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Note: This page contains sample records for the topic "rare earth materials" 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.


1

The Materials Preparation Center - Making Rare Earth Metals - Part 3  

SciTech Connect (OSTI)

Trevor Riedeman, manager of the MPC Rare Earth Materials Section, gives a presentation on the importance of rare earth metals and how they are made at Ames Laboratory. Part 3 of 4.

Riedemann, Trevor

2011-01-01T23:59:59.000Z

2

The Materials Preparation Center - Making Rare Earth Metals - Part 2  

SciTech Connect (OSTI)

Trevor Riedeman, manager of the MPC Rare Earth Materials Section, gives a presentation on the importance of rare earth metals and how they are made at Ames Laboratory. Part 2 of 4.

Riedemann, Trevor

2011-01-01T23:59:59.000Z

3

The Materials Preparation Center - Making Rare Earth Metals - Part 1  

SciTech Connect (OSTI)

Trevor Riedeman, manager of the MPC Rare Earth Materials Section, gives a presentation on the importance of rare earth metals and how they are made at Ames Laboratory. Part 1 of 4.

Riedemann, Trevor

2011-01-01T23:59:59.000Z

4

The Materials Preparation Center - Making Rare Earth Metals - Part 4  

SciTech Connect (OSTI)

Trevor Riedeman, manager of the MPC Rare Earth Materials Section, gives a presentation on the importance of rare earth metals and how they are made at Ames Laboratory. Part 4 of 4.

Riedemann, Trevor

2011-01-01T23:59:59.000Z

5

The Materials Preparation Center - Making Rare Earth Metals - Part 3  

ScienceCinema (OSTI)

Trevor Riedeman, manager of the MPC Rare Earth Materials Section, gives a presentation on the importance of rare earth metals and how they are made at Ames Laboratory. Part 3 of 4.

Riedemann, Trevor

2013-03-01T23:59:59.000Z

6

The Materials Preparation Center - Making Rare Earth Metals - Part 1  

ScienceCinema (OSTI)

Trevor Riedeman, manager of the MPC Rare Earth Materials Section, gives a presentation on the importance of rare earth metals and how they are made at Ames Laboratory. Part 1 of 4.

Riedemann, Trevor

2013-03-01T23:59:59.000Z

7

News about Rare Earths, New or Critical Materials, and Their...  

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

14, 2014 Could magnets in helmets reduce football concussions?, November 2014 The Rare-Earth Elements -- Vital to Modern Technologies and Lifestyles, November 2014 Energy Report:...

8

Alternative High-Performance Motors with Non-Rare Earth Materials...  

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

Alternative High-Performance Motors with Non-Rare Earth Materials 2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer...

9

Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials  

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

Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials for a Clean Energy Future Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials for a Clean Energy Future December 3, 2010 Session A: Setting the Scene - Critical Materials for a Clean Energy Future Diana Bauer, Office of Policy and International Affairs, U.S. Department of Energy, Highlights of the DOE Critical Materials Strategy Antje Wittenberg, Directorate General for Enterprise and Industry, The EU Raw Materials Initiative and the Report of the Ad-hoc Group (tbc) Tom Lograsso, Ames Laboratory (Iowa State University), Future Directions in Rare Earth Research: Critical Materials for 21st Century Industry Derk Bol, Materials Innovation Institute M2i (Netherlands) M2i, Material

10

POWDER METALLURGICAL PROCESSING OF MAGNETOSTRICTIVE MATERIALS BASED ON RARE EARTH-IRON INTERMETALLIC COMPOUNDS  

E-Print Network [OSTI]

R « any of several rare earth elements) was discovered. Toobserved for pure rare earth elements. This and the strong

Malekzadeh, Manoochehr

2011-01-01T23:59:59.000Z

11

Rare Earth Tungsten Bronzes  

Science Journals Connector (OSTI)

Rare Earth Tungsten Bronzes ... Trivalent Rare Earth Ion Conduction in the Rare Earth Tungstates with the Sc2(WO4)3-Type Structure ... Trivalent Rare Earth Ion Conduction in the Rare Earth Tungstates with the Sc2(WO4)3-Type Structure ...

Werner Ostertag

1966-05-01T23:59:59.000Z

12

Ames Lab 101: Rare Earths  

ScienceCinema (OSTI)

"Mr. Rare Earth," Ames Laboratory scientist Karl Gschneidner Jr., explains the importance of rare-earth materials in many of the technologies we use today -- ranging from computers to hybrid cars to wind turbines. Gschneidner is a world renowned rare-earths expert at the U.S. Department of Energy's Ames Laboratory.

Gschneidner, Karl

2012-08-29T23:59:59.000Z

13

Rare-Earth Research Meeting  

Science Journals Connector (OSTI)

Rare-Earth Research Meeting ... The 27th Rare Earth Research Conference will take place at the Village at Squaw Valley in Olympic Valley, Calif.—the site of the 1960 Winter Olympic Games—on June 22–26, 2014. ... Rare-earth element research spans several disciplines and brings together chemists, engineers, physicists, and materials scientists. ...

SOPHIE ROVNER

2013-12-23T23:59:59.000Z

14

Effect of microstructure, grain size, and rare earth doping on the electrorheological performance of nanosized particle materials  

E-Print Network [OSTI]

and grain sizes were prepared by doping TiO2 or ZrO2 with rare earth (RE) elements, and by changingEffect of microstructure, grain size, and rare earth doping on the electrorheological performance-Hua Zhang,c Shu-Mei Chen,d Rui-Li Huange and Song Gaoa a State Key Laboratory of Rare Earth Materials

Gao, Song

15

Silicon Shovels for Rare-Earth Solutions  

Office of Science (SC) Website

the uses for rare-earths, but the mined and processed totals are falling short. Green energy technology needs rare earth materials for wind turbines, rechargeable...

16

10 Questions for a Materials Scientist: Mr. Rare Earth -- Dr. Karl A.  

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

Materials Scientist: Mr. Rare Earth -- Dr. Karl Materials Scientist: Mr. Rare Earth -- Dr. Karl A. Gschneidner, Jr. 10 Questions for a Materials Scientist: Mr. Rare Earth -- Dr. Karl A. Gschneidner, Jr. April 3, 2013 - 12:59pm Addthis Dr. Karl Gschneidner is holding a neodymium-iron-boron magnet produced using a new, greener process. The process that Dr. Gschneidner helped develop doesn’t produce the environmentally unfriendly byproducts that result from traditional manufacturing methods. | Photo courtesy of Ames Laboratory. Dr. Karl Gschneidner is holding a neodymium-iron-boron magnet produced using a new, greener process. The process that Dr. Gschneidner helped develop doesn't produce the environmentally unfriendly byproducts that result from traditional manufacturing methods. | Photo courtesy of Ames

17

High-pressure studies of rare earth material could lead to lighter, cheaper  

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

22013_earth 22013_earth 12/20/2013 A Lawrence Livermore researcher prepares a sample at Oak Ridge National Laboratory's Spallation Neutrons and Pressure Diffractometer (SNAP). High-pressure studies of rare earth material could lead to lighter, cheaper magnets Anne M Stark, LLNL, (925) 422-9799, stark8@llnl.gov Sometimes you have to apply a little pressure to get magnetic materials to reveal their secrets. By placing a permanent magnet under high pressures, Lawrence Livermore researchers are exploring how atomic structure enhances magnetic strength and resistance to demagnetization. This fundamental research into magnetic behavior has important implications for engineering stronger, cheaper magnets. Permanent magnets based on rare earth elements are in high demand for

18

New model for the mixed-valence phenomenon in rare-earth materials  

Science Journals Connector (OSTI)

A model of a single rare-earth atom in a transition metal is derived, and terms describing screening of charge fluctuations in the resonant l=3 scattering channels by the l=2 channels are included. Using the Tomonaga approximation, in which charge fluctuations are represented by bosons, the screening channels are replaced by a boson field, and the model takes on a particularly simple form, the Anderson model of a magnetic impurity, now coupled to the boson field. The mean-field theory of this model suggests that, unlike in the original Anderson model, the impurity can be in a state of slowly fluctuating valence, which we identify with the mixed-valence phenomenon in certain rare-earth materials. These results suggest that the mixed-valence effect may be purely electronic in origin.

F. D. M. Haldane

1977-03-01T23:59:59.000Z

19

Lattice vibration in homogeneously-mixed-valent systems of rare-earth materials  

Science Journals Connector (OSTI)

We investigate the essential feature of interplay between lattice vibration and valence fluctuation in the homogeneously-mixed-valent systems of rare-earth materials rigorously within simple models, paying special attention to studying the collective nature of excitations in lattice vibration as well as in valence fluctuation. We compare our results with experiments and find that the general features of the experiments of Sm0.75Y0.25S are well understood within the present model if we assume the characteristic energy of the valence fluctuation to be comparable to the phonon energy.

S. Ichinose and Y. Kuroda

1982-02-15T23:59:59.000Z

20

Rare Earth Elements:  

Science Journals Connector (OSTI)

...Energy-efficient compact fluorescent lamps (CFLs) use phosphor...LEDs), and compact fluorescent lamps (CFLs) all utilize...conventional incandescent light bulbs with CFLs in numerous...rare earth industry and led to significant price...previous year. This led to significant price...

Gareth P. Hatch

Note: This page contains sample records for the topic "rare earth materials" 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

Rare-Earth-Free Nanostructure Magnets: Rare-Earth-Free Permanent Magnets for Electric Vehicle Motors and Wind Turbine Generators: Hexagonal Symmetry Based Materials Systems Mn-Bi and M-type Hexaferrite  

SciTech Connect (OSTI)

REACT Project: The University of Alabama is developing new iron- and manganese-based composite materials for use in the electric motors of EVs and renewable power generators that will demonstrate magnetic properties superior to today’s best rare-earth-based magnets. Rare earths are difficult and expensive to refine. EVs and renewable power generators typically use rare earths to make their electric motors smaller and more powerful. The University of Alabama has the potential to improve upon the performance of current state-of-the-art rare-earth-based magnets using low-cost and more abundant materials such as manganese and iron. The ultimate goal of this project is to demonstrate improved performance in a full-size prototype magnet at reduced cost.

None

2012-01-01T23:59:59.000Z

22

Ames Lab 101: Rare-Earth Recycling  

SciTech Connect (OSTI)

Recycling keeps paper, plastics, and even jeans out of landfills. Could recycling rare-earth magnets do the same? Perhaps, if the recycling process can be improved. Scientists at the U.S. Department of Energy's Ames Laboratory are working to more effectively remove the neodymium, a rare earth, from the mix of other materials in a magnet.

Ryan Ott

2012-09-05T23:59:59.000Z

23

Iron-Nickel-Based SuperMagnets: Multiscale Development of L10 Materials for Rare Earth-Free Permanent Magnets  

SciTech Connect (OSTI)

REACT Project: Northeastern University will develop bulk quantities of rare-earth-free permanent magnets with an iron-nickel crystal structure for use in the electric motors of renewable power generators and EVs. These materials could offer magnetic properties that are equivalent to today’s best commercial magnets, but with a significant cost reduction and diminished environmental impact. This iron-nickel crystal structure, which is only found naturally in meteorites and developed over billions of years in space, will be artificially synthesized by the Northeastern University team. Its material structure will be replicated with the assistance of alloying elements introduced to help it achieve superior magnetic properties. The ultimate goal of this project is to demonstrate bulk magnetic properties that can be fabricated at the industrial scale.

None

2012-01-01T23:59:59.000Z

24

Rare Earth Elements:  

Science Journals Connector (OSTI)

...were also extracted as by-products of uranium mining from conglomerates at Elliot Lake...toxic waste lakes, acrid air, and high cancer rates in the Bayan Obo area. The environmental...Major and trace element composition of the depleted MORB mantle (DMM). Earth and Planetary...

Anton R. Chakhmouradian; Frances Wall

25

Rapporteur's Report - workshop on rare earth elements  

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

Trans-Atlantic Workshop on Rare Earth Elements and Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials for a Clean Energy Future Hosted by the MIT Energy Initiative, cambridge, Massachusetts december 3, 2010 Introduction The objective of the workshop was to exchange views and information on the material security challenges of rare earths and other elements critical for clean energy generation and use. This includes the description of current research topics around the supply chain and end uses, and to identify opportunities for Trans-Atlantic research cooperation. The workshop consisted of a series of brief presentations by researchers in the US and Europe, followed by a discussion of possible areas of collaboration proposed by the co-chairs. A list of the presentations and the agenda for the day is appended with this document.

26

Microstructural investigations of rare-earth transition-metal-based magnetocaloric materials for near-room-temperature applications  

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

LOGO LOGO Spomenka Kobe, Paul McGuiness, Boris Saje JoĹľef Stefan Institute Rare-Earth Permanent Magnets in Europe KOLEKTOR *China's Complete Control of Global High-Tech Magnet Industry Rare-earth minerals are used in: rechargeable batteries (in camcorders), cell phones, PDAs, laptop computers and other portable devices.. wind turbines, drinking water filters, petrochemical catalysts, polishing powders, hydrogen storage, fluorescent lighting, flat panels, color televisions, glass, ceramics and automotive catalysts. fiberoptics, dental and surgical lasers, MRI systems, as medical contrast agents, in medical isotopes and in positron emission tomography scintillation detectors. magnetic refrigeration rechargeable batteries used in hybrid vehicles permanent magnets

27

DOE launches rare earth metals research hub  

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

ATL011113_hub ATL011113_hub 01/11/2013 DOE launches rare earth metals research hub Anne M Stark, LLNL, (925) 422-9799, stark8@llnl.gov Printer-friendly Europium, a rare earth element that has the same relative hardness of lead, is used to create fluorescent lightbulbs. With no proven substitutes, europium is considered critical to the clean energy economy. Photo courtesy of the Ames Laboratory. High Resolution Image The Department of Energy has launched a research hub that focuses on solutions to the domestic shortages of rare earth metals and other materials critical for U.S. energy security. Housed at Ames Laboratory in Iowa, Lawrence Livermore has been involved in establishing this Energy Innovation Hub since its conception more than two years ago. In 2010, on behalf of DOE, LLNL hosted the first U.S.-Japan

28

Enhancement of thermopower of TAGS-85 high-performance thermoelectric materials by doping with the rare earth Dy  

SciTech Connect (OSTI)

Enhancement of thermopower is achieved by doping the narrow-band semiconductor Ag{sub 6.52}Sb{sub 6.52}Ge{sub 36.96}Te{sub 50} (acronym TAGS-85), one of the best p-type thermoelectric materials, with 1 or 2% of the rare earth dysprosium (Dy). Evidence for the incorporation of Dy into the lattice is provided by X-ray diffraction and increased orientation-dependent local fields detected by {sup 125}Te NMR spectroscopy. Since Dy has a stable electronic configuration, the enhancement cannot be attributed to 4f-electron states formed near the Fermi level. It is likely that the enhancement is due to a small reduction in the carrier concentration, detected by {sup 125}Te NMR spectroscopy, but mostly due to energy filtering of the carriers by potential barriers formed in the lattice by Dy, which has large both atomic size and localized magnetic moment. The interplay between the thermopower, the electrical resistivity, and the thermal conductivity of TAGS-85 doped with Dy results in an enhancement of the power factor (PF) and the thermoelectric figure of merit (ZT) at 730 K, from PF = 28 ?W cm{sup ?1} K{sup ?2} and ZT ? 1.3 in TAGS-85 to PF = 35 ?W cm{sup ?1} K{sup ?2} and ZT ? 1.5 in TAGS-85 doped with 1 or 2% Dy for Ge. This makes TAGS-85 doped with Dy a promising material for thermoelectric power generation.

Levin, Evgenii; Budko, Serfuei; Schmidt-Rohr, Klaus

2012-04-10T23:59:59.000Z

29

Rare-Earth-Free Traction Motor: Rare Earth-Free Traction Motor for Electric Vehicle Applications  

SciTech Connect (OSTI)

REACT Project: Baldor will develop a new type of traction motor with the potential to efficiently power future generations of EVs. Unlike today’s large, bulky EV motors which use expensive, imported rare-earth-based magnets, Baldor’s motor could be light, compact, contain no rare earth materials, and have the potential to deliver more torque at a substantially lower cost. Key innovations in this project include the use of a unique motor design, incorporation of an improved cooling system, and the development of advanced materials manufacturing techniques. These innovations could significantly reduce the cost of an electric motor.

None

2012-01-01T23:59:59.000Z

30

Good Earths and Rare Earths | Department of Energy  

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

Good Earths and Rare Earths Good Earths and Rare Earths Good Earths and Rare Earths April 20, 2011 - 6:17pm Addthis Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science What does this mean for me? Rare earth elements -- dysprosium, neodymium, terbium, europium and yttrium -- are essential to a wide range of green energy technologies ranging from windmills to electric vehicles One of their primary uses is in permanent magnets, which amount to over a $4 billion global industry Ames Laboratory recently discovered a way to make these magnets cheaper and greener and signed a cooperative research and development agreement with Molycorp Inc. -- the Western hemisphere's only producer of rare-earth oxides. China holds about 36 percent of world's rare-earth reserves, (compared to 13 percent in the U.S.), but it currently produces 95 percent

31

DOE Announces RFI on Rare Earth Metals | Department of Energy  

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

RFI on Rare Earth Metals RFI on Rare Earth Metals DOE Announces RFI on Rare Earth Metals May 6, 2010 - 12:00am Addthis Washington, D.C. - The Department of Energy has released a Request for Information (RFI) soliciting information on rare earth metals and other materials used in the energy sector. The request is specifically focused on rare earth metals (e.g., lanthanum, cerium and neodymium) and several other metals including lithium and cobalt, but respondents are welcome to identify other materials of interest. These materials are important to the development and deployment of a variety of clean energy technologies, such as wind turbines, hybrid vehicles, solar panels and energy efficient light bulbs. In a March 17 speech, Assistant Secretary of Energy for Policy & International Affairs David Sandalow announced that DOE is developing its

32

DOE Announces RFI on Rare Earth Metals | Department of Energy  

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

RFI on Rare Earth Metals RFI on Rare Earth Metals DOE Announces RFI on Rare Earth Metals May 6, 2010 - 12:00am Addthis Washington, D.C. - The Department of Energy has released a Request for Information (RFI) soliciting information on rare earth metals and other materials used in the energy sector. The request is specifically focused on rare earth metals (e.g., lanthanum, cerium and neodymium) and several other metals including lithium and cobalt, but respondents are welcome to identify other materials of interest. These materials are important to the development and deployment of a variety of clean energy technologies, such as wind turbines, hybrid vehicles, solar panels and energy efficient light bulbs. In a March 17 speech, Assistant Secretary of Energy for Policy & International Affairs David Sandalow announced that DOE is developing its

33

Replacing the Rare Earth Intellectual Capital  

SciTech Connect (OSTI)

The rare earth crisis slowly evolved during a 10 to 15 year period beginning in the mid-1980s, when the Chinese began to export mixed rare earth concentrates. In the early 1990s, they started to move up the supply chain and began to export the individual rare earth oxides and metals. By the late 1990s the Chinese exported higher value products, such as magnets, phosphors, polishing compounds, catalysts; and in the 21st century they supplied finished products including electric motors, computers, batteries, liquid-crystal displays (LCDs), TVs and monitors, mobile phones, iPods and compact fluorescent lamp (CFL) light bulbs. As they moved to higher value products, the Chinese slowly drove the various industrial producers and commercial enterprises in the US, Europe and Japan out of business by manipulating the rare earth commodity prices. Because of this, the technically trained rare earth engineers and scientists who worked in areas from mining to separations, to processing to production, to manufacturing of semifinished and final products, were laid-off and moved to other fields or they retired. However, in the past year the Chinese have changed their philosophy of the 1970s and 1980s of forming a rare earth cartel to control the rare earth markets to one in which they will no longer supply the rest of the world (ROW) with their precious rare earths, but instead will use them internally to meet the growing demand as the Chinese standard of living increases. To this end, they have implemented and occasionally increased export restrictions and added an export tariff on many of the high demand rare earth elements. Now the ROW is quickly trying to start up rare earth mines, e.g. Molycorp Minerals in the US and Lynas Corp. in Australia, to cover this shortfall in the worldwide market, but it will take about five years for the supply to meet the demand, even as other mines in the ROW become productive. Unfortunately, today there is a serious lack of technically trained personnel to bring the entire rare earth industry, from mining to original equipment manufacturers (OEM), up to full speed in the next few years. Accompanying this decline in technical expertise, innovation and new products utilizing rare earth elements has slowed dramatically, and it may take a decade or more to recapture America's leading role in technological advancements of rare earth containing products. Before the disruption of the US rare earth industry, about 25,000 people were employed in all aspects of the industry from mining to OEM. Today, only about 1,500 people are employed in these fields. The ratio of non-technically trained persons to those with college degrees in the sciences or engineering varies from about 8 to 1 to about 4 to 1, depending on the particular area of the industry. Assuming an average of 6 to 1, the number of college degree scientists and engineers has decreased from about 4,000 to 250 employed today. In the magnetic industry the approximate numbers are: 6,000 total with 750 technically trained people in the 1980s to 500 totally employed today of which 75 have degrees. The paucity of scientists and engineers with experience and/or training in the various aspects of production and commercialization of the rare earths is a serious limitation to the ability of the US to satisfy its own needs for materials and technologies (1) to maintain our military strength and posture, (2) to assume leadership in critical energy technologies, and (3) to bring new consumer products to the marketplace. The lack of experts is of even greater national importance than the halting in the 1990s and the recent restart of the mining/benification/separation effort in the US; and thus governmental intervention and support for at least five to 10 years will be required to ameliorate this situation. To respond quickly, training programs should be established in conjunction with a national research center at an educational institution with a long tradition in multiple areas of rare earth and other critical elements research and technology. This center should

Gschneidner, Jr., Karl

2011-04-01T23:59:59.000Z

34

Rare Earth Metals and Alloys | Ames Laboratory  

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

Mpc » Rare Earth Metals and Alloys Mpc » Rare Earth Metals and Alloys Rare Earth Metals and Alloys Terbium (Tb) and Cerium (Ce) phosphors in your computer screen allow you to see GREEN. Europium (Eu) is the source of the RED light and BLUE emitted by our display. The Ames Laboratory has been actively involved in the preparation of very pure rare earth metals since the early 1940's when Dr. Frank H. Spedding and his group of pioneers developed the ion-exchange process, a technique that separates the "fraternal fifteen" plus yttrium and scandium. As a result of this and subsequent work, high-purity oxides are available from which high-purity rare earth metals can be prepared. In most cases, the rare earth oxides are first converted to their respective fluorides and are then reduced metallothermicaly on a kilogram

35

Improved method for preparing rare earth sesquichalcogenides  

DOE Patents [OSTI]

An improved method for the preparation of high purity rare earth sesquichalcogenides is described. The rare earth, as one or more pieces of the metal, is sealed under a vacuum with a stoichiometric amount of sulfur or selenium and a small amount of iodine into a quartz reaction vessel. The sealed vessel is then heated to above the vaporization temperature of the chalcogen and below the melting temperature of the rare earth metal and maintained until the product has been formed. The iodine is then vaporized off leaving a pure product. The rare earth sulfides and selenides thus formed are useful as semiconductors and as thermoelectric generators. 3 tables.

Takeshita, T.; Beaudry, B.J.; Gschneidner, K.A. Jr.

1982-04-14T23:59:59.000Z

36

Rare?Earth?Free Permanent Magnets for Electrical Vehicle Motors and Wind Turbine Generators: Hexagonal Symmetry Based Materials Systems Mn?Bi and M?type Hexaferrite  

SciTech Connect (OSTI)

The research we conducted focuses on the rare-earth (RE)-free permanent magnet by modeling, simulating, and synthesizing exchange coupled two-phase (hard/soft) RE-free core-shell nano-structured magnet. The RE-free magnets are made of magnetically hard core materials (high anisotropy materials including Mn-Bi-X and M-type hexaferrite) coated by soft shell materials (high magnetization materials including Fe-Co or Co). Therefore, our research helps understand the exchange coupling conditions of the core/shell magnets, interface exchange behavior between core and shell materials, formation mechanism of core/shell structures, stability conditions of core and shell materials, etc.

Hong, Yang-Ki [University of Alabama] [University of Alabama; Haskew, Timothy [University of Alabama] [University of Alabama; Myryasov, Oleg [University of Alabama] [University of Alabama; Jin, Sungho [University of California San Diego] [University of California San Diego; Berkowitz, Ami [University of California San Diego] [University of California San Diego

2014-06-05T23:59:59.000Z

37

Rare Earth Phosphate Glass and Glass-Ceramic Proton Conductors  

E-Print Network [OSTI]

300-500°C. Doping rare earth phosphate glasses with Ce, andRare Earth Phosphate Glass and Glass-Ceramic Protonconductivity of alkaline-earth doped rare earth phosphate

De Jonghe, Lutgard C.

2010-01-01T23:59:59.000Z

38

Thorium, uranium and rare earth elements content in lanthanide concentrate (LC) and water leach purification (WLP) residue of Lynas advanced materials plant (LAMP)  

SciTech Connect (OSTI)

Lynas Advanced Materials Plant (LAMP) has been licensed to produce the rare earths elements since early 2013 in Malaysia. LAMP processes lanthanide concentrate (LC) to extract rare earth elements and subsequently produce large volumes of water leach purification (WLP) residue containing naturally occurring radioactive material (NORM). This residue has been rising up the environmental issue because it was suspected to accumulate thorium with significant activity concentration and has been classified as radioactive residue. The aim of this study is to determine Th-232, U-238 and rare earth elements in lanthanide concentrate (LC) and water leach purification (WLP) residue collected from LAMP and to evaluate the potential radiological impacts of the WLP residue on the environment. Instrumental Neutron Activation Analysis and ?-spectrometry were used for determination of Th, U and rare earth elements concentrations. The results of this study found that the concentration of Th in LC was 1289.7 ± 129 ppm (5274.9 ± 527.6Bq/kg) whereas the Th and U concentrations in WLP were determined to be 1952.9±17.6 ppm (7987.4 ± 71.9 Bq/kg) and 17.2 ± 2.4 ppm respectively. The concentrations of Th and U in LC and WLP samples determined by ?- spectrometry were 1156 ppm (4728 ± 22 Bq/kg) and 18.8 ppm and 1763.2 ppm (7211.4 Bq/kg) and 29.97 ppm respectively. This study showed that thorium concentrations were higher in WLP compare to LC. This study also indicate that WLP residue has high radioactivity of {sup 232}Th compared to Malaysian soil natural background (63 - 110 Bq/kg) and come under preview of Act 304 and regulations. In LC, the Ce and Nd concentrations determined by INAA were 13.2 ± 0.6% and 4.7 ± 0.1% respectively whereas the concentrations of La, Ce, Nd and Sm in WLP were 0.36 ± 0.04%, 1.6%, 0.22% and 0.06% respectively. This result showed that some amount of rare earth had not been extracted and remained in the WLP and may be considered to be reextracted.

