant Ni-P coating. Microstructure, crystal structure and composition of deposits were analyzed by SEM, EDX and XRD techniques. The corrosion behavior of the deposits was studied by anodic polarization, Tafel plots and electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution. The ZrO{sub 2} incorporated Ni-P coating showed higher corrosion resistance than plain Ni-P. The introduction of copper metal into Ni-P-ZrO{sub 2} enhanced the protection ability against corrosion. The influence of copper metal and nanoparticles on microhardness of coatings was evaluated.

Ranganatha, S. [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India)] [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Venkatesha, T.V., E-mail: drtvvenkatesha@yahoo.co.uk [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Vathsala, K. [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)] [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)

2012-03-15T23:59:59.000Z

290

Oxygen impurity and microalloying effect in a Zr-based bulk metallic glass alloy  

E-Print Network [OSTI]

Oxygen impurity and microalloying effect in a Zr-based bulk metallic glass alloy C.T. Liu*, M composition Zr­10 at.%Al­5% Ti­17.9% Cu­14.6% Ni (BAM-11) was used to study the effects of oxygen impurities and microalloying on the microstructure and mechanical properties. Oxygen impurity at a level of 3000 appm

Pennycook, Steve

291

Mechanisms and selectivity for etching of HfO{sub 2} and Si in BCl{sub 3} plasmas  

SciTech Connect (OSTI)

The authors have investigated plasma etching of HfO{sub 2}, a high dielectric constant material, and poly-Si in BCl{sub 3} plasmas. Etching rates were measured as a function of substrate temperature (T{sub s}) at several source powers. Activation energies range from 0.2 to 1.0 kcal/mol for HfO{sub 2} and from 0.8 to 1.8 kcal/mol for Si, with little or no dependence on source power (20-200 W). These low activation energies suggest that product removal is limited by chemical sputtering of the chemisorbed Hf or Si-containing layer, with a higher T{sub s} only modestly increasing the chemical sputtering rate. The slightly lower activation energy for HfO{sub 2} results in a small improvement in selectivity over Si at low temperature. The surface layers formed on HfO{sub 2} and Si after etching in BCl{sub 3} plasmas were also investigated by vacuum-transfer x-ray photoelectron spectroscopy. A thin boron-containing layer was observed on partially etched HfO{sub 2} and on poly-Si after etching through HfO{sub 2} films. For HfO{sub 2}, a single B(1s) feature at 194 eV was ascribed to a heavily oxidized species with bonding similar to B{sub 2}O{sub 3}. B(1s) features were observed for poly-Si surfaces at 187.6 eV (B bound to Si), 189.8 eV, and 193 eV (both ascribed to BO{sub x}Cl{sub y}). In the presence of a deliberately added 0.5% air, the B-containing layer on HfO{sub 2} is largely unaffected, while that on Si converts to a thick layer with a single B(1s) peak at 194 eV and an approximate stoichiometry of B{sub 3}O{sub 4}Cl.

Wang Chunyu; Donnelly, Vincent M. [Department of Chemical and Biomolecular Engineering, University of Houston, 4800 Calhoun Road, Houston, Texas 77204 (United States)

2008-07-15T23:59:59.000Z

292

Polyatomic-buffered pulsed DF/HF laser using electron-beam or photolysis initiation  

SciTech Connect (OSTI)

The initial performance of pulsed DF/HF chain lasers is presented in which the effect of polyatomic diluents on laser behavior is systematically explored. Laser energy, pulse length, and spectral output were investigated as functions of diluent gas (NF3, SF6, CF4), total mixture pressure, the partial pressure of fuel and oxidizer, O/sub 2/ concentration, and strength of initiation. Magnetically-confined electron beam and photolytically initiated systems are found to yield comparable performance. Results include 65 J/liter-atm DF output at 200 Torr cavity pressure and the ability to suppress long wavelength transitions from the free-running spectrum. 21 references.

Amimoto, S.T.; Gross, R.W.F.; Harper, G.N.; Azevedo, L.S.; Hofland, R. Jr.

1987-06-01T23:59:59.000Z

293

High-K barrier penetration in Hf174: A challenge to K selection  

Science Journals Connector (OSTI)

A sensitive study of the decay of the deformation-aligned K=14, 4-?s isomer in Hf174 has revealed a multitude of the K-forbidden branches to the ground-state rotational band and other low-K bands, in competition with the known decays to high-K bands. The isomeric transitions have consistently low hindrance factors. These anomalous findings in an axially symmetric deformed nucleus severely test our understanding of the K-selection rule. The isomeric decay to an I=12 rotation-aligned state, and its mixing with the I=12 yrast state, provide a partial explanation.

P. M. Walker; G. Sletten; N. L. Gjrup; M. A. Bentley; J. Borggreen; B. Fabricius; A. Holm; D. Howe; J. Pedersen; J. W. Roberts; J. F. Sharpey-Schafer

1990-07-23T23:59:59.000Z

294

Results from ORNL characterization of ZrO2-500-AK2 - surrogate TRISO material  

SciTech Connect (OSTI)

This document is a compilation of the characterization data for the TRISO-coated surrogate particles designated ZrO2-500-AK2 that was produced at Oak Ridge National Laboratory (ORNL) as part of the Advanced Gas Reactor Fuel Development and Qualification (AGR) program. The ZrO2-500-AK2 material contains nominally 500 {micro}m kernels of yttria-stabilized zirconia (YSZ) coated with all TRISO layers (buffer, inner pyrocarbon, silicon carbide, and outer pyrocarbon). The ZrO2-500-AK2 material was created for: (1) irradiation testing in the High Flux Isotope Reactor (HFIR) and (2) limited dissemination to laboratories as deemed appropriate to the AGR program. This material was created midway into a TRISO fuel development program to accommodate a sudden opportunity to perform irradiation testing on surrogate material. While the layer deposition processes were chosen based on the best technical understanding at the time, technical progress at ORNL has led to an evolution in the perceived optimal deposition conditions since the creation of ZrO2-500-AK2. Thus, ZrO2-500-AK2 contains a reasonable TRISO microstructure, but does differ significantly from currently produced TRISO surrogates and fuel at ORNL. In this document, characterization data of the ZrO2-500-AK2 surrogate includes: size, shape, coating thickness, and density.

Kercher, Andrew K [ORNL; Hunn, John D [ORNL

2005-06-01T23:59:59.000Z

295

Results from ORNL Characterization of Zr02-500-AK2 - Surrogate TRISO Material  

SciTech Connect (OSTI)

This document is a compilation of the characterization data for the TRISO-coated surrogate particle batch designated ZrO2-500-AK2 that was produced at Oak Ridge National Laboratory (ORNL) as part of the Advanced Gas Reactor Fuel Development and Qualification (AGR) program. The ZrO2-500-AK2 material contains nominally 500 {micro}m kernels of yttria-stabilized zirconia (YSZ) coated with all TRISO layers (buffer, inner pyrocarbon, silicon carbide, and outer pyrocarbon). The ZrO2-500-AK2 material was created for: (1) irradiation testing in the High Flux Isotope Reactor (HFIR) and (2) limited dissemination to laboratories as deemed appropriate to the AGR program. This material was created midway into a TRISO fuel development program to accommodate a sudden opportunity to perform irradiation testing on surrogate material. While the layer deposition processes were chosen based on the best technical understanding at the time, technical progress at ORNL has led to an evolution in the perceived optimal deposition conditions since the createion of ZrO2-500-AK2. Thus, ZrO2-500-AK2 contains a reasonable TRISO microstructure, but does differ significanly from currently produced TRISO surrogates and fuel at ORNL. In this document, characterization data of the ZrO2-500-AK2 surrogate includes: size, shape, coating thickness, and density.

Hunn, John D [ORNL; Kercher, Andrew K [ORNL

2005-06-01T23:59:59.000Z

296

Effect of Hf substitutions on the formation and superconductivity of Tl-1212 type phase TlSr{sub 2}(Ca{sub 1?x}Hf{sub x})Cu{sub 2}O{sub 7??}  

SciTech Connect (OSTI)

The TlSr{sub 2}(Ca{sub 1?x}Hf{sub x})Cu{sub 2}O{sub 7??} (Tl-1212) superconductor for x = 0.0 to 0.4 has been prepared by the solid state reaction method and studied by powder X-ray diffraction method, electrical resistance and scanning electron microscope (SEM). Most of the samples showed the Tl-1212 as the major phase and Tl-1201 as the minor phases. Small amounts of Hf-substitution (x ? 0.15 or x ? 0.25) maintained the formation of the Tl-1212 phase but larger amounts led to the formation of 1201 and an unknown impurity phase. The resistance versus temperature curve showed metallic behavior for all samples. The resistance versus temperature curves showed onset transition temperature (T{sub c} {sub onset}) between 38 and 47 K for Hf substitution.

Al-Sharabi, Annas; Abd-Shukor, R. [School of Applied Physics, Universiti Kebangsaan Malaysia 43600 Bangi, Selangor (Malaysia)

2013-11-27T23:59:59.000Z

297

Comparison of femtosecond and nanosecond laser-induced damage in HfO{sub 2} single-layer film and HfO{sub 2}-SiO{sub 2} high reflector  

SciTech Connect (OSTI)

HfO{sub 2} single layers, 800 nm high-reflective (HR) coating, and 1064 nm HR coating were prepared by electron-beam evaporation. The laser-induced damage thresholds (LIDTs) and damage morphologies of these samples were investigated with single-pulse femtosecond and nanosecond lasers. It is found that the LIDT of the HfO{sub 2} single layer is higher than the HfO{sub 2}-SiO{sub 2} HR coating in the femtosecond regime, while the situation is opposite in the nanosecond regime. Different damage mechanisms are applied to study this phenomenon. Damage morphologies of all samples due to different laser irradiations are displayed.

Yuan Lei; Zhao Yuanan; Shang Guangqiang; Wang Chengren; He Hongbo; Shao Jianda; Fan Zhengxiu [Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 (China) and Graduate School of the Chinese Academy of Sciences, Beijing 100039 (China); Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 (China); Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 (China) and Graduate School of the Chinese Academy of Sciences, Beijing 100039 (China); Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 (China)

2007-03-15T23:59:59.000Z

298

Suppression of near-edge optical absorption band in sputter deposited HfO{sub 2}-Al{sub 2}O{sub 3} nanolaminates containing nonmonoclinic HfO{sub 2}  

SciTech Connect (OSTI)

Nanolaminates of polycrystalline (tetragonal+orthorhombic) HfO{sub 2} and amorphous Al{sub 2}O{sub 3} are sputter deposited on unheated fused SiO{sub 2}, air annealed at 573-1273 K, and analyzed by x-ray diffraction and spectrophometry. Significant O 2p{yields}Hf 5d interband absorption occurs in all films at energy E{>=}6.2 eV. For E<6.2 eV, films annealed below 1273 K retain a featureless optical absorption edge despite further crystallization. A band with a 5.65 eV onset concurrently develops with m-HfO{sub 2} crystallization after a 1273 K anneal, indicating this phase and not nanocrystallinity per se is responsible for increased absorption.

Hoppe, E. E.; Aita, C. R. [Advanced Coatings Experimental Laboratory, University of Wisconsin-Milwaukee, P.O. Box 784, Milwaukee, Wisconsin 53201 (United States)

2008-04-07T23:59:59.000Z

299

Effective work function of Pt, Pd, and Re on atomic layer deposited HfO{sub 2}  

SciTech Connect (OSTI)

Platinum and Pd show a significant difference in work function on SiO{sub 2} and high-K materials (HfO{sub 2}). The effective metal work functions for Pd, Pt, and Re on atomic layer deposited HfO{sub 2}, which are different from the vacuum work function and important for device threshold voltage control, are measured by the C-V method. The difference is attributed to the dipoles at the metal/HfO{sub 2} interface, which is a result of charge transfer across the interface. Moreover, the extracted charge neutrality level and screening parameter are correlated with the phase development, film stoichiometry, and density of interface states at the metal/high-K interface.

Gu Diefeng; Dey, Sandwip K.; Majhi, Prashant [Department of Chemical and Materials Engineering, Arizona State University, Tempe, Arizona 85287-6006 (United States) and Department of Electrical Engineering, Arizona State University, Tempe, Arizona 85287-5706 (United States); Planar CMOS Scaling, SEMATECH, Austin, Texas 78741 (United States)

2006-08-21T23:59:59.000Z

300

Local elastic modulus of RF sputtered HfO{sub 2} thin film by atomic force acoustic microscopy  

SciTech Connect (OSTI)

Atomic force acoustic microscopy (AFAM) is a useful nondestructive technique for measurement of local elastic modulus of materials at nano-scale spatial resolution by measuring the contact resonance spectra for higher order modes of the AFM cantilever. The elastic modulus of RF sputtered HfO{sub 2} thin film has been measured quantitatively, using reference approach in which measurements are performed on the test and reference samples. Using AFAM, the measured elastic modulus of the HfO{sub 2} thin film is 223±27 GPa, which is in agreement with the literature value of 220±40 GPa for atomic layer deposited HfO{sub 2} thin film using nanoindentation technique.

Jena, S., E-mail: shuvendujena9@gmail.com; Tokas, R. B., E-mail: shuvendujena9@gmail.com; Sarkar, P., E-mail: shuvendujena9@gmail.com; Thakur, S.; Sahoo, N. K. [Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085 (India); Misal, J. S.; Rao, K. D. [Optics and Thin Film Laboratory, Autonagar, BARC-Vizag, Visakhapatnam-530 012 (India)

2014-04-24T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Effects of shock waves on the performance of a cw supersonic HF chemical laser  

SciTech Connect (OSTI)

The effects of oblique shock waves on the gain and the output power of a cw supersonic HF chemical laser are theoretically investigated. A one-dimensional model is used to solve the flow of a premixed H/sub 2/--SF/sub 6/--H/sub e/ or H/sub 2/--F/sub 2/--H/sub e/ mixture through the resonator, allowing the presence of oblique shock waves in the flow. It is shown that a shock wave significantly affects the laser performance due to the gas compression at the shock front and due to acceleration of the chemical and energy transfer processes. It was found that immediately behind the shock front the gain coefficients and the photon energy sharply increase and further downstream they fall off rapidly, thus the profiles of the gain and radiation flux become narrower along the flow direction. Integration of the radiation flux along the cavity coordinate reveals that in some cases the total available power is significantly higher than the available power obtained in the undisturbed flow. For HF lasers pumped by the chain reactions it was found that choking occurs over a wide range of flow parameters including very weak shock waves. This is due to the large amount of heat released by the exothermic reactions.

Stricker, J.; Waichman, K.

1984-09-01T23:59:59.000Z

302

Corrosion Behavior of Copper Thin Films in Organic HF-Containing Cleaning Solution for Semiconductor Applications  

SciTech Connect (OSTI)

The corrosion behavior of electrochemically deposited copper thin films in deaerated and non-deaerated commercial cleaning solutions containing HF was investigated. Potentiodynamic polarization experiments were carried out to determine active, active-passive, passive, and transpassive regions. Corrosion rates were calculated from Tafel slopes. The addition of hydrogen peroxide to the solution and its influence on corrosion was also investigated by employing inductively coupled plasma-mass spectroscopy (ICP-MS) and X-ray photoelectron spectroscopy (XPS). The ICP-MS and potentiodynamic methods yielded comparable Cu dissolution rates. Surface analysis using atomic force microscopy and scanning electron microscopy, performed before and after the cleaning solution treatment, did not reveal any indication of pitting corrosion. The presence of hydrogen peroxide in the cleaning solution led to more than an order of magnitude suppression of copper dissolution rate. We ascribe this phenomenon to the formation of interfacial CuO detected by XPS on the wafer surface that dissolves at a slower rate in dilute HF.

Nabil G. Mistkawi,a,b Makarem A. Hussein,b Malgorzata Ziomek-Moroz,c and

2009-11-13T23:59:59.000Z

303

Excited States of Hf174 from the Decay of Ta174  

Science Journals Connector (OSTI)

The Ta174 activity was produced via the Lu175(?,5n)Ta174 reaction with 66-MeV ? particles from the Crocker Nuclear Laboratory 76-in. isochronous cyclotron. After removal of the F18, the half-lives were deduced by direct measurements. The half-lives of approximately 200 transitions, ranging in energy from 60 to 3000 keV, were identified using Ge(Li) detectors. Over 95% of these lines were assigned to Hf175, Hf174, or Lu173. The half-life of Ta174 was measured to be 71.5 ± 6.5 min. Ge(Li)-Nal coincidence work has been done. The conversion-electron spectrum was first measured using a 3-mm Si(Li) detector with a cooled field-effect transistor and then using the same type of detector plus a magnet.The energies and ? intensities of the 100 transitions attributed to the decay of Ta174 were measured. 32 conversion coefficients were determined. 16 levels with spins and parities are proposed on the basis of ? intensities, coincidence information, and conversion coefficients. 16 more levels are proposed on the basis of energy sums. Spins and parities for four of these levels are suggested. 60 transitions are placed in the decay scheme. A very strong ? feed to the 4+ level of the ground-state rotational band was observed. M1 enhancement in the ? vibrational bands and K-forbidden ? transitions are discussed.

M. T. Gillin and N. F. Peek

1971-10-01T23:59:59.000Z

304

Measurements of spatial and frequency coherence of an equatorial hf path during spread-F  

SciTech Connect (OSTI)

In August 1990, the authors set up an hf path on the equatorial path between Maloelap Atoll and Bikini Atoll. This path, which had a range of 702 km, reflected in the ionosphere approximately 100 km north of the Altair radar location on Kwajalein. Transmitters at Maloelap broadcasted four cw tones within bandwidth of either 4 kHz, 9 kHz, or 70 kHz to be used to determine frequency coherence and also a phase-coded pseudo random sequence with a bandwidth of 60 kHz (channel probe) to be used to determine time delay spread. A spatial array of antennas was deployed at Bikini to measure spatial and frequency coherence using the cw broadcasts. The system was run in the post-sunset time period over two weeks during which almost every night showed significant degradation due to spread F resulting in rapid fading, decreased spatial and frequency coherence, and increased time delay spread. Doppler spreads of greater than 20 Hz were not uncommon, and the spatial correlation distances and frequency coherence bandwidths became so small (50 meters and 1 kHz respectively) that the experiment had to be readjusted. Measurements taken by the Altair incoherent scatter radar and the CUPRI 50 MHz coherent scatter radar indicate that although the bistatic hf channel is affected by the large scale plume structures, most of the [open quotes]damage[close quotes] is done by the bottomside spread F.

Fitzgerald, T.J.; Argo, P.E.; Carlos, R.C.

1993-01-01T23:59:59.000Z

305

Measurements of spatial and frequency coherence of an equatorial hf path during spread-F  

SciTech Connect (OSTI)

In August 1990, the authors set up an hf path on the equatorial path between Maloelap Atoll and Bikini Atoll. This path, which had a range of 702 km, reflected in the ionosphere approximately 100 km north of the Altair radar location on Kwajalein. Transmitters at Maloelap broadcasted four cw tones within bandwidth of either 4 kHz, 9 kHz, or 70 kHz to be used to determine frequency coherence and also a phase-coded pseudo random sequence with a bandwidth of 60 kHz (channel probe) to be used to determine time delay spread. A spatial array of antennas was deployed at Bikini to measure spatial and frequency coherence using the cw broadcasts. The system was run in the post-sunset time period over two weeks during which almost every night showed significant degradation due to spread F resulting in rapid fading, decreased spatial and frequency coherence, and increased time delay spread. Doppler spreads of greater than 20 Hz were not uncommon, and the spatial correlation distances and frequency coherence bandwidths became so small (50 meters and 1 kHz respectively) that the experiment had to be readjusted. Measurements taken by the Altair incoherent scatter radar and the CUPRI 50 MHz coherent scatter radar indicate that although the bistatic hf channel is affected by the large scale plume structures, most of the {open_quotes}damage{close_quotes} is done by the bottomside spread F.

Fitzgerald, T.J.; Argo, P.E.; Carlos, R.C.

1993-07-01T23:59:59.000Z

306

Superlattice Structure and Precipitates in O+ and Zr+ Ion Coimplanted SrTiO3: a Model Waste Form for 90Sr  

SciTech Connect (OSTI)

We investigate strontium titanate as a model waste form for 90Sr. Implantation with O+ and Zr+ ions, followed by annealing at 1423 K, was performed to simulate 90Sr to 90Zr decays. At low Zr concentrations, we observe formation of a ZrO-Sr superlattice structure. Ab initio calculations indicate that this atomic configuration is energetically favorable. At higher Zr concentrations, we observe precipitates of ZrO2 with a coherently strained interface, or a monolayer of disordered interfacial structure. Potential candidacy of 90SrTiO3 as a waste form for permanent disposal of 90Sr is discussed.

Jiang, Weilin; Van Ginhoven, Renee M.; Kovarik, Libor; Jaffe, John E.; Arey, Bruce W.

2012-07-13T23:59:59.000Z

307

Energy parameters and stability of the discharge in a nonchain, self-sustained-discharge-pumped HF laser  

SciTech Connect (OSTI)

The generation and discharge are studied in a nonchain HF laser operating on mixtures of SF{sub 6} with hydrogen and hydrocarbons. The specific output energy of the laser is 8.8 J L{sup -1} (73 J L{sup -1} atm{sup -1}) and the total lasing efficiency is 5.5%. It is shown that the formation and maintaining of a volume discharge in self-sustained-discharge-pumped HF lasers with a large content of electronegative gases is caused by the accumulation of the volume discharge of negative ions in conducting regions. (letters)

Tarasenko, Viktor F; Orlovskii, Viktor M; Panchenko, Aleksei N [Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, Tomsk (Russian Federation)

2001-12-31T23:59:59.000Z

308

Effect of nickel loading on the activity of Ni/ZrO2 for methane steam reforming at low temperature  

Science Journals Connector (OSTI)

The effect of Ni loading on the catalytic activity of Ni/ZrO2 catalyst for methane steam reforming was investigated. The sample containing 15 wt...

Long Q. Nguyen; Leonila C. Abella…

2008-04-01T23:59:59.000Z

309

Interplay between gadolinium dopants and oxygen vacancies in HfO{sub 2}: A density functional theory plus Hubbard U investigation  

SciTech Connect (OSTI)

The influence of gadolinium (Gd) doping on the oxygen vacancy (V{sub O}) in monoclinic HfO{sub 2} have been studied by the first-principles calculations within the spin-polarized generalized gradient approximation plus Hubbard U approach. It is found that the Gd dopant and V{sub O} show strong attractive interaction, resulting in a cooperative effect that the substitution of Gd for Hf (Gd{sub Hf}) would increase the probability of oxygen vacancies generation and vice versa. The Gd{sub Hf} is more energetically favorable to be next to the vacancy site of a three-coordinated oxygen (O3), forming a complex defect Gd{sub Hf} + V{sub O}. A single Gd{sub Hf} acts a hole donor and passivates the defect states of V{sub O}. Our results suggest that the decrease of the V{sub O}-related defect states observed in the photoluminescence spectra of Gd-HfO{sub 2} is because Gd doping passivates the defect states of V{sub O}, rather than caused by decrease of V{sub O} concentration. Our findings would clarify the debate about the influence of Gd doping on the oxygen vacancies in HfO{sub 2}.

Zhang, Wei [Department of Criminal Science and Technology, Nanjing Forest Police College, Nanjing 210023 (China); Hou, Z. F., E-mail: zhufeng.hou@gmail.com [Department of Electronic Science, Xiamen University, Xiamen 361005 (China)

2014-03-28T23:59:59.000Z

310

A comparison of EISCAT and HF Doppler observations of a ULF wave D. M. Wright, T. K. Yeoman, J. A. Davies  

E-Print Network [OSTI]

A comparison of EISCAT and HF Doppler observations of a ULF wave D. M. Wright, T. K. Yeoman, J. A, Wright et al. (1997) presented a detailed study of ULF wave signatures observed by a new sounder at high observed by HF Doppler Correspondence to: D. M. Wright Presented at the Eighth International EISCAT

Paris-Sud XI, Université de

311

The effects of zirconia morphology on methanol synthesis from COand H2 over Cu/ZrO2 catalysts: Part I -- Steady-State Studies  

SciTech Connect (OSTI)

The effect of zirconia phase on the activity and selectivityof Cu/ZrO2 for the hydrogenation of CO has been investigated. Relativelypure t-ZrO2 and m-ZrO2 were prepared with high surface areas (~; 145m2/g). Copper was then deposited onto the surface of these materials byeither incipient-wetness impregnation or deposition-precipitation. For afixed Cu surface area, Cu/m-ZrO2 was tenfold more active for methanolsynthesis than Cu/t-ZrO2 from a feed of 3/1 H2/CO at 3.0 MPa andtemperatures between 473 and 523 K. Cu/m-ZrO2 also exhibited a higherselectivity to methanol. Increasing the Cu surface area on m-ZrO2resulted in further improvement in activity with minimal change inselectivity. Methanol productivity increased linearly for both Cu/t-ZrO2and Cu/m-ZrO2 with increasing Cu surface area. The difference in inherentactivity of each phase paralleled the stronger and larger CO adsorptioncapacity of the Cu/m-ZrO2 as quantified by CO-TPD. The higher COadsorption capacity of Cu/m-ZrO2 is attributed to the presence of a highconcentration of anionic vacancies on the surface of m-ZrO2. Suchvacancies expose cus-Zr4+ cations, which act as Lewis acid centers andenhance the Bronsted acidity of adjacent Zr-OH groups. The presence ofcus-Zr4+ sites and adjacent Bronsted acidic Zr-OH groups contributes tothe adsorption of CO as HCOO-Zr groups, which are the initial precursorsto methanol.

Rhodes, Michael J.; Bell, Alexis T.

2005-03-21T23:59:59.000Z

312

Portsmouth DUF6 Conversion Final EIS - Appendix E: Impacts Associated with HF and CaF2 Conversion Product Sale and Use  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Portsmouth DUF Portsmouth DUF 6 Conversion Final EIS APPENDIX E: IMPACTS ASSOCIATED WITH HF AND CaF 2 CONVERSION PRODUCT SALE AND USE HF and CaF 2 Conversion Products E-2 Portsmouth DUF 6 Conversion Final EIS HF and CaF 2 Conversion Products E-3 Portsmouth DUF 6 Conversion Final EIS APPENDIX E: IMPACTS ASSOCIATED WITH HF AND CaF 2 CONVERSION PRODUCT SALE AND USE E.1 INTRODUCTION During the conversion of the depleted uranium hexafluoride (DUF 6 ) inventory to depleted uranium oxide, products having some potential for sale to commercial users would be produced. These products would include aqueous hydrogen fluoride (HF) and calcium fluoride (CaF 2 , commonly referred to as fluorspar). These products are routinely used as commercial materials, and an investigation into their potential reuse was done; results are included as part of

313

Paducah DUF6 Conversion Final EIS - Appendix E: Impacts Associated with HF and CaF2 Conversion Product Sale and Use  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Paducah DUF Paducah DUF 6 Conversion Final EIS APPENDIX E: IMPACTS ASSOCIATED WITH HF AND CaF 2 CONVERSION PRODUCT SALE AND USE HF and CaF 2 Conversion Products E-2 Paducah DUF 6 Conversion Final EIS HF and CaF 2 Conversion Products E-3 Paducah DUF 6 Conversion Final EIS APPENDIX E: IMPACTS ASSOCIATED WITH HF AND CaF 2 CONVERSION PRODUCT SALE AND USE E.1 INTRODUCTION During the conversion of the depleted uranium hexafluoride (DUF 6 ) inventory to depleted uranium oxide, products having some potential for sale to commercial users would be produced. These products would include aqueous hydrogen fluoride (HF) and calcium fluoride (CaF 2 , commonly referred to as fluorspar). These products are routinely used as commercial materials, and an investigation into their potential reuse was done; results are included as part of

314

Melting temperatures of the ZrO{sub 2}-MOX system  

SciTech Connect (OSTI)

Severe accidents occurred at the Fukushima Daiichi Nuclear Power Plant Units 1-3 on March 11, 2011. MOX fuels were loaded in the Unit 3. For the thermal analysis of the severe accident, melting temperature and phase state of MOX corium were investigated. The simulated coriums were prepared from 4%Pu-containing MOX, 8%Pu-containing MOX and ZrO{sub 2}. Then X-ray diffraction, density and melting temperature measurements were carried out as a function of zirconium and plutonium contents. The cubic phase was observed in the 25%Zr-containing corium and the tetragonal phase was observed in the 50% and 75%Zr-containing coria. The lattice parameter and density monotonically changed with Pu content. Melting temperature increased with increasing Pu content; melting temperature were estimated to be 2932 K for 4%Pu MOX corium and 3012 K for 8%Pu MOX corium in the 25%ZrO{sub 2}-MOX system. The lowest melting temperature was observed for 50%Zr-containing corium. (authors)

Uchida, T.; Hirooka, S.; Kato, M.; Morimoto, K. [Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194 (Japan); Sugata, H.; Shibata, K.; Sato, D. [Inspection Development Company, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194 (Japan)

2013-07-01T23:59:59.000Z

315

INVESTIGATION OF LASER SUPPORTED DETONATION WAVES AND THERMAL COUPLING USING 2.8um HF LASER IRRADIATED METAL TARGETS  

E-Print Network [OSTI]

INVESTIGATION OF LASER SUPPORTED DETONATION WAVES AND THERMAL COUPLING USING 2.8um HF LASER of Hull, Hull, HU6 7RX, England. Abstract.- The formation and propagation of laser supported detonation was obtained in a of laser supported detonation waves and thermal o. 300 nsec. pulse (FHHM). The laser output

Boyer, Edmond

316

Computational investigation of the phase stability and the electronic properties for Gd-doped HfO{sub 2}  

SciTech Connect (OSTI)

Rare earth doping is an important approach to improve the desired properties of high-k gate dielectric oxides. We have carried out a comprehensive theoretical investigation on the phase stability, band gap, formation of oxygen vacancies, and dielectric properties for the Gd-doped HfO{sub 2}. Our calculated results indicate that the tetragonal phase is more stable than the monoclinic phase when the Gd doping concentration is greater than 15.5%, which is in a good agreement with the experimental observations. The dopant's geometric effect is mainly responsible for the phase stability. The Gd doping enlarges the band gap of the material. The dielectric constant for the Gd-doped HfO{sub 2} is in the range of 20–30 that is suitable for high-k dielectric applications. The neutral oxygen vacancy formation energy is 3.2?eV lower in the doped material than in pure HfO{sub 2}. We explain the experimental observation on the decrease of photoluminescence intensities in the Gd-doped HfO{sub 2} according to forming the dopant-oxygen vacancy complexes.

Wang, L. G. [General Research Institute for Nonferrous Metals, Beijing 100088 (China); California Institute of Technology, Pasadena, California 91125 (United States); Xiong, Y.; Xiao, W.; Cheng, L.; Du, J.; Tu, H. [General Research Institute for Nonferrous Metals, Beijing 100088 (China); Walle, A. van de [Brown University, Providence, Rhode Island 02912 (United States); California Institute of Technology, Pasadena, California 91125 (United States)

2014-05-19T23:59:59.000Z

317

Plastic deformation magnetic assembly of out-of-plane structures using vapour phase hydrofluoric (HF) acid release  

Science Journals Connector (OSTI)

We report on the fabrication of out-of-plane microstructures using plastic deformation magnetic assembly (PDMA) and vapour phase HF release process. A 0.5@mm thin silicon oxide (SiO"2) layer deposited on blank silicon has been implemented as a sacrificial ... Keywords: Dry release method, Hydrofluoric acid, Plastic deformation magnetic assembly

P. Argyrakis; R. Cheung

2009-11-01T23:59:59.000Z

318

The Long Wavelength Array (LWA): A Large HF/VHF Array for Solar Physics, Ionospheric Science, and Solar Radar  

E-Print Network [OSTI]

The Long Wavelength Array (LWA): A Large HF/VHF Array for Solar Physics, Ionospheric Science, and Solar Radar Namir E. Kassim Naval Research Laboratory, Washington, DC 20375 Stephen M. White AFRL will be a powerful tool for solar physics and space weather investigations, through its ability to characterize

Ellingson, Steven W.

319

Role of hydrogen in Ge/HfO2/Al gate stacks subjected to negative bias temperature instability  

E-Print Network [OSTI]

Role of hydrogen in Ge/HfO2/Al gate stacks subjected to negative bias temperature instability N 2007; published online 17 January 2008 This work investigates the role of hydrogen and nitrogen in a Ge. Virtually unchanged interface state density as a function of NBTI indicates no atomic hydrogen release from

Misra, Durgamadhab "Durga"

320

The Department of Energy's American Recovery and Reinvestment Act - California State Energy Program, OAS-RA-11-10  

Broader source: Energy.gov (indexed) [DOE]

Department of Energy's Department of Energy's American Recovery and Reinvestment Act - California State Energy Program OAS-RA-11-10 July 2011 Department of Energy Washington, DC 20585 July 28, 2011 MEMORANDUM FOR THE ACTING ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: George W. Collard Assistant Inspector General for Audits Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's American Recovery and Reinvestment Act - California State Energy Program" BACKGROUND The Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) provides grants to states, territories and the District of Columbia (states) through the State

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

The Department of Energy's American Recovery and Reinvestment Act - New York State Energy Program, OAS-RA-12-08  

Broader source: Energy.gov (indexed) [DOE]

Department of Energy Department of Energy Office of Inspector General Office of Audits and Inspections Audit Report The Department of Energy's American Recovery and Reinvestment Act - New York State Energy Program OAS-RA-12-08 April 2012 Department of Energy Washington, DC 20585 April 19, 2012 MEMORANDUM FOR THE ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY for FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's American Recovery and Reinvestment Act - New York State Energy Program" BACKGROUND The Department of Energy's State Energy Program (SEP) provides grants to states, territories

322

Los Alamos National Laboratory Environmental Management Activities Funded by the Recovery Act, OAS-RA-11-15  

Broader source: Energy.gov (indexed) [DOE]

Los Alamos National Laboratory Los Alamos National Laboratory Environmental Management Activities Funded by the Recovery Act OAS-RA-11-15 August 2011 Department of Energy Washington, DC 20585 August 25, 2011 MEMORANDUM FOR THE MANAGER, LOS ALAMOS SITE OFFICE, NATIONAL NUCLEAR SECURITY ADMINISTRATION FROM: George W. Collard Assistant Inspector General for Audits SUBJECT: INFORMATION: Audit Report on "Los Alamos National Laboratory Environmental Management Activities Funded by the Recovery Act" BACKGROUND In February 2009, the American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted. The Department of Energy's (Department) National Nuclear Security Administration (NNSA) received approximately $212 million in Recovery Act funds from the Office of

323

The Department of Energy's American Recovery and Reinvestment Act - Washington State Energy Program, OAS-RA-12-10  

Broader source: Energy.gov (indexed) [DOE]

Washington Washington State Energy Program OAS-RA-12-10 May 2012 Department of Energy Washington, DC 20585 May 5, 2012 MEMORANDUM FOR THE ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's American Recovery and Reinvestment Act - Washington State Energy Program" BACKGROUND The Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) provides grants to states, territories and the District of Columbia (states) to support various energy priorities through the State Energy Program (SEP). These grants are awarded based on

324

Laboratory Results Area Lab ID Th-230 Ra-226 Pb-210 Po-210 U-238 ANSI Sum1  

E-Print Network [OSTI]

Laboratory Results Area Lab ID Th-230 Ra-226 Pb-210 Po-210 U-238 ANSI Sum1 Gamma Reading Area H Area I Confirmation 0405025-2 1.66 5.13 2.88 3.48 0.95 4.55 9741 Clear 11th Street 0405215-3 1.28 4.59 3.55 3.55 1.68 4.37 ++ Area K 0404284-2 14.8 43.4 17.4 13.8 10.6 80.8 15146 Estimated - lab

325

Mechanisms for plasma etching of HfO{sub 2} gate stacks with Si selectivity and photoresist trimming  

SciTech Connect (OSTI)

To minimize leakage currents resulting from the thinning of the insulator in the gate stack of field effect transistors, high-dielectric constant (high-k) metal oxides, and HfO{sub 2} in particular, are being implemented as a replacement for SiO{sub 2}. To speed the rate of processing, it is desirable to etch the gate stack (e.g., metal gate, antireflection layers, and dielectric) in a single process while having selectivity to the underlying Si. Plasma etching using Ar/BCl{sub 3}/Cl{sub 2} mixtures effectively etches HfO{sub 2} while having good selectivity to Si. In this article, results from integrated reactor and feature scale modeling of gate-stack etching in Ar/BCl{sub 3}/Cl{sub 2} plasmas, preceded by photoresist trimming in Ar/O{sub 2} plasmas, are discussed. It was found that BCl{sub n} species react with HfO{sub 2}, which under ion impact, form volatile etch products such as B{sub m}OCl{sub n} and HfCl{sub n}. Selectivity to Si is achieved by creating Si-B bonding as a precursor to the deposition of a BCl{sub n} polymer which slows the etch rate relative to HfO{sub 2}. The low ion energies required to achieve this selectivity then challenge one to obtain highly anisotropic profiles in the metal gate portion of the stack. Validation was performed with data from literature. The effect of bias voltage and key reactant probabilities on etch rate, selectivity, and profile are discussed.

Shoeb, Juline; Kushner, Mark J. [Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States); Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109-2122 (United States)

2009-11-15T23:59:59.000Z

326

Identification of a quasiparticle band in very neutron-rich {sup 104}Zr  

SciTech Connect (OSTI)

The high spin levels of a very neutron-rich {sup 104}Zr nucleus have been reinvestigated by measuring the prompt {gamma} rays in the spontaneous fission of {sup 252}Cf. The ground-state band has been confirmed. A new sideband has been identified with a band-head energy at 1928.7 keV. The projected shell model is employed to investigate the band structure of {sup 104}Zr. The results of calculated levels are in good agreement with the experimental data, and suggest that the new band in {sup 104}Zr may be based on the neutron {nu}5/2{sup -}[532] x {nu}3/2{sup +}[411] configuration.

Yeoh, E. Y.; Wang, J. G.; Ding, H. B.; Gu, L.; Xu, Q.; Xiao, Z. G. [Department of Physics, Tsinghua University, Beijing 100084 (China); Zhu, S. J. [Department of Physics, Tsinghua University, Beijing 100084 (China); Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Hamilton, J. H.; Ramayya, A. V.; Hwang, J. K.; Liu, S. H. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Liu, Y. X. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); School of Science, Huzhou Teachers College, Huzhou 313000 (China); Sun, Y. [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); Luo, Y. X. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Rasmussen, J. O.; Lee, I. Y. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2010-08-15T23:59:59.000Z

327

Hall Effect, Resistivity, and Magnetoresistivity of Th, U, Zr, Ti, and Nb  

Science Journals Connector (OSTI)

The Hall effect, resistivity, and magnetoresistivity of Th, U, Zr, Ti, and Nb have been studied at temperatures between ?1°K and room temperature and in magnetic fields up to 30 kilogauss. Strong temperature and purity dependences were observed in the Hall coefficients of U, Ti, and Zr. In addition, the Hall coefficient of Zr was strongly dependent upon magnetic field strength at liquid helium temperatures. Comparisons with theory have been carried out, and it is concluded that existing theories are not sufficiently general to account quantitatively for the observed temperature and magnetic field dependences of the Hall effect and resistivity. Unusual behavior was observed in the magnetic-field-induced superconducting transition of Nb.

Ted G. Berlincourt

1959-05-15T23:59:59.000Z

328

Photocatalytic studies of Ho–Zr–O nano-composite with controllable composition and defects  

SciTech Connect (OSTI)

With the help of sol–gel method assisted by melting salt, a series of Ho–Zr–O nano-composite with controllable composition and defects have been successfully prepared. Characterization results show that the positions, intensity, and width of the X-ray diffraction peaks of the products have a regular variation with the increase of zirconium element which implies the gradual changes of crystal spacing and product size. At the same time, the molar ratios between holmium and zirconium ions are consistent with the chemical formula and both of them are uniformly distributed in products further showing the perfect formation of targeted materials. Optical properties reveal that diversified defect forms of Ho–Zr–O nano-composite lead to the different absorptions of visible light. Photocatalytic experiments demonstrate Zr{sub 0.8}Ho{sub 0.2}O{sub 2??} nano-crystals have excellent visible-light-responsive photocatalytic activities on some familiar dyes (e.g.: methylene blue and Rhodamine B) which results from the special defect structure, better absorption of visible light and larger specific surface area. It follows that Zr{sub 0.8}Ho{sub 0.2}O{sub 2??} nano-crystals are a new kind of visible-light-responsive photocatalysts with better prospects in conversion and utilization of solar energy. Also, the present melting salt assisted route might be generalized to synthesize other AxByOz composite oxide nano-crystals with more complicated structures. - Highlights: • Ho–Zr–O nano-composite with controllable composition and defects has been obtained. • Diversified defect forms of products lead to the different visible light absorption. • Zr{sub 0.8}Ho{sub 0.2}O{sub 2??} nano-crystals have excellent photocatalytic activities.

Du, Weimin, E-mail: duweimin75@gmail.com [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455000 (China); Zhao, Guoyan; Chang, Hongxun; Shi, Fei; Zhu, Zhaoqiang [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455000 (China); Qian, Xuefeng [School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240 (China)

2013-09-15T23:59:59.000Z

329

Epitaxial Pb(Zr, Ti)O3 thin films with coexisting tetragonal and rhombohedral phases  

Science Journals Connector (OSTI)

Epitaxial Pb(Zr, Ti)O3 thin films having coexisting tetragonal and rhombohedral phases have been successfully fabricated with the film compositions that correspond to the Zr-rich region of the morphotropic phase boundary (MPB). The key to the present success is to quantitatively understand the shift of the MPB under a film stress. The present fabrication has been theoretically justified by superimposing the computed temperature-dependent film stress on the theoretical temperature-stress (T-S) phase diagram and by delineating a probable phase-transition path upon cooling the film from the processing temperature.

S. Hoon Oh and Hyun M. Jang

2001-03-12T23:59:59.000Z

330

Silicon photodiode with selective Zr/Si coating for extreme ultraviolet spectral range  

SciTech Connect (OSTI)

The procedure of manufacturing silicon photodiodes with an integrated Zr/Si filter for extreme ultraviolet (EUV) spectral range is developed. A setup for measuring the sensitivity profile of detectors with spatial resolution better than 100 {mu}m is fabricated. The optical properties of silicon photodiodes in the EUV and visible spectral ranges are investigated. Some characteristics of SPD-100UV diodes with Zr/Si coating and without it, as well as of AXUV-100 diodes, are compared. In all types of detectors a narrow region beyond the operating aperture is found to be sensitive to the visible light. (photodetectors)

Aruev, P N; Barysheva, Mariya M; Ber, B Ya; Zabrodskaya, N V; Zabrodskii, V V; Lopatin, A Ya; Pestov, Alexey E; Petrenko, M V; Polkovnikov, V N; Salashchenko, Nikolai N; Sukhanov, V L; Chkhalo, Nikolai I

2012-10-31T23:59:59.000Z

331

Deformation Mechanisms in Tube Billets from Zr-1%Nb Alloy under Radial Forging  

SciTech Connect (OSTI)

Features of the deformation process by cold radial forging of tube billets from Zr-1%Nb alloy were reconstructed on the basis of X-ray data concerning their structure and texture. The cold radial forging intensifies grain fragmentation in the bulk of billet and increases significantly the latent hardening of potentially active slip systems, so that operation only of the single slip system becomes possible. As a result, in radially-forged billets unusual deformation and recrystallization textures arise. These textures differ from usual textures of {alpha}-Zr by the mutual inversion of crystallographic axes, aligned along the axis of tube.

Perlovich, Yuriy; Isaenkova, Margarita; Fesenko, Vladimir; Krymskaya, Olga [National Research Nuclear University 'Moscow Engineering Physics Institute', Kashirskoe shosse, 31, Moscow, 115409 (Russian Federation); Zavodchikov, Alexander [Perm Research Technological Institute, Hasan Heroes street, 41, Perm, 614990 (Russian Federation)

2011-05-04T23:59:59.000Z

332

Direct observation of bias-dependence potential distribution in metal/HfO{sub 2} gate stack structures by hard x-ray photoelectron spectroscopy under device operation  

SciTech Connect (OSTI)

Although gate stack structures with high-k materials have been extensively investigated, there are some issues to be solved for the formation of high quality gate stack structures. In the present study, we employed hard x-ray photoelectron spectroscopy in operating devices. This method allows us to investigate bias dependent electronic states, while keeping device structures intact. Using this method, we have investigated electronic states and potential distribution in gate metal/HfO{sub 2} gate stack structures under device operation. Analysis of the core levels shifts as a function of the bias voltage indicated that a potential drop occurred at the Pt/HfO{sub 2} interface for a Pt/HfO{sub 2} gate structure, while a potential gradient was not observed at the Ru/HfO{sub 2} interface for a Ru/HfO{sub 2} gate structure. Angle resolved photoelectron spectroscopy revealed that a thicker SiO{sub 2} layer was formed at the Pt/HfO{sub 2} interface, indicating that the origin of potential drop at Pt/HfO{sub 2} interface is formation of the thick SiO{sub 2} layer at the interface. The formation of the thick SiO{sub 2} layer at the metal/high-k interface might concern the Fermi level pinning, which is observed in metal/high-k gate stack structures.

Yamashita, Y. [National Institute for Materials Science, Advanced Electric Materials Center, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); National Institute for Materials Science, NIMS Beamline Station at SPring-8, 1-1-1 Kôto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan); Yoshikawa, H.; Kobayashi, K. [National Institute for Materials Science, NIMS Beamline Station at SPring-8, 1-1-1 Kôto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan); Chikyo, T. [National Institute for Materials Science, Advanced Electric Materials Center, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

2014-01-28T23:59:59.000Z

333

Thermodynamic properties and interfacial layer characteristics of HfO{sub 2} thin films deposited by plasma-enhanced atomic layer deposition  

SciTech Connect (OSTI)

The thermodynamic properties and interfacial characteristics of HfO{sub 2} thin films that were deposited by the direct plasma atomic layer deposition (DPALD) method are investigated. The as-deposited HfO{sub 2} films that were deposited by the DPALD method show crystallization of the HfO{sub 2} layers, which initiates at approximately the 35th cycle (about 2.8 nm) of the DPALD process. Medium-energy ion scattering analysis reveals that the direct O{sub 2} plasma causes a compositional change in the interfacial layer as the process progresses. With an increase in the number of process cycles, the Si content decreases and the O content increases at that position, so that the HfO{sub 2}-like Hf-silicate layer is formed on top of the interfacial layer. The enhanced physical reactivity of the oxygen ions in the direct plasma and the Hf-silicate layer may be the driving forces that accelerate the early crystallization of the HfO{sub 2} layer in the DPALD process in the as-deposited state.