AL-Areqi, Wadeeah M., E-mail: walareqi@yahoo.com; Majid, Amran Ab., E-mail: walareqi@yahoo.com; Sarmani, Sukiman, E-mail: walareqi@yahoo.com [Nuclear Science Programme, School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi (Malaysia)

2014-02-12T23:59:59.000Z

39

Ames Lab 101: Rare-Earth Magnets  

ScienceCinema (OSTI)

Senior Scientist, Bill McCallum, briefly discusses rare-earth magnets and their uses and how Ames Lab is research new ways to save money and energy using magnets.

McCallum, Bill

2012-08-29T23:59:59.000Z

40

Earth-Abundant Materials  

Broader source: Energy.gov [DOE]

DOE funds research into Earth-abundant materials for thin-film solar applications in response to the issue of materials scarcity surrounding other photovoltaic (PV) technologies. Below are a list...

Note: This page contains sample records for the topic "rare earth materials" 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

Are Earths Rare? Perhaps Not  

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

where liquid water is permitted on the surface of a planet. The authors find that 22% of Sun-like stars harbor a planet between one and two times the size of Earth in the habitable...

42

DOE Science Showcase - Rare Earth Metal Research from DOE Databases |  

Office of Scientific and Technical Information (OSTI)

Rare Earth Metal Research from DOE Databases Rare Earth Metal Research from DOE Databases Information Bridge Energy Citations Database Highlighted documents of Rare Earth Metal research in DOE databases Information Bridge - Corrosion-resistant metal surfaces DOE R&D Project Summaries - Structural and magnetic studies on heavy rare earth metals at high pressures using designer diamonds Energy Citations Database - Intermultiplet transitions in rare-earth metals DOE Green Energy - LaNi.sub.5 is-based metal hydride electrode in Ni-MH rechargeable cells Science.gov - H.R.4866 - Rare Earths Supply-Chain Technology and Resources Transformation Act of 2010 WorldWideScience.org - China produces most of the world's rare earth metals DOepatents - Recycling of rare earth metals from rare earth-transition metal alloy scrap by liquid metal extraction

43

High efficiency rare-earth emitter for thermophotovoltaic applications  

SciTech Connect (OSTI)

In this work, we propose a rare-earth-based ceramic thermal emitter design that can boost thermophotovoltaic (TPV) efficiencies significantly without cold-side filters at a temperature of 1573?K (1300?°C). The proposed emitter enhances a naturally occurring rare earth transition using quality-factor matching, with a quarter-wave stack as a highly reflective back mirror, while suppressing parasitic losses via exponential chirping of a multilayer reflector transmitting only at short wavelengths. This allows the emissivity to approach the blackbody limit for wavelengths overlapping with the absorption peak of the rare-earth material, while effectively reducing the losses associated with undesirable long-wavelength emission. We obtain TPV efficiencies of 34% using this layered design, which only requires modest index contrast, making it particularly amenable to fabrication via a wide variety of techniques, including sputtering, spin-coating, and plasma-enhanced chemical vapor deposition.

Sakr, E. S.; Zhou, Z.; Bermel, P., E-mail: pbermel@purdue.edu [Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, 1205 W. State St., West Lafayette, Indiana 47907 (United States)

2014-09-15T23:59:59.000Z

44

Spomenka Kobe, Jozef Stefan Institut, Rare Earth Magnets in Europe...  

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

Spomenka Kobe, Jozef Stefan Institut, Rare Earth Magnets in Europe Spomenka Kobe, Jozef Stefan Institut, Rare Earth Magnets in Europe SessionB4Kobe-JosefStefanInstitut.pdf...

45

RARE EARTH ELEMENT SENSITIVITY FACTORS IN CALCIC PLAGIOCLASE (ANORTHITE)  

E-Print Network [OSTI]

RARE EARTH ELEMENT SENSITIVITY FACTORS IN CALCIC PLAGIOCLASE (ANORTHITE) C. Floss and B. Jolliff Mc Brookings Drive, St. Louis, MO 63130 1. Introduction The rare earth elements (REE) are sensitive indicators concentrations for each sample are listed in Table 1 and are shown in Fig. 1. Table 1. Rare Earth Element Data

46

Note: Portable rare-earth element analyzer using pyroelectric crystal  

SciTech Connect (OSTI)

We report a portable rare-earth element analyzer with a palm-top size chamber including the electron source of a pyroelectric crystal and the sample stage utilizing cathodoluminescence (CL) phenomenon. The portable rare-earth element analyzer utilizing CL phenomenon is the smallest reported so far. The portable rare-earth element analyzer detected the rare-earth elements Dy, Tb, Er, and Sm of ppm order in zircon, which were not detected by scanning electron microscopy-energy dispersive X-ray spectroscopy analysis. We also performed an elemental mapping of rare-earth elements by capturing a CL image using CCD camera.

Imashuku, Susumu, E-mail: imashuku.susumu.2m@kyoto-u.ac.jp; Fuyuno, Naoto; Hanasaki, Kohei; Kawai, Jun [Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501 (Japan)] [Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501 (Japan)

2013-12-15T23:59:59.000Z

47

Scintillation of rare earth doped fluoride nanoparticles  

SciTech Connect (OSTI)

The scintillation response of rare earth (RE) doped core/undoped (multi-)shell fluoride nanoparticles was investigated under x-ray and alpha particle irradiation. A significant enhancement of the scintillation response was observed with increasing shells due: (i) to the passivation of surface quenching defects together with the activation of the REs on the surface of the core nanoparticle after the growth of a shell, and (ii) to the increase of the volume of the nanoparticles. These results are expected to reflect a general aspect of the scintillation process in nanoparticles, and to impact radiation sensing technologies that make use of nanoparticles.

Jacobsohn, L. G.; McPherson, C. L.; Sprinkle, K. B.; Ballato, J. [Center for Optical Materials Science and Engineering Technologies (COMSET), and School of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634 (United States); Yukihara, E. G. [Physics Department, Oklahoma State University, Stillwater, Oklahoma 74078-3072 (United States); DeVol, T. A. [Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, South Carolina 29634-0905 (United States)

2011-09-12T23:59:59.000Z

48

DOE Announces Second RFI on Rare Earth Metals | Department of Energy  

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

Second RFI on Rare Earth Metals Second RFI on Rare Earth Metals DOE Announces Second RFI on Rare Earth Metals March 22, 2011 - 12:00am Addthis Washington, D.C. - The Department of Energy today released a Request for Information (RFI) soliciting information from the public on rare earth metals and other materials used in the energy sector. Responses to this RFI will inform an update to DOE's Critical Materials Strategy (pdf - 5.7mb ), released December 15, 2010, that assessed the use of rare earth metals and other materials important to the development and deployment of a variety of clean energy technologies, such as wind turbines, hybrid vehicles, solar panels and energy efficient light bulbs. The updated strategy, expected later this year, will include additional analysis of rapidly-changing market conditions. It will analyze the use

49

Watch a Rare Earth Elements Event Live This Morning | Department of Energy  

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

Watch a Rare Earth Elements Event Live This Morning Watch a Rare Earth Elements Event Live This Morning Watch a Rare Earth Elements Event Live This Morning December 15, 2010 - 9:20am Addthis Ginny Simmons Ginny Simmons Former Managing Editor for Energy.gov, Office of Public Affairs From 9:30am to noon ET today you can tune into a live discussion on "rare earth materials" that are critical to the production of clean energy technologies. Tune in here. The Department of Energy's Assistant Secretary for Policy and International Affairs David Sandalow will give the keynote, speaking to the role of rare earth metals and other materials in the clean energy economy. You can check back to the Energy Blog for more info later today. Ginny Simmons is a New Media Specialist and contractor to the Office of Public Affairs.

50

Watch a Rare Earth Elements Event Live This Morning | Department of Energy  

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

Watch a Rare Earth Elements Event Live This Morning Watch a Rare Earth Elements Event Live This Morning Watch a Rare Earth Elements Event Live This Morning December 15, 2010 - 9:20am Addthis Ginny Simmons Ginny Simmons Former Managing Editor for Energy.gov, Office of Public Affairs From 9:30am to noon ET today you can tune into a live discussion on "rare earth materials" that are critical to the production of clean energy technologies. Tune in here. The Department of Energy's Assistant Secretary for Policy and International Affairs David Sandalow will give the keynote, speaking to the role of rare earth metals and other materials in the clean energy economy. You can check back to the Energy Blog for more info later today. Ginny Simmons is a New Media Specialist and contractor to the Office of Public Affairs.

51

Microsoft Word - ARPA-E_RareEarth_Workshop_Overview_v6  

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

ARPA-E WORKSHOP ARPA-E WORKSHOP Rare Earth and Critical Materials December 6, 2010 in Arlington, VA Background ...................................................................................................................................................................................... 2 Breakout Sessions and Participant Preparation .............................................................................................................. 8 Agenda ................................................................................................................................................................................................ 9 Contact Information ................................................................................................................................................................... 10

52

Synthesis, Computations and Characterizations of Low Dimensional Rare-Earth Compounds  

E-Print Network [OSTI]

Reduced rare-earth (Ln, lanthanide elements) compounds with low-dimensional Ln-Ln-bonded structures are promising candidates for magnetic materials because Ln-Ln-bonded molecules and solids have delocalized 5d electrons that make strong magnetic...

Chen, Chun-Yu

2014-04-28T23:59:59.000Z

53

Diversity of accessory minerals in rare-metal-rare earth pegmatites  

Science Journals Connector (OSTI)

About 150 accessory minerals have been identified in the rare-metal-rare earth pegmatites, including 36 OH-, F- and H2 O-bearing silicates, 27 volatile-free silicates, 31 complex oxides, and 17 carbonates. Most a...

B. M. Shmakin

2008-12-01T23:59:59.000Z

54

Behavior of Rare Earth Elements in Geothermal Systems- A New  

Open Energy Info (EERE)

Behavior of Rare Earth Elements in Geothermal Systems- A New Behavior of Rare Earth Elements in Geothermal Systems- A New Exploration/Exploitation Tool? Jump to: navigation, search OpenEI Reference LibraryAdd to library Report: Behavior of Rare Earth Elements in Geothermal Systems- A New Exploration/Exploitation Tool? Abstract N/A Author Department of Geology and Geological Engineering niversity of Idaho Published Publisher Not Provided, 2001 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Behavior of Rare Earth Elements in Geothermal Systems- A New Exploration/Exploitation Tool? Citation Department of Geology and Geological Engineering niversity of Idaho. 2001. Behavior of Rare Earth Elements in Geothermal Systems- A New Exploration/Exploitation Tool?. (!) : (!) . Retrieved from

55

Novel rare earth boron-rich solids  

SciTech Connect (OSTI)

A new series of boron-rich solids ReB{sub 22}C{sub 2}N (Re: Y, Ho, Er, Tm, Lu) was synthesized by traditional solid-state reaction. The crystal structure of the representative compound YB{sub 22}C{sub 2}N was solved by direct method from powder X-ray diffraction (XRD) data and transmission electron microscope (TEM) analysis. The unit cell of the new structure is rhombohedral with space group R-3m (No. 166), lattice constant a = b = 5.623(0) {angstrom} and c = 44.785(3) {angstrom} with six formula units in one unit cell. The atoms of boron in the solids, like most of the boron-rich solids, exist with icosahedral and octahedral clusters, and the whole crystal shows a layered structure. The interconnected nine layers of icosahedron and three layers of octahedron in a unit cell build the whole framework of the new phase and rare earth metal atoms reside in voids of the octahedron layers. The neighboring icosahedral layers link through C-B-C chains besides the direct bonding of B-B. Both experimental and structural analysis indicated that the nitrogen atoms in the new phase can be replaced with carbon.

Zhang, Fuxiang; Leithe-Jasper, Andreas; Xu, Jun; Mori, Takao; Matsui, Yoshio, Tanaka, Takaho; Okada, Shigeru

2001-06-01T23:59:59.000Z

56

Critical Materials and Rare Futures: Ames Laboratory Signs a New Agreement  

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

Critical Materials and Rare Futures: Ames Laboratory Signs a New Critical Materials and Rare Futures: Ames Laboratory Signs a New Agreement on Rare-Earth Research Critical Materials and Rare Futures: Ames Laboratory Signs a New Agreement on Rare-Earth Research June 15, 2011 - 7:07pm Addthis The plasma torch in the Retech plasma furnace is one tool used in Materials Preparation Center to create ultra-high purity metal alloy samples, particularly rare-earth metals, located at the Ames Lab. | Photo Courtesy of the Ames Lab Flickr The plasma torch in the Retech plasma furnace is one tool used in Materials Preparation Center to create ultra-high purity metal alloy samples, particularly rare-earth metals, located at the Ames Lab. | Photo Courtesy of the Ames Lab Flickr Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science

57

Microsoft Word - Rare Earth Update for RFI 110523final  

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

J. Thijssen, LLC P: 206 229 6882 J. Thijssen, LLC P: 206 229 6882 4910 163 rd Ave NE Redmond, WA 98052 e: jant@jthijssen.com Solid Oxide Fuel Cells and Critical Materials: A Review of Implications J. Thijssen, LLC Report Number: R102 06 04D1 Date: May 10, 2011 Prepared for: National Energy Technology Laboratory, In Sub-Contract to Leonardo Technologies, Inc. Contract Number: DE-FE0004002 (Subcontract: S013-JTH-PPM4002 MOD 00) 2 Summary The US DOE has identified a number of materials that are both used by clean energy technologies and are at risk of supply disruptions in the short term. Several of these materials, especially the rare earth elements (REEs) yttrium, cerium, and lanthanum were identified by DOE as critical (USDOE 2010) and are crucial to the function and performance of solid oxide

58

A Forward Look into Rare Earth Supply and Demand: A Role for Sedimentary Phosphate Deposits?  

Science Journals Connector (OSTI)

Abstract Rare earth elements, key to many high-technology applications, are regularly making headlines, even in general public newspapers. Will the word run short of rare earth elements and of the many applications that rest on their use? In support to French and European Union policy making, as well as in support to industrial clients, BRGM is monitoring rare earth markets from the supply and the demand sides, as well as for technological shifts that drive them. Not every rare earth element is effectively rare and there are well over 400 ongoing rare earth exploration projects worldwide. Nevertheless, some rare earth elements such as dysprosium, europium and terbium are rare, in high and fast growing demand; as they either are indispensable to the production of Fe-B-Nd (Dy) permanent magnets, the highest performance magnetic material currently being available at industrial scale, or to the production of phosphors essential to the production of fluorescent compact, energy saving, light bulbs and video displays. At the current 10% compound annual growth rate of the demand for these elements, the question arises of their the future availability. Among the many rare-earth bearing minerals apatite is of particular interest as a potential source of rare earth elements, as it is a widespread mineral, forming huge deposits such as the sedimentary and magmatic phosphate deposits. An overview of the potential of sedimentary phosphate deposits as an important source for future rare earth production is presented and discussed. In addition to knowledge about the distribution and concentration of individual rare earth elements in sedimentary phosphate deposits, it is also necessary to understand the partitioning of the individual elements between phosphogypsum and phosphoric acid in the fertilizer production process, as well as available technologies to recover and separate individual rare earth elements from these materials. This could pave the way to the generation of extra added-value for phosphate producers, and to the broadening of the international production base of rare earth elements in high demand by the global economy.

Patrice Christmann

2014-01-01T23:59:59.000Z

59

U.S. Rare Earth Magnet Patents Table © 11-10-2014 page...  

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

Rare Earth Magnet Patents Table 11-10-2014 page 1 Disclaimer: This U.S. Rare Earth Magnet Patents Table contains a sample of the rare- earth-magnet patents issued by the U.S....

60

Resonant Inelastic X-ray Scattering of Rare-Earth and Copper Systems  

E-Print Network [OSTI]

Introduction The rare earth elements have unique andun?lled f shell of rare earth elements gives them special4d, 4f shells for rare-earth elements. This suggests that

Kvashnina, Kristina

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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

Behavior Of Rare Earth Element In Geothermal Systems, A New  

Open Energy Info (EERE)

Behavior Of Rare Earth Element In Geothermal Systems, A New Behavior Of Rare Earth Element In Geothermal Systems, A New Exploration-Exploitation Tool Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Behavior Of Rare Earth Element In Geothermal Systems, A New Exploration-Exploitation Tool Details Activities (32) Areas (17) Regions (0) Abstract: The goal of this four-year project was to provide a database by which to judge the utility of the rare earth elements (REE) in the exploration for and exploitation of geothermal fields in the United States. Geothermal fluids from hot springs and wells have been sampled from a number of locations, including: (1) the North Island of New Zealand (1 set of samples); (2) the Cascades of Oregon; (3) the Harney, Alvord Desert and Owyhee geothermal areas of Oregon; (4) the Dixie Valley and Beowawe fields

62

Timelines | Critical Materials Institute  

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

of interest to rare earths and critical materials, organized by those specific to rare earth elements, general chemistry and uses. Timelines of rare earth discovery: Discovery and...

63

Behaviour of zirconium, niobium, yttrium and the rare earth elements in the Thor Lake rare-metal  

E-Print Network [OSTI]

Behaviour of zirconium, niobium, yttrium and the rare earth elements in the Thor Lake rare and the heavy rare earth elements in the world. Much of the potentially economic mineralization was concentrated of Science Department of Earth and Planetary Sciences McGill University, Montreal, QC, Canada February 2010

64

Mixed Conduction in Rare-Earth Phosphates  

E-Print Network [OSTI]

their  metal  to  phosphorous  ratio  can  be  varied;  materials,   as   the   phosphorous   to   metal   ratio  tetrahedron.    As   the  phosphorous  content  of  the  

Ray, Hannah Leung

2012-01-01T23:59:59.000Z

65

Process to remove rare earth from IFR electrolyte  

DOE Patents [OSTI]

The invention is a process for the removal of rare earths from molten chloride electrolyte salts used in the reprocessing of integrated fast reactor fuel (IFR). The process can be used either continuously during normal operation of the electrorefiner or as a batch process. The process consists of first separating the actinide values from the salt before purification by removal of the rare earths. After replacement of the actinides removed in the first step, the now-purified salt electrolyte has the same uranium and plutonium concentration and ratio as when the salt was removed from the electrorefiner.

Ackerman, J.P.; Johnson, T.R.

1992-01-01T23:59:59.000Z

66

Rare earth-transition metal scrap treatment method  

DOE Patents [OSTI]

Rare earth-transition metal (e.g. iron) scrap (e.g. Nd-Fe-B scrap) is melted to reduce the levels of tramp oxygen and nitrogen impurities therein. The tramp impurities are reduced in the melt by virtue of the reaction of the tramp impurities and the rare earth to form dross on the melt. The purified melt is separated from the dross for reuse. The oxygen and nitrogen of the melt are reduced to levels acceptable for reuse of the treated alloy in the manufacture of end-use articles, such as permanent magnets. 3 figs.

Schmidt, F.A.; Peterson, D.T.; Wheelock, J.T.; Jones, L.L.; Lincoln, L.P.

1992-02-11T23:59:59.000Z

67

Process to remove rare earth from IFR electrolyte  

DOE Patents [OSTI]

The invention is a process for the removal of rare earths from molten chloride electrolyte salts used in the reprocessing of integrated fast reactor fuel (IFR). The process can be used either continuously during normal operation of the electrorefiner or as a batch process. The process consists of first separating the actinide values from the salt before purification by removal of the rare earths. After replacement of the actinides removed in the first step, the now-purified salt electrolyte has the same uranium and plutonium concentration and ratio as when the salt was removed from the electrorefiner. 1 fig.

Ackerman, J.P.; Johnson, T.R.

1994-08-09T23:59:59.000Z

68

Dynamic Effective-Field Scheme for Rare-Earth Systems  

Science Journals Connector (OSTI)

We demonstrate the importance of including the dynamical exchange-interaction term in the Hamiltonian of a rare-earth system. The probability distribution of the dynamic exchange field is derived in the molecular field approximation. The result is exemplified for the zero-field magnetization and crystal field spectroscopy of NdSb.

Albert Furrer and Heinz Heer

1973-11-26T23:59:59.000Z

69

Cathode-Luminescence of Rare Earths in Coal Ash  

Science Journals Connector (OSTI)

... Samples of a number of Indian coals (from Darjeeling, Assam, Raniganj, Jharia and Hyderabad) were incinerated in thin layers ... in an electric furnace at 400° C. The presence of rare earths in the ashes so obtained could not be detected by arc spectrographic analysis with a current of 10 ...

BIBHUTI MUKHERJEE

1949-03-12T23:59:59.000Z

70

Method of forming magnetostrictive rods from rare earth-iron alloys  

DOE Patents [OSTI]

Rods of magnetostrictive alloys of iron with rare earth elements are formed by flowing a body of rare earth-iron alloy in a crucible enclosed in a chamber maintained under an inert gas atmosphere, forcing such molten rare-earth-iron alloy into a hollow mold tube of refractory material positioned with its lower end portion within the molten body by means of a pressure differential between the chamber and mold tube and maintaining a portion of the molten alloy in the crucible extending to a level above the lower end of the mold tube so that solid particles of higher melting impurities present in the alloy collect at the surface of the molten body and remain within the crucible as the rod is formed in the mold tube. 5 figs.

McMasters, O.D.

1986-09-02T23:59:59.000Z

71

Influence of mechanoactivation on rare earths leaching from phosphogypsum  

Science Journals Connector (OSTI)

The influence of mechanoactivation on the overall solubility of CaSO4 · 2H2O and of phosphogypsum in water and in diluted acids (10% HCl, 7% H2SO4) as well as on the leaching of rare earths from phosphogypsum have been studied. The mechanoactivation is performed in a centrifugal ball mill in air and in suspension with the acids mentioned above. Part of the experimental results are qualitatively explained considering the partial dehydration of the CaSO4 · 2H2O during the activation in air as well as considering the crystal structure disrupted by mechanoactivation. A dissolved fraction, considerably enriched in rare earths (compared to the initial phosphogypsum) is obtained as a result of H2SO4 treatment of the samples activated in water solution.

D. Todorovsky; A. Terziev; M. Milanova

1997-01-01T23:59:59.000Z

72

Magnetic Symmetry of Rare-Earth Orthochromites and Orthoferrites  

Science Journals Connector (OSTI)

A new magnetic symmetry of the rare-earth orthochromites and orthoferrites (RMO3) below the second Néel temperature due to the reordering of the rare-earth spins is proposed. It is shown that the magnetic symmetry group is lowered to the subgroup of index two, thereby keeping the unit cell invariant. The proposed symmetry is shown to be consistent with the previously observed spin configuration of RMO3 such as GdCrO3, DyFeO3, and DyCrO3, and would also be consistent with those of other RMO3. Although symmetry arguments and the calculation of the free energy show that two spin configurations are stable, in GdCrO3, a future measurement of the magnetoelectric tensor would determine which configuration GdCrO3 has. It is further predicted that the magnetoelectric effect should be observed in any RMO3 below the second Néel temperature.

Tsuyoshi Yamaguchi and Kunirô Tsushima

1973-12-01T23:59:59.000Z

73

DOE Seeks Your Novel Ideas for Recovery of Rare Earth Elements...  

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

Seeks Your Novel Ideas for Recovery of Rare Earth Elements from Coal and Coal Byproducts DOE Seeks Your Novel Ideas for Recovery of Rare Earth Elements from Coal and Coal...

74

Crystal Fields and the Effective-Point-Charge Model in the Rare-Earth Pnictides  

Science Journals Connector (OSTI)

Neutron scattering and specific-heat studies of the crystal fields in the rare-earth monophosphides are reported. It is found that the fourth-order crystal-field parameters for the phosphides and for other rare-earth pnictides fall on a universal curve which is close to that predicted by an effective-point-charge model for the light rare earths but deviates markedly for the heavy rare earths.

R. J. Birgeneau; E. Bucher; J. P. Maita; L. Passell; K. C. Turberfield

1973-12-15T23:59:59.000Z

75

Rare earth elements activate endocytosis in plant cells Lihong Wanga,b,1  

E-Print Network [OSTI]

Rare earth elements activate endocytosis in plant cells Lihong Wanga,b,1 , Jigang Lic,d,1 , Qing (sent for review May 15, 2014) It has long been observed that rare earth elements (REEs) regulate, such as rare earth elements (REEs), have been observed for a long time to be beneficial to plant growth (1, 2

Deng, Xing-Wang

76

VISIBLE AND INFRARED RARE-EARTH ACTIVATED ELECTROLUMINESCENCE FROM ERBIUM DOPED GaN  

E-Print Network [OSTI]

. At the same time novel work is being conducted using rare earth elements as sources of light emission. Results. III-V semiconductors doped with rare-earth elements have also been used10VISIBLE AND INFRARED RARE-EARTH ACTIVATED ELECTROLUMINESCENCE FROM ERBIUM DOPED GaN M. Garter*, R

Steckl, Andrew J.

77

Rare earth elements in the sediments of Lake Baikal Lawrence M. Och a  

E-Print Network [OSTI]

Rare earth elements in the sediments of Lake Baikal Lawrence M. Och a , Beat MĂĽller a, , Adrian Available online 3 April 2014 Editor: Carla M. Koretsky Keywords: Rare earth elements Cerium anomaly Lake to complex and cryptic redox cycles. The mobility of rare earth elements (REEs) is influenced

Wehrli, Bernhard

78

Speciation of adsorbed yttrium and rare earth elements on oxide surfaces  

E-Print Network [OSTI]

Speciation of adsorbed yttrium and rare earth elements on oxide surfaces Wojciech Piasecki, Dimitri 10 June 2008 Abstract The distribution of yttrium and the rare earth elements (YREE) between natural investigate the applicability of the X-ray results to rare earth elements and to several oxides in addition

Sverjensky, Dimitri A.