Kim, Inhoe; Kuk, Seoungwoo; Kim, Seokhoon; Kim, Jinwoo; Jeon, Hyeongtag; Cho, M.-H.; Chung, K.-B. [Division of Materials Science and Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of); Korea Research Institute of Standard and Science, Daejeon 305-600 (Korea, Republic of)

2007-05-28T23:59:59.000Z

334

Am phases in the matrix of a U-Pu-Zr alloy with Np, Am, and rare-earth elements  

SciTech Connect (OSTI)

Phases and microstructures in the matrix of an as-cast U-Pu-Zr alloy with 3 wt% Am, 2% Np, and 8% rare-earth elements were characterized by scanning and transmission electron microscopy. The matrix consists primarily of two phases, both of which contain Am: ?-(U, Np, Pu, Am) (~70 at% U, 5% Np, 14% Pu, 1% Am, and 10% Zr) and ?-(U, Np, Pu, Am)Zr2 (~25% U, 2% Np, 10-15% Pu, 1-2% Am, and 55-60 at% Zr). These phases are similar to those in U-Pu-Zr alloys, although the Zr content in ?-(U, Np, Pu, Am) is higher than that in ?-(U, Pu) and the Zr content in ?-(U, Np, Pu, Am)Zr2 is lower than that in ?-UZr2. Nanocrystalline actinide oxides with structures similar to UO2 occurred in some areas, but may have formed by reactions with the atmosphere during sample handling. Planar features consisting of a central zone of ?-(U, Np, Pu, Am) bracketed by zones of ?-(U, Np, Pu, Am)Zr2 bound irregular polygons ranging in size from a few micrometers to a few tens of micrometers across. The rest of the matrix consists of elongated domains of ?-(U, Np, Pu, Am) and ?-(U, Np, Pu, Am)Zr2. Each of these domains is a few tens of nanometers across and a few hundred nanometers long. The domains display strong preferred orientations involving areas a few hundred nanometers to a few micrometers across.

Dawn E Janney; J. Rory Kennedy; James W. Madden; Thomas P. O'Holleran

2015-01-01T23:59:59.000Z

335

{sup 226}Ra and {sup 231}Pa systematics of axial MORB, crustal residence ages, and magma chamber characteristics at 9--10{degree}N East Pacific Rise  

SciTech Connect (OSTI)

Mass spectrometric measurements of {sup 30}Th-22{sup 226}Ra and {sup 235}-U{sup 231}Pa disequilibria for axial basalts are used to determine crustal residence ages for MORB magma and investigate the temporal and spatial characteristics of axial magma chambers (AMC) at 9--10{degrees}N East Pacific Rise (EPR). Relative crustal residence ages can be calculated from variations in {sup 226}Ra/{sup 230}Th and {sup 231}Pa/{sup 235}U activity ratios for axial lavas, if (1) mantle sources and melting are uniform, and mantle transfer times are constant or rapid for axial N-MORB, and (2) {sup 231}Pa/{sup 235}U and {sup 226}Ra/{sup 230}Th in the melt are unaffected by shallow level fractional crystallization. Uniform Th, Sr, and Nd isotopic systematics and incompatible element ratios for N-MORB along the 9--10{degrees}N segment indicate that mantle sources and transfer times are similar. In addition, estimated bulk solid/melt partition coefficients for U, Th, and Pa are small, hence effects of fractional crystallization on {sup 231}Pa/{sup 235}U ratios for the melt are expected to be negligible. However, fractional crystallization of plagioclase in the AMC would lower {sup 226}Ra/{sup 230}Th ratios in the melt and produce a positive bias in {sup 226}Ra crustal residence ages for fractionated lavas.

Goldstein, S.J.; Murrell, M.T. [Los Alamos National Lab., NM (United States); Perfit, M.R. [Univ., of Florida, Gainesville, FL (United States). Dept. of Geology; Batiza, R. [Univ., of Hawaii, Honolulu, HI (United States); Fornari, D.J. [Woods Hole Oceanographic Institution, MA (United States). Dept. of Geology and Geophysics

1994-06-01T23:59:59.000Z

336

Total ionizing dose effect of ?-ray radiation on the switching characteristics and filament stability of HfOx resistive random access memory  

SciTech Connect (OSTI)

The total ionizing dose (TID) effect of gamma-ray (?-ray) irradiation on HfOx based resistive random access memory was investigated by electrical and material characterizations. The memory states can sustain TID level ?5.2 Mrad (HfO{sub 2}) without significant change in the functionality or the switching characteristics under pulse cycling. However, the stability of the filament is weakened after irradiation as memory states are more vulnerable to flipping under the electrical stress. X-ray photoelectron spectroscopy was performed to ascertain the physical mechanism of the stability degradation, which is attributed to the Hf-O bond breaking by the high-energy ?-ray exposure.

Fang, Runchen; Yu, Shimeng, E-mail: shimengy@asu.edu [School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, Arizona 85281 (United States); School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287 (United States); Gonzalez Velo, Yago; Chen, Wenhao; Holbert, Keith E.; Kozicki, Michael N.; Barnaby, Hugh [School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287 (United States)

2014-05-05T23:59:59.000Z

337

Modeling of Zircon (ZrSiO{sub 4}) and Zirconia (ZrO{sub 2}) using ADF-GUI Software  

SciTech Connect (OSTI)

Natural zircon (ZrSiO{sub 4}) has very high concentration of Uranium and Thorium of up to 5000 ppm. Radioactive decay process of alpha particles from these impurities affects some changes like several atomic displacements in the crystalline structure of zircon. The amount of track density caused by alpha particles decay process of these radioactive materials in zircon can be decreased with annealing temperatures from 700 deg. C to 980 deg. C. Recently it has been extensively studied as the possible candidate material for immobilization of fission products and actinides. Besides, zirconia (ZrO{sub 2}), product from natural zircon, is widely used in industrial field because it has excellent chemical and mechanical properties at high temperature. Dielectric constant of monoclinic, cubic and tetragonal ZrO{sub 2} can be found in the range of 22, 35 and 50 by computer simulation works. In recent years, atomistic simulations and modeling have been studied, because a lot of computational techniques can offer atomic-level approaching with minimum errors in estimations. One favorite methods is Density Functional Theory (DFT). In this study, ADF-GUI software from DFT will be used to calculate the frequency and absorption Intensity of zircon and zirconia molecules. The data from calculations will be verified with experimental works such as Raman Spectroscopy, AFM and XRD.

Lwin, Maung Tin Moe [Applied Radiation Laboratory, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur (Malaysia); Amin, Yusoff Mohd; Kassim, Hasan Abu; Kamaluddin, Burhanuddin [Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur (Malaysia)

2010-07-07T23:59:59.000Z

338

Effect of thermal annealing on charge exchange between oxygen interstitial defects within HfO{sub 2} and oxygen-deficient silicon centers within the SiO{sub 2}/Si interface  

SciTech Connect (OSTI)

We compare the charging response of rapid thermally annealed (800 and 1000 deg. C) 4 nm thick HfO{sub 2} to as-deposited HfO{sub 2} on Si by measuring the surface potential of the HfO{sub 2} layers after vacuum ultraviolet (VUV) irradiation with 11.6 eV photons. From VUV spectroscopy, we determined all HfO{sub 2} layers show the presence of oxygen-interstitial defects (OIDs). The electronic states of OID in HfO{sub 2} line up in energy with oxygen-deficient Si centers within the SiO{sub 2} interfacial layer. This implies charge exchange between OIDs within HfO{sub 2} and the O-deficient silicon centers within the SiO{sub 2} interfacial layer are very important for controlling the radiation-induced trapped charge in HfO{sub 2} dielectric stacks.

Lauer, J. L.; Shohet, J. L. [Department of Electrical and Computer Engineering and Plasma Processing and Technology Laboratory, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States); Nishi, Y. [Stanford University, Stanford, California 94305 (United States)

2009-04-20T23:59:59.000Z

339

Defining the Proton Topology of the Zr6Based Metal-Organic Framework NU-1000  

E-Print Network [OSTI]

,16-19 heavy metal capture,20,21 sensing,12 ionic conductivity,22 toxic industrial chemical capture,23Defining the Proton Topology of the Zr6Based Metal-Organic Framework NU-1000 Nora Planas,, Joseph E of Science, King Abdulaziz University, Jeddah, Saudi Arabia *S Supporting Information ABSTRACT: Metal

340

High temperature ablation resistance of ZrNp reinforced W matrix composites  

E-Print Network [OSTI]

modulus of elasticity, good thermal shock resistance, stiffness and good high temperature strengthHigh temperature ablation resistance of ZrNp reinforced W matrix composites Malik Adeel Umer microscopy (SEM) For the purpose of improving the high temperature ablation resistance of tungsten

Hong, Soon Hyung

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Oxide Electronic Conductivity and Hydrogen Pickup Fraction in Zr alloys Adrien Coueta  

E-Print Network [OSTI]

hydrogen ingress can cause cladding embrittlement and limit cladding lifetime. However, mechanisticOxide Electronic Conductivity and Hydrogen Pickup Fraction in Zr alloys Adrien Coueta , Arthur T, 77818 Moret-sur-Loing, France INTRODUCTION The hydrogen pick-up during cladding corrosion is a critical

Motta, Arthur T.

342

Chemical Synthesis of Pure and Gd-doped CaZrO3 Powders  

E-Print Network [OSTI]

5, 70569 Stuttgart, Germany Abstract Aqueous solutions of calcium chloride (CaCl2. 2H2O Starting chemicals used in this study were reagent- grade CaCl2.2H2O (Riedel de Haen), ZrOC12.8H2O (Merck

Tas, A. Cuneyt

343

IBM-1 calculations towards the neutron-rich nucleus {sup 106}Zr  

SciTech Connect (OSTI)

The neutron-rich N=66 isotonic and A=106 isobaric chains, covering regions with varying types of collectivity, are interpreted in the framework of the interacting boson model. Level energies and electric quadrupole transition probabilities are compared with available experimental information. The calculations for the known nuclei in the two chains are extrapolated toward the neutron-rich nucleus {sup 106}Zr.

Lalkovski, Stefan [Faculty of Physics, University of Sofia, Sofia, BG-1164 Bulgaria (Bulgaria); School of Environment and Technology, University of Brighton, Brighton BN2 4JG (United Kingdom); Grand Accelerateur National d'Ions Lourds, CEA/DSM-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5 (France); Isacker, P. Van [Grand Accelerateur National d'Ions Lourds, CEA/DSM-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5 (France)

2009-04-15T23:59:59.000Z

344

Phase Stability and Thermodynamic Assessment of the Np-Zr system  

E-Print Network [OSTI]

Metallic fuels have an important role to play in "fast breeder" Gen-IV type nuclear reactors, and U-Pu-Zr is one of the prototypical systems. Because of the variability in fuel chemistry during burn-up, it is important to understand the effect...

Bajaj, Saurabh

2012-02-14T23:59:59.000Z

345

Discovery of Critical Oxygen Content for Glass Formation in Zr80Pt20 Melt Spun Ribbons  

SciTech Connect (OSTI)

Zr{sub 80}Pt{sub 20} alloys may form meta-stable quasicrystals either during devitrification of an amorphous phase or directly upon cooling from a liquid depending on processing conditions. To date, little attention has been given to the role of oxygen on the glass formation or devitrification behavior of Zr-Pt and similar alloys. This study reveals that oxygen content during melt spinning indeed strongly influences the formation of the as-quenched structure. A critical amount of oxygen was found to be required to form amorphous ribbons at a fixed quench rate. At lower oxygen levels (i.e., <500 ppm mass), a fully crystallized is formed; the structure is composed mainly of meta-stable {beta}-Zr with a small fraction of a quasicrystalline phase. At higher oxygen levels, the as-quenched structure transitions to a fully amorphous structure ({approx}1000 ppm mass), and with further oxygen addition forms a mixture of amorphous and quasicrystalline ({approx}1500 ppm mass) or crystalline phases (>2500 ppm mass). Details regarding the structure of the meta-stable {beta}-Zr phase in the low-oxygen ribbons are provided along with a discussion of the structural similarity between this phase and the quasicrystal structure that formed in this alloy.

D.J. Sordelet; E.A. Rozhkova; X. Yang; M.J. Kramer

2004-09-30T23:59:59.000Z

346

Stress-corrosion fatiguecrack growth in a Zr-based bulk amorphous metal  

E-Print Network [OSTI]

of the work was to determine the rate and mechanisms of subcritical crack growth in this metallic glassStress-corrosion fatigue­crack growth in a Zr-based bulk amorphous metal V. Schroeder 1 , R. Results indicate that crack growth in aqueous solution in this alloy is driven by a stress-assisted anodic

Ritchie, Robert

347

Simultaneous observations of 46. 8-MHz and 430-MHz radar backscatter from HF-induced ionospheric Langmuir turbulence  

SciTech Connect (OSTI)

Simultaneous high-resolution spectra of the upshifted enhanced plasma line were obtained with the 46.8-MHz and 430-MHz Arecibo radars in the presence of HF transmissions at two closely spaced frequencies. The spectra obtained with the 46.8-MHz radar showed two narrow features with positive Doppler shifts equal to the two closely spaced frequencies of the HF transmissions; all the spectral power was contained in those two narrow features. The spectra obtained with the 430-MHz radar showed a single narrow feature with a positive Doppler shift equal to the arithmetic mean of the same two closely spaced frequencies; the spectral power in that narrow feature contained about 3% of the total spectral power. The present results broadly confirm the tentative interpretation of earlier observations with a 46.8-MHz radar at Arecibo. The results also show the fundamental difference in the physical processes leading to the enhanced plasma line spectra observed with the two radars.

Sulzer, M.P. (Arecibo Observatory (Puerto Rico)); Fejer, J.A. (Univ. of California, San Diego, La Jolla (United States))

1991-10-01T23:59:59.000Z

348

Atomic scale observation of phase separation and formation of silicon clusters in Hf higk-{kappa} silicates  

SciTech Connect (OSTI)

Hafnium silicate films were fabricated by RF reactive magnetron sputtering technique. Fine microstructural analyses of the films were performed by means of high-resolution transmission electron microscopy and atom probe tomography. A thermal treatment of as-grown homogeneous films leads to a phase separation process. The formation of SiO{sub 2} and HfO{sub 2} phases as well as pure Si one was revealed. This latter was found to be amorphous Si nanoclusters, distributed uniformly in the film volume. Their mean diameter and density were estimated to be about 2.8 nm and (2.9 {+-} 0.4) x 10{sup 17} Si-ncs/cm{sup 3}, respectively. The mechanism of the decomposition process was proposed. The obtained results pave the way for future microelectronic and photonic applications of Hf-based high-{kappa} dielectrics with embedded Si nanoclusters.

Talbot, E.; Roussel, M.; Genevois, C.; Pareige, P. [Groupe de Physique des Materiaux (GPM), Universite et INSA de Rouen, UMR CNRS 6634, Av. de l'Universite, BP 12, 76801 Saint Etienne du Rouvray (France); Khomenkova, L.; Portier, X.; Gourbilleau, F. [Centre de Recherche sur les Ions, les Materiaux et la Photonique (CIMAP), CEA/CNRS/ENSICAEN/UCBN, 6 Bd. Marechal Juin, 14050 Caen Cedex 4 (France)

2012-05-15T23:59:59.000Z

349

Observation of a P-associated defect in Hf O 2 nanolayers on (100)Si by electron spin resonance  

Science Journals Connector (OSTI)

Electron spin resonance analysis has detected a P-donor related point defect in nanometer-thick Hf O 2 films on (100)Si after annealing in the range of 500 – 900 ° C . Based on the principal g matrix (axial; g ? = 1.9965 ; g ? = 1.9975 ) and hyperfine tensor values ( A 1 = 1425 ± 10 G A 2 = 1245 ± 10 G and A 3 = 1160 ± 10 G ) inferred from consistent K - and Q -band spectrum simulations the center is assigned to a P 2 -type defect—a P substituting a Hf atom—similar to P 2 in silica where the unpaired spin is strongly localized on the P atom. The annealing impact is linked to the onset of crystallization enabling substitutional positioning of the P impurities. The centers may act as detrimental charge trapping sites.

K. Clémer; A. Stesmans; V. V. Afanas’ev

2007-01-01T23:59:59.000Z

350

Audit Report: Modular Office Facilities for Recovery Act Program Activities at the Hanford Site, OAS-RA-13-04  

Broader source: Energy.gov (indexed) [DOE]

U.S. Department of Energy U.S. Department of Energy Office of Inspector General Office of Audits and Inspections Audit Report Modular Office Facilities for Recovery Act Program Activities at the Hanford Site OAS-RA-L-13-04 July 2013 Department of Energy Washington, DC 20585 July 9, 2013 MEMORANDUM FOR THE MANAGER, RICHLAND OPERATIONS OFFICE FROM: David Sedillo, Director Western Audits Division Office of Inspector General SUBJECT: INFORMATION: Audit Report on "Modular Office Facilities for Recovery Act Program Activities at the Hanford Site" BACKGROUND The Department of Energy's Richland Operations Office (Richland) awarded a contract, effective October 1, 2008, to CH2M HILL Plateau Remediation Company (CHPRC) to remediate select portions of the Hanford Site's Central Plateau. As part of the American Recovery and

351

Special Inquiry on the Office of the Chief Financial Officer's Information Technology Expenditures, OAS-RA-L-12-01  

Broader source: Energy.gov (indexed) [DOE]

Special Inquiry on the Office of the Special Inquiry on the Office of the Chief Financial Officer's Information Technology Expenditures OAS-RA-L-12-01 November 2011 Department of Energy Washington, DC 20585 November 28, 2011 MEMORANDUM FOR THE DEPUTY SECRETARY FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Special Report on "Inquiry on the Office of the Chief Financial Officer's Information Technology Expenditures" INTRODUCTION The Office of the Chief Financial Officer (OCFO) is responsible for ensuring the effective management and financial integrity of Department of Energy programs, projects, and resources. To achieve its mission, the OCFO develops, implements, and monitors policies and systems related to areas such as budget administration, program analysis, and strategic planning. The

352

The State of Nevada's Implementation of the Energy Efficiency and Conservation Block Grant Program, OAS-RA-12-02  

Broader source: Energy.gov (indexed) [DOE]

U.S. Department of Energy U.S. Department of Energy Office of Inspector General Office of Audits and Inspections Audit Report The State of Nevada's Implementation of the Energy Efficiency and Conservation Block Grant Program OAS-RA-12-02 November 2011 Department of Energy Washington, DC 20585 November 9, 2011 MEMORANDUM FOR THE ACTING ASSISTANT SECRETARY, ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: George W. Collard Assistant Inspector General for Audits Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The State of Nevada's Implementation of the Energy Efficiency and Conservation Block Grant Program" BACKGROUND The American Recovery and Reinvestment Act of 2009 (Recovery Act) was enacted to stimulate the U.S. economy, create jobs and reduce energy consumption. Under the

353

Costs Incurred by Selected Tribal Energy Efficiency and Conservation Block Grant Recipients, OAS-RA-13-28  

Broader source: Energy.gov (indexed) [DOE]

Costs Incurred by Selected Tribal Costs Incurred by Selected Tribal Energy Efficiency and Conservation Block Grant Recipients OAS-RA-13-28 July 2013 Department of Energy Washington, DC 20585 July 18, 2013 MEMORANDUM FOR THE ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Audit Report on "Costs Incurred by Selected Tribal Energy Efficiency and Conservation Block Grant Recipients" BACKGROUND Under the American Recovery and Reinvestment Act of 2009 (Recovery Act), the Department of Energy's (Department) Energy Efficiency and Conservation Block Grant (EECBG) Program received $3.2 billion to improve energy efficiency and reduce energy use and fossil fuel

354

The Status of Energy Efficiency and Conservation Block Grant Recipients' Obligations, OAS-RA-11-16  

Broader source: Energy.gov (indexed) [DOE]

Management Alert Management Alert The Status of Energy Efficiency and Conservation Block Grant Recipients' Obligations OAS-RA-11-16 September 2011 Department of Energy Washington, DC 20585 September 1, 2011 MEMORANDUM FOR THE SECRETARY FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Management Alert on "The Status of Energy Efficiency and Conservation Block Grant Recipients' Obligations" IMMEDIATE CONCERN Because of the unprecedented level of funding provided under the American Recovery and Reinvestment Act of 2009 (Recovery Act) and the risks associated with spending such sums in a compressed period of time, the Office of Inspector General initiated a series of audits of the activities of the recipients of Department of Energy Energy Efficiency and Conservation Block

355

Identification of coronal holes and filament channels in SDO/AIA 193\\r{A} images via geometrical classification methods  

E-Print Network [OSTI]

In this study, we describe and evaluate shape measures for distinguishing between coronal holes and filament channels as observed in Extreme Ultraviolet (EUV) images of the Sun. For a set of well-observed coronal hole and filament channel regions extracted from SDO/AIA 193\\r{A} images we analyze their intrinsic morphology during the period 2011 to 2013, by using well known shape measures from the literature and newly developed geometrical classification methods. The results suggest an asymmetry in the morphology of filament channels giving support for the sheared arcade or weakly twisted flux rope model for filaments. We find that the proposed shape descriptors have the potential to reduce coronal hole classification errors and are eligible for screening techniques in order to improve the forecasting of solar wind high-speed streams from coronal hole observations in solar EUV images.

Reiss, M; Rotter, T; Hofmeister, S J; Veronig, A M

2014-01-01T23:59:59.000Z

356

Waste Disposal and Recovery Act Efforts at the Oak Ridge Reservation,OAS-RA-L-12-01  

Broader source: Energy.gov (indexed) [DOE]

Waste Disposal and Recovery Act Waste Disposal and Recovery Act Efforts at the Oak Ridge Reservation INS-RA-L-12-01 December 2011 Department of Energy Washington, DC 20585 December 16, 2011 MEMORANDUM FOR THE MANAGER, OAK RIDGE OFFICE FROM: Sandra D. Bruce Assistant Inspector General for Inspections Office of Inspector General SUBJECT: INFORMATION: Inspection Report on "Waste Disposal and Recovery Act Efforts at the Oak Ridge Reservation" BACKGROUND The Department of Energy's (Department) expends billions of dollars to clean up contaminated sites and dispose of hazardous waste. The Department's Oak Ridge Office (ORO) is responsible for processing and disposing of the Transuranic (TRU) waste on the Oak Ridge Reservation (ORR), including approximately 3,500 cubic meters of legacy remote-handled (RH) and contact-

357

First in-beam observation of excited states in {sup 156}{sub 72}Hf{sub 84} using the recoul-decay tagging method  

SciTech Connect (OSTI)

Excited states in the proton rich nuclide {sup 156}{sub 72}Hf{sub 84} were observed for the first time using the {sup 102}({sup 58}Ni, 2p2n){sup 156}Hf reaction at 270 MeV. Gamma rays were detected with the AYEBALL array of Compton suppressed Ge detectors, placed in front of the Fragment Mass Analyzer, and were assigned to individual reaction charmers using the Recoil-Decay Tagging Method. Prompt {gamma}-ray cascades were associated with the alpha decay of both the ground state and the 8{sup +} isomeric state in {sup 156}Hf. The level scheme constructed for {sup 156}Hf is compared with level schemes of lighter even-even N=84 isotones and is discussed within the framework of the Shell Model.

Seweryniak, D.; Ahmad, H.; Amro, D.J. [and others

1996-12-31T23:59:59.000Z

358

Self-assembly of Ni nanocrystals on HfO{sub 2} and N-assisted Ni confinement for nonvolatile memory application  

SciTech Connect (OSTI)

We demonstrate memory property using Ni nanocrystals with mean diameter of 9 nm embedded in HfO{sub 2} high-k dielectric that are formed via a self-assembly process by sputtering and rapid thermal annealing. X-ray photoelectron spectroscopy shows that Ni penetrates into the 5 nm HfO{sub 2} after high temperature annealing above 800 deg. C in N{sub 2}. However, the diffusion is suppressed by N incorporation into HfO{sub 2} by NH{sub 3} annealing. Metal-oxide-semiconductor structures were fabricated with Ni nanocrystals embedded in HfO{sub 2}. An additional counterclockwise hysteresis of 2.1 V due to the charge trapping properties of the Ni nanocrystals was observed from a {+-}5 V sweep during capacitance-voltage electrical measurement.

Tan, Zerlinda; Samanta, S.K.; Yoo, Won Jong; Lee, Sungjoo [Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 (Singapore)

2005-01-03T23:59:59.000Z

359

New Coordination Compounds of Cd(AsF6)2 with HF and XeF2  

Science Journals Connector (OSTI)

New Coordination Compounds of Cd(AsF6)2 with HF and XeF2 ... The total fluoride content (Ftotal-) was determined after complete decomposition of the sample by fusion with KNaCO3. ... Raman spectra of the powdered samples in sealed quartz capillaries were recorded on a Renishaw Raman Imaging Microscope System 1000 by use of the 632.8 nm exciting line of a He?Ne laser. ...

Gašper Tav?ar; Primož Benki?; Boris Žemva

2004-01-21T23:59:59.000Z

360

Calculations of the cross sections for the neutron acceleration, slowing down, and capture by the isomer "OmHf  

E-Print Network [OSTI]

Calculations of the cross sections for the neutron acceleration, slowing down, and capture for the isomer lsomHf in the energy range of the incoming neutron from 1keV to 5 MeV. Below 0.7 MeV the energy transferred to the neutron in the collision is positive on the average, i.e., the isomer is acting

Shlyakhter, Ilya

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Solvated Electrons in Very Small Clusters of Polar Molecules: (HF)(3)(-): art. no. 143001  

SciTech Connect (OSTI)

A cluster of polar molecules can host an excess electron in at least two ways. First, the excess electron can be tethered to the cluster by its interaction with the cluster?s dipole moment. , Second, the electron can localize inside the cluster, bulk analogs being the hydrated and ammoniated electrons. - While the structural reorganization of the cluster, due to attachment of an excess electron, is typically small for dipole-bound electrons (dbe), it is usually quite significant for''solvated electrons'' (se), since the solvation occurs at the expense of breaking of pre-existing hydrogen bonds. The se structures, however, provide more contact interactions between the polar molecules and the excess electron. For these reasons, it is often assumed that dbe's dominate for small polar clusters, whereas large clusters form se's. Here we show that dbe's and se's coexist in as small a cluster as (HF)3-. The stability of these anions with respect to the neutral cluster results not only from the excess electron binding energy but also from favorable entropic effects, which reflect the greater ''floppiness'' of the anionic structures.

Gutowski, Maciej S. (BATTELLE (PACIFIC NW LAB)); Hall, C (Arizona, University Of); Adamowicz, L (Arizona, University Of); Hendricks, J.H. (Johns Hopkins Univ); De Clercq, Helen (Howard University); Lyapustina, S.A. (Johns Hopkins Univ); Nilles, J.M. (Johns Hopkins Univ); Xu, S.J. (Johns Hopkins Univ); Bowen Jr., K.H. (Johns Hopkins Univ)

2001-12-01T23:59:59.000Z

362

Temperature dependent structural, optical and hydrophobic properties of sputtered deposited HfO{sub 2} films  

SciTech Connect (OSTI)

Hafnium oxide being high-k dielectric has been successfully utilized in electronic and optical applications. Being thermodynamically stable and having good mechanical strength, it can be used as a protective coating for outdoor HV insulators which are suffering from surface flashover problem due to contamination. In this paper, we are investigating the effect of substrate temperature on structural, optical and hydrophobic properties of hafnium oxide coating deposited over glass insulators by DC magnetron sputtering. X-ray diffraction is applied to determine the crystalline phase and crystallite size of the film. The morphology of the samples is examined using atomic force microscopy. The optical properties are studied using UV-vis-NIR spectrophotometer. The wettability of the film is investigated using contact angle meter. The thickness is measured using surface profilometer and verified through optical data. The relationship between substrate temperature with grain size, roughness, refractive index, and hydrophobicity is manifested. The maximum contact angle for HfO{sub 2} film was found to be 106° at 400°C.

Dave, V. [Department of Electrical Engineering, IIT Roorkee (India); Institute Instrumentation Centre, IIT Roorkee (India); Dubey, P.; Chandra, R. [Institute Instrumentation Centre, IIT Roorkee (India); Gupta, H. O. [Department of Electrical Engineering, IIT Roorkee (India)

2014-01-28T23:59:59.000Z

363

Numerical simulation of a Q-switched cw chemical HF laser  

SciTech Connect (OSTI)

A mathematical model of a Q-switched cw chemical laser is developed. The model is based on a simplified description of the active medium and the exact wave description of the mode structure of radiation. The model is used to study numerically the spatial-angular parameters of the output beam of a HF laser. We considered an unstable cavity that provided a high stability of the axis of the laser-pulse radiation pattern upon Q-switching with the help of a rotating mirror. The results of numerical simulation showed that for typical dimensions of a plane or an unstable cavity of the positive branch in a cw chemical laser, the angular radiation divergence rapidly changes in time and on average exceeds the diffraction limit by an order of magnitude. The problem can be solved by replacing a rotating mirror Q switch by a fixed one with time-dependent transmission. We also considered a negative-branch unstable cavity which can provide a stable radiation divergence upon Q-switching produced by a rotating mirror. (lasers)

Kuprenyuk, V I [Institute for Laser Physics, Federal State Unitary Enterprise ' Scientific and Industrial Corporation 'Vavilov State Optical Institute', St. Petersburg (Russian Federation); Maksimov, Yurii P; Mashendzhinov, Viktor I; Rotinyan, Mikhail A; Fedorov, Igor' A [Russian Science Centre 'Applied Chemistry', St Petersburg (Russian Federation); Rodionov, A Yu

2007-03-31T23:59:59.000Z

364

Early (? 4.5 Ga) formation of terrestrial crust: Lu–Hf, ?18O, and Ti thermometry results for Hadean zircons  

Science Journals Connector (OSTI)

Large deviations in ?Hf(T) from bulk silicate Earth seen in > 4 Ga detrital zircons from Jack Hills, Western Australia, have been interpreted as reflecting a major differentiation of the silicate Earth at 4.4 to 4.5 Ga. We have expanded the characterization of 176Hf/177Hf initial ratios (Hf) in Hadean zircons by acquiring a further 116 laser ablation Lu–Hf measurements on 87 grains with ion microprobe 207Pb/206Pb ages up to 4.36 Ga. Most measurements employed concurrent Lu–Hf and 207Pb/206Pb analyses, permitting assessment of the age of the volumetrically larger domain sampled by laser drilling against the spatially more restricted ion microprobe ages. Our new results confirm and extend the earlier observation of significant negative deviations in ?Hf(T) throughout the Hadean, although no positive ?Hf(T) values were documented in this study. Monte Carlo modelling of these data yields an essentially uniform spectrum of model ages between 4.56 and 4.20 Ga for extraction of the zircons' protoliths from a chondritic reservoir. To assess whether the five data plotting close to solar system initial Hf (Hfo) are statistically robust, we derived the error propagation equation for a parameter, ?o, which measures the difference of a sample from Hfo. Our analysis suggests that this limited data is indicative of source sequestration in a crustal-type Lu/Hf environment prior to 4.5 Ga. Oxygen isotope data and Ti thermometry from Hadean zircons show little obvious correlation with Hf, consistent with their derivation through fusion of a broad suite of crustal rock types under water-saturated conditions. Together with other isotopic and trace element data obtained from these ancient zircons, our results indicate essentially continuous derivation of crust from the mantle from 4.5 to 4.2 Ga with concurrent recycling into the mantle and internal crustal re-working. These results represent further evidence that by 4.35 Ga, portions of the crust had taken on continental characteristics.

T. Mark Harrison; Axel K. Schmitt; Malcolm T. McCulloch; Oscar M. Lovera

2008-01-01T23:59:59.000Z

365

Features of the band structure and conduction mechanisms in the n-HfNiSn semiconductor heavily doped with Ru  

SciTech Connect (OSTI)

The crystal and electronic structure and energy and kinetic properties of the n-HfNiSn semiconductor heavily doped with a Ru acceptor impurity are investigated in the temperature and Ru concentration ranges T = 80–400 K and N{sub A}{sup Ru} ? 9.5 × 10{sup 19}?5.7 × 10{sup 20} cm{sup ?3} (x = 0–0.03), respectively. The mechanism of structural-defect generation is established, which changes the band gap and degree of compensation of the semiconductor and consists in the simultaneous concentration reduction and elimination of donor structural defects by means of the displacement of ?1% of Ni atoms from the Hf (4a) positions, the generation of acceptor structural defects upon the substitution of Ru atoms for Ni atoms in the 4c positions, and the generation of donor defects in the form of vacancies in the Sn (4b) positions. The calculated electronic structure of HfNi{sub 1?x}Ru{sub x}Sn is consistent with the experiment. The results obtained are discussed within the Shklovsky-Efros model for a heavily doped and compensated semiconductor.

Romaka, V. A., E-mail: vromaka@polynet.lviv.ua [National Academy of Sciences of Ukraine, Pidstrygach Institute for Applied Problems in Mechanics and Mathematics (Ukraine); Rogl, P. [Universität Wien, Institut für Physikalische Chemie (Austria); Romaka, V. V. [National University Lvivska Politekhnika (Ukraine); Stadnyk, Yu. V. [Ivan Franko National University of Lviv (Ukraine); Korzh, R. O.; Krayovskyy, V. Ya. [National University Lvivska Politekhnika (Ukraine); Horyn, A. M. [Ivan Franko National University of Lviv (Ukraine)

2014-12-15T23:59:59.000Z

366

Highly efficient dye-sensitized solar cells based on HfO{sub 2} modified TiO{sub 2} electrodes  

SciTech Connect (OSTI)

Graphical abstract: Display Omitted Highlights: ? HfO{sub 2} has been used to modify TiO{sub 2} electrodes in dye sensitized solar cells. ? HfO{sub 2} layer increases the dye adsorption. ? Diffusion coefficient (D{sub e}) and lifetime (?{sub e}) of the photoelectrons were increased. ? Solar cell efficiency (?) was greatly improved from 5.67 to 9.59%. -- Abstract: In this article, we describe the use of hafnium oxide (HfO{sub 2}) as a new and efficient blocking layer material to modify TiO{sub 2} electrodes in dye sensitized solar cells. Different thicknesses of HfO{sub 2} over-layers were prepared by simple dip coating from two different precursors and their effects on the performance of DSSCs were studied. The HfO{sub 2} modification remarkably increases dye adsorption, resulting from the fact that the surface of HfO{sub 2} is more basic than that of TiO{sub 2}. Furthermore, the HfO{sub 2} coating demonstrated increased diffusion coefficient (D{sub e}) and lifetime (?{sub e}) of the photoelectrons, indicating the improved retardation of the back electron transfer, which increases short-circuit current (J{sub sc}) and open-circuit voltage (V{sub oc}). Thereby, the photo conversion efficiency (?) of the solar cell was greatly improved from 5.67 to 9.59% (an improvement of 69.02%) as the HfO{sub 2} layer was coated over TiO{sub 2} films.

Ramasamy, Parthiban [Department of Chemistry and GETRC, Kongju National University, 182 Singkwan, Kongju, Chungnam 314-701 (Korea, Republic of)] [Department of Chemistry and GETRC, Kongju National University, 182 Singkwan, Kongju, Chungnam 314-701 (Korea, Republic of); Kang, Moon-Sung; Cha, Hyeon-Jung [Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan-si, Chungnam 330-720 (Korea, Republic of)] [Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan-si, Chungnam 330-720 (Korea, Republic of); Kim, Jinkwon, E-mail: jkim@kongju.ac.kr [Department of Chemistry and GETRC, Kongju National University, 182 Singkwan, Kongju, Chungnam 314-701 (Korea, Republic of)] [Department of Chemistry and GETRC, Kongju National University, 182 Singkwan, Kongju, Chungnam 314-701 (Korea, Republic of)

2013-01-15T23:59:59.000Z

367

Structure and dielectric properties of La{sub x}Hf{sub (1?x)}O{sub y} thin films: The dependence of components  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: • La{sub x}Hf{sub (1?x)}O{sub y} thin films were grown by pulse laser deposition method. • The thin film with 10% La/(La + Hf) atom ratio forms a cubic HfO{sub 2} phase. • The amorphous thin films due to more La introduced have almost same local structure. • The main infrared phonon modes move to lower frequency for the amorphous thin films. • The static dielectric constants of the amorphous thin films increase with La content. - Abstract: La{sub x}Hf{sub (1?x)}O{sub y} (x = 0, 0.1, 0.3, 0.5, 0.7, y=2?(1/2)x) thin films were grown by pulsed laser deposition (PLD) method. The component dependence of the structure and vibration properties of these thin films is studied by combining X-ray diffraction, X-ray absorption fine structure (XAFS) and infrared spectroscopy. The thin film with 10% La/(La + Hf) atom ratio forms a cubic HfO{sub 2} phase and it has the largest static dielectric constant. More La atoms introduced cause amorphous phase formed and the static dielectric constants increase with the La content. Although XAFS indicates that these amorphous thin films have almost same local structures, the infrared phonon modes with most contribution to the static dielectric constant move to lower frequency, which results in the component dependence of the dielectric constant.

Qi, Zeming, E-mail: zmqi@ustc.edu.cn [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029 (China); Cheng, Xuerui [Department of Technology and Physics, Zhengzhou University of Light Industry, Zhengzhou, Henan 450002 (China); Zhang, Guobin [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029 (China); Li, Tingting [Institute of Microelectronics of Chinese Academy of Science, Beijing 100029 (China); Wang, Yuyin; Shao, Tao; Li, Chengxiang; He, Bo [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029 (China)

2013-07-15T23:59:59.000Z

368

Electroerosion resistance and structural phase transformations in electrospark and laser deposition of titanium alloys using composite ceramics based on ZrB2-ZrSi2 and TiN-Cr3C2 systems  

Science Journals Connector (OSTI)

The paper examines the mass transfer kinetics, structure, phase and chemical compositions, and micromechanical properties of electrospark and laser coatings on titanium alloys (including...2-ZrSi2 and TiN-Cr3C2 s...

I. A. Podchernyaeva; A. D. Panasyuk…

2008-01-01T23:59:59.000Z

369

Methane Combustion over Pd/ZrO2/SiC, Pd/CeO2/SiC, Pd/Zr0.5Ce0.5O2/SiC Catalysts  

E-Print Network [OSTI]

1 Methane Combustion over Pd/ZrO2/SiC, Pd/CeO2/SiC, Pd/Zr0.5Ce0.5O2/SiC Catalysts Xiaoning Guo a Laboratory of Coal Conversion, Institute of Coal Chemistry, Taiyuan 030001, PR China b GREMI UMR6606 CNRS0.5O2 solid solution) modified Pd/SiC catalysts for methane combustion are studied. XRD and XPS

Paris-Sud XI, Université de

370

Heating Greenhouses1 D.E. Buffington, R.A. Bucklin, R.W. Henley and D.B. McConnell2  

E-Print Network [OSTI]

AE11 Heating Greenhouses1 D.E. Buffington, R.A. Bucklin, R.W. Henley and D.B. McConnell2 1 supplemental heat is required. Obviously there are many ways this can be accomplished from the standpoint of these factors be considered when selecting and installing a heating system. HEATING SYSTEMS Greenhouse heating

Watson, Craig A.

371

Do I Have The Right Electronic Forms For My Application? NIH's electronic Research Administration (eRA) periodically implements updated versions of SF424 (R&R) grant  

E-Print Network [OSTI]

(eRA) periodically implements updated versions of SF424 (R&R) grant application forms in order to remain current with the most recent form sets available through Grants.gov and approved by the Office funding opportunity announcements (FOAs) via new application packages. Applicants use the "Apply for Grant

Baker, Chris I.

372

Comment on `Update of 40K and 226Ra and 232Th series $\\gamma$-to-dose conversion factors for soil'  

E-Print Network [OSTI]

A letter to the editor of the Journal of Environmental Radioactivity on the article: E. Gasser, A. Nachab, A. Nourreddine, Ch. Roy, and A. Sellam, `Update of 40K and 226Ra and 232Th series $\\gamma$-to-dose conversion factors for soil', J. Environ. Radioactiv. 138, 68-71 (2014), DOI: 10.1016/j.jenvrad.2014.08.002.

Malins, Alex; Saito, Kimiaki

2015-01-01T23:59:59.000Z

373

Certain peculiarities of Zr?Cr?N coatings on steel blades of a gas-turbine engine compressor  

Science Journals Connector (OSTI)

The properties of compressor blades of a helicopter gas-turbine engine with an experimental ionplasma coating Zr? ... -resistant, and mitigate the dependence of their residual properties on the amplitude and the ...

V. A. Styazhkin; A. A. Kopylov; S. Ya. Paleeva; Yu. G. Veksler…

374

H.C. DORLAND, N.J. BEUKES, J. GUTZMER, D.A.D. EVANS AND R.A. ARMSTRONG SOUTH AFRICAN JOURNAL OF GEOLOGY, 2006, VOLUME 109 PAGE 139-156  

E-Print Network [OSTI]

H.C. DORLAND, N.J. BEUKES, J. GUTZMER, D.A.D. EVANS AND R.A. ARMSTRONG SOUTH AFRICAN JOURNAL.evans@yale.edu R.A. Armstrong Research School of Earth Sciences, Australian National University, Canberra, Australia e-mail: Richard.Armstrong@anu.edu.au © 2006 March Geological Society of South Africa ABSTRACT

375

DENSITY-FUNCTIONAL STUDY OF U-Mo AND U-Zr ALLOYS  

SciTech Connect (OSTI)

Density-functional theory previously used to describe phase equilibria in U-Zr alloys [A. Landa, P. Soederlind, P.E.A. Turchi, J. Alloys Comp. 478 (2009) 103-110] is extended to investigate the ground-state properties of U-Mo solid solutions. We discuss how the heat of formation in both alloys correlates with the charge transfer between the alloy components, and how the specific behavior of the density of states in the vicinity of the Fermi level promotes the stabilization of the U{sub 2}Mo compound. Our calculations prove that, due to the existence of a single {gamma}-phase over the typical fuel operation temperatures, {gamma}-U-Mo alloys should indeed have much lower constituent redistribution than {gamma}-U-Zr alloys for which binodal decomposition causes a high degree of constituent redistribution.

Landa, A; Soderlind, P; Turchi, P A

2010-11-01T23:59:59.000Z

376

Quantum Phase Transitions in the Itinerant Ferromagnet ZrZn2  

Science Journals Connector (OSTI)

We report a study of the ferromagnetism of ZrZn2, the most promising material to exhibit ferromagnetic quantum criticality, at low temperatures T as a function of pressure p. We find that the ordered ferromagnetic moment disappears discontinuously at pc=16.5???kbar. Thus a tricritical point separates a line of first order ferromagnetic transitions from second order (continuous) transitions at higher temperature. We also identify two lines of transitions of the magnetization isotherms up to 12 T in the p-T plane where the derivative of the magnetization changes rapidly. These quantum phase transitions (QPT) establish a high sensitivity to local minima in the free energy in ZrZn2, thus strongly suggesting that QPT in itinerant ferromagnets are always first order.

M. Uhlarz; C. Pfleiderer; S. M. Hayden

2004-12-14T23:59:59.000Z

377

Devitrification kinetics and phase selection mechanisms in Cu-Zr metallic glasses  

SciTech Connect (OSTI)

Metallic glasses have been a promising class of materials since their discovery in the 1960s. Indeed, remarkable chemical, mechanical and physical properties have attracted considerable attention, and several excellent reviews are available. Moreover, the special group of glass forming alloys known as the bulk metallic glasses (BMG) become amorphous solids even at relatively low cooling rates, allowing them to be cast in large cross sections, opening the scope of potential applications to include bulk forms and net shape structural applications. Recent studies have been reported for new bulk metallic glasses produced with lower cooling rates, from 0.1 to several hundred K/s. Some of the application products of BMGs include sporting goods, high performance springs and medical devices. Several rapid solidification techniques, including melt-spinning, atomization and surface melting have been developed to produce amorphous alloys. The aim of all these methods is to solidify the liquid phase rapidly enough to suppress the nucleation and growth of crystalline phases. Furthermore, the production of amorphous/crystalline composite (ACC) materials by partial crystallization of amorphous precursor has recently given rise to materials that provide better mechanical and magnetic properties than the monolithic amorphous or crystalline alloys. In addition, these advances illustrate the broad untapped potential of using the glassy state as an intermediate stage in the processing of new materials and nanostructures. These advances underlie the necessity of investigations on prediction and control of phase stability and microstructural dynamics during both solidification and devitrification processes. This research presented in this dissertation is mainly focused on Cu-Zr and Cu-Zr-Al alloy systems. The Cu-Zr binary system has high glass forming ability in a wide compositional range (35-70 at.% Cu). Thereby, Cu-Zr based alloys have attracted much attention according to fundamental research on the behaviors of glass forming alloys. Further motivation arising from the application of this system as a basis for many BMGs and ACC materials; the Cu-Zr system warrants this attention and offers great potential for the development of new materials. However, the prediction and control of microstructural evolution during devitrification remains challenging because of the complex devitrification behavior of the Cu-Zr binary alloy which is arising from the competition of metastable and stable phases and diversity of crystal structures. This dissertation details a systematic fundamental investigation into the mechanisms and kinetics of the various crystallization transformation processes involved in the overall devitrification response of Cu-Zr and Cu-Zr-Al glasses. Various isothermal and nonisothermal treatments are employed, and the structural response is characterized using bulk X-ray and thermal analysis methods as well as nanoscale microscopic analysis methods, revealing structural and chemical details down to the atomic-scale. By carefully combining techniques such as differential scanning calorimetry (DSC), in-situ synchrotron high energy X-ray diffraction (HEXRD), and transmission electron microscopy (TEM) to quantify the characterization transformations, this research has uncovered numerous details concerning the atomistic mechanisms of crystallization and has provided much new understanding related to the dominant phases, the overall reaction sequences, and the rate-controlling mechanisms. As such this work represents a substantial step forward in understanding these transformations and provides a clear framework for further progress toward ultimate application of controlled devitrification processing for the production of new materials with remarkable properties.

Kalay, Ilkay

2010-12-15T23:59:59.000Z

378

Air Oxidation Kinetics for Zr-based Alloys [Corrosion and Mechanics of  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Air Oxidation Kinetics for Air Oxidation Kinetics for Zr-based Alloys Capabilities Materials Testing Environmentally Assisted Cracking (EAC) of Reactor Materials Corrosion Performance/Metal Dusting Overview Light Water Reactors Fatigue Testing of Carbon Steels and Low-Alloy Steels Environmentally Assisted Cracking of Ni-Base Alloys Irradiation-Induced Stress Corrosion Cracking of Austenitic Stainless Steels Steam Generator Tube Integrity Program Air Oxidation Kinetics for Zr-based Alloys Fossil Energy Fusion Energy Metal Dusting Publications List Irradiated Materials Steam Generator Tube Integrity Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Corrosion and Mechanics of Materials Light Water Reactors Bookmark and Share

379

Thermal response of Ru electrodes in contact with SiO{sub 2} and Hf-based high-k gate dielectrics  

SciTech Connect (OSTI)

A systematic experimental evaluation of the thermal stability of Ru metal gate electrodes in direct contact with SiO{sub 2} and Hf-based dielectric layers was performed and correlated with electrical device measurements. The distinctly different interfacial reactions in the Ru/SiO{sub 2}, Ru/HfO{sub 2}, and Ru/HfSiO{sub x} film systems were observed through cross-sectional high-resolution transmission electron microscopy, high angle annular dark field scanning transmission electron microscopy with electron-energy-loss spectra, and energy dispersive x-ray spectra analysis. Ru interacted with SiO{sub 2}, but remained stable on HfO{sub 2} at 1000 deg. C. The onset of Ru/SiO{sub 2} interfacial interactions is identified via silicon substrate pitting possibly from Ru diffusion into the dielectric in samples exposed to a 900 deg. C/10-s anneal. The dependence of capacitor device degradation with decreasing SiO{sub 2} thickness suggests Ru diffuses through SiO{sub 2}, followed by an abrupt, rapid, nonuniform interaction of ruthenium silicide as Ru contacts the Si substrate. Local interdiffusion detected on Ru/HfSiO{sub x} samples may be due to phase separation of HfSiO{sub x} into HfO{sub 2} grains within a SiO{sub 2} matrix, suggesting that SiO{sub 2} provides a diffusion pathway for Ru. Detailed evidence consistent with a dual reaction mechanism for the Ru/SiO{sub 2} system at 1000 deg. C is presented.