79

Growth and characterization of rare-earth monosulfides for cold cathode applications  

E-Print Network [OSTI]

of chalco- genides of the rare-earth elements.4,5 The possibility was analyzed theoretically basedGrowth and characterization of rare-earth monosulfides for cold cathode applications Y. Modukuru, J phonons at 261 284 and 100 92 cm 1 with LaS NdS , respectively. These rare-earth monosulfides offer

Boolchand, Punit

80

Source and mobility of Rare Earth Elements in a sedimentary aquifer system: Aquitaine basin (Southern France)  

E-Print Network [OSTI]

Source and mobility of Rare Earth Elements in a sedimentary aquifer system: Aquitaine basin Geological Survey Service, Bordeaux, France, e.malcuit@brgm.fr The study of rare earth elements (REEs such as rivers and lakes and groundwaters. Rare earth elements) are of great interest because of their unique

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "rare earth materials" 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

Use of rare earth elements as external markers for mean retention time measurements in ruminants  

E-Print Network [OSTI]

Review Use of rare earth elements as external markers for mean retention time measurements -- The present review deals with the utilisation of rare earth (RE) elements as particulate markers for ruminant earth / retention time / feedstuff / methodology / ruminant Résumé -- Utilisation des terres rares comme

Paris-Sud XI, Université de

82

Hydrothermal transport and deposition of the rare earth elements by fluorine-bearing aqueous liquids  

E-Print Network [OSTI]

ARTICLE Hydrothermal transport and deposition of the rare earth elements by fluorine environmental concerns, have created a great demand for the rare earth elements (REE), and focused considerable Hydrothermal concentration of the rare earth elements (REE) to economic and potentially economic levels has

83

Non-Rare Earth magnetic materials  

Broader source: Energy.gov [DOE]

2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation

84

Iron Isotope and Rare Earth Element Patterns of the Neoproterozoic Fulu Formation, South China: Implications for Late Proterozoic Ocean Chemistry  

E-Print Network [OSTI]

13 3.5. Rare Earth Element Analysis…………………………………………. ……15 4.21 b. 5.2. Rare Earth Element Patterns……………………………………………24 6.Piper, D. Z. (1974). Rare earth elements in the sedimentary

Goldbaum, Elizabeth

2014-01-01T23:59:59.000Z

85

Crystal Fields in Dilute Rare-Earth Metals Obtained from Magnetization Measurements on Dilute Rare-Earth Alloys  

Science Journals Connector (OSTI)

Crystal field parameters of Tb, Dy, and Er in Sc, Y, and Lu are summarized. These parameters are obtained from magnetization measurements on dilute single crystals, and successfully checked by a number of different methods. The crystal field parameters vary unpredictably with the rare-earth solute. B40, B60, and B66 are similar in Y and Lu. Crystal field parameters for the pure metals Tb, Dy, and Er are estimated from the crystal fields in Y and Lu.

P. Touborg and J. Hřg

1974-09-23T23:59:59.000Z

86

Microsoft Word - US-EU WORKSHOP on RARE EARTHS Program 20101206  

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

Trans-Atlantic Workshop Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials for a Clean Energy Future Hosted by the MIT Energy Initiative Massachusetts Institute of Technology 400 Main Street, Building E19-307, Cambridge, Massachusetts December 3, 2010 Workshop Background Rare earth elements and other critical raw materials are essential to our industrial production, particularly for clean energy options like wind turbines, solar cells, electric vehicles, and energy- efficient lighting. Wind turbines are the most rapidly growing source of electricity generation in both Europe and the United States. Solar photovoltaic cells are steadily declining in cost, and their widespread, cost-effective use on power grids is anticipated within the coming decade.

87

(Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2007. All  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2007. All yttrium Number Normal Trade Relations 12-31-07 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth-bearing materials and compounds containing by weight >19% to rare-earth

88

(Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2010. All  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2010. All yttrium Normal Trade Relations 12-31-10 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth-bearing materials and compounds containing by weight >19% to rare-earth compounds

89

Theory of Rayleigh waves on paramagnetic rare-earth systems  

Science Journals Connector (OSTI)

We present calculations of the velocity changes of Rayleigh waves in cubic, paramagnetic rare-earth systems due to magnetoelastic interactions. These interactions describe the coupling of the strain and rotational part of the deformation tensor to the incomplete 4f shell. They can be influenced by applying a magnetic field. An equation is obtained which generalizes that of Stoneley for cubic systems without magnetoelastic interactions. Special attention is paid to effects resulting from the rotational interactions. The theory is applied to CeAl2 for which experiments are available.

Robert Camley and Peter Fulde

1981-03-15T23:59:59.000Z

90

K Series X-Ray Wavelengths in Rare Earth Elements  

Science Journals Connector (OSTI)

The K-series x-rays in ten rare earth elements have been studied with a two-meter-radius bent-quartz-crystal spectrograph. The 3.7-Mev proton beam of the A-48 accelerator (UCRL, Livermore) was used to produce the atomic excitations. The wavelengths obtained for the K?1, K?2, K?3, and K?1 lines are compared with previous wavelength measurements. Two weaker transitions, K?5 and KOIIOIII, were also observed and the energies are compared with energies obtained from tables of known atomic energy levels.

E. L. Chupp, J. W. M. Du Mond, F. J. Gordon, R. C. Jopson, and Hans Mark

1958-11-15T23:59:59.000Z

91

Anisotropic magnetic properties of light rare-earth diantimonides  

SciTech Connect (OSTI)

Results are presented of anisotropic temperature and field-dependent magnetization M(H,T) and resistivity {rho}(H,T) measurements on high quality single crystals of the light rare-earth diantimonides RSb{sub 2}, R=La-Nd, Sm. All of these, excepting LaSb{sub 2}, magnetically order at low temperatures, and for CeSb{sub 2} and NdSb{sub 2} several magnetically ordered phases were observed in low-field magnetization and zero-field resistivity measurements. For R=Ce-Sm strong anisotropies, associated with crystalline electric field (CEF) splitting of the R{sup 3+} ion, were found in M(T) measurements both below and above magnetic ordering temperatures. Furthermore, for R=Ce-Nd metamagnetic transitions were observed in M(H) and {rho}(H) for H{parallel}(ab) in the magnetically ordered state. In addition, above 15 kG de Haas{endash}van Alphen oscillations are observed for SmSb{sub 2} and Shubnikov{endash}de Haas quantum oscillations are observed above {approximately}120kG for NdSb{sub 2} and SmSb{sub 2}. The zero-field in-plane resistivity {rho}{sub ab} of all of the compounds is metallic (d{rho}/dT{gt}0), with residual resistance ratios ranging from 40 to 750. The c-axis resistivity is also metallic, but appears to be considerably larger than the in-plane value, consistent with the diantimonides being quasi-two-dimensional materials. The magnetoresistance of all members of the series is large, approximately linear in H at moderate fields, and is also dependent on the relative orientation of the applied magnetic fields to the crystallographic axes. The extreme case of SmSb{sub 2} has [{rho}(55kG){minus}{rho}(0)]/{rho}(0){gt}50000{percent} at T=2K and H{parallel}c. {copyright} {ital 1998} {ital The American Physical Society}

Budko, S.L.; Canfield, P.C. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)] [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States); Mielke, C.H.; Lacerda, A.H. [National High Magnetic Field Laboratory, Los Alamos Facility, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [National High Magnetic Field Laboratory, Los Alamos Facility, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

1998-06-01T23:59:59.000Z

92

As China's Rare Earth R&D Becomes Ever More Rarefied, Others Tremble  

Science Journals Connector (OSTI)

...production and slap export tariffs on some rare...paper last month, China's Ministry of Industry...idea of prohibiting export of three scarcer rare earths...company in London. China has a “natural monopoly...complex hydrocarbons in petroleum refining. Military...which forced China to import processed rare earths...

Richard Stone

2009-09-11T23:59:59.000Z

93

The impact of vegetation on fractionation of rare earth elements (REE) during waterrock interaction  

E-Print Network [OSTI]

The impact of vegetation on fractionation of rare earth elements (REE) during water The fractionation of the rare earth elements (REE) in river water, as well as the immobilization of REE in the river earth elements (REE) principally originate from apatite dissolution during weathering. However, stream

Mailhes, Corinne

94

Iron-Nitride Alloy Magnets: Transformation Enabled Nitride Magnets Absent Rare Earths (TEN Mare)  

SciTech Connect (OSTI)

REACT Project: Case Western is developing a highly magnetic iron-nitride alloy to use in the magnets that power electric motors found in EVs and renewable power generators. This would reduce the overall price of the motor by eliminating the expensive imported rare earth minerals typically found in today’s best commercial magnets. The iron-nitride powder is sourced from abundant and inexpensive materials found in the U.S. The ultimate goal of this project is to demonstrate this new magnet system, which contains no rare earths, in a prototype electric motor. This could significantly reduce the amount of greenhouse gases emitted in the U.S. each year by encouraging the use of clean alternatives to oil and coal.

None

2012-01-01T23:59:59.000Z

95

X-ray resonant exchange scattering of rare-earth nickel borocarbides  

SciTech Connect (OSTI)

The purpose of this thesis is to investigate the systematics of the microscopic magnetic order within a series of isostructural compounds and, at the same, to develop the relatively young experimental method of x-ray resonant exchange scattering (XRES). In this thesis, the author presents XRES studies of several rare-earth nickel borocarbides, RNi{sub 2}B{sub 2}C. He shows that XRES, similar to the neutron techniques, allows the determination of the orientation of the magnetic moment by measuring the Q-dependence of the scattered intensity of magnetic Bragg reflections. As samples in this study, he chose the recently discovered family of rare-earth nickel borocarbides, RNi{sub 2}B{sub 2}C, which display a wide variety of magnetic structures. Furthermore, in several of these materials, long range magnetic order coexists with superconductivity over some temperature range.

Detlefs, C.

1997-10-08T23:59:59.000Z

96

Rare-Earth Surface Alloying: A New Phase for GdAu2 M. J. Verstraete,1,2  

E-Print Network [OSTI]

refrigeration, are made pos- sible by an unusual group of elements: the rare earths (REs). The rare earthsRare-Earth Surface Alloying: A New Phase for GdAu2 M. Corso,1 M. J. Verstraete,1,2 F. Schiller,1 M. Gadolinium is a borderline rare earth, which is naturally ferromagnetic but can easily switch to different

97

Grant Helps Make U.S. Rare Earth Magnets More Common | Department of Energy  

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

Grant Helps Make U.S. Rare Earth Magnets More Common Grant Helps Make U.S. Rare Earth Magnets More Common Grant Helps Make U.S. Rare Earth Magnets More Common August 6, 2010 - 12:12pm Addthis With sintered rare earth magnets a $4 billion worldwide market, the U.S. could be a bigger producer of these magnets - which are not actually rare - and are used in hybrid vehicle motors and wind turbine generators. | Illustration Courtesy of of Electron Energy Corporation | With sintered rare earth magnets a $4 billion worldwide market, the U.S. could be a bigger producer of these magnets - which are not actually rare - and are used in hybrid vehicle motors and wind turbine generators. | Illustration Courtesy of of Electron Energy Corporation | Kevin Craft Electron Energy Corporation is one of a kind. According to Peter Dent, vice president of business development for the

98

Grant Helps Make U.S. Rare Earth Magnets More Common | Department of Energy  

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

Grant Helps Make U.S. Rare Earth Magnets More Common Grant Helps Make U.S. Rare Earth Magnets More Common Grant Helps Make U.S. Rare Earth Magnets More Common August 6, 2010 - 12:12pm Addthis With sintered rare earth magnets a $4 billion worldwide market, the U.S. could be a bigger producer of these magnets - which are not actually rare - and are used in hybrid vehicle motors and wind turbine generators. | Illustration Courtesy of of Electron Energy Corporation | With sintered rare earth magnets a $4 billion worldwide market, the U.S. could be a bigger producer of these magnets - which are not actually rare - and are used in hybrid vehicle motors and wind turbine generators. | Illustration Courtesy of of Electron Energy Corporation | Kevin Craft Electron Energy Corporation is one of a kind. According to Peter Dent, vice president of business development for the

99

Rare earth focused ion beam implantation utilizing Er and Pr liquid alloy ion sources  

E-Print Network [OSTI]

Pr,10,11 Eu,12 Dy,13 Er,13­15 and Tm16 doped GaN. Rare earth elements were added during growthRare earth focused ion beam implantation utilizing Er and Pr liquid alloy ion sources L. C. Chao, B write implantation. © 1999 American Vacuum Society. S0734-211X 99 08306-7 I. INTRODUCTION Rare earth

Steckl, Andrew J.

100

Microsoft Word - rare earth speech 3-18 6am  

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

REMARKS PREPARED FOR DELIVERY REMARKS PREPARED FOR DELIVERY TECHNOLOGY AND RARE EARTH METALS CONFERENCE 2010 KEYNOTE ADDRESS DAVID SANDALOW ASSISTANT SECRETARY FOR POLICY & INTERNATIONAL AFFAIRS U.S. DEPARTMENT OF ENERGY WASHINGTON, D.C. MARCH 17, 2010 [Acknowledgements.] 1. INTRODUCTION Thank you for the invitation to speak at this important conference. At energy conferences today, no topic is hotter than shale gas. The story is striking: recoverable reserves of shale gas have increased six-fold in the past few years, thanks to new drilling technologies. This increase has been transformational, with U.S. natural gas imports now predicted to drop steadily in the next decade and beyond, whereas just a few years ago imports were projected to climb for the foreseeable future. Large shale gas reserves are believed to exist

Note: This page contains sample records for the topic "rare earth materials" 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

Shell model Monte Carlo investigation of rare earth nuclei  

Science Journals Connector (OSTI)

We utilize the shell model Monte Carlo method to study the structure of rare earth nuclei. This work demonstrates the first systematic full oscillator shell with intruder calculations in such heavy nuclei. Exact solutions of a pairing plus quadrupole Hamiltonian are compared with the static path approximation in several dysprosium isotopes from A=152 to 162, including the odd mass A=153. Some comparisons are also made with Hartree-Fock-Bogoliubov results from Baranger and Kumar. Basic properties of these nuclei at various temperatures and spin are explored. These include energy, deformation, moments of inertia, pairing channel strengths, band crossing, and evolution of shell model occupation numbers. Exact level densities are also calculated and, in the case of 162Dy, compared with experimental data.

J. A. White; S. E. Koonin; D. J. Dean

2000-02-14T23:59:59.000Z

102

Fabrication and evaluation of rare-earth-bearing fuel slugs for sodium-cooled fast reactors  

Science Journals Connector (OSTI)

Separation of rare-earth (RE) elements from minor actinides is difficult in pyroprocessing, especially for light REs (e.g....

Jong Hwan Kim; Hoon Song; Ki Hwan Kim…

2014-10-01T23:59:59.000Z

103

Classical spin model of the relaxation dynamics of rare-earth doped permalloy  

Science Journals Connector (OSTI)

In this paper, the ultrafast dynamic behavior of rare-earth doped permalloy is investigated using an atomistic spin model with Langevin dynamics. In line with experimental work, the effective Gilbert damping is calculated from transverse relaxation simulations, which shows that rare-earth doping causes an increase in the damping. Analytic theory suggests that this increase in damping would lead to a decrease in the demagnetization time. However, longitudinal relaxation calculations show an increase with doping concentration instead. The simulations are in a good agreement with previous experimental work of Radu et al. [Radu et al., Phys. Rev. Lett. 102, 117201 (2009)]. The longitudinal relaxation time of the magnetization is shown to be driven by the interaction between the transition metal and the laser-excited conduction electrons, whereas the effective damping is predominantly determined by the slower interaction between the rare-earth elements and the phonon heat bath. We conclude that for complex materials, it is evidently important not to expect a single damping parameter but to consider the energy transfer channel relevant to the technique and time scale of the measurement.

M. O. A. Ellis; T. A. Ostler; R. W. Chantrell

2012-11-19T23:59:59.000Z

104

Efficient, High-Torque Electric Vehicle Motor: Advanced Electric Vehicle Motors with Low or No Rare Earth Content  

SciTech Connect (OSTI)

REACT Project: QM Power will develop a new type of electric motor with the potential to efficiently power future generations of EVs without the use of rare-earth-based magnets. Many of today’s EV motors use rare earth magnets to efficiently provide torque to the wheels. QM Power’s motors would contain magnets that use no rare earth minerals, are light and compact, and can deliver more power with greater efficiency and at reduced cost. Key innovations in this project include a new motor design with iron-based magnetic materials, a new motor control technique, and advanced manufacturing techniques that substantially reduce the cost of the motor. The ultimate goal of this project is to create a cost-effective EV motor that offers the rough peak equivalent of 270 horsepower.

None

2012-01-01T23:59:59.000Z

105

Solvent extraction of rare-earth metals by carboxylic acids  

SciTech Connect (OSTI)

The solvent extraction of the trivalent lanthanides and yttrium from nitrate media by solutions of carboxylic acids in xylene has been studied. Commercially available carboxylic acids such as Versatic 10 and naphthenic acids were used, as well as model compounds of known structure, such as 2-ethylhexanoic and 3-cyclohexylpropanoic acids. In a few cases, extraction of the metals from sulphate and chloride solutions was also investigated. The dependence of the extraction properties of the carboxylic acids on the atomic number of the lanthanide shows a definite relationship to the steric bulk of the carboxylic acid molecule quantified by means of the steric parameter, E{sub s}{prime} of the substituent alkyl group. The stoichiometries of the extracted complexes for representative light (La), middle (Gd) and heavy (Lu) rare-earth metals were investigated by the slope-analysis technique for a sterically hindered acid (Versatic 10 acid; -E{prime}{sub s} = 3.83) and an acid with low steric hindrance (3-cyclohexylpropanoic acid; -E{prime}{sub s} = 0.28). 14 refs., 13 figs., 3 tabs.

Preez, A.C. du; Preston, J.S. [Mintek, Randburg (South Africa)

1992-04-01T23:59:59.000Z

106

Laser Spectroscopy of Short Lived Rare Earth Isotopes  

Science Journals Connector (OSTI)

The ISAC facility at TRIUMF is able to produce intense beams of mass?separated radioactive isotopes of the alkali and the rare earth elements with unprecedented intensities. This will allow our laser spectroscopy collaboration to extend the studies of exotic nuclei for these elements further away from the valley of stability into regions so far inaccessible at other facilities thus allowing a more stringent test of the descriptive and predictive power of global nuclear models. Our effort which involves groups and researchers from the U.S. (TAMU) Japan (JAERI) and Canada (TRIUMF McGill and Calgary Universities) is based on collinear laser spectroscopy in a fast beam. In this method atoms or ions are excited by laser light in collinear geometry. In this way measurements of the optical isotope shift yield the nuclear charge radii and measurements of the hyperfine structure the nuclear moments. The excitation can be done by cw?lasers or alternatively by pulsed lasers without a loss in sensitivity if bunched radioactive ion beams are available. In its basic version the resonances of the spectral lines are observed optically at right angles. However the sensitivity will be increased through modifications using particle or nuclear radiation detection. The progress and the plans of our collaboration will be described.

H. A. Schuessler; F. Buchinger; H. Iimura

2003-01-01T23:59:59.000Z

107

Structural transition in rare earth doped zirconium oxide: A positron annihilation study  

SciTech Connect (OSTI)

Graphical abstract: New microstructural analysis and phase transition of rare earth doped mixed oxide compounds such as: Sm{sub 2?x}Dy{sub x}Zr{sub 2}O{sub 7} (where x = 0.0 ? x ? 2.0) that are potentially useful as solid oxide fuels, ionic conductors, optoelectronic materials and most importantly as radiation resistant host for high level rad-waste disposal, structural transition in the system is reported through positron annihilation spectroscopy as there is an indication in the X-ray diffraction analysis. Highlights: ? Zirconium oxide material doped with rare earth ions. ? The method of positron annihilation spectroscopy suggests a phase transition in the system. ? The crystal structure transformation from pure pyrochlore to defect fluorite type of structure is shown by X-ray diffraction results. -- Abstract: A series of compounds with the general composition Sm{sub 2?x}Dy{sub x}Zr{sub 2}O{sub 7} (where 0 ? x ? 2.0) were synthesized by chemical route and characterized by powder X-ray diffraction (XRD) analysis. The rare earth ion namely Sm{sup +3} in the compound was gradually replaced with another smaller and heavier ion, Dy{sup +3} of the 4f series, there by resulting in order–disorder structural transition, which has been studied by positron annihilation lifetime and Doppler broadening spectroscopy. This study reveals the subtle electronic micro environmental changes in the pyrochlore lattice (prevalent due to the oxygen vacancy in anti-site defect structure of the compound) toward its transformation to defect fluorite structure as found in Dy{sub 2}Zr{sub 2}O{sub 7}. A comparison of the changes perceived with PAS as compared to XRD analysis is critically assayed.

Chakraborty, Keka [Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)] [Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India); Bisoi, Abhijit [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India)] [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India); Ganguly, Bichitra Nandi, E-mail: bichitra.ganguly@saha.ac.in [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India); Grover, Vinita; Sayed, Farheen Nasir; Tyagi, A.K. [Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)] [Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)

2012-11-15T23:59:59.000Z

108

High-temperature desulfurization of gasifier effluents with rare earth and rare earth/transition metal oxides  

SciTech Connect (OSTI)

We have improved the application of mixed rare-earth oxides (REOs) as hot gas desulfurization adsorbents by impregnating them on stable high surface area supports and by the inclusion of certain transition metal oxides. We report comparative desulfurization experiments at high temperature (900 K) using a synthetic biomass gasifier effluent containing 0.1 vol % H{sub 2}S, along with H{sub 2}, CO{sub 2}, and water. More complex REO sorbents outperform the simpler CeO{sub 2}/La{sub 2}O{sub 3} mixtures, in some cases significantly. Supporting REOs on Al{sub 2}O{sub 3} (?20 wt % REO) or ZrO{sub 2} actually increased the sulfur capacities found after several cycles on a total weight basis. Another major increase in sulfur capacity took place when MnO{sub x} or FeO{sub x} is incorporated. Apparently most of the Mn or Fe is dispersed on or near the surface of the mixed REOs because the capacities with REOs greatly exceeded those of Al{sub 2}O{sub 3}-supported MnO{sub x} or FeO{sub x} alone at these conditions. In contrast, incorporating Cu has little effect on sulfur adsorption capacities. Both the REO and transition metal/REO adsorbents could be regenerated completely using air for at least five repetitive cycles.

Dooley, Kerry M.; Kalakota, Vikram; Adusumilli, Sumana

2011-01-01T23:59:59.000Z

109

Red-Green Emitting and Superparamagnetic Nanomarkers Containing Fe3O4 Functionalized with Calixarene and Rare Earth Complexes  

Science Journals Connector (OSTI)

Red-Green Emitting and Superparamagnetic Nanomarkers Containing Fe3O4 Functionalized with Calixarene and Rare Earth Complexes ... ? Nuclear

Latif U. Khan; Hermi F. Brito; Jorma Hölsä; Kleber R. Pirota; Diego Muraca; Maria C.F.C. Felinto; Ercules E.S. Teotonio; Oscar L. Malta

2014-12-05T23:59:59.000Z

110

Global In-Use Stocks of the Rare Earth Elements: A First Estimate  

Science Journals Connector (OSTI)

Since 1990, China has played a dominant role in REE mining production; other countries are almost completely dependent on imports from China with respect to rare earth resources. ... The stages within the system are linked to each other by flows, the system within a particular cycle is associated with other regions by imports and exports at each stage, and all of the rare earth elements are linked through a common processing stage. ... China has traditionally employed rare earths in applications such as metallurgical additives and alloys, petroleum refining, and glass and ceramics, but new applications in China have grown significantly since 2002. ...

Xiaoyue Du; T. E. Graedel

2011-03-25T23:59:59.000Z

111

Portable X-ray fluorescence in the assessment of rare earth element-enriched sedimentary phosphate deposits  

Science Journals Connector (OSTI)

...fluorescence in the assessment of rare earth element-enriched sedimentary...considered as potential sources of rare earth elements (REEs) and...phosphate deposit|pulps|rare earth elements|recalibration...into effluents associated with phosphogypsum stockpiles and could pose a...

G.J. Simandl; R. Fajber; S. Paradis

112

PII S0016-7037(02)00888-8 EXAFS study of rare-earth element coordination in calcite  

E-Print Network [OSTI]

PII S0016-7037(02)00888-8 EXAFS study of rare-earth element coordination in calcite E. J. ELZINGA,1-structure (EXAFS) spectroscopy is used to characterize the local coordination of selected rare-earth elements (Nd3 for the increased coordination for the larger rare-earth elements involves bidentate ligation from a CO3 group

Peale, Robert E.

113

Synthesis and luminescence properties of rare earth activated phosphors for near UV-emitting LEDs for efficacious generation of white light  

E-Print Network [OSTI]

of R 2 SiO 5 (R = rare earth elements)?, Mater. Res. Bull.QE Quantum Efficiency RE Rare Earth Elements RGB Red, green,transition metal or rare earth elements. The standard

Han, Jinkyu

2013-01-01T23:59:59.000Z

114

Synthesis and characterization of visible emission from rare-earth doped aluminum nitride, gallium nitride and gallium aluminum nitride powders and thin films  

E-Print Network [OSTI]

74 (19) 2821 (1999). F. H. Spedding, Rare-earth Elements, inby the use of rare- earth elements as color emitters inpowders activated with rare-earth elements Eu 3+ , Tb 3+ ,

Tao, Jonathan Huai-Tse

2010-01-01T23:59:59.000Z

115

Rare earth element transport in the Yucca Mountain region.  

E-Print Network [OSTI]

??In sync with environmental pollution of solutes in nature, from source, process to consequence, geochemical processes (leaching and sorption) and hydraulic transportation of the rare… (more)

Zhang, Liqiong

2010-01-01T23:59:59.000Z

116

Development of the Polish wasteless technology of apatite phosphogypsum utilization with recovery of rare earths  

Science Journals Connector (OSTI)

The most promising source of rare earth elements in Poland is apatite phosphogypsum, a waste product obtained in the process of phosphoric acid production from Kola apatite. Depending on the technology used, as the hydration ratio of calcium sulphate is changed from hemihydrate to dihydrate, the content of rare earths varies from 0.6% to 0.3% Ln2O3 respectively. Technological flow charts for recovering the rare earths as a byproduct have been developed. The basic process used in the technology consists of three steps: apatite phosphogypsum leaching with dilute sulphuric acid solution; separation of rare earth concentrates from leaching sulphuric acid by preconcentration via evaporization, liquid-liquid extraction or precipitation method; anhydrite production from purified phosphogypsum by recrystallization in concentrated sulphuric acid solution.