Wen, H.-C.; Lysaght, P.; Alshareef, H.N.; Huffman, C.; Harris, H.R.; Choi, K.; Senzaki, Y.; Luan, H.; Majhi, P.; Lee, B.H.; Campin, M. J.; Foran, B.; Lian, G.D.; Kwong, D.-L. [SEMATECH, 2706 Montopolis Drive, Austin, Texas 78741(United States); University of Texas at Austin, Pickle Research Campus-Microelectronics and Engineering Research (PRC-MER) Building 2.606A/R9950, Austin, Texas 78712 (United States); SEMATECH, 2706 Montopolis Drive, Austin, Texas 78741 (United States); Advanced Technology Development Facility (ATDF) Inc., 2706 Montopolis Drive, Austin, Texas 78741 (United States); University of Texas at Austin, Pickle Research Campus-Microelectronics and Engineering Research (PRC-MER) Building 2.606A/R9950, Austin, Texas 78712 (United States)

2005-08-15T23:59:59.000Z

380

Critical cooling rate and thermal stability of Zr--Ti--Cu--Ni--Be alloys  

SciTech Connect (OSTI)

The critical cooling rate as well as the thermal stability are measured for a series of alloys in the Zr--Ti--Cu--Ni--Be system. Upon cooling from the molten state with different rates, alloys with compositions ranging along a tie line from (Zr{sub 70}Ti{sub 30}){sub 55}(Ni{sub 39}Cu{sub 61}){sub 25}Be{sub 20} to (Zr{sub 85}Ti{sub 15}){sub 55}(Ni{sub 57}Cu{sub 43}){sub 22.5}Be{sub 27.5} show a continuous increase in the critical cooling rate to suppress crystallization. In contrast, thermal analysis of the same alloys shows that the undercooled liquid region, the temperature difference between the glass transition temperature and the crystallization temperature, is largest for some compositions midway between the two endpoints, revealing that glass forming ability does not correlate with thermal stability. The relationship between the composition-dependent glass forming ability and thermal stability is discussed with reference to a chemical decomposition process.

Waniuk, Theodore A.; Schroers, Jan; Johnson, William L.

2001-02-26T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Investigations of the g{sub K}-factors in the {sup 175,177,179}Hf Isotopes  

SciTech Connect (OSTI)

In this paper the intrinsic g{sub K} and effective spin g{sub s} factors of the odd-mass {sup 175-179}Hf isotopes have been investigated within the Tamm-Dancoff approximation by using the realistic Saxon-Woods potential. The theoretically calculated g{sub K} and g{sub s}{sup eff} values are compared with experimental data. The comparison of the measured and calculated values of the effective g{sub s} factor shows that the spin polarization explains quite well the observed reduction of g{sub s} from its free-nucleon value.

Yakut, Hakan; Kuliev, Ali [Sakarya University, Department of physics, Sakarya (Turkey); Guliyev, Ekber [National Academy of Sciences, Institute of Physics, Baku (Azerbaijan)

2008-11-11T23:59:59.000Z

382

Transient phenomena in the dielectric breakdown of HfO{sub 2} optical films probed by ultrafast laser pulse pairs  

SciTech Connect (OSTI)

The laser induced breakdown threshold of HfO{sub 2} films is studied with single pairs of pulses of variable delay and 50 fs and 1 ps pulse duration. Two distinct transient regimes are observed that can be related to the relaxation of the electron density from the conduction band via an intermediate state to the valence band. The experimental results are in good agreement with a theoretical model that assumes occupation of mid gap states after the first pulse on a time scale of several tens of picoseconds and subsequent decay of this population via recombination with holes in the valence band on a time scale of several tens of milliseconds.

Nguyen, Duy N.; Emmert, Luke A.; Rudolph, Wolfgang [Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Patel, Dinesh; Menoni, Carmen S. [Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80523 (United States)

2010-11-08T23:59:59.000Z

383

Controlled oxygen vacancy induced p-type conductivity in HfO{sub 2-x} thin films  

SciTech Connect (OSTI)

We have synthesized highly oxygen deficient HfO{sub 2-x} thin films by controlled oxygen engineering using reactive molecular beam epitaxy. Above a threshold value of oxygen vacancies, p-type conductivity sets in with up to 6 times 10{sup 21} charge carriers per cm{sup 3}. At the same time, the band-gap is reduced continuously by more than 1 eV. We suggest an oxygen vacancy induced p-type defect band as origin of the observed behavior.

Hildebrandt, Erwin; Kurian, Jose; Mueller, Mathis M.; Kleebe, Hans-Joachim; Alff, Lambert [Institute of Materials Science, Technische Universitaet Darmstadt, 64287 Darmstadt (Germany); Schroeder, Thomas [IHP, 15236 Frankfurt/Oder (Germany)

2011-09-12T23:59:59.000Z

384

Room temperature strain rate sensitivity in precursor derived HfO{sub 2}/Si-C-N(O) ceramic nanocomposites  

SciTech Connect (OSTI)

Investigation on the room temperature strain rate sensitivity using depth sensing nanoindentation is carried out on precursor derived HfO{sub 2}/Si-C-N(O) ceramic nanocomposite sintered using pulsed electric current sintering. Using constant load method the strain rate sensitivity values are estimated. Lower strain rate sensitivity of ? 3.7 × 10{sup ?3} is observed and the limited strain rate sensitivity of these ceramic nanocomposites is explained in terms of cluster model. It is concluded that presence of amorphous Si-C-N(O) clusters are responsible for the limited flowability in these ceramics.

Sujith, Ravindran; Kumar, Ravi, E-mail: nvrk@iitm.ac.in [Materials Processing Section, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai-600036, India. (India)] [Materials Processing Section, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai-600036, India. (India)

2014-01-15T23:59:59.000Z

385

Physical properties and band structure of reactive molecular beam epitaxy grown oxygen engineered HfO{sub 2{+-}x}  

SciTech Connect (OSTI)

We have conducted a detailed thin film growth structure of oxygen engineered monoclinic HfO{sub 2{+-}x} grown by reactive molecular beam epitaxy. The oxidation conditions induce a switching between (111) and (002) texture of hafnium oxide. The band gap of oxygen deficient hafnia decreases with increasing amount of oxygen vacancies by more than 1 eV. For high oxygen vacancy concentrations, defect bands form inside the band gap that induce optical transitions and p-type conductivity. The resistivity changes by several orders of magnitude as a function of oxidation conditions. Oxygen vacancies do not give rise to ferromagnetic behavior.

Hildebrandt, Erwin; Kurian, Jose; Alff, Lambert [Institute of Materials Science, Technische Universitaet Darmstadt, 64287 Darmstadt (Germany)

2012-12-01T23:59:59.000Z

386

Energy band alignment of atomic layer deposited HfO{sub 2} on epitaxial (110)Ge grown by molecular beam epitaxy  

SciTech Connect (OSTI)

The band alignment properties of atomic layer HfO{sub 2} film deposited on epitaxial (110)Ge, grown by molecular beam epitaxy, was investigated using x-ray photoelectron spectroscopy. The cross-sectional transmission electron microscopy exhibited a sharp interface between the (110)Ge epilayer and the HfO{sub 2} film. The measured valence band offset value of HfO{sub 2} relative to (110)Ge was 2.28 {+-} 0.05 eV. The extracted conduction band offset value was 2.66 {+-} 0.1 eV using the bandgaps of HfO{sub 2} of 5.61 eV and Ge bandgap of 0.67 eV. These band offset parameters and the interface chemical properties of HfO{sub 2}/(110)Ge system are of tremendous importance for the design of future high hole mobility and low-power Ge-based metal-oxide transistor devices.

Hudait, M. K.; Zhu, Y. [Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061 (United States)] [Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061 (United States); Maurya, D.; Priya, S. [Center for Energy Harvesting Materials and Systems (CEHMS), Virginia Tech, Blacksburg, Virginia 24061 (United States)] [Center for Energy Harvesting Materials and Systems (CEHMS), Virginia Tech, Blacksburg, Virginia 24061 (United States)

2013-03-04T23:59:59.000Z

387

Photo-induced tunneling currents in MOS structures with various HfO{sub 2}/SiO{sub 2} stacking dielectrics  

SciTech Connect (OSTI)

In this study, the current conduction mechanisms of structures with tandem high-k dielectric in illumination are discussed. Samples of Al/SiO{sub 2}/Si (S), Al/HfO{sub 2}/SiO{sub 2}/Si (H), and Al/3HfO{sub 2}/SiO{sub 2}/Si (3H) were examined. The significant observation of electron traps of sample H compares to sample S is found under the double bias capacitance-voltage (C-V) measurements in illumination. Moreover, the photo absorption sensitivity of sample H is higher than S due to the formation of HfO{sub 2} dielectric layer, which leads to larger numbers of carriers crowded through the sweep of V{sub G} before the domination of tunneling current. Additionally, the HfO{sub 2} dielectric layer would block the electrons passing through oxide from valance band, which would result in less electron-hole (e{sup ?}-h{sup +}) pairs recombination effect. Also, it was found that both of the samples S and H show perimeter dependency of positive bias currents due to strong fringing field effect in dark and illumination; while sample 3H shows area dependency of positive bias currents in strong illumination. The non-uniform tunneling current through thin dielectric and through HfO{sub 2} stacking layers are importance to MOS(p) tunneling photo diodes.

Pang, Chin-Sheng; Hwu, Jenn-Gwo, E-mail: jghwu@ntu.edu.tw [Graduate Institute of Electronics Engineering/Department of Electrical Engineering, National Taiwan University, Taipei, 10617, Taiwan (China)] [Graduate Institute of Electronics Engineering/Department of Electrical Engineering, National Taiwan University, Taipei, 10617, Taiwan (China)

2014-04-15T23:59:59.000Z

388

Effect of ceria loading on the carbon formation during low temperature methane steam reforming over a Ni/CeO2/ZrO2 catalyst  

Science Journals Connector (OSTI)

The characterization and catalytic activity of a Ni/CeO2/ZrO2 catalyst for methane steam reforming at 600°C were investigated. The addition...

Anton Purnomo; Susan Gallardo; Leonila Abella…

2008-12-01T23:59:59.000Z

389

RE/ZrO{sub 2} (RE = Sm, Eu) composite oxide nano-materials: Synthesis and applications in photocatalysis  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: • RE/ZrO{sub 2} (RE = Sm, Eu) nano-materials have been successfully synthesized. • Defect and electron structures determine the absorption properties on visible light. • Nano-sized Zr{sub 0.8}Sm{sub 0.2}O{sub 2??} has good visible-light-responsive photocatalytic activities. • In the future, it can be used in wastewater treatment and environmental protection. - Abstract: Zirconia modified by Samarium/Europium, RE/ZrO{sub 2} (RE = Sm, Eu), composite oxide nano-materials have been successfully synthesized by improved sol–gel method. Characterization results show that X-ray diffraction (XRD) peaks of products gradually shift to the lower angle with the increase of rare earth which implies that the lattice distances of RE/ZrO{sub 2} nano-materials are gradually enlarged. Moreover, the molar ratios between zirconium and rare earth are consistent with the chemical formula and both of them are uniformly distributed in samples. Optical properties indicate that defect structures and electron configurations of RE/ZrO{sub 2} (RE = Sm, Eu) with single phase determine their absorption properties on visible light. Photocatalytic experiments indicate Zr{sub 0.8}Sm{sub 0.2}O{sub 2??} nano-crystals have excellent visible-light-responsive photocatalytic activities on Methylene blue and Rhodamine B which results from the special defect structure, suitable electronic configuration, and larger specific surface area. It follows that Zr{sub 0.8}Sm{sub 0.2}O{sub 2??} nano-crystals are new visible-light-responsive photocatalysts which can be applied in dye wastewater treatment and environmental protection in the future.

Du, Weimin, E-mail: duweimin75@gmail.com [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China); Zhu, Zhaoqiang [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China); College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001 (China); Zhang, Xiaofen; Wang, Dacheng; Liu, Donghe [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China); Qian, Xuefeng [School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240 (China); Du, Jimin, E-mail: djm@aynu.edu.cn [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China)

2013-10-15T23:59:59.000Z

390

The 12 GeV CEBAF Upgrade Project at Thomas Jefferson National Accelerator Facility, OAS-RA-L-11-13  

Broader source: Energy.gov (indexed) [DOE]

12 GeV CEBAF Upgrade 12 GeV CEBAF Upgrade Project at Thomas Jefferson National Accelerator Facility OAS-RA-L-11-13 September 2011 Department of Energy Washington, DC 20585 September 30, 2011 MEMORANDUM FOR THE DEPUTY DIRECTOR FOR SCIENCE PROGRAMS, OFFICE OF SCIENCE DIRECTOR, OFFICE OF RISK MANAGEMENT AND FINANCIAL POLICY, OFFICE OF THE CHIEF FINANCIAL OFFICER FROM: David Sedillo, Director NNSA & Science Audits Division Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The 12 GeV CEBAF Upgrade Project at Thomas Jefferson National Accelerator Facility" Audit Report Number: OAS-RA-L-11-13 BACKGROUND In September 2008, the Department of Energy's (Department) Office of Science approved a construction project to double the electron beam energy of the Continuous Electron Beam

391

People's Equal Action and Community Effort, Inc. Š Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-11-20  

Broader source: Energy.gov (indexed) [DOE]

People's Equal Action and People's Equal Action and Community Effort, Inc. - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-11-20 September 2011 Department of Energy Washington, DC 20585 September 30, 2011 MEMORANDUM FOR THE ACTING ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Examination Report on "People's Equal Action and Community Effort, Inc. - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009" Audit Report Number: OAS-RA-11-20 BACKGROUND The attached report presents the results of an examination of the People's Equal Action and

392

Action for a Better Community, Inc. … Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-11-21  

Broader source: Energy.gov (indexed) [DOE]

Action for a Better Community, Inc. - Action for a Better Community, Inc. - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-11-21 September 2011 Department of Energy Washington, DC 20585 September 30, 2011 MEMORANDUM FOR THE ACTING ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Examination Report on "Action for a Better Community, Inc. - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009" Audit Report Number: OAS-RA-11-21 INTRODUCTION AND OBJECTIVE The attached report presents the results of an examination of Action for a Better Community's

393

All-order calculations of the spectra of Ba ii, Ra ii, Fr i, and superheavy elements E119 i and E120 ii  

Science Journals Connector (OSTI)

A technique based on summation of dominating classes of correlation diagrams to all orders in Coulomb interaction is used to calculate the energies of the lowest s,p, and d states of Ba ii, Ra ii, Fr i, E119 i, and E120 ii. Breit and quantum electrodynamic corrections are also included. Comparison with experiment for Ba ii, Ra ii, and Fr i demonstrates that the accuracy of the calculations is on the level of 0.1%. The technique has been applied to predict the spectra of superheavy elements E119 and E120+. The role of the ladder diagrams [Dzuba, Phys. Rev. A 78, 042502 (2008)], which is the most recent addition to the method, has been emphasized. Their inclusion significantly improves the accuracy of the calculations and expands the applicability of the method.

V. A. Dzuba

2013-10-28T23:59:59.000Z

394

Neutron capture cross sections of /sup 178/,/sup 179/,/sup 180/Hf and the origin of nature's rarest stable isotope /sup 180/Ta  

SciTech Connect (OSTI)

The neutron capture cross sections of /sup 178/,/sup 179/,/sup 180/Hf were measured in the energy range 2.6 keV to 2 MeV. The average capture cross sections were derived and fitted in terms of strength functions. Resonance parameters for the observed resonances below 10 keV were determined by shape analysis. Maxwellian-averaged capture cross sections were computed for thermal energies with kT between 5 and 100 keV. The cross sections for kT = 30 keV were used to determine the population probability of the 8- isomeric level in /sup 180/Hf by neutron capture as (1.24 +- 0.06)% and the r-process abundance of /sup 180/Hf as 0.0290 (Si = 10/sup 6/). These quantities served to analyze s- and r-process nucleosynthesis of /sup 180/Ta, nature's rarest stable isotope.

Beer, H.; Macklin, R.L.

1982-01-01T23:59:59.000Z

395

Electrical characteristics and thermal stability of HfO{sub 2} metal-oxide-semiconductor capacitors fabricated on clean reconstructed GaSb surfaces  

SciTech Connect (OSTI)

HfO{sub 2}/GaSb interfaces fabricated by high-vacuum HfO{sub 2} deposition on clean reconstructed GaSb surfaces were examined to explore a thermally stable GaSb metal-oxide-semiconductor structure with low interface-state density (D{sub it}). Interface Sb-O bonds were electrically and thermally unstable, and post-metallization annealing at temperatures higher than 200?°C was required to stabilize the HfO{sub 2}/GaSb interfaces. However, the annealing led to large D{sub it} in the upper-half band gap. We propose that the decomposition products that are associated with elemental Sb atoms act as interface states, since a clear correlation between the D{sub it} and the Sb coverage on the initial GaSb surfaces was observed.

Miyata, Noriyuki, E-mail: nori.miyata@aist.go.jp; Mori, Takahiro; Yasuda, Tetsuji [National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568 (Japan); Ohtake, Akihiro [National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044 (Japan); Ichikawa, Masakazu [The University of Tokyo, Tokyo 113-8656 (Japan)

2014-06-09T23:59:59.000Z

396

Effect of nitrogen incorporation on improvement of leakage properties in high-k HfO{sub 2} capacitors treated by N{sub 2}-plasma  

SciTech Connect (OSTI)

The nitrogen incorporation into the HfO{sub 2} films with an EOT (equivalent oxide thickness) of 9 A was performed by N{sub 2}-plasma to improve the electrical properties. The dielectric properties and a leakage current characteristics of the capacitors were investigated as a function of plasma power and plasma treatment temperature. The dielectric constant of the capacitors is not influenced by nitrogen incorporation. The N{sub 2}-plasma treatment at 300 deg. C and 70 W exhibits the most effective influence on improvement of the leakage current characteristics. Leakage current density of the capacitors treated at 300 deg. C and 70 W exhibits a half order of magnitude lower than that without plasma treatment. Nitrogen incorporated into the HfO{sub 2} films possesses the intrinsic effect that drastically reduce the electron leakage current through HfO{sub 2} dielectrics by deactivating the V{sub O} (oxygen vacancy) related gap states.

Seong, Nak-Jin; Yoon, Soon-Gil; Yeom, Seung-Jin; Woo, Hyun-Kyung; Kil, Deok-Sin; Roh, Jae-Sung; Sohn, Hyun-Chul [Department of Materials Science and Engineering, Chungnam National University, Daeduk Science Town, 305-764, Daejon (Korea, Republic of); Hynix Semiconductor Inc., San 136-1 Ami-ri Bubal-eub Icheon-si Kyoungki-do, 467-701 (Korea, Republic of)

2005-09-26T23:59:59.000Z

397

Demonstrating 1 nm-oxide-equivalent-thickness HfO{sub 2}/InSb structure with unpinning Fermi level and low gate leakage current density  

SciTech Connect (OSTI)

In this work, the band alignment, interface, and electrical characteristics of HfO{sub 2}/InSb metal-oxide-semiconductor structure have been investigated. By using x-ray photoelectron spectroscopy analysis, the conduction band offset of 1.78 ± 0.1 eV and valence band offset of 3.35 ± 0.1 eV have been extracted. The transmission electron microscopy analysis has shown that HfO{sub 2} layer would be a good diffusion barrier for InSb. As a result, 1 nm equivalent-oxide-thickness in the 4 nm HfO{sub 2}/InSb structure has been demonstrated with unpinning Fermi level and low leakage current of 10{sup ?4} A/cm{sup ?2}. The D{sub it} value of smaller than 10{sup 12} eV{sup ?1}cm{sup ?2} has been obtained using conduction method.

Trinh, Hai-Dang [Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, Taiwan (China) [Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, Taiwan (China); Department of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi (Viet Nam); Lin, Yueh-Chin; Nguyen, Hong-Quan; Luc, Quang-Ho [Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, Taiwan (China)] [Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, Taiwan (China); Nguyen, Minh-Thuy; Duong, Quoc-Van; Nguyen, Manh-Nghia [Department of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi (Viet Nam)] [Department of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi (Viet Nam); Wang, Shin-Yuan [Department of Electronic Engineering, National Chiao Tung University 1001, University Rd., Hsinchu 300, Taiwan (China)] [Department of Electronic Engineering, National Chiao Tung University 1001, University Rd., Hsinchu 300, Taiwan (China); Yi Chang, Edward [Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, Taiwan (China) [Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu, Taiwan (China); Department of Electronic Engineering, National Chiao Tung University 1001, University Rd., Hsinchu 300, Taiwan (China)

2013-09-30T23:59:59.000Z

398

Band alignment and interfacial structure of ZnO/Si heterojunction with Al{sub 2}O{sub 3} and HfO{sub 2} as interlayers  

SciTech Connect (OSTI)

Energy band alignment of ZnO/Si heterojunction with thin interlayers Al{sub 2}O{sub 3} and HfO{sub 2} grown by atomic layer deposition has been studied using x-ray photoelectron spectroscopy. The valence band offsets of ZnO/Al{sub 2}O{sub 3} and ZnO/HfO{sub 2} heterojunctions have been determined to be 0.43 and 0.22?eV, respectively. Accordingly, the band alignment ZnO/Si heterojunction is then modified to be 0.34 and 0.50?eV through inserting a thin Al{sub 2}O{sub 3} and HfO{sub 2} layer, respectively. The feasibility to tune the band structure of ZnO/Si heterojunction by selecting a proper interlayer shows great advantage in improving the performance of the ZnO-based optoelectronic devices.

Lu, Hong-Liang, E-mail: honglianglu@fudan.edu.cn; Yang, Ming; Xie, Zhang-Yi; Geng, Yang; Zhang, Yuan; Wang, Peng-Fei; Sun, Qing-Qing; Ding, Shi-Jin; Wei Zhang, David [State Key Laboratory of ASIC and System, Institute of Advanced Nanodevices, School of Microelectronics, Fudan University, Shanghai 200433 (China)

2014-04-21T23:59:59.000Z

399

Thickness-modulated optical dielectric constants and band alignments of HfO{sub x}N{sub y} gate dielectrics  

SciTech Connect (OSTI)

Thickness-modulated optical dielectric constants and band alignments of HfO{sub x}N{sub y} films grown by sputtering have been investigated by spectroscopic ellipsometry (SE) and x-ray photoelectron spectroscopy. Based on SE measurements, it has been noted that an increase in optical dielectric constant and band gap has been observed as a function of the film thickness. Analyses of thickness-dependent band alignment of the HfO{sub x}N{sub y}/Si system indicate that the valence band offset increases, but only slight change in the conduction band offset, resulting from the thickness-induced change in the structure. The suitable optical dielectric constants and band offsets relative to Si make sputtering-derived HfO{sub x}N{sub y} film a promising candidate for high-k gate dielectrics.

He, G.; Zhang, L. D.; Liu, M.; Zhang, J. P.; Wang, X. J. [Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructure, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China); Zhen, C. M. [Department of Physics, Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050016 (China)

2009-01-01T23:59:59.000Z

400

Influence of trimethylaluminum on the growth and properties of HfO{sub 2}/In{sub 0.53}Ga{sub 0.47}As interfaces  

SciTech Connect (OSTI)

The growth and the electrical properties of HfO{sub 2}/In{sub 0.53}Ga{sub 0.47}As interfaces are characterized as a function of exposure to trimethylaluminum (TMA) prior to chemical beam deposition of HfO{sub 2} from an alkoxide precursor. It is shown that TMA can act as a surfactant for HfO{sub 2} growth for (2x4) but not for the group-III-rich (4x2) reconstructed surfaces. The Fermi-level can be unpinned by postdeposition forming gas anneals only for interfaces that were exposed to low doses of TMA at low temperatures. The results are discussed in the context of the interaction between TMA and III-V surfaces.

Hwang, Yoontae; Stemmer, Susanne [Materials Department, University of California, Santa Barbara, California 93106-5050 (United States); Engel-Herbert, Roman [Department of Materials Science and Engineering, Pennsylvania State University, University Park Pennsylvania 16802 (United States)

2011-01-31T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

The effect of nanocrystallite size in monoclinic HfO{sub 2} films on lattice expansion and near-edge optical absorption  

SciTech Connect (OSTI)

Nanocrystalline monoclinic HfO{sub 2} films were sputter deposited on fused silica substrates, air annealed at 573 to 1273 K to affect crystallite growth, and analyzed by x-ray diffraction and spectrophotometry. Lattice expansion occurs with diminishing crystallite size. O 2p->Hf 5d interband absorption dominates the optical edge at energy E>=6.24 eV, with an optical band gap, E{sub o}=5.48+-0.023, which is independent of crystallite size. However, the strength of a localized resonant band, with onset at 5.65 eV and maximum at 5.94 eV, is affected by crystallite size. Its polaronic origin in a perfect HfO{sub 2} lattice is discussed.

Cisneros-Morales, M. C.; Aita, C. R. [Department of Chemistry and Biochemistry and the Advanced Coatings Experimental Laboratory, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

2010-05-10T23:59:59.000Z

402

In situ photoemission spectroscopy study on formation of HfO{sub 2} dielectrics on epitaxial graphene on SiC substrate  

SciTech Connect (OSTI)

High quality HfO{sub 2} dielectrics have been grown on epitaxial graphene on 4H-SiC substrates and have been studied by using in situ x-ray photoemission spectroscopy. The in situ thermal treatment shows that the HfO{sub 2}/graphene/4H-SiC heterojunctions have good thermal stability up to 650 deg. C. A shift of core-level spectra from graphene layer implies that charge transfer takes place at the interface. The high thermal stability and sufficient barrier heights between HfO{sub 2} and graphene indicate that high-k dielectric grown on graphene is very promising for the development of graphene-based electronic devices.

Chen, Q.; Huang, H.; Chen, W.; Wee, A. T. S.; Feng, Y. P. [Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore); Chai, J. W.; Zhang, Z.; Pan, J. S.; Wang, S. J. [Institute of Materials Research and Engineering, A-STAR (Agency for Science, Technology, and Research), 3 Research Link, Singapore 117602 (Singapore)

2010-02-15T23:59:59.000Z

403

Local structure around Er{sup 3+} in SiO{sub 2}-HfO{sub 2} glassy waveguides using EXAFS  

SciTech Connect (OSTI)

Er{sup 3+}-doped SiO{sub 2}-HfO{sub 2} glassy waveguides with HfO{sub 2} concentrations ranging from 10 to 50 mol % were prepared using the sol-gel route and deposited on v-SiO{sub 2} substrates using the dip-coating technique. The local environment around Er{sup 3+} ions was determined from Er L{sub 3}-edge extended x-ray-absorption fine-structure (EXAFS) measurements. The first coordination shell around Er{sup 3+} ions is composed of oxygen atoms. Hafnium is the main constituent of the second coordination shell of Er{sup 3+}, differing from the cases of pure SiO{sub 2} and SiO{sub 2}-TiO{sub 2} glassy hosts, in which silicon is the main atomic species. The local structure around Er{sup 3+} ions has been found to be independent on HfO{sub 2} concentration within the studied composition range. This fact implies that Er{sup 3+} ions are preferentially dispersed in HfO{sub 2}-rich regions of the glassy waveguide, even at the lowest HfO{sub 2} concentration. For all samples, no Er{sup 3+}-Er{sup 3+} coordination shell has been detected by EXAFS. The presented structural results allow us to understand some spectroscopic properties typical of Er{sup 3+}-doped SiO{sub 2} glassy waveguides co-doped with HfO{sub 2}.

Afify, N. D.; Dalba, G.; Armellini, C.; Ferrari, M.; Rocca, F.; Kuzmin, A. [Dipartimento di Fisica, Universita degli Studi di Trento, Via Sommarive 14, I-38100 Povo (Trento) (Italy); IFN-CNR, Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle Ricerche, Sezione FBK-CeFSA di Trento, Via alla Cascata 56/C, I-38100 Povo (Trento) (Italy); Institute of Solid State Physics, University of Latvia, LV-1063 RIGA (Latvia)

2007-07-01T23:59:59.000Z

404

Co.ra  

Office of Legacy Management (LM)

of these specimens is to be identical to the fabri- cation of similar pieces made for Argonne National laboratory. The gadolinium seaquioxide should be introduced with the uranium...

405

Diffusion-governed-asymmetric growth of amorphous layer under solid-state reaction in Ni-Zr multilayers  

SciTech Connect (OSTI)

A molecular-dynamics simulation with an n-body potential was performed to study solid-state amorphization in the Ni-Zr system upon annealing at medium temperatures ranging from 300 to 600 C. The models for simulation were a Zr-Ni-Zr sandwich consisting of both hcp Zr and fcc Ni (001) atomic planes and a bilayer with a thin preset disordered interfacial layer, respectively, for revealing the detailed amorphization process and the growing kinetics of an amorphous layer upon solid-state reaction. The simulation results demonstrated, for the first time, that the atomic process proceeded through first diffusion, then alloying and eventually amorphization. In other words, amorphization was controlled by a diffusion-limited reaction and the growth kinetics of the amorphous layer followed exactly a t{sup 1/2} law. Another interesting finding was that the growing speeds of the amorphous layer exhibited an asymmetric behavior, i.e, the amorphous layer extended faster towards Ni lattice than that directed to Zr side. Besides, it was also found that an initiation of amorphization upon annealing was dependent to the interfacial textures, i.e., amorphization could take place when the interfaces were composed of the more open atomic planes, whereas it was suppressed if the interfaces were constructed with the close-packed planes of both lattices.

Liu, B.X.; Lai, W.S. [Tsinghua Univ., Beijing (China). Dept. of Materials Science and Engineering

1998-12-31T23:59:59.000Z

406

Phase transformations, heat evolution, and atomic diffusion during slow heating of Al-rich Al/Zr multilayered foils  

SciTech Connect (OSTI)

We describe the energy and sequence of phase transformations in multilayered Al/Zr foils with atomic ratios of 3 Al:1 Zr during low temperature (<350?°C) heat treatments in a differential scanning calorimeter. The initial phase formed is an Al-rich amorphous phase that appears to grow by Zr diffusion through the amorphous phase. The subsequent nucleation and growth of tetragonal Al{sub 3}Zr along the Al/amorphous layer interface is mediated by Al diffusion through the crystalline intermetallic phase. Diffusion coefficients associated with these processes are higher than expected from reports of diffusivities measured at higher temperatures. The inferred heat of formation of the tetragonal Al{sub 3}Zr phase is 1240?±?40?J/g (53?±?2?kJ/mol atom). No anomalous variation in the energy or sequence of phase transformations is found with bilayer thickness for samples with bilayer thickness in the range of 17?nm to 90?nm despite anomalies in the bilayer dependence of self-propagating reaction velocities in the same foils.

Fisher, Kaitlynn; Barron, S. C.; Knepper, R.; Weihs, T. P., E-mail: weihs@jhu.edu [Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218-2689 (United States); Bonds, M. A.; Browning, N. D. [Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616 (United States); Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Livi, K. J. T. [High-Resolution Analytical Electron Microbeam Facility, Integrated Imaging Center, Johns Hopkins University, Baltimore, Maryland 21218 (United States); Campbell, G. H. [Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

2013-12-28T23:59:59.000Z

407

Beta-decay properties of Zr and Mo neutron-rich isotopes  

E-Print Network [OSTI]

Gamow-Teller strength distributions, beta-decay half-lives, and beta-delayed neutron emission are investigated in neutron-rich Zr and Mo isotopes within a deformed quasiparticle random-phase approximation. The approach is based on a self-consistent Skyrme Hartree-Fock mean field with pairing correlations and residual separable particle-hole and particle-particle forces. Comparison with recent measurements of half-lives stresses the important role that nuclear deformation plays in the description of beta-decay properties in this mass region.

P. Sarriguren; J. Pereira

2010-06-08T23:59:59.000Z

408

Status of solubility data for selected elements (U, Mp, Pu, Am, Te, Ni, and Zr)  

SciTech Connect (OSTI)

This report is an evaluation of solubility data for U, Np, Pu, Am, Tc, Ni and Zr compounds at ambient and elevated temperatures. We review the status of such data in light of the most recently reported experimental results. The focus is on the solid phases that may control solubilities under expected conditions in and near a potential nuclear waste repository at Yucca Mountain, Nevada. Solubility data or reliable predictions over the temperature range 20 to 150{degrees}C will be used in geochemical modeling studies of the Yucca Mountain Project [96PAL].

Moll, H.; Brachmann, A.; Wruck, D.; Palmer, C.

1997-09-07T23:59:59.000Z

409

Effect of nano-ZrO2 on microstructure and thermal shock behaviour of Al2O3/SiC composite ceramics used in solar thermal power  

Science Journals Connector (OSTI)

The Al2O3-ZrO2(3Y)-SiC composite ceramics used in solar thermal power were prepared by micrometric Al2O3, nano-ZrO2 and SiC powders under the condition of pressureless sintering. The bulk density and bending stre...

Xiaohong Xu ???; Guohao Jiao; Jianfeng Wu…

2011-04-01T23:59:59.000Z

410

Effects of fluorine incorporation into HfO{sub 2} gate dielectrics on InP and In{sub 0.53}Ga{sub 0.47}As metal-oxide-semiconductor field-effect-transistors  

SciTech Connect (OSTI)

In this work, the effects of fluorine (F) incorporation on electrical characteristics of HfO{sub 2}/InP and HfO{sub 2}/In{sub 0.53}Ga{sub 0.47}As gate stack are presented. F had been introduced into HfO{sub 2} gate dielectric by postgate CF{sub 4} plasma treatment, which was confirmed by x-ray photoelectron spectroscopy analysis and a secondary ion mass spectrometry technique. Compared to the control sample, fluorinated samples had great improvements in subthreshold swing, hysteresis, the normalized extrinsic transconductance, and the normalized drain current. These improvements can be attributed to the reduction in fixed charge in the HfO{sub 2} bulk and less interface trap density at the HfO{sub 2}/III-V interface.

Chen Yenting; Zhao Han; Wang Yanzhen; Xue Fei; Zhou Fei; Lee, Jack C. [Department of Electrical and Computer Engineering, Microelectronics Research Center, University of Texas at Austin, Texas 78758 (United States)

2010-06-21T23:59:59.000Z

411

Fundamental science investigations to develop a 6-MV laser triggered gas switch for ZR: first annual report.  

SciTech Connect (OSTI)

In October 2005, an intensive three-year Laser Triggered Gas Switch (LTGS) development program was initiated to investigate and solve observed performance and reliability issues with the LTGS for ZR. The approach taken has been one of mission-focused research: to revisit and reassess the design, to establish a fundamental understanding of LTGS operation and failure modes, and to test evolving operational hypotheses. This effort is aimed toward deploying an initial switch for ZR in 2007, on supporting rolling upgrades to ZR as the technology can be developed, and to prepare with scientific understanding for the even higher voltage switches anticipated needed for future high-yield accelerators. The ZR LTGS was identified as a potential area of concern quite early, but since initial assessments performed on a simplified Switch Test Bed (STB) at 5 MV showed 300-shot lifetimes on multiple switch builds, this component was judged acceptable. When the Z{sub 20} engineering module was brought online in October 2003 frequent flashovers of the plastic switch envelope were observed at the increased stresses required to compensate for the programmatically increased ZR load inductance. As of October 2006, there have been 1423 Z{sub 20} shots assessing a variety of LTGS designs. Numerous incremental and fundamental switch design modifications have been investigated. As we continue to investigate the LTGS, the basic science of plastic surface tracking, laser triggering, cascade breakdown, and optics degradation remain high-priority mission-focused research topics. Significant progress has been made and, while the switch does not yet achieve design requirements, we are on the path to develop successively better switches for rolling upgrade improvements to ZR. This report summarizes the work performed in FY 2006 by the large team. A high-level summary is followed by detailed individual topical reports.

Warne, Larry Kevin; Van Den Avyle, James A.; Lehr, Jane Marie; Rose, David (Voss Scientific, Albuquerque, NM); Krompholz, Hermann G. (Texas Tech University, Lubbock, TX); Vela, Russell (Texas Tech University, Lubbock, TX); Jorgenson, Roy Eberhardt; Timoshkin, Igor (University of Strathclyde, Glasgow, Scotland); Woodworth, Joseph Ray; Prestwich, Kenneth Randel (Voss Scientific, Albuquerque, NM); Krile, John (Texas Tech University, Lubbock, TX); Given, Martin (University of Strathclyde, Glasgow, Scotland); McKee, G. Randall; Rosenthal, Stephen Edgar; Struve, Kenneth William; Welch, Dale Robert (Voss Scientific, Albuquerque, NM); Benwell, Andrew L. (University of Missouri-Columbia, Columbia, Missouri); Kovaleski, Scott (University of Missouri-Columbia, Columbia, Missouri); LeChien, Keith, R.; Johnson, David (Titan Pulse Sciences Division); Fouracre, R.A. (University of Strathclyde, Glasgow, Scotland); Yeckel, Chris (University of Missouri-Columbia, Columbia, Missouri); Wakeland, Peter Eric (Ktech Corporation, Albuquerque, NM); Miller, A. R. (Titan Pulse Sciences Division); Hodge, Keith Conquest (Ktech Corporation, Albuquerque, NM); Pasik, Michael Francis; Savage, Mark Edward; Maenchen, John Eric; Curry, Randy D. (University of Missouri-Columbia, Columbia, Missouri); Feltz, Greg (Ktech Corporation, Albuquerque, NM); Bliss, David Emery; MacGregor, Scott (University of Strathclyde, Glasgow, Scotland); Corley, J. P. (Ktech Corporation, Albuquerque, NM); Anaya, Victor (Ktech Corporation, Albuquerque, NM); Wallace, Zachariah (Ktech Corporation, Albuquerque, NM); Thoma, Carsten (Voss Scientific, Albuquerque, NM); Neuber, Andreas. (Texas Tech University, Lubbock, TX)

2007-03-01T23:59:59.000Z

412

A High-Throughput Study of PtNiZr Catalysts for Application in PEM Fuel Cells  

SciTech Connect (OSTI)

The effects of adding Zr to PtNi oxygen reduction reaction (ORR) electrocatalyst alloys were examined in a study aimed at probing the possibility of creating catalysts with enhanced resistance to corrosion in a PEM fuel cell environment. Samples consisting of pure Pt or PtNiZr alloys with a range of compositions (not exceeding 11 at.% Zr) were fabricated using co-sputter deposition. A high-throughput fabrication approach was used wherein 18 distinct thin film catalyst alloy samples with varying compositions were deposited onto a large-area substrate with individual Au current collector structures. A multi-channel pseudo-potentiostat allowed for the simultaneous quantitative study of catalytic activity for all 18 electrodes in a single test bath, a first for the study of ORR electrocatalysts. A properly stirred oxygenated 1 M H{sub 2}SO{sub 4} electrolyte solution was used to provide each electrode with a steady-state flow of reactants during electrochemical evaluation. The onset potentials, absolute current density values, and Tafel analysis data obtained using this technique were compared with literature reports. The analyses showed that most PtNiZr alloys tested offered improvements over pure Pt, however those surfaces with a high mole fraction (>4 at.%) of Zr exhibited reduced activity that was roughly inversely correlated to the amount of Zr present. Film composition, morphology, and crystallographic properties were examined using X-ray energy dispersive spectroscopy (XEDS), X-ray photoelectron spectroscopy (XPS), SEM, and synchrotron X-ray diffraction. These data were then correlated with electrochemical data to elucidate the relationships between composition, structure, and relative performance for this ternary system.

Whitacre, J.F.; Valdez, T.I.; Narayanan, S.R.

2009-05-26T23:59:59.000Z

413

Production of elemental sulfur and ammonium thiosulfate by the oxidation of H2S containing water vapor and ammonia over V/Zr-PILC catalysts  

Science Journals Connector (OSTI)

The catalytic oxidation of hydrogen sulfide in the presence of water and ammonia was studied over V2O5 supported on Zr-pillared clay catalysts (V/Zr-PILCs). The synthesized catalysts were examined using a variety of characterization techniques. A catalytic performance study using V/Zr-PILC catalysts showed that H2S was successfully converted to elemental sulfur and ammonium thiosulfate (ATS) without considerable emission of sulfur dioxide. The H2S conversion over V/Zr-PILCs increased with increasing the content of vanadia up to 6 wt.%. This superior catalytic performance might be related to the uniform dispersion of vanadia species on the Zr-PILC support.

Kanattukara Vijayan Bineesh; Moon-il Kim; Goo-Hwa Lee; Manickam Selvaraj; Kyu Hyun; Dae-Won Park

2012-01-01T23:59:59.000Z

414

Intrinsic nanostructure in Zr2 xFe4Si16 y (x = 0.81, y = 6.06)  

SciTech Connect (OSTI)

We present a study of the crystal structure and physical properties of single crystals of a new Fe-based ternary compound, Zr2 xFe4Si16 y (x = 0.81, y = 6.06). Zr1.19Fe4Si9.94 is a layered compound, where stoichiometric -FeSi2-derived slabs are separated by Zr-Si planes with substantial numbers of vacancies. High resolution transmission electron microscopy (HRTEM) experiments show that these Zr-Si layers consist of 3.5 nm domains where the Zr and Si vacancies are ordered within a supercell sixteen times the volume of the stoichiometric cell. Within these domains, the occupancies of the Zr and Si sites obey symmetry rules that permit only certain compositions, none of which by themselves reproduce the average composition found in x-ray diffraction experiments. Magnetic susceptibility and magnetization measurements reveal a small but appreciable number of magnetic moments that remain freely fluctuating to 1.8 K, while neutron diffraction confirms the absence of bulk magnetic order with a moment of 0.2 B or larger down to 1.5 K. Electrical resistivity measurements find that Zr1.19Fe4Si9.94 is metallic, and the modest value of the Sommerfeld coefficient of the specific heat = C/T suggests that quasi-particle masses are not particularly strongly enhanced. The onset of superconductivity at Tc 6 K results in a partial resistive transition and a small Meissner signal, although a bulk-like transition is found in the specific heat. Sharp peaks in the ac susceptibility signal the interplay of the normal skin depth and the London penetration depth, typical of a system in which nano-sized superconducting grains are separated by a non-superconducting host. Ultra low field differential magnetic susceptibility measurements reveal the presence of a surprisingly large number of trace magnetic and superconducting phases, suggesting that the Zr-Fe-Si ternary system could be a potentially rich source of new bulk superconductors.

Smith, G J [Stony Brook University, Department of Physics and Astronomy; Simonson, Jack [Stony Brook University (SUNY); Prozorov, R. [Ames Laboratory and Iowa State University; Zhu, Y [Brookhaven National Laboratory (BNL); Aronson, M. [Stony Brook University, Department of Physics and Astronomy

2014-01-01T23:59:59.000Z

415

Repetitive Ultra-low Stress Induced Nanocrystallization in Amorphous Cu?Zr?Al Alloy Evidenced by in situ Nanoindentation  

E-Print Network [OSTI]

?Zr?Al Alloy Evidenced by in situ Nanoindentation Y. Liu a , J. Jian b , J.H. Lee b , C. Wang cd , Q.P. Cao cd , C. Gutierrez e , H. Wang ab , J.Z. Jiang cd & X. Zhang ae a Department of Materials Science and Engineering, Texas A&M University, College Station.... To cite this article: Y. Liu, J. Jian, J.H. Lee, C. Wang, Q.P. Cao, C. Gutierrez, H. Wang, J.Z. Jiang & X. Zhang (2014) Repetitive Ultra-low Stress Induced Nanocrystallization in Amorphous Cu?Zr?Al Alloy Evidenced by in situ Nanoindentation, Materials...

Liu, Y.; Jian, J.; Lee, J. H.; Wang, C.; Cao, Q. P.; Gutierrez, C.; Wang, H.; Jiang, J. Z.; Zhang, X.

2014-05-12T23:59:59.000Z

416

Pt4ZrO2/C cathode catalyst for improved durability in high temperature PEMFC based on H3PO4 doped PBI  

Science Journals Connector (OSTI)

In this paper, Pt4ZrO2/C was prepared and compared with commercial Pt/C (46.6 wt.% TKK) in terms of the durability as cathode catalyst in a high temperature proton exchange membrane fuel cell (PEMFC) based on H3PO4 doped polybenzimidazole (PBI) by a potential sweep test. The catalysts before and after the potential sweep test were characterized by rotating disk electrode (RDE), X-ray diffraction (XRD), transmission electron microscopy (TEM) and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). After 3000 cycles potential sweep test, the overall performance loss of the Pt4ZrO2/C membrane electrode assembly (MEA) was less than that of the Pt/C MEA. The RDE results demonstrated that the oxygen reduction reaction (ORR) activity of the as-prepared Pt4ZrO2/C is nearly the same as TKK-Pt/C. The XRD and TEM results showed that Pt4ZrO2/C catalyst presented higher sintering resistance than commercial Pt/C catalyst during the potential sweep test. This may be attributed to the addition of ZrO2, which acts an anchor to inhibit the adjacent platinum particles to agglomerate. The ICP-AES results of Pt4ZrO2/C cathode catalyst before and after the potential sweep test showed that the composition of Pt and Zr were very near the nominal atomic ratio of Pt:Zr, which reflected that Pt4ZrO2/C catalyst had a good stability during the potential sweep test. In brief, the preliminary results indicate that Pt4ZrO2/C catalyst is a good candidate of Pt/C catalyst in high temperature PEMFC based on H3PO4 doped PBI for achieving longer cell life-time and higher cell performance.

Gang Liu; Huamin Zhang; Yunfeng Zhai; Yu Zhang; Dongyan Xu; Zhi-gang Shao

2007-01-01T23:59:59.000Z

417

Deposition of TiN and HfO{sub 2} in a commercial 200 mm remote plasma atomic layer deposition reactor  

SciTech Connect (OSTI)

The authors describe a remote plasma atomic layer deposition reactor (Oxford Instruments FlexAL trade mark sign ) that includes an inductively coupled plasma source and a load lock capable of handling substrates up to 200 mm in diameter. The deposition of titanium nitride (TiN) and hafnium oxide (HfO{sub 2}) is described for the combination of the metal-halide precursor TiCl{sub 4} and H{sub 2}-N{sub 2} plasma and the combination of the metallorganic precursor Hf[N(CH{sub 3})(C{sub 2}H{sub 5})]{sub 4} and O{sub 2} plasma, respectively. The influence of the plasma exposure time and substrate temperature has been studied and compositional, structural, and electrical properties are reported. TiN films with a low Cl impurity content were obtained at 350 deg. C at a growth rate of 0.35 A /cycle with an electrical resistivity as low as 150 {mu}{omega} cm. Carbon-free (detection limit <2 at. %) HfO{sub 2} films were obtained at a growth rate of 1.0 A /cycle at 290 deg. C. The thickness and resisitivity nonuniformity was <5% for the TiN and the thickness uniformality was <2% for the HfO{sub 2} films as determined over 200 mm wafers.

Heil, S. B. S.; Hemmen, J. L. van; Hodson, C. J.; Singh, N.; Klootwijk, J. H.; Roozeboom, F.; Sanden, M. C. M. van de; Kessels, W. M. M. [Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands); Oxford Instruments Plasma Technology, North End, Yatton BS49 4AP (United Kingdom); Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven (Netherlands); NXP Semiconductors Research, High Tech Campus 4, 5656 AE Eindhoven (Netherlands); Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)

2007-09-15T23:59:59.000Z

418

Atomic layer deposition of Hf{sub x}Al{sub y}C{sub z} as a work function material in metal gate MOS devices  

SciTech Connect (OSTI)

As advanced silicon semiconductor devices are transitioning from planar to 3D structures, new materials and processes are needed to control the device characteristics. Atomic layer deposition (ALD) of Hf{sub x}Al{sub y}C{sub z} films using hafnium chloride and trimethylaluminum precursors was combined with postdeposition anneals and ALD liners to control the device characteristics in high-k metal-gate devices. Combinatorial process methods and technologies were employed for rapid electrical and materials characterization of various materials stacks. The effective work function in metal–oxide–semiconductor capacitor devices with the Hf{sub x}Al{sub y}C{sub z} layer coupled with an ALD HfO{sub 2} dielectric was quantified to be mid-gap at ?4.6?eV. Thus, Hf{sub x}Al{sub y}C{sub z} is a promising metal gate work function material that allows for the tuning of device threshold voltages (V{sub th}) for anticipated multi-V{sub th} integrated circuit devices.