A. Jarosi?ski; J. Kowalczyk; Cz. Mazanek

1993-01-01T23:59:59.000Z

117

Origin of enhanced magnetization in rare earth doped multiferroic bismuth ferrite  

SciTech Connect (OSTI)

We report structural and magnetic properties of rare earth doped Bi{sub 0.95}R{sub 0.05} FeO{sub 3} (R?=?Y, Ho, and Er) submicron particles. Rare earth doping enhances the magnetization and the magnetization shows an increasing trend with decreasing dopant ionic radii. In contrast to the x-ray diffraction pattern, we have seen a strong evidence for the presence of rare earth iron garnets R{sub 3}Fe{sub 5}O{sub 12} in magnetization measured as a function of temperature, in selected area electron diffraction, and in Raman measurements. Our results emphasised the role of secondary phases in the magnetic property of rare earth doped BiFeO{sub 3} compounds along with the structural distortion favoring spin canting by increase in Dzyaloshinskii-Moriya exchange energy.

Nayek, C.; Thirmal, Ch.; Murugavel, P., E-mail: muruga@iitm.ac.in [Department of Physics, Indian Institute of Technology Madras, Chennai 36 (India); Tamilselvan, A.; Balakumar, S. [National Centre for Nanoscience and Nanotechnology, University of Madras, Chennai 25 (India)

2014-02-21T23:59:59.000Z

118

Recycling Rare Earth Elements from Industrial Wastewater with Flowerlike Nano-Mg(OH)2  

Science Journals Connector (OSTI)

Recycling Rare Earth Elements from Industrial Wastewater with Flowerlike Nano-Mg(OH)2 ... The pilot-scale experiment indicated that the self-supported flowerlike nano-Mg(OH)2 had great potential to recycle REEs from industrial wastewater. ...

Chaoran Li; Zanyong Zhuang; Feng Huang; Zhicheng Wu; Yangping Hong; Zhang Lin

2013-09-13T23:59:59.000Z

119

Tricking Iron into Acting like a Rare-earth Element | The Ames...  

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

Tricking Iron into Acting like a Rare-earth Element By slipping iron between two nitrogen atoms in a lithium matrix, researchers are able to trick iron into having magnetic...

120

Geochemistry of dissolved rare earth elements in the Equatorial Pacific Ocean  

Science Journals Connector (OSTI)

Seawater samples were collected from four locations in the Equatorial Pacific Ocean during the MR02-K06 cruise of the R/V Mirai...and analyzed for dissolved rare earth elements (REEs) using inductively coupled pl...

Zhong-Liang Wang; Masatoshi Yamada

2007-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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.


121

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

122

Rare earth element partitioning between titanite and silicate melts: Henry's law revisited  

E-Print Network [OSTI]

Rare earth element partitioning between titanite and silicate melts: Henry's law revisited Stefan earth elements (REE) between titanite and a range of different silicate melts. Our results show. For geochemical modelling of magmatic processes involving titanite, and indeed other accessory phases

123

Rare Isotopes in Cosmic Explosions and Accelerators on Earth  

ScienceCinema (OSTI)

Rare isotopes are nature?s stepping stones to produce the heavy elements, and they are produced in large quantities in stellar explosions. Despite their fleeting existence, they shape the composition of the universe and the observable features of stellar explosions. The challenge for nuclear science is to produce and study the very same rare isotopes so as to understand the origin of the elements and a range of astronomical observations. I will review the progress that has been made to date in astronomy and nuclear physics, and the prospects of finally addressing many of the outstanding issues with the future Facility for Rare Isotope Beams (FRIB), which DOE will build at Michigan State University.

Hendrik Schatz

2010-01-08T23:59:59.000Z

124

PII S0016-7037(00)00772-4 Rare earth element variations resulting from inversion of pigeonite and subsolidus  

E-Print Network [OSTI]

PII S0016-7037(00)00772-4 Rare earth element variations resulting from inversion of pigeonite ion mass spectrometry study of the rare earth elements (REEs) in the minerals of two samples of lunar earth element (REE) composi- tions of the minerals in the subgroups of lunar ferroan anortho- sites

125

High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures  

SciTech Connect (OSTI)

High-pressure studies have been performed on heavy rare earth metals Terbium (Tb) to 155 GPa and Holmium (Ho) to 134 GPa in a diamond anvil cell at room temperature. The following crystal structure sequence was observed in both metals hcp {yields} Sm-type {yields} dhcp {yields} distorted fcc (hR-24) {yields} monoclinic (C2/m) with increasing pressure. The last transformation to a low symmetry monoclinic phase is accompanied by a volume collapse of 5 % for Tb at 51 GPa and a volume collapse of 3 % for Ho at 103 GPa. This volume collapse under high pressure is reminiscent of f-shell delocalization in light rare earth metal Cerium (Ce), Praseodymium (Pr), and heavy actinide metals Americium (Am) and Curium (Cm). The orthorhombic Pnma phase that has been reported in Am and Cm after f-shell delocalization is not observed in heavy rare earth metals under high pressures. (authors)

Vohra, Yogesh K.; Sangala, Bagvanth Reddy; Stemshorn, Andrew K. [Physics, University of Alabama at Birmingham (UAB), 310 Campbell Hall, 1300 University Boulevard, Birmingham, AL, 35294-1170 (United States); Hope, Kevin M. [Biology, Chemistry, and Mathematics, University of Montevallo, Harman Hall, Station 6480, Montevallo, AL, 35115 (United States)

2008-07-01T23:59:59.000Z

126

The effect of rare earth elements on the texture and formability of asymmetrically rolled magnesium sheet  

SciTech Connect (OSTI)

The lack of formability is a serious issue when considering magnesium alloys for various applications. Standard symmetric rolling introduces a strong basal texture that decreases the formability; however, asymmetric rolling has been put forward as a possible route to produce sheet with weaker texture and greater ductility. It has also been shown in recent work that weaker textures can be produced through the addition of rare earth elements to magnesium alloys. Therefore, this study has been carried out to investigate the effect of rare earth additions on the texture changes during asymmetric rolling. Two alloys have been used, AZ31B and ZEK100. The effect that the rare earth additions have on the texture of asymmetrically rolled sheet and the subsequent changes in formability will be discussed.

Alderman, Dr. Martyn [Magnesium Elektron North America; Cavin, Odis Burl [ORNL; Davis, Dr. Bruce [Magnesium Elektron North America; Muralidharan, Govindarajan [ORNL; Muth, Thomas R [ORNL; Peter, William H [ORNL; Randman, David [Magnesium Elektron North America; Watkins, Thomas R [ORNL

2011-01-01T23:59:59.000Z

127

A programme for electron-impact broadening parameter calculations of ionized rare-earth element lines  

E-Print Network [OSTI]

In order to provide atomic data needed for astrophysical investigations, a set of electron-impact broadening parameters for ionized rare-earth element lines should be calculated. We are going to calculate the electron-impact broadening parameters for more than 50 transitions of ionized rare-earth elements. Taking into account that the spectra of these elements are very complex, for calculation we can use the modified semiempirical approach - MSE or simplified MSE. Also, we can estimate these parameters on the basis of regularities and systematic trends.

L. C. Popovic; M. S. Dimitrijevic

1998-05-15T23:59:59.000Z

128

Oxidation resistance of 9-12% Cr steels: effect of rare earth surface treatment  

SciTech Connect (OSTI)

Medium Cr steels have been used in fossil fired power plants for many years because of their excellent high temperature stability and mechanical properties. The environment in a fossil fired power plant is extremely aggressive in terms of corrosion, especially oxidation. This is only accelerated as the operating temperature increases to 650C and beyond. For any new steel to be qualified for power plant use, in addition to adequate strength at the operating temperature, material wastage from all corrosion processes must be kept to a minimum acceptable level. The use of medium Cr steels provides a means to improve overall corrosion resistance. Three medium Cr are under development for use as high temperature power plant steels: 0.08C-(9-12)Cr-1.2Ni-0.7Mo-3.0Cu-3.0Co-0.5Ti. Oxidation tests were performed on the steels for times greater than 1000 hours in order to determine the oxidation kinetics and extent of material wastage. Also, rare earth oxides were incorporated into the outer surface layers of the steels to see if the oxidation resistance could be improved. These results will be compared to current power plant steels.

Dogan, Omer N.; Alman, David A.; Jablonski, Paul D.

2005-02-01T23:59:59.000Z

129

Magnetic properties of rare-earth antiferromagnets studied using a two-ion model  

Science Journals Connector (OSTI)

In this paper, a two-ion model for rare-earth antiferromagnets is proposed and employed to describe the magnetic behavior of HoNi2B2C and DyFe2Si2 at low temperatures. The calculated temperature dependence of the susceptibilities and magnetizations along the hard and easy directions, respectively, shows very good agreement with experimental results.

Z.-S. Liu; M. Diviš; V. Sechovský

2008-12-05T23:59:59.000Z

130

Thermal treatment for increasing magnetostrictive response of rare earth-iron alloy rods  

DOE Patents [OSTI]

Magnetostrictive rods formed from rare earth-iron alloys are subjected to a short time heat treatment to increase their magnetostrictive response under compression. The heat treatment is preferably carried out at a temperature of from 900 to 1,000 C for 20 minutes to six hours.

Verhoeven, J.D.; McMasters, O.D.

1989-07-18T23:59:59.000Z

131

Ternary rare earth-lanthanide sulfides. [Re = Eu, Sm or Yb  

DOE Patents [OSTI]

Disclosed is a new ternary rare earth sulfur compound having the formula La/sub 3-x/M/sub x/S/sub 4/, where M is europium, samarium, or ytterbium, with x = 0.15 to 0.8. The compound has good high-temperature thermoelectric properties and exhibits long-term structural stability up to 1000/sup 0/C.

Takeshita, Takuo; Gschneidner, K.A. Jr.; Beaudry, B.J.

1986-03-06T23:59:59.000Z

132

Hydrogen absorption characteristics of oxygen-stabilized rare-earth iron intermetallic compounds  

E-Print Network [OSTI]

Hydrogen absorption characteristics of oxygen-stabilized rare-earth iron intermetallic compounds M Abstract. -- The thermal behavior of oxygen-stabilized RjFegO^-hydrogen (R = Y, Dy, Ho) systems was studied decade to the study of the hydrogenation characte- ristics of a variety of intermetallic compounds, our

Paris-Sud XI, Université de

133

Method for harvesting rare earth barium copper oxide single crystals  

DOE Patents [OSTI]

A method of preparing high temperature superconductor single crystals is disclosed. The method of preparation involves preparing precursor materials of a particular composition, heating the precursor material to achieve a peritectic mixture of peritectic liquid and crystals of the high temperature superconductor, cooling the peritectic mixture to quench directly the mixture on a porous, wettable inert substrate to wick off the peritectic liquid, leaving single crystals of the high temperature superconductor on the porous substrate. Alternatively, the peritectic mixture can be cooled to a solid mass and reheated on a porous, inert substrate to melt the matrix of peritectic fluid while leaving the crystals melted, allowing the wicking away of the peritectic liquid. 2 figs.

Todt, V.R.; Sengupta, S.; Shi, D.

1996-04-02T23:59:59.000Z

134

Cubic rare-earth compounds: Variants of the three-state Potts model  

Science Journals Connector (OSTI)

In appropriate cubic fields rare-earth ions have sixfold degenerate ground states. When the angular momentum of the rare earth is large, the six levels are characterized by states that are directed along the cube edges. Within these states the angular momentum operators Jx, Jy, and Jz have particularly simple matrix representations. The projection of an isotropic pair coupling between the rare earths onto these sixfold degenerate states leads to an interaction Hamiltonian H=-I??ij??i?j?lilj, where ? takes on the values ± 1 and l the values x, y, and z. This interaction is a variant of the three-state Potts model. We add magnetic and quadrupolar anisotropy field terms to the Hamiltonian and determine the symmetry properties of the phase diagram associated with this model. For nonzero quadrupolar anisotropy fields, the model is shown to have the thermodynamic behavior of an Ising model. However, for zero fields we find a new symmetry appears and in the mean-field approximation the model has tricritical-like exponents. This simple model is able to account for the large specific-heat critical exponent ??=12 which has been observed for holmium antimonide in zero external fields. To the extent that the mean-field approximation is an accurate guide, we predict there are many cubic rare-earth compounds which exhibit tricritical-like behavior in zero field. In addition we find that for pure quadrupole coupling between rare earths in the sixfold degenerate states, the interaction Hamiltonian is exactly the three-state Potts model. In the mean-field approximation this system has a first-order phase transition. However, a small quadrupolar anisotropy field is sufficient to drive the system to a wing critical point. The specific heat has a critical exponent of ?=23 or 1 depending on the path taken to approach this critical point.

D. Kim; Peter M. Levy; L. F. Uffer

1975-08-01T23:59:59.000Z

135

Rare Earth Element sorption by basaltic rock: experimental data and modeling results using the "Generalised Composite approach".  

E-Print Network [OSTI]

Rare Earth Element sorption by basaltic rock: experimental data and modeling results using Email address : emmanuel.tertre@univ-poitiers.fr Keywords: sorption, lanthanides, basalt, surface.1016/j.gca.2007.12.015 #12;Abstract Sorption of the 14 Rare Earth Elements (REE) by basaltic rock

Paris-Sud XI, Université de

136

Magnetic properties of exchange-coupled trilayers of amorphous rare-earth-cobalt alloys  

Science Journals Connector (OSTI)

From amorphous thin films from alloys of rare earths (Gd, Sm), yttrium or zirconium with cobalt we have prepared trilayers with very clean interfaces appropriate for the study of magnetic coupling. The sandwiches were typically Y-Co/Gd-Co/Y-Co and Sm-Co/X/Sm-Co|IH (X=Gd-Co, Co-Zr, Co). The three individual layers are coupled magnetically by exchange interactions between cobalt moments throughout the entire sample. This coupling associated with the specific properties of the given alloy (magnetic moment, anisotropy, coercivity) leads to ferrimagnetic or ferromagnetic structures of the magnetization of adjacent layers and to novel magnetization processes. For systems consisting of magnetically hard external layers with different coercivities and a soft central layer (Sm-Co/X/Sm-Co|IH, X=Gd-Co, Co-Zr), the influence of the central layer's thickness and type of the material on coupling and magnetization processes have been studied quantitatively. Numerical simulations using a one-dimensional model for describing the magnetization processes observed in sandwich systems fit the magnetization curves of these model systems particularly well.

S. Wüchner; J. C. Toussaint; J. Voiron

1997-05-01T23:59:59.000Z

137

Upconversion-pumped luminescence efficiency of rare-earth-doped hosts sensitized with trivalent ytterbium  

SciTech Connect (OSTI)

We discuss the upconversion luminescence efficiencies of phosphors that generate red, green, and blue light. The phosphors studied are single crystals and powders co-doped with Er{sup 3+} and Yb{sup 3+}, and with Tm{sup 3+} and Yb{sup 3+}. The Yb ions are pumped near 980 nm; transfers of two or three quanta to the co-doped rare earth ion generate visible luminescence. The main contribution embodied in this work is the quantitative measurement of this upconversion efficiency, based on the use of a calibrated integrating sphere, determination of the fraction of pump light absorbed, and careful control of the pump laser beam profile. The green phosphors are the most efficient, yielding efficiency values as high as 4 %, with the red and blue materials giving 1 - 2 %. Saturation was observed in all cases, suggesting that populations of upconversion steps of the ions are maximized at higher power. Quasi-CW modeling of the intensity- dependent upconversion efficiency was attempted; input data included level lifetimes, transition cross sections, and cross-relaxation rate coefficients. The saturation of the Yb,Er:fluoride media is explained as the pumping of Er{sup 3+} ions into a bottleneck (long-lived state)- the {sup 4}I{sub 13/2} metastable level, making them unavailable for further excitation transfer. 32 refs., 5 figs., 3 tabs.

Page, R.H.; Schaffers, K.I.; Waide, P.A.; Tassano, J.B.; Payne, S.A.; Kruplce, W.F.; Bischel, W.K. [Gemfire Corporation, Palo Alto, CA (United States)

1997-07-26T23:59:59.000Z

138

Superconductivity up to 114 K in the Bi-Al-Ca-Sr-Cu-O compound system without rare-earth elements  

Science Journals Connector (OSTI)

Stable superconductivity up to 114 K has been reproducibly detected in Bi-Al-Ca-Sr-Cu-O multiphase systems without any rare-earth elements. Pressure has only a slight positive effect on Tc. These observations provide an extra material base for the study of the mechanism of high-temperature superconductivity and also the prospect of reduced material cost for future applications of superconductivity.

C. W. Chu; J. Bechtold; L. Gao; P. H. Hor; Z. J. Huang; R. L. Meng; Y. Y. Sun; Y. Q. Wang; Y. Y. Xue

1988-03-07T23:59:59.000Z

139

Influence of double-electron transitions on the EXAFS L edges of rare-earth systems  

Science Journals Connector (OSTI)

This work presents an x-ray-absorption study at the L edges of several rare-earth compounds. In both L1-edge and L3-edge spectra, anomalous features are clearly detected in the EXAFS region and have been associated with the creation of 2s4d and 2p4d double-core hole states, respectively. Comparison of theoretical calculations with the experiments are carried out using the results of explicit computation of cross sections for the allowed mainline (L edge) and double-electron (LN4,5 edges) which identify the transitions expected to be observable. In addition, the excitation energies of all of these allowed transitions are given. The influence of multielectron transitions on the EXAFS data analysis is discussed for several rare-earth-based systems. An estimate of the error introduced by neglecting the presence of double-electron transitions on coordination numbers and bond distances is given, based on these experimental data.

Jesús Chaboy; Augusto Marcelli; Trevor A. Tyson

1994-05-01T23:59:59.000Z

140

Charge screening and magnetic anisotropy in metallic rare-earth systems  

Science Journals Connector (OSTI)

The calculation of magnetic anisotropy constants is performed beyond the point-charge model for a continuous charge-density distribution of screening conduction electrons. An important role of the nonuniform electron density, in particular, of the Friedel oscillations, in the formation of crystal field is demonstrated. Such effects can modify strongly the effective ion (impurity) charge and even change its sign. This enables one to justify the anion model, which is often used for discussing experimental data on hydrogen-containing systems. Possible applications to the pure rare-earth metals and RCo5 (R=rare earth) compounds are discussed. The deformation of magnetic structure near the interstitial positive muon owing to the strong local anisotropy, and the corresponding contribution to the dipole field at the muon are considered.

V. Yu. Irkhin and Yu. P. Irkhin

1998-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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
to obtain the most current and comprehensive results.


141

Orbital-resolved spin model for thermal magnetization switching in rare-earth-based ferrimagnets  

Science Journals Connector (OSTI)

The switching of rare-earth-based ferrimagnets triggered by thermal excitation is investigated on the basis of an atomistic spin model beyond the rigid-spin approximation, distinguishing magnetic moments due to electrons in d and f orbitals of the rare earth. It is shown that after excitation of the conduction electrons a transient ferromagneticlike state follows from a dissipationless spin dynamics where energy and angular momentum are distributed between the two sublattices. The final relaxation can then lead to a new state with the magnetization switched with respect to the initial state. The time scale of the switching event is to a large extent determined by the exchange interaction between the two sublattices.

S. Wienholdt; D. Hinzke; K. Carva; P. M. Oppeneer; U. Nowak

2013-07-24T23:59:59.000Z

142

Maria Goeppert Mayer's Theoretical Work on Rare-Earth and Transuranic Elements  

E-Print Network [OSTI]

After the discovery of element 93 neptunium by Edwin McMillan and Philip H. Abelson in 1941, Maria Goeppert Mayer applied the Thomas-Fermi model to calculate the electronic configuration of heavy elements and predicted the occurrence of a second rare-earth series in the vicinity of elements 91 or 92 extending to the transuranic elements. Mayer was motivated by Enrico Fermi, who was at the time contemplating military uses of nuclear energy. Historical development of nuclear science research leading to Mayer's publication is outlined. Mayer's method is introduced with the aid of a computer, which enables students to visualize her description of eigenfunctions, particularly the sudden change of spatial distribution and eigenenergy at the beginning of the rare-earth series. The impact of Mayer's work on the periodic table is discussed.

Wang, Frank Y

2008-01-01T23:59:59.000Z

143

Pt nanoparticles modified by rare earth oxides: Electronic effect and influence to catalytic hydrogenation of 3-phenoxybenzaldehyde  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: • The rare earths modified Pt/Al{sub 2}O{sub 3} were prepared by colloidal deposition method. • Modification of Pt by the rare earth enhanced catalytic hydrogenation activity. • The activity improvement is due to electron interaction between Pt and rare earth. • The hydrogenation mechanism of rare earth modified Pt catalyst was proposed. - Abstract: The rare earth elements (La, Ce, Nd, Sm, Pr, and Gd) modified Pt/Al{sub 2}O{sub 3} catalysts were prepared by the colloidal deposition and chemical reduction methods, respectively. Pt nanoparticles with average size 3 ± 0.5 nm were uniformly dispersed on the surface of Al{sub 2}O{sub 3} for the samples prepared by the colloidal deposition method, which exhibited higher activities in the hydrogenation of 3-phenoxybenzadehyde than the corresponding samples prepared by chemical reduction method. Moreover, except Gd, the catalysts modified by rare earth elements showed better catalytic performance than unmodified Pt/Al{sub 2}O{sub 3}. For Pt–Ce/Al{sub 2}O{sub 3} catalyst, when the weight percent of Pt and Ce was 0.5 and 0.25, respectively, the hydrogenation conversion of 3-phenoxybenzaldehyde was 97.3% after 6 h reaction. This activity improvement is due to the electronic interaction between Pt and rare earth elements, which was investigated by X-ray photoelectron spectroscopy.

Mou, Zhigang; Han, Ming; Li, Gang; Du, Yukou [College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (China); Yang, Ping, E-mail: pyang@suda.edu.cn [College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (China); Zhang, Hailu [Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123 (China); Deng, Zongwu, E-mail: zwdeng2007@sinano.ac.cn [Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123 (China)

2013-11-15T23:59:59.000Z

144

Rare-earth amorphous alloys: Nonaxial crystal-field model and induced magnetism  

Science Journals Connector (OSTI)

The consequences of the induced magnetism on amorphous rare-earth systems with singlet ground state are analyzed on the basis of the Fert and Campbell Hamiltonian assuming a suitable distribution of the asymmetry parameter. The formal treatment is developed for both the ferromagnetic and antiferromagnetic interaction in the molecular-field approximation. The magnetization, the specific heat, and the magnetic susceptibility of Pr amorphous alloys, in particular, are discussed.

E. Borchi and S. De Gennaro

1982-02-01T23:59:59.000Z

145

Tunneling Model of Phase Changes in Tetragonal Rare-Earth Crystals  

Science Journals Connector (OSTI)

The crystal-field theory for a rare-earth ion in tetragonal symmetry is studied in a semiclassical description. The low-lying quantum states are interpreted as tunneling states between classical minima. At low temperatures, spontaneous lattice distortions occur to lower some of the minima relative to others. The model is applied to DyVO4 and TbVO4 and is shown to lead to a good understanding of why they show phase changes and unusual paramagnetic properties.

E. Pytte and K. W. H. Stevens

1971-09-27T23:59:59.000Z

146

Self-assembled rare-earth silicide nanowires on Si(001)  

SciTech Connect (OSTI)

This paper presents scanning tunneling microscope images of several rare-earth metal silicides grown on silicon (001). For certain of the metals studied (Dy, Ho), an anisotropy in lattice match with the substrate results in the formation of nanowires. These nanowires have desirable properties such as nanometer lateral dimension, crystalline structure with a low density of defects, and micrometer scale length. Tunneling spectroscopy on the nanowires indicates that they are metallic.

Nogami, J.; Liu, B. Z.; Katkov, M. V.; Ohbuchi, C.; Birge, Norman O.

2001-06-15T23:59:59.000Z

147

Method of increasing magnetostrictive response of rare earth-iron alloy rods  

DOE Patents [OSTI]

This invention comprises a method of increasing the magnetostrictive response of rare earth-iron (RFe) magnetostrictive alloy rods by a thermal-magnetic treatment. The rod is heated to a temperature above its Curie temperature, viz. from 400 to 600 C; and, while the rod is at that temperature, a magnetic field is directionally applied and maintained while the rod is cooled, at least below its Curie temperature. 2 figs.

Verhoeven, J.D.; McMasters, O.D.; Gibson, E.D.; Ostenson, J.E.; Finnemore, D.K.

1989-04-04T23:59:59.000Z

148

Synthesis of metastable rare-earth-iron mixed oxide with the hexagonal crystal structure  

SciTech Connect (OSTI)

Rare-earth-iron mixed oxides with the rare earth/iron ratio=1 have either orthorhombic (o-REFeO{sub 3}) or hexagonal (h-REFeO{sub 3}) structure. h-REFeO{sub 3} is a metastable phase and the synthesis of h-REFeO{sub 3} is usually difficult. In this work, the crystallization process of the precursors obtained by co-precipitation and Pechini methods was investigated in detail to synthesize h-REFeO{sub 3}. It was found that the crystallization from amorphous to hexagonal phase and the phase transition from hexagonal to orthorhombic phase occurred at a similar temperature range for rare earth elements with small ionic radii (Er-Lu, Y). For both co-precipitation and Pechini methods, single-phase h-REFeO{sub 3} was obtained by shortening the heating time during calcination process. The hexagonal-to-orthorhombic phase transition took place by a nucleation growth mechanism and vermicular morphology of the thus-formed orthorhombic phase was observed. The hexagonal YbFeO{sub 3} had higher catalytic activity for C{sub 3}H{sub 8} combustion than orthorhombic YbFeO{sub 3}. - Graphical abstract: Although the synthesis of metastable hexagonal REFeO{sub 3} by the conventional method is difficult, we found that this phase is obtained by shortening the heating time of the precursor prepared by co-precipitation method. Highlights: Black-Right-Pointing-Pointer Synthesis of metastable REFeO{sub 3} with hexagonal structure by the co-precipitation method. Black-Right-Pointing-Pointer Hexagonal REFeO{sub 3} is obtained for the rare earth elements with small ionic radii. Black-Right-Pointing-Pointer Hexagonal-to-orthorhombic transformation of REFeO{sub 3}. Black-Right-Pointing-Pointer Catalytic activity of hexagonal REFeO{sub 3} for C{sub 3}H{sub 8} combustion.

Nishimura, Tatsuya [Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510 (Japan); Hosokawa, Saburo, E-mail: hosokawa@scl.kyoto-u.ac.jp [Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510 (Japan); Masuda, Yuichi; Wada, Kenji; Inoue, Masashi [Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510 (Japan)

2013-01-15T23:59:59.000Z

149

Pseudocrystalline model of the magnetic anisotropy in amorphous rare-earth–transition-metal thin films  

Science Journals Connector (OSTI)

A pseudocrystalline model is proposed to explain the occurrence of perpendicular anisotropy in amorphous rare-earth–transition metal (R-T) thin films. It is based on the central hypothesis that during layer-by-layer growth small planar hexagonal units are formed defining on average a preferential axis perpendicular to the film plane. The units are similar in structure to relaxed crystalline ones and are estimated to typically comprise six rare-earth atoms. They are regarded as an idealized model of the short-range order and are consistent with the known nearest-neighbor R-T and T-T coordination numbers in the amorphous state. This model is able to explain the known experimental results concerning the influence of composition, substrate temperature, annealing, and bombardment effects during sputter deposition on the magnetic anisotropy of thin amorphous rare-earth–transition-metal films of the system (Nd, Tb, Dy) (Fe, Co), as well as the destruction of this anisotropy by additives.

D. Mergel; H. Heitmann; P. Hansen

1993-01-01T23:59:59.000Z

150

Journal of the Korean Physical Society, Vol. 38, No. 6, June 2001, pp. 744749 Photoemission Study of Rare-Earth Ditelluride Compounds  

E-Print Network [OSTI]

levels of the rare-earth elements, we found that all the rare-earth elements were trivalent. We also made for the rare-earth elements, and found that the La and Gd 3d peaks were well explained by our calculations. There was very little change in the lineshapes of the Te 3d peaks of different rare-earth elements. On the other

Oh, Se-Jung

151

Pourret Olivier, Gruau Grard, Dia Aline, Davranche Mlanie, and Molnat Jrome. (2010) Colloidal control on the distribution of rare earth elements in shallow  

E-Print Network [OSTI]

control on the distribution of rare earth elements in shallow groundwaters. Aquatic Geochemistry 16 (1 OF RARE EARTH ELEMENTS IN SHALLOW GROUNDWATERS Olivier Pourret1, 2, § , Gérard Gruau1,* , Aline Dia1;3 Abstract A 7-year monitoring period of rare earth element (REE) concentrations and REE pattern shapes

Paris-Sud XI, Université de

152

What would we do without rare earths? | Critical Materials Institute  

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

are a big part of our modern world. They are in clean energy technologies like wind turbines and solar cells and in many things we use every day -- cars, cell phones,...

153

Iron-Nitride-Based Magnets: Synthesis and Phase Stabilization of Body Center Tetragonal (BCT) Metastable Fe-N Anisotropic Nanocomposite Magnet- A Path to Fabricate Rare Earth Free Magnet  

SciTech Connect (OSTI)

REACT Project: The University of Minnesota will develop an early stage prototype of an iron-nitride permanent magnet material for EVs and renewable power generators. This new material, comprised entirely of low-cost and abundant resources, has the potential to demonstrate the highest energy potential of any magnet to date. This project will provide the basis for an entirely new class of rare-earth-free magnets capable of generating power without costly and scarce rare earth materials. The ultimate goal of this project is to demonstrate a prototype with magnetic properties exceeding state-of-the-art commercial magnets.

None

2012-01-01T23:59:59.000Z

154

Effect of pressure on Knight shifts in rare-earth singlet ground-state systems  

Science Journals Connector (OSTI)

Pressure effects on Knight shifts of rare-earth and pnictide nuclei, contained in intermetallic compounds, have been measured to 4 kbar as a function of temperature from 4 K to as high as 300 K. An attempt to separate the effects of crystal field and exchange was made. Even with the inclusion of exchange (via simple parameterization), the often used point-charge model is unable to account in a straightforward manner for the results. We attribute the behavior to conduction-electron effects.

H. T. Weaver and J. E. Schirber

1976-08-01T23:59:59.000Z

155

Long-Range Order of Dilute Rare-Earth Spin Ensemble Revealed with Cavity QED  

E-Print Network [OSTI]

This work demonstrates strong coupling regime between an Erbium ion spin ensemble and Hybrid Cavity-Whispering Gallery Modes in a Yttrium Aluminium Garnet dielectric crystal. Coupling strengths of $220$~MHz and mode quality factors in excess of $10^6$ are demonstrated. The spin ensemble exhibits memory effects as well as remnant magnetisation. A qualitative change of system magnetic field response between 190 and 445mK is interpreted as a phase transition. This work is the first observation of the long range order in an ensemble of dilute Rare-Earth impurities similar to the phenomenon of dilute ferromagnetism in semiconductors.

W. G. Farr; M. Goryachev; J. M. le Floch; P. Bushev; M. E. Tobar

2014-11-29T23:59:59.000Z

156

Rare-earth plasma extreme ultraviolet sources at 6.5-6.7 nm  

SciTech Connect (OSTI)

We have demonstrated a laser-produced plasma extreme ultraviolet source operating in the 6.5-6.7 nm region based on rare-earth targets of Gd and Tb coupled with a Mo/B{sub 4}C multilayer mirror. Multiply charged ions produce strong resonance emission lines, which combine to yield an intense unresolved transition array. The spectra of these resonant lines around 6.7 nm (in-band: 6.7 nm {+-}1%) suggest that the in-band emission increases with increased plasma volume by suppressing the plasma hydrodynamic expansion loss at an electron temperature of about 50 eV, resulting in maximized emission.

Otsuka, Takamitsu; Higashiguchi, Takeshi; Yugami, Noboru; Yatagai, Toyohiko [Department of Advanced Interdisciplinary Sciences, Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Kilbane, Deirdre; White, John; Dunne, Padraig; O'Sullivan, Gerry [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Jiang, Weihua [Department of Electrical Engineering, Nagaoka University of Technology, Kami-tomiokamachi 1603-1, Nagaoka, Niigata 940-2188 (Japan); Endo, Akira [Forschungszentrum Dresden, Bautzner Landstrs. 400, D-01328 Dresden (Germany)

2010-09-13T23:59:59.000Z

157

Tar Reforming in Model Gasifier Effluents: Transition Metal/Rare Earth Oxide Catalysts  

Science Journals Connector (OSTI)

Tar Reforming in Model Gasifier Effluents: Transition Metal/Rare Earth Oxide Catalysts ... So in this work we investigated the action of transition metal oxides (TMOs) other than Ni (e.g., Fe, Mn) mixed with REOs for tar reforming, at a medium temperature range (923–1073 K) and under conditions where direct reforming would dominate. ... The heated gas mixture passed through a 1/2” stainless steel tube containing 0.2–1 g of catalyst (40–60 mesh size) diluted with mullite and positioned between beds of ?-Al2O3. ...

Rui Li; Amitava Roy; Joseph Bridges; Kerry M. Dooley

2014-04-24T23:59:59.000Z

158

Synchrotron Diffraction Studies of Spontaneous Magnetostriction in Rare Earth Transition Metal Compounds  

SciTech Connect (OSTI)

Thermal expansion anomalies of R{sub 2}Fe{sub 14}B and R{sub 2}Fe{sub 17}C{sub x} (x = 0,2) (R = Y, Nd, Gd, Tb, Er) stoichiometric compounds are studied with high-energy synchrotron X-ray powder diffraction using Debye-Schemer geometry in temperature range 10K to 1000K. Large spontaneous magnetostriction up to their Curie temperatures (T{sub c}) is observed. The a-axes show relatively larger invar effects than c-axes in the R{sub 2}Fe{sub 14}B compounds whereas the R{sub 2}Fe{sub 17}C{sub x} show the contrary anisotropies. The iron sub-lattice is shown to dominate the spontaneous magnetostriction of the compounds. The contribution of the rare earth sublattice is roughly proportional to the spin magnetic moment of the rare earth in the R{sub 2}Fe{sub 14}B compounds but in R{sub 2}Fe{sub 17}C{sub x}, the rare earth sub-lattice contribution appears more likely to be dominated by the local bonding. The calculation of spontaneous magnetostrain of bonds shows that the bonds associated with Fe(j2) sites in R{sub 2}Fe{sub 14}B and the dumbbell sites in R{sub 2}Fe{sub 17}C{sub x} have larger values, which is strongly related to their largest magnetic moment and Wigner-Seitz atomic cell volume. The roles of the carbon atoms in increasing the Curie temperatures of the R{sub 2}Fe{sub 17} compounds are attributed to the increased separation of Fe hexagons. The R{sub 2}Fe{sub 17} and R{sub 2}Fe{sub 14}B phases with magnetic rare earth ions also show anisotropies of thermal expansion above T{sub c}. For R{sub 2}Fe{sub 17} and R{sub 2}Fe{sub 14}B the a{sub a}/a{sub c} > 1 whereas the anisotropy is reversed with the interstitial carbon in R{sub 2}Fe{sub 17}. The average bond magnetostrain is shown to be a possible predictor of the magnetic moment of Fe sites in the compounds. Both of the theoretical and phenomenological models on spontaneous magnetostriction are discussed and a Landau model on the spontaneous magnetostriction is proposed.

Ning Yang

2004-12-19T23:59:59.000Z

159

A Tof-SIMS analysis of the effect of lead nitrate on rare earth flotation  

Science Journals Connector (OSTI)

Abstract The influence of lead nitrate on rare earth flotation in the presence of hydroxamates as collectors has been investigated by a combination of micro-flotation tests and time of flight secondary ion mass spectrometry (ToF-SIMS) surface chemical analysis. Micro-flotation tests identified a link between lead nitrate dose and an improved grade of REE minerals for concentrates. The testing also identified differences in the flotation behaviour of light rare earth (LREEs, La or Ce bearing minerals) and Y and Zr bearing minerals. TOF-SIMS analyses evaluated the variability in surface components on undifferentiated REE grains from the concentrates and tails samples in response to the varied lead nitrate dosing in micro-flotation tests. The surface analyses showed that both the REE grains and gangue phases reporting to the concentrate have higher relative surface proportions of both Pb and collectors as compared to those reporting to the tails. It is noted that the lead does not appear to be associated with an increase in collector adsorption, so the grade of REE can go up is not by selective adsorption of collectors. The significantly higher intensity of Pb species identified on the surface of the concentrate would suggest that lead addition can actually reverse the surface charge making it efficient for collectors to adsorb onto surfaces that they could not easily close to. It is also possible PbOH+ potentially acting as a point activator.

Liuyin Xia; Brian Hart; Brandon Loshusan

2015-01-01T23:59:59.000Z

160

PII S0016-7037(02)01117-1 Diopside-bearing EL6 EET 90102: Insights from rare earth element distributions  

E-Print Network [OSTI]

PII S0016-7037(02)01117-1 Diopside-bearing EL6 EET 90102: Insights from rare earth element a study of the rare earth element (REE) distributions in EET 90102, with a specific emphasis on diopside or rare in other terrestrial or extra- terrestrial rocks. Typically, lithophile elements form sulfide

Note: This page contains sample records for the topic "rare earth materials" 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

Naturally occurring radioactive material (NORM V): proceedings of an international symposium, Seville, Spain, 19–22 March 2007  

Science Journals Connector (OSTI)

......their decay chain members in rare earth minerals is often enough...occupational exposure during rare earth production gives rise...variety of monazite mining and rare earth recovery industries...environmental weathering of stacked phosphogypsum waste materials, with observed......

William E. Kennedy; Jr.

2010-03-01T23:59:59.000Z

162

Rare earth magnetic order in RNi{sub 2}B{sub 2}C and RNiBC  

SciTech Connect (OSTI)

A review of neutron diffraction experiments on the magnetic order in the RNi{sub 2}B{sub 2}C and RNiBC (R-rare earth) systems is given. The RNi{sub 2}B{sub 2}C materials exhibit a wide variety of commensurate and incommensurate magnetic structures for different rare earths, along with superconductivity that is coupled to the magnetism. Simple commensurate antiferromagnetic structures are observed for R = Pr (T{sub N} = 4.0 K), Nd (T{sub N} = 4.8 K), Ho (T{sub N} = 8.5 K) and Dy (T{sub N} = 4.8 K). In addition, HoNi{sub 2}B{sub 2}C exhibits a c-axis spiral and an a-axis modulated incommensurate structure above 5 K, while both structures collapse in favor of the commensurate structure at low T. A transversely polarized spin density wave (SDW) type incommensurate structure is observed for Er (T{sub N} = 6.8 K) and Tm (T{sub N} = 1.5 K), while a longitudinally polarized SDW structure is observed for Tb (T{sub N} = 15 K). No magnetic ordering of any type is detected for Y, Ce and Yb. HoNiBC is an antiferromagnet (T{sub N} = 9.8 K), ErNiBC is a ferromagnetic (T{sub C} = 4.6 K), while TbNiBC and DyNiBC exhibit both ferromagnetic and antiferromagnetic ordering at 17 K and {approximately} 13 K, respectively.

Skanthakumar, S. [Argonne National Lab., IL (United States). Chemistry Div.; Lynn, J.W. [National Inst. of Standards, Gaithersburg, MD (United States). Center for Neutron Research

1998-07-05T23:59:59.000Z

163

Effects of rare earth oxides and UO2 + x on the structure and the mechanical properties of Zircaloy  

Science Journals Connector (OSTI)

Tension test specimens of Zircaloy have been annealed with simulated fission products, as CeO2, La2O3, Nd2O3, Y2O3 or mixtures of these rare earth oxides and UO2 + x at 350°C up to 10 000 hours and at 500 or 700°C up to 2000 hours. The long term effects have been studied by tension tests, scanning electron microscopy, X-ray diffraction and metallography. Annealing of Zircaloy at 700°C with rare earth oxides generally leads to total embrittlement. There exists a gradation of efficacy which becomes obvious when the results of the annealing series at 500°C are compared. Rare earth oxides in mixtures with UO2 + x cause improportional intense reductions of ductility. The structural characteristics of specimens lead to thermodynamic considerations of the probable reaction mechanism.

Fritz Holub

1985-01-01T23:59:59.000Z

164

The impact of trade costs on rare earth exports : a stochastic frontier estimation approach.  

SciTech Connect (OSTI)

The study develops a novel stochastic frontier modeling approach to the gravity equation for rare earth element (REE) trade between China and its trading partners between 2001 and 2009. The novelty lies in differentiating betweenbehind the border' trade costs by China and theimplicit beyond the border costs' of China's trading partners. Results indicate that the significance level of the independent variables change dramatically over the time period. While geographical distance matters for trade flows in both periods, the effect of income on trade flows is significantly attenuated, possibly capturing the negative effects of financial crises in the developed world. Second, the total export losses due tobehind the border' trade costs almost tripled over the time period. Finally, looking atimplicit beyond the border' trade costs, results show China gaining in some markets, although it is likely that some countries are substituting away from Chinese REE exports.

Sanyal, Prabuddha; Brady, Patrick Vane; Vugrin, Eric D.

2013-09-01T23:59:59.000Z

165

Separation of tervalent transplutonium and rare-earth elements using for-tveks  

SciTech Connect (OSTI)

The authors study the distribution of curium, americium, and certain rare-earth elements (REE) between aqueous nitric acid solutions and FOR-tveks under static and dynamic conditions. It is shown that on introducing diethylenetriaminepentaacetic acid into the aqueous solution separation coefficients for the transplutonium elements and REE can be obtained which are sufficiently high for practical use. A method is proposed for the group separation of REE and transplutonium elements under dynamic conditions. On a column 22 cm high coefficients of approximately 500 are obtained for the purification of curium from cerium, more than 260 from neodymium, 250 from lanthanum, and 14 from europium and gadolinium. The possibility has been studied of separating palladium from transplutonium elements and REE and isolating it as an individual product.

Zaitsev, B.N.; Korolev, V.A.; Korovin, Y.F.; Kuzovov, Y.I.; Kvasnitskii, I.B.; Popik, V.P.

1986-03-01T23:59:59.000Z

166

Magnetization switching of rare earth orthochromite CeCrO{sub 3}  

SciTech Connect (OSTI)

We report the synthesis of single phase rare earth orthochromite CeCrO{sub 3} and its magnetic properties. A canted antiferromagnetic transition with thermal hysteresis at T?=?260?K is observed, and a magnetic compensation (zero magnetization) near 133?K is attributed to the antiparallel coupling between Ce{sup 3+} and Cr{sup 3+} moments. At low temperature, field induced magnetization reversal starting from 43?K for H?=?1.2 kOe reveals the spin flip driven by Zeeman energy between the net moments and the applied field. These findings may find potential uses in magnetic switching devices such as nonvolatile magnetic memory which facilitates two distinct states of magnetization.

Cao, Yiming; Cao, Shixun, E-mail: sxcao@shu.edu.cn; Ren, Wei; Feng, Zhenjie; Yuan, Shujuan; Kang, Baojuan; Zhang, Jincang [Department of Physics, Shanghai University, Shanghai 200444 (China); Lu, Bo [Laboratory for Microstructures, Shanghai University, Shanghai 200444 (China)

2014-06-09T23:59:59.000Z

167

Ion implantation of rare-earth dopants in ferromagnetic thin films  

SciTech Connect (OSTI)

We show that high-dose ion implantation can be used to introduce rare-earth dopants for the control of precessional dynamics in magnetic thin films. Tb and Gd ions have been implanted in Ni{sub 81}Fe{sub 19} through Ta masks at dosages from 1x10{sup 14}/cm{sup 2} to 1x10{sup 15}/cm{sup 2}. Effects on dynamics are found to be similar to those contributed by cosputtered Tb and Gd dopants in Ni{sub 81}Fe{sub 19} (50 nm). Broadband ferromagnetic resonance measurements from 0 to 18 GHz show that adjustments in damping {alpha} from 0.008 to 0.040 are fully intrinsic (Gilbert type) and roughly proportional to dose. The technique enables the creation of films with spatially modulated precessional characteristics.

Dasgupta, V.; Litombe, N.; Bailey, W. E.; Bakhru, H. [Materials Science Program, Department of Applied Physics, Columbia University, 500 West 120th Street, New York, New York 10027 (United States); College of Nanoscale Science and Engineering, SUNY Albany, 251 Fuller Road, Albany, New York 12203 (United States)

2006-04-15T23:59:59.000Z

168

Photoeffect cross sections of several rare-earth elements for 323-keV photons  

Science Journals Connector (OSTI)

Total-attenuation cross sections of the oxides of rare-earth elements such as La, Ce, Pr, Nd, Sm, Gd, Dy, Ho, and Er, and also NaNO3 and NaNO2 have been measured in a narrow-beam geometry setup at 323 keV. The total-attenuation cross section for oxygen was obtained as the difference in NaNO3 and NaNO2 cross sections. Using this, the total-attenuation cross sections of the individual lanthanides have been obtained with the aid of the mixture rule. From these, the photoeffect cross sections were derived by subtracting the scattering contribution. These values are found to agree well with Scofield’s theoretical data [University of California Report No. UCRL 51326, 1973 (unpublished)].

T. K. Umesh, S. J. Anasuya, J. Shylaja Kumari, Channe Gowda, K. P. Gopinathan Nair, and Ramakrishna Gowda

1992-02-01T23:59:59.000Z

169

New Rare Earth Element Abundance Distributions for the Sun and Five r-Process-Rich Very Metal-Poor Stars  

E-Print Network [OSTI]

We have derived new abundances of the rare-earth elements Pr, Dy, Tm, Yb, and Lu for the solar photosphere and for five very metal-poor, neutron-capture r-process-rich giant stars. The photospheric values for all five elements are in good agreement with meteoritic abundances. For the low metallicity sample, these abundances have been combined with new Ce abundances from a companion paper, and reconsideration of a few other elements in individual stars, to produce internally-consistent Ba, rare-earth, and Hf (56element distributions. These have been used in a critical comparison between stellar and solar r-process abundance mixes.

Sneden, Christopher; Cowan, John J; Ivans, Inese I; Hartog, Elizabeth A Den

2009-01-01T23:59:59.000Z

170

On-the-fly machine-learning for high-throughput experiments: search for rare-earth-free permanent magnets  

SciTech Connect (OSTI)

Advanced materials characterization techniques with ever-growing data acquisition speed and storage capabilities represent a challenge in modern materials science, and new procedures to quickly assess and analyze the data are needed. Machine learning approaches are effective in reducing the complexity of data and rapidly homing in on the underlying trend in multi-dimensional data. Here, we show that by employing an algorithm called the mean shift theory to a large amount of diffraction data in high-throughput experimentation, one can streamline the process of delineating the structural evolution across compositional variations mapped on combinatorial libraries with minimal computational cost. Data collected at a synchrotron beamline are analyzed on the fly, and by integrating experimental data with the inorganic crystal structure database (ICSD), we can substantially enhance the accuracy in classifying the structural phases across ternary phase spaces. We have used this approach to identify a novel magnetic phase with enhanced magnetic anisotropy which is a candidate for rare-earth free permanent magnet.

Kusne, Aaron Gilad [University of Maryland; Gao, Tieren [University of Maryland; Mehta, Apurva [SLAC National Accelerator Laboratory; Ke, Liqin [Ames Laboratory; Nguyen, Manh Cuong [Ames Laboratory; Ho, Kai-Ming [Ames Laboratory; Antropov, Vladimir [Ames Laboratory; Wang, Cai-Zhuang [Ames Laboratory; Kramer, Matthew J [Ames Laboratory; Long, Christian [University of Maryland; Takeuchi, Ichiro [University of Maryland

2014-09-15T23:59:59.000Z

171

Subcell Structure and Two Different Superstructures of the Rare Earth Metal Silicide Carbides Y  

SciTech Connect (OSTI)

The title compounds crystallize with a very pronounced subcell structure that has been determined from single-crystal X-ray diffractometer data of all four compounds. Only subcell (and no superstructure) reflections have been observed for Pr{sub 3}Si{sub 2}C{sub 2}: space group Cmmm, a=396.7(1) pm, b=1645.2(3) pm, c=439.9(1) pm, R=0.019 for 309 structure factors and 20 variable parameters. In this subcell structure there are C{sub 2} pairs with split atomic positions. This structure may be considered the thermodynamically stable forms of these compounds at high temperatures. Two different superstructures with doubled a or c axes, respectively, of the subcell have been observed, where the C{sub 2} pairs have different orientations. In the structure of Tb{sub 3}Si{sub 2}C{sub 2} the a axis of the subcell is doubled. The resulting superstructure in the standard setting has the space group Pbcm: a=423.6(1) pm, b=770.7(1) pm, c=1570.2(3) pm, R=0.031 f or 1437 structure factors and 22 variable parameters. Dy{sub 3}Si{sub 2}C{sub 2} has the same superstructure: a=420.3(1) pm, b=767.5(1) pm, c=1561.1(3) pm, R=0.045, 801 F values, 22 variables. In the structure of Y{sub 3}Si{sub 2}C{sub 2} the c axis of the subcell is doubled, resulting in a body-centered space group with the standard setting Imma: a=842.6(2) pm, b=1563.4(2) pm, c=384.6(1) pm, R=0.035, 681 F values, 15 variables. In all of these structures the rare earth atoms form two-dimensionally infinite sheets of edge-sharing octahedra that contain the C{sub 2} pairs. In between these sheets there are zig-zag chains of silicon atoms with Si-Si distances varying between 246.2(3) and 253.6(3) pm, somewhat longer than the two-electron bonds of 235 pm in elemental silicon, suggesting a bond order of 0.5 for the Si-Si bonds. The C-C distances in the C{sub 2} pairs vary between 127(1) and 131(1) pm, corresponding to a bond order of approximately 2. 5. Hence, using oxidation numbers, the compounds may to a first approximation be represented by the formula (R{sup +3}){sub 3}(Si{sup {minus}3}){sub 2}(C{sub 2}){sup {minus}3}. A more detailed analysis of the interatomic distances showed that the shortest R-R distances are comparable with the R-R distances in the structures of the rare earth elements, thus indicating some R-R bonding. Therefore, the oxidation numbers of the rare earth atoms are slightly lower than +3, in agreement with the metallic conductivity of these compounds. As a consequence, considering the relatively short Si-Si bonds, the absolute value of the oxidation number of the silicon atoms may be lower than 3, resulting in a Si-Si bond order somewhat higher than 0.5.

Jeitschko, Wolfgang; Gerdes, Martin H.; Witte, Anne M.; Rodewald, Ute Ch.

2001-01-01T23:59:59.000Z

172

Nuclear Resonant Scattering on Earth Materials using Synchrotron Radiation  

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

NRS2005 Home NRS2005 Home Agenda Organizing Committee Nuclear Resonant Scattering on Earth Materials using Synchrotron Radiation February 12-13, 2005 Advanced Photon Source Argonne National Laboratory - Argonne, Illinois, USA Nuclear Resonant Scattering (NRS) techniques provide the Earth and planetary science community with opportunities for new and exciting results on the properties of materials at high pressure and temperature conditions. Such NRS experiments have become possible due to the extreme brightness of third-generation synchrotron radiation sources. NRS techniques fall into two broad areas, which are in many ways ideally or even uniquely suited for addressing a number of important geophysical questions: Nuclear Resonant Inelastic X-ray Scattering (NRIXS) provides information on

173

Exchange interaction in binuclear complexes with rare-earth and copper ions: A many-body model study  

Science Journals Connector (OSTI)

We have used a many-body model Hamiltonian to study the nature of the magnetic ground state of heterobinuclear complexes involving rare-earth and copper ions. We have taken into account all diagonal repulsions involving the rare-earth 4f and 5d orbitals and the copper 3d orbital. In addition, we have included direct exchange interaction, crystal field splitting of the rare-earth atomic levels and spin-orbit interaction in the 4f orbitals. We have identified the interorbital 4f repulsion Uff and crystal field parameter ?f as the key parameters involved in controlling the type of exchange interaction between the rare earth 4f and copper 3d spins. We have explored the nature of the ground state in the parameter space of Uff, ?f, spin-orbit interaction strength ?, and the 4f filling nf. We find that these systems show low-spin or high-spin ground state depending on the filling of the 4f levels of the rare-earth ion and ground state spin is critically dependent on Uff and ?f. In case of half filling [Gd(III)] we find a reentrant low-spin state as Uff is increased, for small values of ?f, which explains the recently reported apparent anomalous antiferromagnetic behavior of Gd(III)-radical complexes. By varying Uff we also observe a switch over in the ground state spin for other fillings. We have introduced a spin-orbit coupling scheme which goes beyond the L-S or j-j coupling scheme and we find that spin-orbit coupling does not significantly alter the basic picture.