Lee, Albert, E-mail: alee@intermolecular.com; Fuchigami, Nobi; Pisharoty, Divya; Hong, Zhendong; Haywood, Ed; Joshi, Amol; Mujumdar, Salil; Bodke, Ashish; Karlsson, Olov [Intermolecular, 3011 North First Street, San Jose, California 95134 (United States); Kim, Hoon; Choi, Kisik [GLOBALFOUNDRIES Technology Research Group, 257 Fuller Road, Albany, New York 12309 (United States); Besser, Paul [GLOBALFOUNDRIES, 1050 East Arques, Sunnyvale, California 94085 (United States)

2014-01-15T23:59:59.000Z

419

Ion-radical synergy in HfO{sub 2} etching studied with a XeF{sub 2}/Ar{sup +} beam setup  

SciTech Connect (OSTI)

To gain more insight into fundamental aspects of the etching behavior of Hf-based high-k materials in plasma etch reactors, HfO{sub 2} films were etched in a multiple-beam setup consisting of a low energy Ar{sup +} ion beam and a XeF{sub 2} radical beam. The etch rate and etch products were monitored by real-time ellipsometry and mass spectrometry, respectively. Although etching of HfO{sub 2} in XeF{sub 2}/Ar{sup +} chemistry is mainly a physical effect, an unambiguous proof of the ion-radical synergistic effect for the etching of HfO{sub 2} is presented. The etch yield for 400 eV Ar{sup +} ions at a substrate temperature of 300 deg. C was 0.3 atoms/ion for Ar{sup +} sputtering and increased to 2 atoms/ion when XeF{sub 2} was also supplied. The etch yield proved to follow the common square root of ion energy dependence both for pure sputtering and radical enhanced etching, with a threshold energy at room temperature of 69{+-}17 eV for Ar{sup +} ions and 54{+-}14 eV for Ar{sup +} ions with XeF{sub 2}.

Gevers, P. M.; Beijerinck, H. C. W.; Sanden, M. C. M. van de; Kessels, W. M. M. [Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)

2008-04-15T23:59:59.000Z

420

Band offsets of Al{sub 2}O{sub 3} and HfO{sub 2} oxides deposited by atomic layer deposition technique on hydrogenated diamond  

SciTech Connect (OSTI)

High-k oxide insulators (Al{sub 2}O{sub 3} and HfO{sub 2}) have been deposited on a single crystalline hydrogenated diamond (H-diamond) epilayer by an atomic layer deposition technique at temperature as low as 120 Degree-Sign C. Interfacial electronic band structures are characterized by X-ray photoelectron spectroscopy. Based on core-level binding energies and valence band maximum values, valence band offsets are found to be 2.9 {+-} 0.2 and 2.6 {+-} 0.2 eV for Al{sub 2}O{sub 3}/H-diamond and HfO{sub 2}/H-diamond heterojunctions, respectively. Band gaps of the Al{sub 2}O{sub 3} and HfO{sub 2} have been determined to be 7.2 {+-} 0.2 and 5.4 {+-} 0.2 eV by measuring O 1s energy loss spectra, respectively. Both the Al{sub 2}O{sub 3}/H-diamond and HfO{sub 2}/H-diamond heterojunctions are concluded to be type-II staggered band configurations with conduction band offsets of 1.2 {+-} 0.2 and 2.7 {+-} 0.2 eV, respectively.

Liu, J. W.; Liao, M. Y.; Imura, M. [Optical and Electronic Materials Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Koide, Y. [Optical and Electronic Materials Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Nanofabrication Platform, NIMS, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan); Center of Materials Research for Low Carbon Emission, NIMS, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

2012-12-17T23:59:59.000Z

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Addendum to ''Phase selection and transition in Hf-rich hafnia-titania nanolaminates'' (on SiO{sub 2}) [J. Appl. Phys. 109, 123523 (2011)]: Hafnon formation  

SciTech Connect (OSTI)

Continued investigation of hafnia-titania nanolaminates on silica substrates after long term annealing shows that hafnon (HfSiO{sub 4}) is formed, in addition to the previously reported phases. Here, a 293 nm-thick stack of 5 nm HfO{sub 2}-4 nm TiO{sub 2} bilayers (0.51 mole fraction HfO{sub 2}) is sputter deposited on fused SiO{sub 2} and annealed in air at 1173 K for up to 192 h and then at 1273 K for up to 96 h. X-ray diffraction shows that hafnon crystallizes after 24 h at 1273 K. Micro-Raman spectroscopy/microscopy shows that hafnon crystallization is heterogeneous. No film-substrate reaction is observed for single layer HfO{sub 2} on SiO{sub 2} annealed under similar conditions. We suggest the nanolaminate's complex annealed microstructure provides fast diffusion paths that enable hafnon formation.

Cisneros-Morales, Massiel Cristina; Aita, Carolyn Rubin [Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

2012-05-15T23:59:59.000Z

422

H.F. Diaz and R.S. Bradley (eds.), The Hadley Circulation: Present, Past and Future, 121152. 2005 Kluwer Academic Publishers. Printed in the Netherlands  

E-Print Network [OSTI]

121 H.F. Diaz and R.S. Bradley (eds.), The Hadley Circulation: Present, Past and Future, 121-SEA INTERACTION, AND THE RISING BRANCH OF THE HADLEY CIRCULATION Shang-Ping Xie International Pacific Research in the meridional direction is the ul- timate drive for the global Hadley circulation, dictating that its rising

Xie, Shang-Ping

423

ULF wave occurrence statistics in a high-latitude HF Doppler sounder D. M. Wright, T. K. Yeoman, T. B. Jones  

E-Print Network [OSTI]

ULF wave occurrence statistics in a high-latitude HF Doppler sounder D. M. Wright, T. K. Yeoman, T was to establish the optimum con®guration for a new high-latitude Doppler sounder experiment, called DOPE (Wright, 1996; Wright et al., 1997), and to determine the likelihood of the experiment observing pulsation eects

Paris-Sud XI, Université de

424

In situ study of HfO{sub 2} atomic layer deposition on InP(100)  

SciTech Connect (OSTI)

The interfacial chemistry of the native oxide and chemically treated InP samples during atomic layer deposition (ALD) HfO{sub 2} growth at 250 Degree-Sign C has been studied by in situ X-ray photoelectron spectroscopy. The In-oxide concentration is seen to gradually decrease on the native oxide and acid etched samples. No significant changes of the P-oxide concentrations are detected, while the P-oxides chemical states are seen to change gradually during the initial cycles of ALD on the native oxide and the chemically treated samples. (NH{sub 4}){sub 2}S treatment strongly decreases In-oxide and P-oxide concentrations prior to ALD and maintains low concentrations during the ALD process.

Dong, H.; Brennan, B.; Kim, J.; Hinkle, C. L.; Wallace, R. M. [Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, Texas 75080 (United States)] [Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, Texas 75080 (United States); Zhernokletov, D. [Department of Physics, University of Texas at Dallas, Richardson, Texas 75080 (United States)] [Department of Physics, University of Texas at Dallas, Richardson, Texas 75080 (United States)

2013-04-29T23:59:59.000Z

425

Interfacial Layer Growth Condition Dependent Carrier Transport Mechanisms in HfO2/SiO2 Gate Stacks  

SciTech Connect (OSTI)

The temperature and field dependent leakage current in HfO{sub 2}/SiO{sub 2} gate stack for in situ steam grown and chemical interfacial layers (ILs) are studied in the temperature range of 20 C to 105 C. Poole-Frenkel mechanism in high field whereas Ohmic conduction in low field region are dominant for both devices. Leakage current decreases whereas both trap energy level ({phi}{sub t}) and activation energy (E{sub a}) increase for chemically grown IL devices. The trap level energy, ({phi}{sub t}) -0.2 eV, indicates that doubly charged oxygen vacancies (V{sup 2-}) are the active electron traps which contribute to the leakage current in these gate stacks.

Sahoo, S. K.; Misra, D.

2012-06-04T23:59:59.000Z

426

Synthesis of ZrO{sub 2} nanoparticles by hydrothermal treatment  

SciTech Connect (OSTI)

Zirconium oxide (zirconia, ZrO{sub 2}) is the most common material used for electrolyte of solid oxide fuel cells (SOFCs). Zirconia has attracted attention for applications in optical coatings, buffer layers for growing superconductors, thermal-shield, corrosion resistant coatings, ionic conductors, and oxygen sensors, and for potential applications including transparent optical devices and electrochemical capacitor electrodes, fuel cells, catalysts, and advanced ceramics. In this work, zirconia particles were synthesized from ZrCl{sub 4} precursor with hydrothermal treatment in a batch reactor. Hydrothermal treatment may allow obtaining nanoparticles and sintered materials with controlled chemical and structural characteristics. Hydrothermal treatment was carried out at temperatures of 150 – 200°C with precursor concentration of 0.1 – 0.5 M. Zirconia particles obtained from this treatment were analyzed by using SEM, PSD and XRD to characterize the morphology, particle size distribution, and crystallinity, respectively. Based on the analysis, the size of zirconia particles were around 200 nm and it became smaller with decreasing precursor concentration. The increasing temperature caused the particles formed having uniform size. Zirconia particles formed by hydrothermal treatment were monoclinic, tetragonal and cubic crystal.

Machmudah, Siti, E-mail: machmudah@chem-eng.its.ac.id; Widiyastuti, W., E-mail: machmudah@chem-eng.its.ac.id; Prastuti, Okky Putri, E-mail: machmudah@chem-eng.its.ac.id; Nurtono, Tantular, E-mail: machmudah@chem-eng.its.ac.id; Winardi, Sugeng, E-mail: machmudah@chem-eng.its.ac.id [Chemical Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60111 (Indonesia); Wahyudiono,; Kanda, Hideki; Goto, Motonobu [Department of Chemical Engineering, Nagoya University, Nagoya 464-8603 (Japan)

2014-02-24T23:59:59.000Z

427

One-step fabrication of tetragonal ZrO2 particles by atmospheric pressure plasma jet  

Science Journals Connector (OSTI)

Abstract A novel atmospheric pressure plasma jet (APPJ) was applied to prepare the tetragonal zirconia particles via a solution of zirconyl (IV) nitrate hydrate (ZrO(NO3)2?xH2O) as the precursor. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The microstructure of zirconia was found to be an assembly of spherical particles with a tetragonal structure. The chemical composition of prepared zirconia particles was analyzed by XPS quantification study with an atomic ratio of O/Zr of 2.03 without nitrate residues. The results based on the one-particle-per-drop mechanism in an APPJ system also showed that the synthesis of tetragonal zirconia particles could be effectively achieved in one-step fabrication without the need for additional stabilizers or annealing process. Meanwhile, APPJ system has a great potential to be a cost-effective and time-saving process for particle production as compared to the wet chemical processes.

Yu-Ming Su; Yu-Lin Kuo; Chun-Ming Lin; Sun-Fen Lee

2014-01-01T23:59:59.000Z

428

Electrochemical studies of hydrogen storage in amorphous Ni[sub 64]Zr[sub 36] alloy  

SciTech Connect (OSTI)

The capacity of amorphous Ni-Zr alloys to absorb large amounts of hydrogen has been investigated recently in connection with their possible use for hydrogen storage. This property also makes them possible candidates as anodes in metal hydride-nickel hydroxide rechargeable batteries. The characteristic features of the electrochemical behavior of the amorphous Ni[sub 64]Zr[sub 36] alloy in alkaline media have been investigated. Changes occurring in both the physical state and the composition of the surface layer during chemical etching and electrochemical activation were studied by scanning electron microscopy, Auger electron spectroscopy, x-ray diffraction, and cyclic voltammetry. The kinetics of the hydrogen evolution reaction (HER) on the alloy under investigation was studied in terms of the cathodic polarization curves. The Tafel plots contain two different ranges: (i) a low-overpotential range, in which the slope of the linear [eta] versus log i is characteristic for charge transfer controlled processes; (ii) a high-overvoltage range, in which a combined mechanism, charge transfer and hydrogen diffusion into the bulk, is operative. To get information about the parameters influencing the hydrogen charging and discharging processes, chronopotentiometric experiments were performed. The changes of anodic overvoltage with time during constant current discharge were used to determine the electrochemical parameters i[sub 0] and [beta], as well as the diffusion coefficients (D) of the H atoms in the bulk of the alloy.

Ciureanu, M.; Ryan, D.H.; Stroem-Olsen, J.O. (McGill Univ., Montreal, Quebec (Canada)); Trudeau, M.L. (Hydro Quebec Research Inst., Varennes (Canada))

1993-03-01T23:59:59.000Z

429

Fuel element design for the enhanced destruction of plutonium in a nuclear reactor  

DOE Patents [OSTI]

A uranium-free fuel for a fast nuclear reactor comprising an alloy of Pu, Zr and Hf, wherein Hf is present in an amount less than about 10% by weight of the alloy. The fuel may be in the form of a Pu alloy surrounded by a Zr--Hf alloy or an alloy of Pu--Zr--Hf or a combination of both. 7 figs.

Crawford, D.C.; Porter, D.L.; Hayes, S.L.; Hill, R.N.

1999-03-23T23:59:59.000Z

430

Fuel element design for the enhanced destruction of plutonium in a nuclear reactor  

DOE Patents [OSTI]

A uranium-free fuel for a fast nuclear reactor comprising an alloy of Pu, Zr and Hf, wherein Hf is present in an amount less than about 10% by weight of the alloy. The fuel may be in the form of a Pu alloy surrounded by a Zr--Hf alloy or an alloy of Pu--Zr--Hf or a combination of both.

Crawford, Douglas C. (Idaho Falls, ID); Porter, Douglas L. (Idaho Falls, ID); Hayes, Steven L. (Idaho Falls, ID); Hill, Robert N. (Bolingbrook, IL)

1999-01-01T23:59:59.000Z

431

The Department of Energy's American Recovery and Reinvestment Act-Missouri State Energy Program, OAS-RA-L-12-06  

Broader source: Energy.gov (indexed) [DOE]

American American Recovery and Reinvestment Act - Missouri State Energy Program OAS-RA-L-12-06 July 2012 Department of Energy Washington, DC 20585 July 20, 2012 MEMORANDUM FOR THE ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Daniel M. Weeber, Director Eastern Audits Division Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's American Recovery and Reinvestment Act - Missouri State Energy Program" BACKGROUND The Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) provides grants to states, territories and the District of Columbia (states) to support their energy priorities through the State Energy Program (SEP). Funding is based on a grant formula that

432

Alleged Misuse of American Recovery and Reinvestment Act Grant Funds by the Western Arizona Council of Governments, INS-RA-12-01  

Broader source: Energy.gov (indexed) [DOE]

Alleged Misuse of American Alleged Misuse of American Recovery and Reinvestment Act Grant Funds by the Western Arizona Council of Governments INS-RA-12-01 February 2012 Department of Energy Washington, DC 20585 February 9, 2012 MEMORANDUM FOR THE ACTING ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Sandra D. Bruce Assistant Inspector General for Inspections Office of Inspector General SUBJECT: INFORMATION: Inspection Report on "Alleged Misuse of American Recovery and Reinvestment Act Grant Funds by the Western Arizona Council of Governments" BACKGROUND The Department of Energy's Weatherization Assistance Program received $5 billion under the American Recovery and Reinvestment Act of 2009 to improve the energy efficiency of homes,

433

County of Los Angeles Energy Efficiency and Conservation Block Grant Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-13-02  

Broader source: Energy.gov (indexed) [DOE]

County of Los Angeles - Energy County of Los Angeles - Energy Efficiency and Conservation Block Grant Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-13-02 October 2012 Department of Energy Washington, DC 20585 October 9, 2012 MEMORANDUM FOR THE ASSISTANT SECRETARY, ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audit Services Office of Inspector General SUBJECT: INFORMATION: Examination Report on "County of Los Angeles - Energy Efficiency and Conservation Block Grant Program Funds Provided by the American Recovery and Reinvestment Act of 2009" INTRODUCTION AND OBJECTIVE The attached report presents the results of an examination of the County of Los Angeles'

434

Cuyahoga County of Ohio Department of Development … Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-11-19  

Broader source: Energy.gov (indexed) [DOE]

Examination Report Examination Report Cuyahoga County of Ohio Department of Development - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-11-19 September 2011 Department of Energy Washington, DC 20585 September 29, 2011 MEMORANDUM FOR THE ACTING ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Examination Report on "Cuyahoga County of Ohio Department of Development - Weatherization Assistance Funds Provided by the American Recovery and Reinvestment Act of 2009" BACKGROUND The attached report presents the results of an examination of the Cuyahoga County of Ohio

435

Community Action Partnership of San Bernardino County Š Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-13-17  

Broader source: Energy.gov (indexed) [DOE]

Fresno Fresno U.S. Department of Energy Office of Inspector General Office of Audits and Inspections Examination Report Community Action Partnership of San Bernardino County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-13-17 March 2013 Department of Energy Washington, DC 20585 March 28, 2013 MEMORANDUM FOR THE ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Examination Report on "Community Action Partnership of San Bernardino County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment

436

The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Missouri (OAS-RA-11-11)  

Broader source: Energy.gov (indexed) [DOE]

Missouri Missouri OAS-RA-11-12 August 2011 Department of Energy Washington, DC 20585 August 22, 2011 MEMORANDUM FOR THE ACTING ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: George W. Collard Assistant Inspector General for Audits Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Missouri" BACKGROUND The Department of Energy's (Department) Weatherization Assistance Program (Weatherization Program) received $5 billion under the American Recovery and Reinvestment Act of 2009 (Recovery Act) to improve the energy efficiency of single family, multi-family, and mobile

437

The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the Commonwealth of Virginia, OAS-RA-11-14  

Broader source: Energy.gov (indexed) [DOE]

Commonwealth of Virginia Commonwealth of Virginia OAS-RA-11-14 August 2011 Department of Energy Washington, DC 20585 August 25, 2011 MEMORANDUM FOR THE SECRETARY FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the Commonwealth of Virginia" BACKGROUND In 2009, the Commonwealth of Virginia's (Virginia) Department of Housing and Community Development's (DHCD) Weatherization Assistance Program (Weatherization Program) was awarded a 3-year grant of approximately $94 million from the American Recovery and Reinvestment Act (Recovery Act) of 2009 to weatherize 9,193 homes. Virginia's DHCD

438

Fresno County Economic Opportunities Commission Š Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-13-11  

Broader source: Energy.gov (indexed) [DOE]

Fresno County Economic Fresno County Economic Opportunities Commission  Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-13-11 February 2013 Department of Energy Washington, DC 20585 February 19, 2013 MEMORANDUM FOR THE ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Examination Report on "Fresno County Economic Opportunities Commission - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009" BACKGROUND The attached report presents the results of an examination of the Fresno County Economic

439

The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Ohio, OAS-RA-12-13  

Broader source: Energy.gov (indexed) [DOE]

Weatherization Assistance Program Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Ohio OAS-RA-12-13 June 2012 Department of Energy Washington, DC 20585 June 25, 2012 MEMORANDUM FOR THE ASSISTANT SECRETARY, ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audit Services Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Ohio" INTRODUCTION AND OBJECTIVE Under the American Recovery and Reinvestment Act of 2009, the Department of Energy's Weatherization Assistance Program (Weatherization Program) received $5 billion to increase the

440

Western Area Power Administration's Control and Administration of American Recovery and Reinvestment Act Borrowing Authority, OAS-RA-12-01  

Broader source: Energy.gov (indexed) [DOE]

Management Alert Management Alert Western Area Power Administration's Control and Administration of American Recovery and Reinvestment Act Borrowing Authority OAS-RA-12-01 November 2011 Department of Energy Washington, DC 20585 November 4, 2011 MEMORANDUM FOR THE ADMINISTRATOR, WESTERN AREA POWER ADMINISTRATION FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Management Alert on "The Western Area Power Administration's Control and Administration of American Recovery and Reinvestment Act Borrowing Authority" IMMEDIATE CONCERN Despite internal control and administration issues with its first project authorized under its $3.25 billion American Recovery and Reinvestment Act of 2009 (Recovery Act) borrowing authority, the Department of Energy's (Department) Western Area Power Administration

Note: This page contains sample records for the topic "ra zr hf" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Area Community Services Employment and Training Council … Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-13-23  

Broader source: Energy.gov (indexed) [DOE]

Area Community Services Area Community Services Employment and Training Council - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-13-23 June 2013 Department of Energy Washington, DC 20585 June 18, 2013 MEMORANDUM FOR THE ASSISTANT SECRETARY FOR ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audits and Inspections Office of Inspector General SUBJECT: INFORMATION: Examination Report on "Area Community Services Employment and Training Council - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009"

442

The Department's Implementation of Financial Incentive Programs under the Energy Efficiency and Conservation Block Grant Program, OAS-RA-L-13-02  

Broader source: Energy.gov (indexed) [DOE]

Implementation of Implementation of Financial Incentive Programs under the Energy Efficiency and Conservation Block Grant Program OAS-RA-L-13-02 December 2012 Department of Energy Washington, DC 20585 December 3, 2012 MEMORANDUM FOR THE PROGRAM MANAGER, WEATHERIZATION AND INTERGOVERNMENTAL PROGRAM FROM: George W. Collard Assistant Inspector General for Audits Office of Inspector General SUBJECT: INFORMATION: Audit Report on "The Department's Implementation of Financial Incentive Programs under the Energy Efficiency and Conservation Block Grant Program" BACKGROUND The Department of Energy's (Department) Energy Efficiency and Conservation Block Grant (EECBG) Program, funded for the first time by the American Recovery and Reinvestment Act of

443

Ab initio full charge-density study of the atomic volume of ?-phase Fr, Ra, Ac, Th, Pa, U, Np, and Pu  

Science Journals Connector (OSTI)

We have used a full charge-density technique based on the linear muffin-tin orbitals method in first-principles calculations of the atomic volumes of the light actinides including Fr, Ra, and Ac in their low-temperature crystallographic phases. The good agreement between the theoretical and experimental values along the series support the picture of itinerant 5f electronic states in Th to Pu. The increased deviation between theory and experiment found in Np and Pu may be an indication of correlation effects not included in the local density approximation.