Indranil Rudra; C. Raghu; S. Ramasesha

2002-05-28T23:59:59.000Z

174

Melted Murataite Ceramics Containing Simulated Actinide/Rare Earth Fraction of High Level Waste  

SciTech Connect (OSTI)

Murataite-based ceramics with three different chemical compositions containing simulated actinide/rare earth (RE) fraction of HLW were produced in a resistive furnace at a temperature of 1500 deg. C and two of them - in a cold crucible energized from a 5.28 MHz/10 kW high frequency generator. All the samples prepared in resistive furnace were composed of major murataite and minor perovskite, crichtonite, zirconolite, and pyrophanite/ilmenite. The samples produced in the cold crucible were composed of murataite, perovskite, crichtonite, and rutile. Higher content of perovskite and crichtonite in the cold crucible melted ceramic than in the ceramic with the same chemical composition but melted in resistive furnace may be due to higher temperature in the cold crucible (up to 1600-1650 deg. C) at which some fraction of murataite was subjected to decomposition yielding additional amount of perovskite and crichtonite. Method of melting may effect on elemental partitioning in the murataite-containing ceramics because light (Ce-group) REs enter preferably perovskite phase whereas Nd, Sm, and heavy (Y-group) REs are accommodated in the murataite polytypes. Thus, perovskite and murataite are major host phases for the Ce- and Y-group REs, respectively, whereas tetravalent actinides (U) enter murataite only.

Stefanovsky, S.V.; Ptashkin, A.G.; Knyazev, O.A.; Zen'kovskaya, M.S.; Stefanovsky, O.I. [State Unitary Enterprise SIA Radon, Moscow (Russian Federation); Yudintsev, S.V.; Nikonov, B.S.; Lapina, M.I. [Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian, Academy of Sciences (IGEM RAS), Moscow (Russian Federation)

2008-07-01T23:59:59.000Z

175

Dynamical properties of a crystalline rare-earth boron cluster spin-glass system  

Science Journals Connector (OSTI)

Dynamical properties of the magnetic B12 cluster compound HoB22C2N were investigated. HoB22C2N is taken to be representative of the class of trigonal and rhombohedral B12 cluster compounds which were found to exhibit spin-glass behavior as measured by dc superconducting quantum interference device magnetometer and specific-heat measurements. These are examples of magnetic glassiness being observed in rare earth boron-rich crystalline cluster compounds. Well defined maxima in the in-phase linear ac susceptibility ?? curves were observed, indicative of the spin-glass transition. Strong frequency dependence of the cusp temperature Tf was found. The dependence of Tf could not be analyzed satisfactorily by the dynamical scaling theory of a three-dimensional spin glass. A more detailed investigation of the behavior of relaxation times by Cole-Cole analysis showed that the behavior in HoB22C2N is different from the simple blocking of a superparamagnetic system, because of the temperature dependence of the parameter ? representing the width of the relaxation-time distribution function g(?). The median relaxation time was also determined and the data were found to be described well in terms of a generalized Arrhenius law ln ??T-2.5. These results indicate that HoB22C2N is a two-dimensional spin-glass system, which supports what has been speculated previously.

Takao Mori and Hiroaki Mamiya

2003-12-18T23:59:59.000Z

176

Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making  

DOE Patents [OSTI]

A method of making a permanent magnet is disclosed wherein (1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and (2) TR (where TR is a transition metal selected from at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Al) and at least one of C and N are provided in the base alloy composition melt in substantially stoichiometric amounts to form a thermodynamically stable compound (e.g. TR carbide, nitride or carbonitride). The melt is rapidly solidified in a manner to form particulates having a substantially amorphous (metallic glass) structure and a dispersion of primary TRC, TRN and/or TRC/N precipitates. The amorphous particulates are heated above the crystallization temperature of the base alloy composition to nucleate and grow a hard magnetic phase to an optimum grain size and to form secondary TRC, TRN and/or TRC/N precipitates dispersed at grain boundaries. The crystallized particulates are consolidated at an elevated temperature to form a shape. During elevated temperature consolidation, the primary and secondary precipitates act to pin the grain boundaries and minimize deleterious grain growth that is harmful to magnetic properties. 33 figs.

McCallum, R.W.; Branagan, D.J.

1996-01-23T23:59:59.000Z

177

Coherent storage of microwave excitations in rare-earth nuclear spins  

E-Print Network [OSTI]

Interfacing between various elements of a computer - from memory to processors to long range communication - will be as critical for quantum computers as it is for classical computers today. Paramagnetic rare earth doped crystals, such as Nd$^{3+}$:Y$_2$SiO$_5$ (YSO), are excellent candidates for such a quantum interface: they are known to exhibit long optical coherence lifetimes (for communication via optical photons), possess a nuclear spin (memory) and have in addition an electron spin that can offer hybrid coupling with superconducting qubits (processing). Here we study two of these three elements, demonstrating coherent storage and retrieval between electron and $^{145}$Nd nuclear spin states in Nd$^{3+}$:YSO. We find nuclear spin coherence times can reach 9 ms at $\\approx 5$ K, about two orders of magnitude longer than the electron spin coherence, while quantum state and process tomography of the storage/retrieval operation reveal an average state fidelity of 0.86. The times and fidelities are expected to further improve at lower temperatures and with more homogeneous radio-frequency excitation.

Gary Wolfowicz; Hannes Maier-Flaig; Robert Marino; Alban Ferrier; Hervé Vezin; John J. L. Morton; Philippe Goldner

2014-12-23T23:59:59.000Z

178

Soft-Sphere Model for Nuclear Quadrupole Resonance: Rare-Earth Trichlorides under Hydrostatic Pressure  

Science Journals Connector (OSTI)

Nuclear quadrupole resonance of Cl35 in five hexagonal rare-earth trichlorides under hydro-static pressure up to 5×103 kg/cm2 showed a decrease in frequency ? with increase in pressure. The normalized pressure coefficients ?0-1 (???P)T varied smoothly between the extremes (-5.586 ± 0.020) × (10-6 cm2/kg) and (-3.855 ± 0.016) × (10-6 cm2/kg) for CeCl3 and GdCl3, respectively. The negative sign suggested a model with a significant overlap contribution to the electric field gradient and a soft-sphere model was developed in analogy to the Born-Mayer model of inter-ionic repulsive forces. This model proved adequate to explain the systematic variations in ?Q with compound and was consistent with the pressure dependence of ?. The use of pressure data as a critical test for the model must await reliable compressibility data for the compounds. Pressure data for monoclinic ErCl3 and YbCl3 are also presented.

David H. Current; C. L. Foiles; Edward H. Carlson

1972-08-01T23:59:59.000Z

179

Ternary rare earth and actinoid transition metal carbides viewed as carbometalates  

SciTech Connect (OSTI)

Ternary carbides A{sub x}T{sub y}C{sub z} (A=rare earth metals and actinoids; T=transition metals) with monoatomic species C{sup 4-} as structural entities are classified according to the criteria (i) metal to carbon ratio, (ii) coordination number of the transition metal by carbon atoms, and (iii) the dimensionality of the anionic network [T{sub y}C{sub z}]{sup n-}. Two groups are clearly distinguishable, depending on the metal to carbon ratio. Those where this ratio is equal to or smaller than 2 may be viewed as carbometalates, thus extending the sequence of complex anions from fluoro-, oxo-, and nitridometalates to carbometalates. The second group, metal-rich carbides with metal to carbon ratios equal to or larger than 4 is better viewed as typical intermetallics (''interstitial carbides''). The chemical bonding properties have been investigated by analyzing the Crystal Orbital Hamilton Population (COHP). The chemical bonding situation with respect to individual T-C bonds is similar in both classes. The main difference is the larger number of metal-metal bonds in the crystal structures of the metal-rich carbides.

Dashjav, Enkhtsetseg [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, D-01187 Dresden (Germany); Kreiner, Guido [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, D-01187 Dresden (Germany); Schnelle, Walter [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, D-01187 Dresden (Germany); Wagner, Frank R. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, D-01187 Dresden (Germany); Kniep, Ruediger [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, D-01187 Dresden (Germany)], E-mail: Kniep@cpfs.mpg.de; Jeitschko, Wolfgang [Institut fuer Anorganische und Analytische Chemie, Universitaet Muenster, Wilhelm-Klemm-Strasse 8, D-48149 Muenster (Germany)], E-mail: jeitsch@uni-muenster.de

2007-02-15T23:59:59.000Z

180

4f-derived photoemission and 4f-ligand hybridization in light rare-earth halides  

Science Journals Connector (OSTI)

We have studied the 4f-derived photoemission spectra of insulating Ce, Pr, and Nd trihalides by resonant photoemission spectroscopy. A double-peak structure is observed in every f spectrum as in metallic Ce, Pr, and Nd compounds and is successfully analyzed in terms of the cluster model. This confirms that the two peaks arise from hybridization between the 4f and ligand p orbitals rather than from two different screening channels of the f hole. The f-ligand hybridization strength is found to decrease on going from the Ce to Pr to Nd compounds, but appears to remain significantly large for heavier rare earths, suggesting the importance of hybridization effects in heavy rare-earth compounds.

A. Fujimori; T. Miyahara; T. Koide; T. Shidara; H. Kato; H. Fukutani; S. Sato

1988-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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.


181

Low-Temperature Relaxation Effects in Pulsed-Field Electron-Paramagnetic-Resonance Spectra of Rare-Earth Ions  

Science Journals Connector (OSTI)

Spin-lattice relaxation effects have been observed in the pulsed-field EPR spectra of rare earths in yttrium aluminum garnet, yttrium gallium garnet, and CaF2. An analysis has been developed that permits evaluation of the spin-lattice relaxation rates. It is shown that for a number of Kramers-doublet rare-earth ions, at frequencies above 70 Gc/sec and at liquid-helium temperatures, the only important relaxation mechanism is the direct spin-phonon interaction due to modulation of the crystalline field by lattice vibrations. The effects of paramagnetic impurity concentration and low-lying excited states on relaxation rates have also been observed, and, where appropriate, their influence is included in the analysis and discussion.

L. Rimai; R. W. Bierig; B. D. Silverman

1966-06-03T23:59:59.000Z

182

Lattice stability of aluminum-rare earth binary systems: A first-principles approach  

Science Journals Connector (OSTI)

The thermodynamics of over 330 compounds in 15 Al-RE (RE=rare earth elements) binary systems is studied via first-principles density-functional theory at low-temperature limit. The calculated phase stabilities at T=0K are in very good agreement with experimentally reported ones for the majority of the systems. For example, we show the Al2RE.cF24 structure is the most stable compound phase in each binary and it indeed has the highest (congruent) melting point in each system. In some other cases, we obtain results previously unknown experimentally. For example, we suggest that the structure of the observed compound AlTm2 is isostructural with Co2Si.oP12 (prototype Co2Si, Pearson symbol oP12), we confirm the stability of AlEu.oP20 rather than AlEu.oP18 by examining the energetics of vacancy substitution, and we predict the unreported Al-Pm phase diagram. Relative accuracy of different potentials and calculational details are addressed. This study predicts that the Al-RE phase diagrams evolve systematically across the entire RE series, interrupted by anomalies at elements Ce and especially Eu and Yb. Trends in lattice stability across the RE series are explained on the basis of interatomic bonding and strain. This study demonstrates that first-principles calculations can be employed to (1) further examine and improve the experimentally established binary-alloy phase diagrams, and (2) provide accurate enthalpy data for stable and hypothetical compounds and structures.

Michael C. Gao; Anthony D. Rollett; Michael Widom

2007-05-31T23:59:59.000Z

183

Nuclear-decay studies of neutron-rich rare-earth nuclides  

SciTech Connect (OSTI)

Neutron-rich rare-earth nuclei were produced in multinucleon transfer reactions of {sup 170}Er and {sup 176}Yb projectiles on {sup nat}W targets at the Lawrence Berkeley Laboratory SuperHILAC and their radioactive decays properties studied at the on-line mass separation facility OASIS. Two unknown isotopes, {sup 169}Dy (t {sub 1/2} {equals} 39 {plus minus} 8 s) and {sup 174}Er(t{sub 1/2} {equals} 3.3 {plus minus} 0.2 m) were discovered and their decay characteristics determined. The decay schemes for two previously identified isotopes, {sup 168}Dy (t{sub 1/2} {equals} 8.8 {plus minus} 0.3 m) and {sup 171}Ho (t{sub 1/2} {equals} 55 {plus minus} 3 s), were characterized. Evidence for a new isomer of 3.0 m {sup 168}Ho{sup g}, {sup 168}Ho{sup m} (t{sub 1/2} {equals} 132 {plus minus} 4 s) which decays by isomeric transition (IT) is presented. Beta particle endpoint energies were determined for the decay of {sup 168}Ho{sup g}, {sup 169}Dy, {sup 171}Ho, and {sup 174}Er, the resulting Q{beta}-values are: 2.93 {plus minus} 0.03, 3.2 {plus minus} 0.3, 3.2 {plus minus} 0.6, and 1.8 {plus minus} 0.2 MeV, respectively. These values were compared with values calculated using recent atomic mass formulae. Comparisons of various target/ion source geometries used in the OASIS mass separator facility for these multinucleon transfer reactions were performed. 73 refs., 40 figs., 11 tabs.

Chasteler, R.M. (California Univ., Berkeley, CA (USA). Dept. of Chemistry Lawrence Berkeley Lab., CA (USA))

1990-04-26T23:59:59.000Z

184

CMI Industry Survey | Critical Materials Institute  

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

in professional development or continuing education courses in these areas: Yes No Rare earth elements Yes No Other critical materials Yes No Converting rare earth ore to metal Yes...

185

Derivation of an optical potential for statically deformed rare-earth nuclei from a global spherical potential  

E-Print Network [OSTI]

The coupled-channel theory is a natural way of treating nonelastic channels, in particular those arising from collective excitations characterized by nuclear deformations. A proper treatment of such excitations is often essential to the accurate description of experimental nuclear-reaction data and to the prediction of a wide variety of scattering observables. Stimulated by recent work substantiating the near validity of the adiabatic approximation in coupled-channel calculations for scattering on statically deformed nuclei, we explore the possibility of generalizing a global spherical optical model potential (OMP) to make it usable in coupled-channel calculations on this class of nuclei. To do this, we have deformed the Koning-Delaroche global spherical potential for neutrons, coupling a sufficient number of states of the ground state band to ensure convergence. We present an extensive study of the effects of collective couplings and nuclear deformations on integrated cross sections as well as on angular distributions for neutron-induced reactions on statically deformed nuclei in the rare-earth region. We choose isotopes of three rare-earth elements (Gd, Ho, W), which are known to be nearly perfect rotors, to exemplify the results of the proposed method. Predictions from our model for total, elastic and inelastic cross sections, as well as for elastic and inelastic angular distributions, are in reasonable agreement with measured experimental data. These results suggest that the deformed Koning-Delaroche potential provides a useful regional neutron optical potential for the statically deformed rare earth nuclei.

G. P. A. Nobre; A. Palumbo; F. S. Dietrich; M. Herman; D. Brown; S. Hoblit

2014-12-22T23:59:59.000Z

186

Recovery of Trace Rare Earths from High-Level Fe3+ and Al3+ Waste of Oil Shale Ash (Fe?Al?OSA)  

Science Journals Connector (OSTI)

State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P.R. China, and Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. ... Rare earth elements are finding increasing use in various industries as catalysts for petroleum cracking, metallurgy, glass and ceramics, electronics, chemicals, magnets, and nuclear industries, and in the manufacture of various types of phosphors, lamps, mantles, and many others. ... (14) Considering this situation, all governments have strengthened the regulation of import and export of rare earth products and especially emphasized safety and environmental issues of chemical engineering in recent years. ...

Hualing Yang; Wei Wang; Dongli Zhang; Yuefeng Deng; Hongming Cui; Ji Chen; Deqian Li

2010-10-08T23:59:59.000Z

187

(Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2009. All  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2009. All yttrium. Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805.30.0000 5.0% ad. Other rare-earth compounds, including yttrium oxide >85% Y2O3, yttrium nitrate, and other individual

188

[Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted] Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2010. All  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2010. All yttrium. Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805.30.0000 5.0% ad. Other rare-earth compounds, including yttrium oxide >85% Y2O3, yttrium nitrate, and other individual

189

(Data in metric tons of yttrium oxide (Y2O3) content, unless noted) Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the  

E-Print Network [OSTI]

Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth ores and concentrates (monazite) 2612.20.0000 Free Free. Rare-earth metals, scandium and yttrium

190

(Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2008. All  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2008. All yttrium 12-31-08 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and compounds containing by weight >19% to rare-earth compounds, including

191

(Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnsite  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnäsite at Mountain Pass, CA, but was not recovered as a separate element during processing. Bastnäsite, a rare-earth Number Normal Trade Relations 12/31/02 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth

192

(Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2006. All  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2006. All yttrium-31-06 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and yttrium and compounds containing by weight >19% to rare-earth compounds, including

193

(Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2003.  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2003. Yttrium Relations 12/31/03 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and compounds containing by weight >19% to rare-earth compounds, including

194

(Data in metric tons of yttrium oxide (Y O ) content, unless otherwise noted)2 3 Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the  

E-Print Network [OSTI]

Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth.20.0000 Free Free. Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805

195

(Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2004. Yttrium  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2004. Yttrium Relations 12-31-04 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and compounds containing by weight >19% to rare-earth compounds, including

196

(Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnasite,  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth fluocarbonate mineral, was mined and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and yttrium, whether or not intermixed

197

(Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral  

E-Print Network [OSTI]

Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth fluocarbonate mineral, was mined.20.0000 Free. Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 2805.30.0000 5

198

(Data in metric tons of yttrium oxide (Y O ) content, unless otherwise noted)2 3 Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the  

E-Print Network [OSTI]

Domestic Production and Use: The rare-earth element, yttrium, was mined by one company as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth/31/96 Thorium ores and concentrates (monazite) 2612.20.0000 Free Free. Rare-earth metals, scandium and yttrium

199

(Data in metric tons of yttrium oxide (Y2O3) content unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was not mined in the United States in 2005. All  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was not mined in the United States in 2005. All yttrium-31-05 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth metals, scandium and yttrium and compounds containing by weight >19% to rare-earth compounds, including

200

(Data in metric tons of yttrium oxide (Y O ) content, unless otherwise noted)2 3 Domestic Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral bastnasite,  

E-Print Network [OSTI]

Domestic Production and Use: The rare-earth element, yttrium, was mined as a constituent of the mineral bastnasite, but was not recovered as a separate element during processing. Bastnasite, a rare-earth/31/98 Thorium ores and concentrates (monazite) 2612.20.0000 Free Free. Rare-earth metals, scandium and yttrium

Note: This page contains sample records for the topic "rare earth materials" 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

Formation of partial energy gap below the structural phase transition and the rare-earth element-substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)  

E-Print Network [OSTI]

Formation of partial energy gap below the structural phase transition and the rare-earth element phonon modes display systematic shifts toward high frequency upon rare-earth element Nd and Sm temperature Tc was raised beyond 50 K through the substitution of La by rare-earth elements. Tc is found

Wang, Wei Hua

202

(Data in metric tons of yttrium oxide (Y2O3) content, unless otherwise noted) Domestic Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnasite  

E-Print Network [OSTI]

Production and Use: The rare-earth element yttrium was mined as a constituent of the mineral bastnasite at Mountain Pass, CA, but was not recovered as a separate element during processing. Bastnasite, a rare-earth Number Normal Trade Relations 12/31/01 Thorium ores and concentrates (monazite) 2612.20.0000 Free. Rare-earth

203

Nonphotochemical hole burning of organic dyes and rare earth ions in polymers and glasses: a probe of the amorphous state  

SciTech Connect (OSTI)

New and in depth studies of amorphous materials (e.g., glasses and polymers) probed via the low temperature optical technique of nonphotochemical hole burning (NPHB) are presented. An extensive review of the phenomena itself, along with selected topics involving the use of persistent hole burning techniques, is given. In addition, a semi-complete tabulation of essentially all hole burning systems to date is included. The deuteration dependence in an amorphous host is examined for the system of tetracene in an ethanol/methanol mixture. The results illustrate the importance of hydrogen bonding in the hole burning process. The discovery of a highly efficient (or facile) class of hole burning systems, i.e., ionic dyes in hydroxylated polymers (i.e., poly(vinyl alcohol) (PVOH) and poly(acrylic acid) (PAA)), is presented and discussed. Ultrafast relaxation processes (i.e., dephasing) are studied for the system of cresyl violet perchlorate (CV) in PVOH. Further, for the first time, NPHB of rare earth ions, specifically Pr/sup +3/ and Nd/sup +3/, in a soft organic glass (i.e., PVOH) is discussed briefly. Detailed experimental results of two related phenomena, spontaneous hole filling (SPHF) and laser induced hole filling (LIHF), are presented and discussed for several systems: rhodamine 560 perchlorate (R560), rhodamine 640 perchlorate (R640), CV, Pr/sup +3/ and Nd..mu../sup 3/ in either PVOH or PAA. A theoretical model is developed for SPHF. The model invokes a correlated feedback mechanism from the anti-hole, which is able to account for the fact that no line broadening is observed. A tentative model is also presented for the phenomenon of LIHF.

Fearey, B.L.

1986-01-01T23:59:59.000Z

204

Yttrium and rare earth elements in fluids from various deep-sea hydrothermal systems  

SciTech Connect (OSTI)

Rare earth element (REE) and yttrium (Y) concentrations were measured in fluids collected from deep-sea hydrothermal systems including the Mid-Atlantic Ridge (MAR), i.e., Menez Gwen, Lucky Strike, TAG, and Snakepit; the East Pacific Rise (EPR), i.e., 13{degree}N and 17--19{degree}S; and the Lau (Vai Lili) and Manus (Vienna Woods, PacManus, Desmos) Back-arc Basins (BAB) in the South-West Pacific. In most fluids, Y is trivalent and behaves like Ho. Chondrite normalized Y-REE (Y-REE{sub N}) concentrations of fluids from MAR, EPR, and two BAB sites, i.e., Vai Lili and Vienna Woods, showed common patterns with LREE enrichment and positive Eu anomalies. REE analysis of plagioclase collected at Lucky Strike strengthens the idea that fluid REE contents, are controlled by plagioclase phenocrysts. Other processes, however, such as REE complexation by ligands (Cl{sup {minus}}, F{sup {minus}}, So{sub 4}{sup 2{minus}}), secondary phase precipitation, and phase separation modify REE distributions in deep-sea hydrothermal fluids. REE speciation calculations suggest that aqueous REE are mainly complexed by Cl{sup {minus}} ions in hot acidic fluids from deep-sea hydrothermal systems. REE concentrations in the fluid phases are, therefore, influenced by temperature, pH, and duration of rock-fluid interaction. Unusual Y-REE{sub N} patterns found in the PacManus fluids are characterized by depleted LREE and a positive Eu anomaly. The Demos fluid sample shows a flat Y-REE{sub N} pattern, which increases regularly from LREE to HREE with no Eu anomaly. These Manus Basin fluids also have an unusual major element chemistry with relatively high Mg, So{sub 4}, H{sub 2}S, and F contents, which may be due to the incorporation of magmatic fluids into heated seawater during hydrothermal circulation. REE distribution in PacManus fluids may stem from a subseafloor barite precipitation and the REE in Demos fluids are likely influenced by the presence of sulfate ions.

Douville, E. [Univ. Bretagne Occidentale, Brest (France). Dept. de Chimie] [Univ. Bretagne Occidentale, Brest (France). Dept. de Chimie; [IFREMER Centre de Brest, Plouzane (France); Appriou, P. [Univ. Bretagne Occidentale, Brest (France)] [Univ. Bretagne Occidentale, Brest (France); Bienvenu, P. [CEA Cadarache, Saint Paul Lez Durance (France). Lab. d`Analyses Radiochimiques et Chimiques] [CEA Cadarache, Saint Paul Lez Durance (France). Lab. d`Analyses Radiochimiques et Chimiques; Charlou, J.L.; Donval, J.P.; Fouquet, Y. [IFREMER Centre de Brest, Plouzane (France)] [IFREMER Centre de Brest, Plouzane (France); Gamo, Toshitaka [Univ. of Tokyo, Nakano, Tokyo (Japan). Ocean Research Inst.] [Univ. of Tokyo, Nakano, Tokyo (Japan). Ocean Research Inst.

1999-03-01T23:59:59.000Z

205

Reduction Chemistry of Rare-Earth Metal Complexes: Toward New Reactivity and Properties  

E-Print Network [OSTI]

reactor and was named promethium. Even Nature could onlyrare-earths (except for promethium and europium; ytterbiumeuropium and radioactive promethium) on hand, we synthesized

Huang, Wenliang

2013-01-01T23:59:59.000Z

206

Theory of low energy excitations in resonant inelastic x-ray scattering for rare-earth systems: Yb compounds as typical examples  

Science Journals Connector (OSTI)

Theoretical predictions are given for low energy excitations, such as crystal field excitations and Kondo resonance excitations, to be detected by high-resolution measurements of resonant inelastic x-ray scattering (RIXS) of rare-earth materials with Yb compounds as typical examples. Crystal field excitations in the Yb 3d RIXS of a Yb3+ ion in the cubic crystal field are formulated, and the calculation of RIXS spectra for YbN is done. Kondo resonance excitations revealed in the Yb 3d RIXS spectra are calculated for mixed-valence Yb compounds, Yb1-xLuxAl3, in the leading term approximation of the 1/Nf expansion method with a single impurity Anderson model. It is emphasized that the high-resolution RIXS with polarization dependence is a powerful tool to study the crystal field levels together with their symmetry and also the Kondo bound state in rare-earth compounds. Some in-depth discussions are given on the polarization effects of RIXS, including 4d and 2p RIXS spectra, the coherence effect of the Kondo bound states, and the importance of the high-resolution RIXS spectra for condensed matter physics under extreme conditions.

A. Kotani

2011-04-25T23:59:59.000Z

207

Solid-Liquid and Solid-Solid Transformations in the Rare-Earth Metals at High Pressures  

Science Journals Connector (OSTI)

The fusion behavior and solid-solid transformations in the rare-earth metals have been investigated at pressures in the range 6-65 kbar. The phase diagrams are presented for La, Pr, Nd, Sm, Gd, and Tb. The initial melting slopes of Dy to Lu have been obtained. Since most of the rare-earth (R.E.) metals melt from a bcc structure, they offer a series for comparison. When the initial melting slope is plotted against atomic number they fall into groups according to their valency; the typically divalent metals Eu and Yb in one, and the typically trivalent metals La, Gd, and Lu in another. Samarium and the metals from Tb to Tm have melting slopes which are intermediate between those of the typically divalent and trivalent metals. It is suggested that these metals assume a partial divalent character in the liquid state and possibly also in the bcc phase. This suggestion derives support from the fact that the gaseous neutral atoms of the R.E. elements, with the exception of La, Gd, and Lu, have no 5d electron and are therefore divalent. Cerium exhibits a unique fusion behavior and its negative melting slope has been attributed to the tetravalency (4f?5d electron promotion) of the atoms in the liquid. For the very small melting slope of Pr, it is suggested that the atoms in the liquid have partial tetravalent character due to 4f?5d electron promotion. Comparisons with alkali metals are made and it is deduced that the R.E. metals are quite compressible at high temperatures. Pressure induced transformations in the rare-earth metals are in the sequence hcp?Sm-type?double hcp?fcc. A plausible mechanism based on the variation of ca ratio with pressure is discussed for hcp?Sm-type transformation.

A. Jayaraman

1965-08-02T23:59:59.000Z

208

Processing and Protection of Rare Earth Permanent Magnet Particulate for Bonded Magnet Applications  

SciTech Connect (OSTI)

Rapid solidification of novel mixed rare earth-iron-boron, MRE{sub 2}Fe{sub 14}B (MRE = Nd, Y, Dy; currently), magnet alloys via high pressure gas atomization (HPGA) have produced similar properties and structures as closely related alloys produced by melt spinning (MS) at low wheel speeds. Recent additions of titanium carbide and zirconium to the permanent magnet (PM) alloy design in HPGA powder (using He atomization gas) have made it possible to achieve highly refined microstructures with magnetic properties approaching melt spun particulate at cooling rates of 10{sup 5}-10{sup 6}K/s. By producing HPGA powders with the desirable qualities of melt spun ribbon, the need for crushing ribbon was eliminated in bonded magnet fabrication. The spherical geometry of HPGA powders is more ideal for processing of bonded permanent magnets since higher loading fractions can be obtained during compression and injection molding. This increased volume loading of spherical PM powder can be predicted to yield a higher maximum energy product (BH){sub max} for bonded magnets in high performance applications. Passivation of RE-containing powder is warranted for the large-scale manufacturing of bonded magnets in applications with increased temperature and exposure to humidity. Irreversible magnetic losses due to oxidation and corrosion of particulates is a known drawback of RE-Fe-B based alloys during further processing, e.g. injection molding, as well as during use as a bonded magnet. To counteract these effects, a modified gas atomization chamber allowed for a novel approach to in situ passivation of solidified particle surfaces through injection of a reactive gas, nitrogen trifluoride (NF{sub 3}). The ability to control surface chemistry during atomization processing of fine spherical RE-Fe-B powders produced advantages over current processing methodologies. In particular, the capability to coat particles while 'in flight' may eliminate the need for post atomization treatment, otherwise a necessary step for oxidation and corrosion resistance. Stability of these thin films was attributed to the reduction of each RE's respective oxide during processing; recognizing that fluoride compounds exhibit a slightly higher (negative) free energy driving force for formation. Formation of RE-type fluorides on the surface was evidenced through x-ray photoelectron spectroscopy (XPS). Concurrent research with auger electron spectroscopy has been attempted to accurately quantify the depth of fluoride formation in order to grasp the extent of fluorination reactions with spherical and flake particulate. Gas fusion analysis on coated powders (dia. <45 {micro}m) from an optimized experiment indicated an as-atomized oxygen concentration of 343ppm, where typical, nonpassivated RE atomized alloys exhibit an average of 1800ppm oxygen. Thermogravimetric analysis (TGA) on the same powder revealed a decreased rate of oxidation at elevated temperatures up to 300 C, compared to similar uncoated powder.

Peter Kelly Sokolowski

2007-12-01T23:59:59.000Z

209

Density of states of a semi-infinite rare-earth metal with magnetic structure: A simple model  

Science Journals Connector (OSTI)

Using a simple tight-binding model and the transfer matrix approach, we have calculated the spectral density of states (SDOS) of a rare-earth metal in the presence of a surface for different magnetic arrangements (such as ferromagnetic, antiferromagnetic, and conical orderings). The local density of states (LDOS) has also been calculated for some examples, integrating the SDOS over the Brillouin zone. The main effect observed deals with the absence of Van Hove's singularities in the surface LDOS, a fact that appears to be an intrinsic property of the surface. Finally the relaxation of the overlap parameters at the surface is discussed and some numerical examples are shown.

Bernardo Laks and G. G. Cabrera

1979-09-15T23:59:59.000Z

210

18F-Labeled Magnetic-Upconversion Nanophosphors via Rare-Earth Cation-Assisted Ligand Assembly  

Science Journals Connector (OSTI)

18F-Labeled Magnetic-Upconversion Nanophosphors via Rare-Earth Cation-Assisted Ligand Assembly ... The inset of Figure S7 shows the bright-field photo of AA-Gd-UCNPs dispersed in PBS for 0 and 48 h. ... To determine whether UCNPs coated with folic acid and aminocaproic acid (FA-AA-Gd-UCNPs, FA:AA = 1:9) could be used for cellular targeted imaging, we performed in vitro cellular studies using FR-positive [FR(+)] KB cell lines and FR-negative [FR(?)] MCF-7 cell lines. ...

Qian Liu; Yun Sun; Chenguang Li; Jing Zhou; Chunyan Li; Tianshe Yang; Xianzhong Zhang; Tao Yi; Dongmei Wu; Fuyou Li

2011-03-08T23:59:59.000Z

211

Robust quantum gates and a bus architecture for quantum computing with rare-earth-ion doped crystals  

E-Print Network [OSTI]

We present a composite pulse controlled phase gate which together with a bus architecture improves the feasibility of a recent quantum computing proposal based on rare-earth-ion doped crystals. Our proposed gate operation is tolerant to variations between ions of coupling strengths, pulse lengths, and frequency shifts, and it achieves worst case fidelities above 0.999 with relative variations in coupling strength as high as 10% and frequency shifts up to several percent of the resonant Rabi frequency of the laser used to implement the gate. We outline an experiment to demonstrate the creation and detection of maximally entangled states in the system.

Janus Wesenberg; Klaus Moelmer

2003-01-09T23:59:59.000Z

212

Parity assignments in Yb172,174 using polarized photons and the K quantum number in rare earth nuclei  

Science Journals Connector (OSTI)

The 100% polarized photon beam at the high intensity ? ray source (HI?S) at Duke University has been used to determine the parity of six dipole excitations between 2.9 and 3.6 MeV in the deformed nuclei Yb172,174 in photon scattering (??,?') experiments. The measured parities are compared with previous assignments based on the K quantum number that had been assigned in nuclear resonance fluorescence (NRF) experiments by using the Alaga rules. A systematic survey of the relation between ?-decay branching ratios and parity quantum numbers is given for the rare earth nuclei.

D. Savran; S. Müller; A. Zilges; M. Babilon; M. W. Ahmed; J. H. Kelley; A. Tonchev; W. Tornow; H. R. Weller; N. Pietralla; J. Li; I. V. Pinayev; Y. K. Wu

2005-03-08T23:59:59.000Z

213

Inelastic exchange scattering in electron-energy-loss spectroscopy: Localized excitations in transition-metal and rare-earth systems  

Science Journals Connector (OSTI)

Cross sections for quasiatomic excitation by exchange scattering of electrons are calculated in the Born-Ochkur approximation for 3p-3d and 3d-3d transitions in transition-metal systems, and for 4d-4f and 4f-4f transitions in rare earths. The energy dependence of the spin polarization of 3p-3d and 4d-4f losses in reflection electron-energy-loss spectroscopy from ferromagnetic surfaces involves a balance of small-angle spin-dependent inelastic processes accompanied by a high-angle elastic scattering, and large-angle spin-flip exchange scattering without the need for elastic scattering. Both 3d-3d excitations, e.g., in transition-metal compounds, and 4f-4f excitations in rare earths involve spin-flip transitions whose scattering amplitudes g fall off with momentum transfer q such that the full width at half maximum q1/2 (in a.u.) is given by q1/2?rnl??2, where ?rnl? is the expectation value of r for the 3d or 4f electron. The angular width of the spin-flip differential cross section is then much greater than for dipole transitions, a pattern that helps to account for how these intra-atomic transitions compete with dipole processes for primary energies in excess of 100 eV.

S. J. Porter; J. A. D. Matthew; R. J. Leggott

1994-07-15T23:59:59.000Z

214

EARTH ABUNDANT MATERIALS FOR HIGH EFFICIENCY HETEROJUNCTION THIN FILM SOLAR CELLS  

E-Print Network [OSTI]

EARTH ABUNDANT MATERIALS FOR HIGH EFFICIENCY HETEROJUNCTION THIN FILM SOLAR CELLS Yun Seog Lee 1; * Corresponding author: buonassisi@mit.edu; ABSTRACT We investigate earth abundant materials for thin- film solar cuprous oxide (Cu2O) as a prototype candidate for investigation as an absorber layer in thin film solar

Ceder, Gerbrand

215

Ideas for Transatlantic Cooperation on Critical Materials,Chairs...  

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

nCriticalMaterials.pptx More Documents & Publications Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials for a Clean Energy Future Renzo Tomellini, EC...

216

CMI hosts EU, Japan discuss global critical materials strategy...  

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

CMI hosts EU, Japan discuss global critical materials strategy Insider Finding ways to ensure the planet's supply of rare earths and other materials necessary for clean energy...

217

Prebiotic materials from on and off the early Earth  

Science Journals Connector (OSTI)

...Earth by interplanetary dust. Adv. Space Res. 33, 57-66. doi:10...Publishing Co. (Astrophysics and Space Science Library. Volume 134), pp. 819. Holm...organics in the early Solar system. Space Sci. Rev. 90, 275-288. doi...

2006-01-01T23:59:59.000Z

218

Model of thermally activated magnetization reversal in thin films of amorphous rare-earth-transition-metal alloys  

Science Journals Connector (OSTI)

Monte Carlo simulations on a two-dimensional lattice of magnetic dipoles have been performed to investigate the magnetic reversal by thermal activation in rare-earth-transition-metal (RE-TM) alloys. Three mechanisms of magnetization reversal were observed: nucleation dominated growth, nucleation followed by the growth of magnetic domains containing no seeds of unreversed magnetization, and nucleation followed by dendritic domain growth by successive branching in the motion of the domain walls. The domain structures are not fractal; however, the fractal dimension of the domain wall was found to be a good measure of the jaggedness of the domain boundary surface during the growth process. The effects of the demagnetizing field on the hysteretic and time-dependent properties of the thin films were studied and some limitations in the application of the Fatuzzo model on magneto-optic media are identified.

A. Lyberatos; J. Earl; R. W. Chantrell

1996-03-01T23:59:59.000Z

219

X-ray-absorption spectroscopy investigation of the martensitic structural transformation in the RCu (R=rare earth) series  

Science Journals Connector (OSTI)

We present an x-ray-absorption spectroscopy (XAS) investigation performed at the L1,3 edges of the rare earth Y K edge and K and L2,3 edges of copper in several R-Cu intermetallic compounds: RCu (R=Y,Gd,Tb), Y1-xTbxCu, and Y1-xTbxCuyAg1-y. XAS spectra at the different absorption edges evidence the apparition of a strong electronic perturbation in the systems after the martensitic transformation. The dynamics of the structural transformation is discussed in terms of the interplay between the modification of both d-band widening and s-d transfer pressure.

Jesús Chaboy and M. R. Ibarra

1995-08-01T23:59:59.000Z

220

A strong magneto-optical activity in rare-earth La{sup 3+} substituted M-type strontium ferrites  

SciTech Connect (OSTI)

M-type strontium ferrites with substitution of Sr{sup 2+} by rare-earth La{sup 3+} were prepared by conventional ceramic technology. The structure, magnetic properties, and magneto-optical Kerr activity of Sr{sub 1-x}La{sub x}Fe{sub 12}O{sub 19} (x = 0, 0.05, 0.10, 0.15, 0.20) were investigated by x-ray diffraction (XRD), vibrating sample magnetometer (VSM), and magneto-optical ellipsometry, respectively. X-ray diffraction showed that the samples sintered at 1290 deg. C for 3 h were single M-type hexagonal ferrites. The magnetic properties were remarkably changed due to the valence change of Fe ions induced by the substitution of La ions. Most significantly, an important magneto-optical activity was induced in the La{sup 3+} substituted M-type strontium ferrites around 3 eV.

Hu Feng; Liu Xiansong; Zhu Deru [Engineering Technology Research Center of Magnetic Materials, Anhui Province, School of Physics and Materials Science, Anhui University, Hefei 230039 (China); Fernandez-Garcia, Lucia; Suarez, Marta; Luis Menendez, Jose [Centro de Investigacion en Nanomateriales y Nanotecnologia (CINN), Consejo Superior de Investigaciones Cientificas (CSIC) - Universidad de Oviedo - UO - Principado de Asturias, Parque Tecnologico de Asturias, 33428 Llanera, Asturias (Spain)

2011-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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

Fundamental and Magnetic-Hardening Studies of Rare-Earth and Nanocomposite Magnets  

SciTech Connect (OSTI)

In this project we study new nanocrystalline and nanocomposite structures that have high potential for permanent-magnet development. These materials, which can be synthesized to have either very high or intermediate coercivities, have many applications in electric power, transportation, and information-storage industries. There is great interest in further development of understanding and application of these materials.

Sellmyer, David J.

2003-12-22T23:59:59.000Z

223

Effect of Composition and Heat Treatment on MnBi Magnetic Materials...  

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

Abstract: The metallic compound MnBi is a promising rare-earth-free permanent magnet material. Compare to other rare-earth-free candidates, MnBi stands out for its high...

224

Prebiotic materials from on and off the early Earth  

Science Journals Connector (OSTI)

...IDP (interplanetary dust particle)| 1. Introduction Following...and formed the heaven(and a god emerges here) In the meantime...separation of Earth and heaven (by a god) and the separation out of...at the per cent level. These particles can contain over 90vol% of...

2006-01-01T23:59:59.000Z

225

2011 Critical Materials Strategy | Department of Energy  

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

rare earth metals and other key materials play in clean energy technologies such as wind turbines, electric vehicles, solar cells and energy-efficient lighting. The report found...

226

News about CMI Partners | Critical Materials Institute  

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

mining: Scientists extract rare earth materials from consumer products, March 7, 2013 UCDavis: Navrotsky Participates in DOE-funded Research Project, Led by Ames Lab,...

227

Growth and microstructure of MTG REBa2Cu3O7/RE?2BaCuO5 with heavy rare earth elements  

Science Journals Connector (OSTI)

New melt textured REBa2Cu3O7/RE?2BaCuO5 composites, have been obtained by top seeding melt-texturing growth. Two different starting mixtures of \\{REBa2Cu3O7\\} superconducting powders and insulating \\{Y2BaCuO5\\} phase were used. On one hand RE is a natural mixture of heavy rare earth elements (Y, Yb, Lu, Er, Dy, Tm, Ho) extracted from the Brazilian mineral “Xenotime”, and on the other hand, RE is thulium. In both cases melt textured REBa2Cu3O7/RE?2BaCuO5 composites have been obtained where RE and RE? are different mixtures of heavy rare earth/yttrium and Tm/yttrium. The composition analysis shows different areas within the RE?2BaCuO5 as a consequence of an inhomogeneous RE distribution, due to the differential solubility of each rare earth in the high temperature semisolid state. During the crystallization process a profound inversion of the rare earth composition between the superconducting matrix and the insulating precipitates occurs. Yttrium is selectively located in the 123 matrix and RE in the 211 particles. Heavy RE ions can substitute yttrium in MTG REBCO without degradation of the superconducting properties. A model for the crystallization process is proposed.

A.E. Carrillo; P. Rodr??guez Jr.; T. Puig; A. Palau; X. Obradors; H. Zheng; U. Welp; L. Chen; B.W. Veal; H. Claus; G.W. Crabtree

2002-01-01T23:59:59.000Z

228

Rare-earth neutral metal injection into an electron beam ion trap plasma  

SciTech Connect (OSTI)

We have designed and implemented a neutral metal vapor injector on the SuperEBIT high-energy electron beam ion trap at the Lawrence Livermore National Laboratory. A horizontally directed vapor of a europium metal is created using a thermal evaporation technique. The metal vapor is then spatially collimated prior to injection into the trap. The source's form and quantity constraints are significantly reduced making plasmas out of metal with vapor pressures ?10{sup ?7} Torr at ?1000?°C more obtainable. A long pulsed or constant feed metal vapor injection method adds new flexibility by varying the timing of injection and rate of material being introduced into the trap.

Magee, E. W., E-mail: magee1@llnl.gov; Beiersdorfer, P.; Brown, G. V. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Hell, N. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Dr. Remeis-Sternwarte and ECAP, Universität Erlangen-Nürnberg, 96049 Bamberg (Germany)

2014-11-15T23:59:59.000Z

229

Earth melter and method of disposing of feed materials  

SciTech Connect (OSTI)

An apparatus, and method of operating the apparatus, wherein a feed material is converted into a glassified condition for subsequent use or disposal. The apparatus is particularly useful for disposal of hazardous or noxious waste materials which are otherwise either difficult or expensive to dispose of. The apparatus is preferably constructed by excavating a melt zone in a quantity of soil or rock, and lining the melt zone with a back fill material if refractory properties are needed. The feed material is fed into the melt zone and, preferably, combusted to an ash, whereupon the heat of combustion is used to melt the ash to a molten condition. Electrodes may be used to maintain the molten feed material in a molten condition, and to maintain homogeneity of the molten materials.

Chapman, Christopher C. (Richland, WA)

1994-01-01T23:59:59.000Z

230

Local structure around rare-earth ions in B{sub 2}O{sub 3} glass at high pressure  

SciTech Connect (OSTI)

Melt quenching of B{sub 2}O{sub 3} with less than 25 mol. % rare-earth oxide (RE{sub 2}O{sub 3}) at ambient pressure results in a milky white glass because of liquid-liquid phase separation into B{sub 2}O{sub 3} and RE{sub 2}O{sub 3}{center_dot}3B{sub 2}O phases. In contrast, we have found that melt quenching under GPa-order pressure realizes a transparent RE-doped B{sub 2}O{sub 3} glass. This study investigates the local structure around the RE ions in the B{sub 2}O{sub 3} glass prepared at 3 GPa using optical measurements and electron-spin-echo envelope modulation spectroscopy. It is shown that the RE-rich microparticles disappear and the RE ions are isolated from each other in a highly symmetric crystal field formed by triangular and tetrahedral boron units. This result is consistent with that extrapolated from the data for RE-doped sodium borate glasses.

Funabiki, Fuji [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan)] [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Matsuishi, Satoru [Research Center for Strategic Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan)] [Research Center for Strategic Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Hosono, Hideo [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan) [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Research Center for Strategic Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan)

2013-06-14T23:59:59.000Z

231

NREL Highlights SCIENCE Use of Earth-abundant materials in solar absorber films  

E-Print Network [OSTI]

NREL Highlights SCIENCE Use of Earth-abundant materials in solar absorber films is critical of these materials could open new opportunities for introducing thin-film solar technologies that combine both low near the FeS2 thin-film surfaces and grain boundaries that limit its open-circuit voltage, rather than

232

Earth  

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

Enthusiastic employees: sustaining the Earth January 30, 2014 Green Teams work hard to make sustainable choices at home, at work The Lab has made many energy sustainable...

233

Earth  

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

hydrological controls on carbon cycling in flood plain ecosystems into Earth System Models. - 5814 Nathan McDowell measures photosynthesis at the SUrvival MOrtality...

234

Rare Earth Elements:  

Science Journals Connector (OSTI)

...aegirine, magnetite and hematite; and (3) a massive central iron oxide facies containing 3 wt% REE2O3 (Chao et al. 1992...for several bivalent metal ions and cerium(III) with the acetylacetonate ion. Journal of Physical Chemistry 59: 235-237 Lehmann...

Anthony E. Williams-Jones; Artashes A. Migdisov; Iain M. Samson

235

Rare Earth Elements:  

Science Journals Connector (OSTI)

...start-up and processing costs because the need...way to electrical lighting in the 1930s, about...glaucoma, and other medical applications. To...energy-efficient fluorescent lighting (Gibson and Parkinson...come at such a high cost to the environment...

Anton R. Chakhmouradian; Frances Wall

236

IUPAC-NIST Solubility Data Series. 100. Rare Earth Metal Fluorides in Water and Aqueous Systems. Part 1. Scandium Group (Sc, Y, La)  

SciTech Connect (OSTI)

This work presents an assessment of solubility data for rare earth metal fluorides (generally of trivalent metals and of CeF{sub 4}) in water and in aqueous ternary systems. Compilations of all available experimental data are introduced for each rare earth metal fluoride with a corresponding critical evaluation. Every such evaluation contains a collection of all solubility results in water, a selection of suggested solubility data, and a brief discussion of the multicomponent systems. Because the ternary systems were seldom studied more than once, no critical evaluations of such data were possible. Only simple fluorides (no complexes or binary salts) are treated as the input substances in this report. The literature has been covered through the end of 2013.

Mioduski, Tomasz [Institute of Nuclear Chemistry and Technology, 03195 Warsaw (Poland); Gumi?ski, Cezary, E-mail: cegie@chem.uw.edu.pl [Department of Chemistry, University of Warsaw, 02093 Warsaw (Poland); Zeng, Dewen, E-mail: dewen-zeng@hotmail.com [College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha (China)

2014-03-15T23:59:59.000Z

237

The interplay of long-range magnetic order and single-ion anisotropy in rare earth nickel germanides  

SciTech Connect (OSTI)

This dissertation is concerned with the interplay of long-range order and anisotropy in the tetragonal RNi{sub 2}Ge{sub 2} (R = rare earth) family of compounds. Microscopic magnetic structures were studied using both neutron and x-ray resonant exchange scattering (XRES) techniques. The magnetic structures of Tb, Dy, Eu and Gd members have been determined using high-quality single-crystal samples. This work has correlated a strong Fermi surface nesting to the magnetic ordering in the RNi{sub 2}Ge{sub 2} compounds. Generalized susceptibility, {chi}{sub 0}(q), calculations found nesting to be responsible for both incommensurate ordering wave vector in GdNi{sub 2}Ge{sub 2}, and the commensurate structure in EuNi{sub 2}Ge{sub 2}. A continuous transition from incommensurate to commensurate magnetic structures via band filling is predicted. The surprisingly higher T{sub N} in EuNi{sub 2}Ge{sub 2} than that in GdNi{sub 2}Ge{sub 2} is also explained. Next, all the metamagnetic phases in TbNi{sub 2}Ge{sub 2} with an applied field along the c axis have been characterized with neutron diffraction measurements. A mixed phase model for the first metamagnetic structure consisting of fully-saturated as well as reduced-moment Tb ions is presented. The moment reduction may be due to moment instability which is possible if the exchange is comparable to the low-lying CEF level splitting and the ground state is a singlet. In such a case, certain Tb sites may experience a local field below the critical value needed to reach saturation.

Islam, Z.

1999-05-10T23:59:59.000Z

238

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

239

Application of the Kerman-Klein Method to the Solution of a Spherical Shell Model for a Deformed Rare-Earth Nucleus  

Science Journals Connector (OSTI)

Put forward more than three decades ago as an alternative to conventional shell-model calculations, the Kerman-Klein method has proved feasible previously only when applied to unrealistically small configuration spaces or when phenomenological simplifications have been superposed. Starting from a spherical shell-model Hamiltonian, we describe a fully microscopic calculation, free of the above limitations, of the properties of the ground-state band of a typical deformed rare-earth nucleus, 158Gd.

Pavlos Protopapas and Abraham Klein

1997-06-09T23:59:59.000Z

240

Iver Anderson, Division of Materials Sciences and Engineering...  

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

and Engineering, The Ames Laboratory, Current and Future Direction in Processing Rare Earth Alloys for Clean Energy Applications Iver Anderson, Division of Materials Sciences and...

Note: This page contains sample records for the topic "rare earth materials" 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

Alternative High-Performance Motors with Non-Rare Earth Materials  

Broader source: Energy.gov [DOE]

2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

242

Electrochemical cell with negative active material based on an alkali or alkaline earth metal  

SciTech Connect (OSTI)

In an electrochemical cell the negative active material is an alkali or alkaline earth metal, such as lithium, and the electrolyte comprises a solute and at least one solvent selected from the liquid oxyhalides and which serves also as the positive active material. The electrolyte further comprises a mineral substance the effect of which is to significantly reduce the voltage rise delay of the cell.

Vallin, D.; Chenebault, P.; Grassien, J.-V.; Kerouanton, A.

1985-10-15T23:59:59.000Z

243

Materials Preparation Center | Ames Laboratory  

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

Materials Preparation Center Materials Preparation Center Materials Preparation Center The Materials Preparation Center (MPC) is a U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences & Engineering specialized research center located at the Ames Laboratory. MPC operations are primarily funded by the Materials Discovery, Design, & Synthesis team's Synthesis & Processing Science core research activity. MPC is recognized throughout the worldwide research community for its unique capabilities in purification, preparation, and characterization of: Rare earth metals [learn about rare earths] Single crystal growth Metal Powders/Atomization Alkaline-earth metals [learn more, wikipedia] External Link Icon Refractory metal [learn more, wikipedia] External Link Icon

244

Observation of coherent population transfer in a four-level tripod system with a rare-earth-metal-ion-doped crystal  

Science Journals Connector (OSTI)

Coherent population transfer in a laser-driven four-level system in a tripod configuration is experimentally investigated with a rare-earth-metal-ion-doped crystal (Pr3+:Y2SiO5). The population transfers observed here indicate that a main process inducing them is not optical pumping, which is an incoherent process inducing population transfer. Moreover, numerical simulation, which well reproduces the experimental results, also shows that the process inducing the observed population transfers is similar to stimulated Raman adiabatic passage (STIRAP) in the sense that this process possesses characteristic features of STIRAP.

Hayato Goto and Kouichi Ichimura

2007-03-15T23:59:59.000Z

245

Ground-state properties of rare-earth nuclei in the relativistic Hartree-Bogoliubov model with density-dependent meson-nucleon couplings  

Science Journals Connector (OSTI)

The relativistic mean-field effective interaction with density-dependent meson-nucleon couplings DD-ME1 is tested in the calculation of deformed nuclei. Ground-state properties of six isotopic chains (60?Z?70) in the region of rare-earth nuclei are calculated by using the relativistic Hartree-Bogoliubov (RHB) model with the DD-ME1 mean-field interaction, and with the Gogny D1S force for the pairing interaction. Results of fully self-consistent RHB calculations for the total binding energies, charge isotope shifts, and quadrupole deformation parameters are compared with the available empirical data.