L. Vitos; J. Kollár; H. L. Skriver

1997-02-15T23:59:59.000Z

444

The Department of Energy's Clean Cities Alternative Fuel Vehicle Grant Program Funded under the American Recovery and Reinvestment Act, OAS-RA-12-12  

Broader source: Energy.gov (indexed) [DOE]

Clean Clean Cities Alternative Fuel Vehicle Grant Program Funded under the American Recovery and Reinvestment Act OAS-RA-12-12 May 2012 Department of Energy Washington, DC 20585 May 22, 2012 MEMORANDUM FOR THE SECRETARY FROM: Gregory H. Friedman Inspector General SUBJECT: INFORMATION: Audit Report on "The Department of Energy's Clean Cities Alternative Fuel Vehicle Grant Program Funded under the American Recovery and Reinvestment Act" INTRODUCTION AND OBJECTIVE Under the American Recovery and Reinvestment Act of 2009, the Department of Energy's Clean Cities Alternative Fuel Vehicle Grant Program (Clean Cities Program) received nearly $300 million, or 30 times its Fiscal Year 2009 funding of approximately $10 million. From this

445

Community Action Partnership of Orange County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009, OAS-RA-13-03  

Broader source: Energy.gov (indexed) [DOE]

Community Action Partnership of Community Action Partnership of Orange County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009 OAS-RA-13-03 October 2012 Department of Energy Washington, DC 20585 October 17, 2012 MEMORANDUM FOR THE ASSISTANT SECRETARY, ENERGY EFFICIENCY AND RENEWABLE ENERGY FROM: Rickey R. Hass Deputy Inspector General for Audit Services Office of Inspector General SUBJECT: INFORMATION: Examination Report on "Community Action Partnership of Orange County - Weatherization Assistance Program Funds Provided by the American Recovery and Reinvestment Act of 2009" BACKGROUND The attached report presents the results of an examination of the Community Action Partnership

446

Highly stable Ni catalyst supported on Ce–ZrO2 for oxy-steam reforming of methane  

Science Journals Connector (OSTI)

A novel catalyst, Ni/Ce–ZrO2..., exhibits very high catalytic activity and stability even in the stoichiometric steam reforming of methane (H2O/CH4...= 1). Furthermore, when it was employed in oxy-steam reforming

Hyun-Seog Roh; Ki-Won Jun; Wen-Sheng Dong; Sang-Eon Park…

2001-06-01T23:59:59.000Z

447

Thermal stability of ZrO2–SiO2 aerogel modified by Fe(III) ion  

Science Journals Connector (OSTI)

ZrO2–SiO2 aerogel modified by Fe(III) ion was prepared and the stability of the samples under high temperature was investigated. The structure and properties of modified aerogels were characterized by N2 adsorpti...

Rui Xiong; Xiaolei Li; Huiming Ji…

2014-08-01T23:59:59.000Z

448

Structural phase transition in ZrO2 induced by swift heavy ion irradiation at high pressure  

E-Print Network [OSTI]

Structural phase transition in ZrO2 induced by swift heavy ion irradiation at high pressure B transition becomes larger with increasing pressure. Keywords: Zirconia, phase transition, high pressure-temperature poly- morphs (tetragonal and cubic) (see Fig 1). At about 1200 C, a martensitic-type phase transition

Paris-Sud XI, Université de

449

Proton diffusion pathways and rates in Y-doped BaZrO3 solid oxide electrolyte from quantum mechanics  

E-Print Network [OSTI]

solid oxide fuel cells based on yttria-stabilized zirconia. In addition, doped perovskite oxides oftenProton diffusion pathways and rates in Y-doped BaZrO3 solid oxide electrolyte from quantum solid oxide proton conductors the principal fea- tures of the proton transport mechanism are generally

Goddard III, William A.

450

Kinetic Modeling of Slurry Propylene Polymerization using rac-Et(Ind)2ZrCl2/MAO  

E-Print Network [OSTI]

by the isospecific metallocene rac-Et(Ind)2ZrCl2/MAO was investigated using a semi-batch reactor. A full factorial using a systematic optimization strategy. The model predicts that the insertion of the first propylene such understanding and affords opportunities for optimization. Thermoplastic industries for polypropylene (PP

451

Pressure-induced pseudoatom bonding collapse and isosymmetric phase transition in Zr{sub 2}Cu: First-principles predictions  

SciTech Connect (OSTI)

The structural evolution of tetragonal Zr{sub 2}Cu has been investigated under high pressures up to 70 GPa by means of density functional theory. Our calculations predict a pressure-induced isosymmetric transition where the tetragonal symmetry (I4/mmm) is retained during the entire compression as well as decompression process while its axial ratio (c/a) undergoes a transition from ?3.5 to ?4.2 at around 35 GPa with a hysteresis width of about 4 GPa accompanied by an obvious volume collapse of 1.8% and anomalous elastic properties such as weak mechanical stability, dramatically high elastic anisotropy, and low Young's modulus. Crystallographically, the tetragonal axial ratio shift renders this transition analogous to a simple bcc-to-fcc structural transition, which implies it might be densification-driven. Electronically, the ambient Zr{sub 2}Cu is uncovered with an intriguing pseudo BaFe{sub 2}As{sub 2}-type structure, which upon the phase transition undergoes an electron density topological change and collapses to an atomic-sandwich-like structure. The pseudo BaFe{sub 2}As{sub 2}-type structure is demonstrated to be shaped by hybridized dxz + yz electronic states below Fermi level, while the high pressure straight Zr-Zr bonding is accommodated by electronic states near Fermi level with dx{sup 2} ? y{sup 2} dominant features.

Ning, Jinliang; Zhang, Xinyu, E-mail: xyzhang@ysu.edu.cn, E-mail: riping@ysu.edu.cn; Zhang, Suhong; Sun, Na; Wang, Limin; Ma, Mingzhen; Liu, Riping, E-mail: xyzhang@ysu.edu.cn, E-mail: riping@ysu.edu.cn [State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004 (China)] [State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004 (China)

2013-12-21T23:59:59.000Z

452

Atomistic calculations of the thermodynamic properties of mixing for tetravalent metal dioxide solid solutions: (Zr, Th, Ce)O{sub 2}  

SciTech Connect (OSTI)

The thermodynamic mixing properties for isometric Th{sub x}Ce{sub 1-x}O{sub 2}, Ce{sub x}Zr{sub 1-x}O{sub 2}, and Th{sub x}Zr{sub 1-x}O{sub 2} were determined using quantum-mechanical calculations and subsequent Monte-Carlo simulations. Although the Th{sub x}Ce{sub 1-x}O{sub 2} binary indicates exsolution below 600 K, the energy gain due to exsolution is small (E{sub exsoln}=1.5 kJ/(mol cations) at 200 K). The energy gain for exsolution is significant for the binaries containing Zr; at 1000 K, E{sub exsoln}=6 kJ/(mol cations) for the Ce{sub x}Zr{sub 1-x}O{sub 2} binary, and E{sub exsoln}=17 kJ/(mol cations) for the Th{sub x}Zr{sub 1-x}O{sub 2} binary. The binaries containing Zr have limited miscibility and cation ordering (at 200 K for x=0.5). At 1673 K, only 4.0 and 0.25 mol% ZrO{sub 2} can be incorporated into CeO{sub 2} and ThO{sub 2}, respectively. Solid-solution calculations for the tetragonal Th{sub x}Zr{sub 1-x}O{sub 2} binary show decreased mixing enthalpy due to the increased end-member stability of tetragonal ZrO{sub 2}. Inclusion of the monoclinic ZrO{sub 2} is predicted to further reduce the mixing enthalpy for binaries containing Zr. - Graphical abstract: Temperature-composition phase diagram showing miscibility gaps for the isometric Th{sub x}Ce{sub 1-x}O{sub 2}, isometric Ce{sub x}Zr{sub 1-x}O{sub 2}, isometric Th{sub x}Zr{sub 1-x}O{sub 2}, and tetragonal Th{sub x}Zr{sub 1-x}O{sub 2} binaries at low composition (0Zr{sub 1-x}O{sub 2}, and Ce{sub x}Zr{sub 1-x}O{sub 2} binaries are calculated. Black-Right-Pointing-Pointer Cation ordering is identified at low T for binaries containing ZrO{sub 2}. Black-Right-Pointing-Pointer Phase diagrams are estimated based on DFT and Monte-Carlo calculations. Black-Right-Pointing-Pointer DFT and Monte-Carlo calculations are in agreement with experimental (and previous computational) results, where available. Black-Right-Pointing-Pointer Increased thermodynamic stability of monoclinic and tetragonal ZrO{sub 2} end-member affects solid solution binaries.

Shuller-Nickles, L.C., E-mail: lshulle@clemson.edu [Environmental Engineering and Earth Science, Clemson University, 342 Computer Court, Anderson, SC 29625 (United States); Ewing, R.C., E-mail: rodewing@umich.edu [Earth and Environmental Sciences, University of Michigan, 1100 N. University Avenue, Ann Arbor, MI 48109 (United States); Becker, U., E-mail: ubecker@umich.edu [Earth and Environmental Sciences, University of Michigan, 1100 N. University Avenue, Ann Arbor, MI 48109 (United States)

2013-01-15T23:59:59.000Z

453

Pre- and post-irradiation characterization and properties measurements of ZrC coated surrogate TRISO particles  

SciTech Connect (OSTI)

Zirconium carbide is a candidate to either replace or supplement silicon carbide as a coating material in TRISO fuel particles for high temperature gas-cooled reactor fuels. Six sets of ZrC coated surrogate microsphere samples, fabricated by the Japan Atomic Energy Agency using the fluidized bed chemical vapor deposition method, were irradiated in the High Flux Isotope Reactor at the Oak Ridge National Laboratory. These developmental samples available for the irradiation experiment were in conditions of either as-fabricated coated particles or particles that had been heat-treated to simulate the fuel compacting process. Five sets of samples were composed of nominally stoichiometric compositions, with the sixth being richer in carbon (C/Zr = 1.4). The samples were irradiated at 800 and 1250 C with fast neutron fluences of 2 and 6 dpa. Post-irradiation, the samples were retrieved from the irradiation capsules followed by microstructural examination performed at the Oak Ridge National Laboratory's Low Activation Materials Development and Analysis Laboratory. This work was supported by the US Department of Energy Office of Nuclear Energy's Advanced Gas Reactor program as part of International Nuclear Energy Research Initiative collaboration with Japan. This report includes progress from that INERI collaboration, as well as results of some follow-up examination of the irradiated specimens. Post-irradiation examination items included microstructural characterization, and nanoindentation hardness/modulus measurements. The examinations revealed grain size enhancement and softening as the primary effects of both heat-treatment and irradiation in stoichiometric ZrC with a non-layered, homogeneous grain structure, raising serious concerns on the mechanical suitability of these particular developmental coatings as a replacement for SiC in TRISO fuel. Samples with either free carbon or carbon-rich layers dispersed in the ZrC coatings experienced negligible grain size enhancement during both heat treatment and irradiation. However, these samples experienced irradiation induced softening similar to stoichiometric ZrC samples.

Vasudevamurthy, Gokul [ORNL; Katoh, Yutai [ORNL; Hunn, John D [ORNL; Snead, Lance Lewis [ORNL

2010-09-01T23:59:59.000Z

454

Surface engineering of a Zr-based bulk metallic glass with low energy Ar- or Ca-ion implantation  

Science Journals Connector (OSTI)

Abstract In the present study, low energy ion implantation was employed to engineer the surface of a Zr-based bulk metallic glass (BMG), aiming at improving the biocompatibility and imparting bioactivity to the surface. Ca- or Ar-ions were implanted at 10 or 50 keV at a fluence of 8 × 1015 ions/cm2 to (Zr0.55Al0.10Ni0.05Cu0.30)99Y1 (at.%) BMG. The effects of ion implantation on material properties and subsequent cellular responses were investigated. Both Ar- and Ca-ion implantations were suggested to induce atom displacements on the surfaces according to the Monte-Carlo simulation. The change of atomic environment of Zr in the surface regions as implied by the alteration in X-ray absorption measurements at Zr K-edge. X-ray photoelectron spectroscopy revealed that the ion implantation process has modified the surface chemical compositions and indicated the presence of Ca after Ca-ion implantation. The surface nanohardness has been enhanced by implantation of either ion species, with Ca-ion implantation showing more prominent effect. The BMG surfaces were altered to be more hydrophobic after ion implantation, which can be attributed to the reduced amount of hydroxyl groups on the implanted surfaces. Higher numbers of adherent cells were found on Ar- and Ca-ion implanted samples, while more pronounced cell adhesion was observed on Ca-ion implanted substrates. The low energy ion implantation resulted in concurrent modifications in atomic structure, nanohardness, surface chemistry, hydrophobicity, and cell behavior on the surface of the Zr-based BMG, which were proposed to be mutually correlated with each other.

Lu Huang; Chao Zhu; Claudiu I. Muntele; Tao Zhang; Peter K. Liaw; Wei He

2015-01-01T23:59:59.000Z

455

N NE EX XT T G GE EN NE ER RA AT TI IO ON N S SA AF FE EG  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NE NE EX XT T G GE EN NE ER RA AT TI IO ON N S SA AF FE EG GU UA AR RD DS S I IN NI IT TI IA AT TI IV VE E ( (N NG GS SI I) ) O OP PP PO OR RT TU UN NI IT TI IE ES S F FO OR R S ST TU UD DE EN NT TS S A AN ND D Y YO OU UN NG G P PR RO OF FE ES SS SI IO ON NA AL LS S I IN NT TE ER RE ES ST TE ED D I IN N S SA AF FE EG GU UA AR RD DS S/ /N NO ON NP PR RO OL LI IF FE ER RA AT TI IO ON N The Next Generation Safeguards Initiative (NGSI) was launched by the National Nuclear Security Administration (NNSA) in FY 2008 to develop the policies, concepts, technologies, expertise, and infrastructure necessary to strengthen and sustain the international safeguards system as it evolves to meet new challenges over the next 25 years. NGSI's Human Capital Development subprogram 1 aims to revitalize and expand the international safeguards human capital base in the United States by attracting, educating, training, and retaining

456

Micro-Scratch Study of a Magnetron-Sputtered Zr-Based Metallic-Glass Film  

SciTech Connect (OSTI)

Using the micro-scratch technique, the tribological behavior of ZrCuAlNi metallic-glass coatings on 316L stainless steel was studied. With the application of ramping normal loads, the critical normal loads of about 110 mN were determined, at which the coefficient of friction increased sharply and the indenter penetration depth exceeded the film thickness. No clear evidence of coating debonding has been found, which, together with the observation of multiple shear bands, indicates good adhesion and ductility of the metallic-glass coating. When subjected to constant normal loads, the coefficient of friction increased rapidly once the critical normal load was passed. The scratch results and the scanning-electron microscopy observations indicated good adhesion between the coating and the substrate, which may be due to the good interfacial bonding and low coating residual stress.

Liu, F. X. [University of Tennessee, Knoxville (UTK); Yang, F. Q. [University of Kentucky; Gao, Yanfei [ORNL; Jiang, W. H. [University of Tennessee, Knoxville (UTK); Guan, Y F [University of Tennessee, Knoxville (UTK); Rack, P. D. [University of Tennessee, Knoxville (UTK); Sergic, O. [CSM Instruments Inc.; Liaw, Peter K [University of Tennessee, Knoxville (UTK)

2009-01-01T23:59:59.000Z

457

Gamow-Teller response in deformed even and odd neutron-rich Zr and Mo isotopes  

E-Print Network [OSTI]

Beta-decay properties of neutron-rich Zr and Mo isotopes are investigated within a microscopic theoretical approach based on the proton-neutron quasiparticle random-phase approximation. The underlying mean field is described self-consistently from deformed Skyrme Hartree-Fock calculations with pairing correlations. Residual separable particle-hole and particle-particle forces are also included in the formalism. The structural evolution in these isotopic chains including both even and odd isotopes is analyzed in terms of the equilibrium deformed shapes. Gamow-Teller strength distributions, beta-decay half-lives, and beta-delayed neutron-emission probabilities are studied, stressing their relevance to describe the path of the nucleosynthesis rapid neutron capture process.

P. Sarriguren; A. Algora; J. Pereira

2014-03-05T23:59:59.000Z

458

Corrosion behavior of TiZrNiCuBe metallic glass coatings synthesized by electrospark deposition  

Science Journals Connector (OSTI)

Abstract Electrospark deposition was applied to successfully deposit TiZrNiCuBe metallic glass coating on 304L stainless steel. The coating was fully amorphous with the thickness of ?380 ?m. The corrosion behavior was investigated in 1, 6 and 11.5 mol/L HNO3. The optimal corrosion resistance was achieved in 6 mol/L HNO3 for the coating. The corrosion mechanism was discussed based on the effect of the structural heterogeneity on the corrosion resistance. It was found that the heterogeneous surface structure deteriorated the corrosion resistance. We believe that the coating will find a wide range of applications for protecting working parks in corrosive environments.

Congbo Li; Dehua Chen; Weiwei Chen; Lu Wang; Dawei Luo

2014-01-01T23:59:59.000Z

459

In situ observation of oxygen gettering by titanium overlayer on HfO{sub 2}/SiO{sub 2}/Si using high-resolution Rutherford backscattering spectroscopy  

SciTech Connect (OSTI)

Oxygen gettering by Ti overlayer (2-8 nm) on a HfO{sub 2}(3 nm)/SiO{sub 2}(1.5 nm)/Si(001) structure was investigated using high-resolution Rutherford backscattering spectroscopy. After deposition of a thin Ti layer, the interfacial SiO{sub 2} layer is reduced by {approx}0.2 nm and the released oxygen is incorporated in Ti layer. Subsequent annealing at 330 deg. C in UHV causes further reduction by 0.1-0.8 nm depending on the Ti layer thickness. In addition to the reduction of the SiO{sub 2} layer, significant oxygen depletion in the HfO{sub 2} layer was observed for thicker Ti layers after annealing.

Nakajima, Kaoru; Fujiyoshi, Akira; Ming, Zhao; Suzuki, Motofumi; Kimura, Kenji [Department of Micro Engineering, Kyoto University, Yoshida-Honmachi, Sakyo, Kyoto 606-8501 (Japan)

2007-09-15T23:59:59.000Z

460

Intermixing between HfO{sub 2} and GeO{sub 2} films deposited on Ge(001) and Si(001): Role of the substrate  

SciTech Connect (OSTI)

Thermally driven atomic transport in HfO{sub 2}/GeO{sub 2}/substrate structures on Ge(001) and Si(001) was investigated in N{sub 2} ambient as function of annealing temperature and time. As-deposited stacks showed no detectable intermixing and no instabilities were observed on Si. On Ge, loss of O and Ge was detected in all annealed samples, presumably due to evolution of GeO from the GeO{sub 2}/Ge interface. In addition, hafnium germanate is formed at 600 deg. C. Our data indicate that at 500 deg. C and above HfO{sub 2}/GeO{sub 2} stacks are stable only if isolated from the Ge substrate.

Soares, G. V.; Krug, C. [Instituto de Fisica, UFRGS, Porto Alegre, Rio Grande do Sul 91509-900 (Brazil); Miotti, L.; Bastos, K. P.; Lucovsky, G. [Department of Physics, North Carolina State University, Raleigh, North Carolina 27695 (United States); Baumvol, I. J. R. [Instituto de Fisica, UFRGS, Porto Alegre, Rio Grande do Sul 91509-900 (Brazil); Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560 (Brazil); Radtke, C. [Instituto de Quimica, UFRGS, Porto Alegre, Rio Grande do Sul 91509-900 (Brazil)

2011-03-28T23:59:59.000Z

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461

High performance organic field-effect transistors with ultra-thin HfO{sub 2} gate insulator deposited directly onto the organic semiconductor  

SciTech Connect (OSTI)

We have produced stable organic field-effect transistors (OFETs) with an ultra-thin HfO{sub 2} gate insulator deposited directly on top of rubrene single crystals by atomic layer deposition (ALD). We find that ALD is a gentle deposition process to grow thin films without damaging rubrene single crystals, as results these devices have a negligibly small threshold voltage and are very stable against gate-bias-stress, and the mobility exceeds 1 cm{sup 2}/V s. Moreover, the devices show very little degradation even when kept in air for more than 2 months. These results demonstrate thin HfO{sub 2} layers deposited by ALD to be well suited as high capacitance gate dielectrics in OFETs operating at small gate voltage. In addition, the dielectric layer acts as an effective passivation layer to protect the organic semiconductor.

Ono, S., E-mail: shimpei@criepi.denken.or.jp [Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511 (Japan); Häusermann, R. [Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511 (Japan) [Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511 (Japan); Laboratory for Solid State Physics, ETH Zurich, Zurich 8093 (Switzerland); Chiba, D. [Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan) [Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan); PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 322-0012 (Japan); Department of Applied Physics, University of Tokyo, Tokyo 113-8656 (Japan); Shimamura, K.; Ono, T. [Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan)] [Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan); Batlogg, B. [Laboratory for Solid State Physics, ETH Zurich, Zurich 8093 (Switzerland)] [Laboratory for Solid State Physics, ETH Zurich, Zurich 8093 (Switzerland)

2014-01-06T23:59:59.000Z

462

Highly transparent low capacitance plasma enhanced atomic layer deposition Al{sub 2}O{sub 3}-HfO{sub 2} tunnel junction engineering  

SciTech Connect (OSTI)

The development of metallic single electron transistor (SET) depends on the downscaling and the electrical properties of its tunnel junctions. These tunnel junctions should insure high tunnel current levels, low thermionic current, and low capacitance. The authors use atomic layer deposition to fabricate Al{sub 2}O{sub 3} and HfO{sub 2} thin layers. Tunnel barrier engineering allows the achievement of low capacitance Al{sub 2}O{sub 3} and HfO{sub 2} tunnel junctions using optimized annealing and plasma exposure conditions. Different stacks were designed and fabricated to increase the transparency of the tunnel junction while minimizing thermionic current. This tunnel junction is meant to be integrated in SET to enhance its electrical properties (e.g., operating temperature, I{sub ON}/I{sub OFF} ratio)

El Hajjam, Khalil, E-mail: khalil.el-hajjam@insa-lyon.fr [INL, INSA, UMR CNRS 5270, 7 Avenue Jean Capelle, 69621 Villeurbanne Cedex, France and Institut Interdisciplinaire d'Innovation Technologique (3IT), Université de Sherbrooke, 3000 Boulevard Université, Sherbrooke, J1K OA5, Québec (Canada); Baboux, Nicolas; Calmon, Francis [INL, INSA, UMR CNRS 5270, 7 Avenue Jean Capelle, 69621 Villeurbanne Cedex (France); Souifi, Abdelkader [Laboratoire Nanotechnologies Nanosystèmes (LN2)-CNRS UMI-3463, Université de Sherbrooke, 3000 Boulevard Université, Sherbrooke, J1K OA5, Québec (Canada); Poncelet, Olivier; Francis, Laurent A. [ICTEAM, ELEN, UCL, Place du Levant 3, 1348 Louvain-la-Neuve (Belgium); Ecoffey, Serge; Drouin, Dominique [Laboratoire Nanotechnologies Nanosystèmes (LN2)-CNRS UMI-3463, Université de Sherbrooke, 3000 Boulevard Université, Sherbrooke, J1K OA5, Québec, Canada and Institut Interdisciplinaire d'Innovation Technologique (3IT), Université de Sherbrooke, 3000 Boulevard Université, Sherbrooke, J1K OA5, Québec (Canada)

2014-01-15T23:59:59.000Z

463

In Situ Synchrotron Based X-ray Fluorescence and Scattering Measurements During Atomic Layer Deposition: Initial Growth of HfO2 on Si and Ge Substrates  

SciTech Connect (OSTI)

The initial growth of HfO{sub 2} was studied by means of synchrotron based in situ x-ray fluorescence (XRF) and grazing incidence small angle x-ray scattering (GISAXS). HfO{sub 2} was deposited by atomic layer deposition (ALD) using tetrakis(ethylmethylamino)hafnium and H{sub 2}O on both oxidized and H-terminated Si and Ge surfaces. XRF quantifies the amount of deposited material during each ALD cycle and shows an inhibition period on H-terminated substrates. No inhibition period is observed on oxidized substrates. The evolution of film roughness was monitored using GISAXS. A correlation is found between the inhibition period and the onset of surface roughness.

K Devloo-Casier; J Dendooven; K Ludwig; G Lekens; J DHaen; C Detavernier

2011-12-31T23:59:59.000Z

464

In situ study of the role of substrate temperature during atomic layer deposition of HfO{sub 2} on InP  

SciTech Connect (OSTI)

The dependence of the “self cleaning” effect of the substrate oxides on substrate temperature during atomic layer deposition (ALD) of HfO{sub 2} on various chemically treated and native oxide InP (100) substrates is investigated using in situ X-ray photoelectron spectroscopy. The removal of In-oxide is found to be more efficient at higher ALD temperatures. The P oxidation states on native oxide and acid etched samples are seen to change, with the total P-oxide concentration remaining constant, after 10 cycles of ALD HfO{sub 2} at different temperatures. An (NH{sub 4}){sub 2} S treatment is seen to