T. Nikši?; D. Vretenar; G. A. Lalazissis; P. Ring

2004-04-21T23:59:59.000Z

246

Critical Materials Institute List of Projects | Critical Materials...  

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

for Lithium Extraction 1.1.3 Herbst, Scott INL Enhanced Separation of Adjacent Rare Earth Elements 1.2.1 Mishra, Brajendra CSM Conversion to Metal, Alloys, and Materials 1.2.2...

247

X-ray absorption and resonant x-ray emission spectra by electric quadrupole excitation in light rare-earth systems  

Science Journals Connector (OSTI)

We have made precise theoretical calculations for both 2p3/2?4f x-ray absorption spectra and 3d?2p3/2 resonant x-ray emission spectra involving electric quadrupole excitations at the L3 edge of light rare-earth elements from La to Eu. It is shown that the energy separation of a double-peak structure observed by x-ray absorption spectroscopy (XAS) does not agree with that determined from resonant x-ray emission spectroscopy (RXES), in contrast to recent experimental results by Bartolomé et al. The reason for this difference is that the energy separation in XAS is determined by the 4f-4f interaction only, while that in RXES is determined by both 4f-4f and 3d-4f interactions.

M. Nakazawa; K. Fukui; H. Ogasawara; A. Kotani; C. F. Hague

2002-09-26T23:59:59.000Z

248

Ground States of the Ising Model on the Shastry-Sutherland Lattice and the Origin of the Fractional Magnetization Plateaus in Rare-Earth-Metal Tetraborides  

Science Journals Connector (OSTI)

A complete and exact solution of the ground-state problem for the Ising model on the Shastry-Sutherland lattice in an applied magnetic field is found. The magnetization plateau at one third of the saturation value is shown to be the only possible fractional plateau in this model. However, stripe magnetic structures with 1/2 and 1/n (n>3) magnetization, observed in the rare-earth-metal tetraborides RB4, occur at the boundaries of the three-dimensional regions of the ground-state phase diagram. These structures give rise to new magnetization plateaus if interactions of longer range are taken into account. For instance, an additional third-neighbor interaction is shown to produce a 1/2 plateau. The results obtained significantly refine the understanding of the magnetization process in RB4 compounds, especially in TmB4 and ErB4, which are strong Ising magnets.

Yu. I. Dublenych

2012-10-16T23:59:59.000Z

249

A new N-hydroxyethyliminodiacetic acid modified core–shell silica phase for chelation ion chromatography of alkaline earth, transition and rare earth elements  

Science Journals Connector (OSTI)

Abstract Bare core–shell silica (1.7 ?m) has been modified with iminodiacetic acid functional groups via standard silane chemistry, forming a new N-hydroxyethyliminodiacetic acid (HEIDA) functionalised core–shell stationary phase. The column was applied in high-performance chelation ion chromatography and evaluated for the retention of alkaline earth, transition and heavy metal cations. The influence of nitric acid eluent concentration, addition of complexing agent dipicolinic acid, eluent pH and column temperature on the column performance was investigated. The efficiencies obtained for transition and heavy metal cations (and resultant separations) were comparable or better than those previously obtained for alternative fully porous silica based chelation stationary phases, and a similarly modified monolithic silica column, ranging from ?15 to 56 ?m HETP. Increasing the ionic strength of the eluent with the addition of KNO3 (0.75 M) and increasing the column temperature (70 °C) facilitated the isocratic separation of a mixture of 14 lanthanides and yttrium in under 12 min, with HETP averaging 18 ?m (7 ?m for Ce(III))

Nicola McGillicuddy; Ekaterina P. Nesterenko; Pavel N. Nesterenko; Elaine M. Stack; Jesse O. Omamogho; Jeremy D. Glennon; Brett Paull

2013-01-01T23:59:59.000Z

250

Chromium (III), Titanium (III), and Vanadium (IV) sensitization of rare earth complexes for luminescent solar concentrator applications  

E-Print Network [OSTI]

High optical concentrations without excess heating in a stationary system can be achieved with a luminescent solar concentrator (LSC). Neodymium (Nd) and ytterbium (Yb) are excellent infrared LSC materials: inexpensive, ...

Thompson, Nicholas John

2011-01-01T23:59:59.000Z

251

Sun-Earth Connections: Instructional Materials for Scientists, pp. 1-14, UCAR Education and Outreach (unpublished)  

E-Print Network [OSTI]

Sun-Earth Connections: Instructional Materials for Scientists, pp. 1-14, UCAR Education and Outreach (unpublished) Teaching Time: One 45-minute period Materials for the Facilitator · Dynamic Sun PowerPoint (available from UCAR Education and Outreach) · Transparency of Two Views of the Sun

Mojzsis, Stephen J.

252

EARTH SCIENCES DIVISION. ANNUAL REPORT 1977.  

E-Print Network [OSTI]

8erkeley Laboratory (LBL), the Earth Sciences Division, wasactivation analysis: rare earth element distribution (D)can be used to generate earth- quake records for use in

Witherspoon, P.A.

2011-01-01T23:59:59.000Z

253

Critical Materials Hub  

Broader source: Energy.gov [DOE]

Critical materials, including some rare earth elements that possess unique magnetic, catalytic, and luminescent properties, are key resources needed to manufacture products for the clean energy economy. These materials are so critical to the technologies that enable wind turbines, solar panels, electric vehicles, and energy-efficient lighting that DOE's 2010 and 2011 Critical Materials Strategy reported that supply challenges for five rare earth metals—dysprosium, neodymium, terbium, europium, and yttrium—could affect clean energy technology deployment in the coming years.1, 2

254

JOURNAL DE PHYSIQUE Colloque C5, supplkment au no 5, Tome 40, Mai 1979, page C5-63 Heat capacity of rare earth metals near the melting point and the vacancy  

E-Print Network [OSTI]

of rare earth metals near the melting point and the vacancy mechanism of melting T. Gorecki (*) Max. -The vacancy mechanism of the melting process is utilized as a starting point for deriving the formula point and changes of the same properties of metals due to the creation of vacancies has been

Paris-Sud XI, Université de

255

Iowa lab gets critical materials research center  

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

hub is set to be the largest R&D effort toward alleviating the global shortage of rare earth metals. T he newly created Critical Materials Institute at the Ames Laboratory has the...

256

CMI Grand Challenge Problems | Critical Materials Institute  

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

are among the most difficult elements to process, and the hardest to do without. Rare earth elements rank at the top of all lists of critical materials today, and the difficulty...

257

Monte Carlo study of two-dimensional Ising dipolar antiferromagnets as a model for rare-earth ordering in the R-Ba-Cu-O compounds (R=rare earth)  

Science Journals Connector (OSTI)

The two-dimensional Ising model with dipolar interactions is studied using Monte Carlo simulation. In the case of a pure dipolar interaction, estimates are obtained for the reduced transition temperature, ?n=2a3kBTn/?eff2 for two particular spin alignments in which the spins are aligned parallel to and perpendicular to the plane, respectively. A comparison with measurements made on RBa2Cu3O7-? (R=Nd,Dy, and Er) and RBa2Cu4O8 (R=Dy and Er) show that the calculated Ne´el temperature falls consistently below that observed experimentally. The model is generalized to include an isotropic intraplanar nearest-neighbor exchange interaction and the Ne´el temperature calculated as a function of the strength of the exchange coupling for configurations in which the spins are aligned perpendicular to the plane. From this estimates of the exchange coupling are obtained for some of these materials. The results obtained from these calculations confirm that the long-range character of the dipolar interaction does not affect the universality class of the two-dimensional Ising antiferromagnet. Extensions of the present analysis are discussed.

A. B. MacIsaac; J. P. Whitehead; K. De’Bell; K. Sowmya Narayanan

1992-09-01T23:59:59.000Z

258

Critical Materials Strategy Summary  

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

diplomacy. As the nation's leading funder of research on the physical sciences, DOE's capabilities with respect to materials research are substantial. Topics identified for priority research attention include rare earth substitutes in magnets, batteries, photovoltaic films and phosphors; environmentally sound mining and materials processing; and recycling. The eight programs and policies address risks, con- straints and opportunities across the supply chain,

259

Critical Materials Strategy Summary  

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

diplomacy. As the nation's leading funder of research on the physical sciences, DOE's capabilities with respect to materials research are substantial. Topics identified for priority research attention include rare earth substitutes in magnets, batteries, photovoltaic films and phosphors; environmentally sound mining and materials processing; and recycling. The eight programs and policies address risks, con- straints and opportunities across the supply chain,

260

Synthesis of main group, rare-earth, and d{sup 0} metal complexes containing beta-hydrogen  

SciTech Connect (OSTI)

A series of organometallic compounds containing the tris(dimethylsilyl)methyl ligand are described. The potassium carbanions KC(SiHMe{sub 2}){sub 3} and KC(SiHMe{sub 2}){sub 3}TMEDA are synthesized by deprotonation of the hydrocarbon HC(SiHMe{sub 2}){sub 3} with potassium benzyl. KC(SiHMe{sub 2}){sub 3}TMEDA crystallizes as a dimer with two types of three-center-two-electron KH- Si interactions. Homoleptic Ln(III) tris(silylalkyl) complexes containing ?-SiH groups M{C(SiHMe{sub 2}){sub 3}}{sub 3} (Ln = Y, Lu, La) are synthesized from salt elimination of the corresponding lanthanide halide and 3 equiv. of KC(SiHMe{sub 2}){sub 3}. The related reactions with Sc yield bis(silylalkyl) ate-complexes containing either LiCl or KCl. The divalent calcium and ytterbium compounds M{C(SiHMe{sub 2}){sub 3}}{sub 2}L (M = Ca, Yb; L = THF{sub 2} or TMEDA) are prepared from MI{sub 2} and 2 equiv of KC(SiHMe{sub 2}){sub 3}. The compounds M{C(SiHMe{sub 2}){sub 3}}{sub 2}L (M = Ca, Yb; L = THF{sub 2} or TMEDA) and La{C(SiHMe{sub 2}){sub 3}}{sub 3} react with 1 equiv of B(C{sub 6}F{sub 5}){sub 3} to give 1,3- disilacyclobutane {Me2Si-C(SiHMe2)2}2 and MC(SiHMe2)3HB(C6F5)3L, and La{C(SiHMe{sub 2}){sub 3}}{sub 2}HB(C{sub 6}F{sub 5}){sub 3}, respectively. The corresponding reactions of Ln{C(SiHMe{sub 2}){sub 3}}{sub 3} (Ln = Y, Lu) give the ?-SiH abstraction product [{(Me{sub 2}HSi){sub 3}C}{sub 2}LnC(SiHMe{sub 2}){sub 2}SiMe{sub 2}][HB(C{sub 6}F{sub 5}){sub 3}] (Ln = Y, Lu), but the silene remains associated with the Y or Lu center. The abstraction reactions of M{C(SiHMe{sub 2}){sub 3}}{sub 2}L (M = Ca, Yb; L = THF{sub 2 }or TMEDA) and Ln{C(SiHMe{sub 2}){sub 3}}{sub 3} (Ln = Y, Lu, La) and 2 equiv of B(C{sub 6}F{sub 5}){sub 3} give the expected dicationic M{HB(C{sub 6}F{sub 5}){sub 3}}{sub 2}L (M = Ca, Yb; L = THF{sub 2} or TMEDA) and dicationic mono(silylalkyl) LnC(SiHMe{sub 2}){sub 3}{HB(C{sub 6}F{sub 5}){sub 3}}{sub 2} (Ln = Y, Lu, La), respectively. Salt metathesis reactions of Cp{sub 2}(NR{sub 2})ZrX (X = Cl, I, OTf; R = t-Bu, SiHMe{sub 2}) and lithium hydrosilazide ultimately afford hydride products Cp{sub 2}(NR{sub 2})ZrH that suggest unusual ?-hydrogen elimination processes. A likely intermediate in one of these reactions, Cp{sub 2}Zr[N(SiHMe{sub 2})t-Bu][N(SiHMe{sub 2}){sub 2}], is isolated under controlled synthetic conditions. Addition of alkali metal salts to this zirconium hydrosilazide compound produces the corresponding zirconium hydride. However as conditions are varied, a number of other pathways are also accessible, including C-H/Si-H dehydrocoupling, ?-abstraction of a CH, and ?-abstraction of a SiH. Our observations suggest that the conversion of (hydrosilazido)zirconocene to zirconium hydride does not follow the classical four-center ?- elimination mechanism. Elimination and abstraction reactions dominate the chemistry of ligands containing ?- hydrogen. In contrast, Cp{sub 2}Zr{N(SiHMe{sub 2}){sub 2}}H and Cp{sub 2}Zr{N(SiHMe{sub 2}){sub 2}}Me undergo selective ?-CH bond activation to yield the azasilazirconacycle Cp{sub 2Zr}{?{sup 2}-N(SiHMe{sub 2})SiHMeCH{sub 2}}, even though there are reactive ?-hydrogen available for abstraction. The ?-SiH groups in metallacycle provide access to new pathways for sixteen-electron zirconium alkyl compounds, in which Cp{sub 2}Zr{?{sup 2}-N(SiHMe{sub 2})SiHMeCH{sub 2}} undergoes a rare ?-bond metathesis reaction with ethylene. The resulting vinyl intermediate undergoes ?-hydrogen abstraction to reform ethylene and a silanimine zirconium species that reacts with ethylene to give a metallacyclopentane as the isolated product. The pendent ?-SiH in metallocycle also reacts with paraformaldehyde through an uncatalyzed hydrosilylation to form an exocyclic methoxysilyl moiety, while the zirconium-carbon bond in metallocycle is surprisingly inert toward formaldehyde. Still, the Zr-C moiety in metallocycle is available for chemistry, and it interacts with the carbon monoxide and strong electrophile B(C{sub 6}F{sub 5}){sub 3} to provide Cp{sub 2}Zr[?{sup 2}- OC(=CH{sub 2})SiMeHN(SiHMe

Yan, Ka King [Ames Laboratory

2013-05-02T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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

Distribution of rare earth elements in marine sediments from the Strait of Sicily (western Mediterranean Sea): Evidence of phosphogypsum waste contamination  

Science Journals Connector (OSTI)

Concentrations of rare earth elements (REE), Y, Th and Sc were recently determined in marine sediments collected using a box corer along two onshore–offshore transects located in the Strait of Sicily (Mediterranean Sea). The REE + Y were enriched in offshore fine-grained sediments where clay minerals are abundant, whereas the REE + Y contents were lower in onshore coarse-grained sediments with high carbonate fractions. Considering this distribution trend, the onshore sediments in front of the southwestern Sicilian coast represent an anomaly with high REE + Y concentrations (mean value 163.4 ?g g?1) associated to high Th concentrations (mean value 7.9 ?g g?1). Plot of shale-normalized REE + Y data of these coastal sediments showed Middle REE enrichments relative to Light REE and Heavy REE, manifested by a convexity around Sm–Gd–Eu elements. These anomalies in the fractionation patterns of the coastal sediments were attributed to phosphogypsum-contaminated effluents from an industrial plant, located in the southern Sicilian coast.

G. Tranchida; E. Oliveri; M. Angelone; A. Bellanca; P. Censi; M. D’Elia; R. Neri; F. Placenti; M. Sprovieri; S. Mazzola

2011-01-01T23:59:59.000Z

262

Anomalies in the Young modulus at structural phase transitions in rare-earth cobaltites RBaCo{sub 4}O{sub 7} (R = Y, Tm-Lu)  

SciTech Connect (OSTI)

The elastic properties of rare-earth cobaltites RBaCo{sub 4}O{sub 7} (R = Y, Tm-Lu) have been experimentally studied in the temperature range of 80-300 K. The strong softening of the Young modulus {Delta}E(T)/E{sub 0} Almost-Equal-To -(0.1-0.2) of cobaltites with Lu and Yb ions has been revealed, which is due to the instability of the crystal structure upon cooling and is accompanied by an inverse jump at the second-order structural phase transition. The softening of the Young modulus and the jump at the phase transition decrease by an order of magnitude and the transition temperature T{sub s} and hysteresis {Delta}T{sub s} increase from a compound with Lu to that with Tm. A large softening of the Young modulus at the structural transition in Lu- and Yb cobaltites indicates that the corresponding elastic constant goes to zero, whereas this constant in Tm cobaltite is not a 'soft' mode of the phase transition. It has been found that the structural phase transition in Lu- and Yb cobaltites is accompanied by a large absorption maximum at the phase transition point and an additional maximum in the low-temperature phase and absorption anomalies in Tm cobaltite is an order of magnitude smaller.

Kazei, Z. A., E-mail: kazei@plms.phys.msu.ru; Snegirev, V. V.; Andreenko, A. S. [Moscow State University (Russian Federation); Kozeeva, L. P. [Russian Academy of Sciences, Nikolaev Institute of Inorganic Chemistry, Siberian Branch (Russian Federation)

2011-08-15T23:59:59.000Z

263

Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897. New classification of the Nd III spectrum  

E-Print Network [OSTI]

We have obtained a UVES spectrum of a slowly rotating strongly magnetic Ap star, HD 144897, that exhibits very large overabundances of rare-earth elements. Here we present a detailed spectral analysis of this object, also taking into account effects of non-uniform vertical distribution (stratification) of chemical elements. We have determined the photospheric abundances of 40 ions. For seven elements (Mg, Si, Ca, Ti, Cr, Mn, Fe), we have obtained a stratification model that allow us to produce a satisfactory fit to the observed profiles of spectral lines of various strength. REEs abundances, that for the first time in the literature have been determined from the lines of the first and second ions, have been found typically four dex larger than solar abundances. Our analysis of REE spectral lines provide a strong support to the laboratory line classification and determination of the atomic parameters. The only remarkable exception is Nd III, for which spectral synthesis was found to be inconsistent with the ob...

Ryabchikova, T A; Kochukhov, O; Ryabtsov, A V

2006-01-01T23:59:59.000Z

264

Earth’s magnetism  

Science Journals Connector (OSTI)

Earth’s magnetism, geomagnetism, terrestrial magnetism [The magnetism of the Earth] ? Erdmagnetismus m, Geomagnetismus

2014-08-01T23:59:59.000Z

265

2011 Critical Materials Strategy | Department of Energy  

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

1 Critical Materials Strategy 1 Critical Materials Strategy 2011 Critical Materials Strategy This report examines the role that rare earth metals and other key materials play in clean energy technologies such as wind turbines, electric vehicles, solar cells and energy-efficient lighting. The report found that several clean energy technologies use materials at risk of supply disruptions in the short term, with risks generally decreasing in the medium and long terms. Supply challenges for five rare earth metals (dysprosium, neodymium, terbium, europium and yttrium) may affect clean energy technology deployment in the years ahead. DOE_CMS2011_FINAL_Full.pdf DOE_CMS_2011_Summary.pdf More Documents & Publications 2010 Critical Materials Strategy ARPA-E Workshop on Rare Earth and Critical Materials

266

Global Lifetime Measurements of Highly-Deformed and Other Rotational Structures in the A~135 Light Rare-Earth Region: Probing the Single-Particle Motion in a Rotating Potential  

E-Print Network [OSTI]

It has been possible, using GAMMASPHERE plus Microball,to extract differential lifetime measurements free from common systematic errors for over 15 different nuclei (various isotopes of Ce, Pr, Nd, Pm, and Sm) at high spin within a single experiment. This comprehensive study establishes the effective single-particle quadrupole moments in the A~135 light rare-earth region. Detailed comparisons are made with calculations using the self-consistent cranked mean-field theory.

M. A. Riley; R. W. Laird; F. G. Kondev; D. J. Hartley; D. E. Archer; T. B. Brown; R. M. Clark; M. D evlin; P. Fallon; I. M. Hibbert; D. T. Joss; D. R. LaFosse; P. J. Nolan; N. J. O'Brien; E. S. Paul; J. Pfohl; D. G. Sarantites; R. K. Sheline; S. L. Shepherd; J. Simpson; R. Wadsworth; M. T. Matev; A. V. Afanasjev; J. Dobaczewski; G. A. Lalazissis; W. Nazarewicz; W. Satula

2001-05-15T23:59:59.000Z

267

REACT: Alternatives to Critical Materials in Magnets  

SciTech Connect (OSTI)

REACT Project: The 14 projects that comprise ARPA-E’s REACT Project, short for “Rare Earth Alternatives in Critical Technologies”, are developing cost-effective alternatives to rare earths, the naturally occurring minerals with unique magnetic properties that are used in electric vehicle (EV) motors and wind generators. The REACT projects will identify low-cost and abundant replacement materials for rare earths while encouraging existing technologies to use them more efficiently. These alternatives would facilitate the widespread use of EVs and wind power, drastically reducing the amount of greenhouse gases released into the atmosphere.

None

2012-01-01T23:59:59.000Z

268

Interplay of superconductivity, magnetism, and density waves in rare-earth tritellurides and iron-based superconducting materials  

E-Print Network [OSTI]

107 Figure IV.3: Electrical resistance R vs. temperature TRoom-temperature electrical resistance vs. applied load andanvil cell (DAC) electrical resistivity vs. temperature for

Zocco, Diego Andrés

2011-01-01T23:59:59.000Z

269

Interplay of superconductivity, magnetism, and density waves in rare-earth tritellurides and iron-based superconducting materials  

E-Print Network [OSTI]

3. Magnetism in Metals . . . . . . . . . . . . . . . . .IV Superconductivity and Magnetism in Iron-PnictideIII Superconductivity, Magnetism and Charge-Density Waves in

Zocco, Diego Andrés

2011-01-01T23:59:59.000Z

270

Ames Laboratory to Lead New Research Effort to Address Shortages in Rare  

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

Laboratory to Lead New Research Effort to Address Shortages in Laboratory to Lead New Research Effort to Address Shortages in Rare Earth and Other Critical Materials Ames Laboratory to Lead New Research Effort to Address Shortages in Rare Earth and Other Critical Materials January 9, 2013 - 12:13pm Addthis NEWS MEDIA CONTACT (202) 586-4940 WASHINGTON - The U.S. Department of Energy announced today that a team led by Ames Laboratory in Ames, Iowa, has been selected for an award of up to $120 million over five years to establish an Energy Innovation Hub that will develop solutions to the domestic shortages of rare earth metals and other materials critical for U.S. energy security. The new research center, which will be named the Critical Materials Institute (CMI), will bring together leading researchers from academia, four Department of Energy

271

Stability maps to predict anomalous ductility in B2 materials  

E-Print Network [OSTI]

While most B2 materials are brittle, a new class of B2 (rare-earth) intermetallic compounds is observed to have large ductility. We analytically derive a necessary condition for ductility (dislocation motion) involving ...

Sun, Ruoshi

272

Capturing near-Earth asteroids around Earth Zaki Hasnain n  

E-Print Network [OSTI]

metals and semiconducting elements on Earth may be supplemented or even replaced by the reserves floating propellant to transport spacecraft between space habitats, Earth, the Moon, the asteroids, and beyond. Rare-Earth Capturing near-Earth asteroids around Earth Zaki Hasnain n , Christopher A. Lamb, Shane D. Ross

Ross, Shane

273

Alkaline earth lead and tin compounds Ae2Pb, Ae2Sn, Ae=Ca,Sr,Ba, as thermoelectric materials  

SciTech Connect (OSTI)

We present a detailed theoretical study of three alkaline earth compounds Ca2Pb, Sr2Pb and Ba2Pb, which have undergone little previous study, calculating electronic band structures and Boltzmann transport and bulk moduli using density functional theory. We also study the corresponding tin compounds Ca2 Sn, Sr2 Sn and Ba2 Sn. We find that these are all narrow band gap semiconductors with an electronic structure favorable for thermoelectric performance, with substantial thermopowers for the lead compounds at temperature ranges from 300 to 800 K. For the lead compounds, we further find very low calculated bulk moduli - roughly half of the values for the lead chalcogenides, suggestive of soft phonons and hence low lattice thermal conductivity. All these facts indicate that these materials merit experimental investigation as potential high performance thermoelectrics. We find good potential for thermoelectric performance in the environmentally friendly stannide materials, particularly at high temperature.

Parker, David S [ORNL; Singh, David J [ORNL

2013-01-01T23:59:59.000Z

274

Rare earth doped TiO2-CdS and TiO2-CdS composites with improvement of photocatalytic hydrogen evolution under visible light irradiation  

Science Journals Connector (OSTI)

In this paper, we report the obtention of a series of rare earth doped composite Pt/RE/TiO2-CdS (RE=La3+, Eu3+, Er3+, Gd3+) and TiO2-CdS photocatalysts prepared by a simple mechanical mixed method. The photocatalysts properties were studied by means of ultraviolet-visible spectroscopy, photoluminiscence spectra, X-ray diffraction, transmission electron microscopy, specific surface areas and the electrochemistry method. Photocatalytic hydrogen evolution using Na2S/Na2SO3 as electron donor was investigated under visible-light (??420 nm) irradiation. The rare earth doping enhances the activities of Pt/RE/TiO2-CdS samples (with 1.0 wt% deposited Pt). Under optimum conditions, the activities of La3+, Eu3+, Er3+, Gd3+ doped composite Pt/RE/TiO2-CdS increase by 62.0%, 40.4%, 34.7% and 30.0% respectively, when compared to that of Pt/TiO2-CdS, due to the prevention of electron–hole recombination and the flat-band potential of the conduction of TiO2 shifting negatively by the doping.

Shaoqin Peng; Yahui Huang; Yuexiang Li

2013-01-01T23:59:59.000Z

275

E-Print Network 3.0 - alkaline earth cations Sample Search Results  

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

the cation (alkaline, rare earth... to the cation size. Knowing that the size of rare earth elements and alkaline cations decreases in the following... of results on tungstate...

276

E-Print Network 3.0 - alkaline earth lithium Sample Search Results  

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

the cation (alkaline, rare earth... to the cation size. Knowing that the size of rare earth elements and alkaline cations decreases in the following... of results on tungstate...

277

Derk Bol, Materials Innovation Institute M2i (Netherlands) M2i...  

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

SessionA4Bol.ppt More Documents & Publications Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials for a Clean Energy Future Vehicle Technologies...

278

EARTH SCIENCES DIVISION ANNUAL REPORT 1978  

E-Print Network [OSTI]

of electrolytes: IX, rare earth chlorides, nitrates, andU E OF AQUIFER RESPONSE TO EARTH TIDES AS A MEANS O F SLawrence Berkeley Laboratory, Earth Sciences Division, 1977.

Authors, Various

2012-01-01T23:59:59.000Z

279

NREL Explores Earth-Abundant Materials for Future Solar Cells (Fact Sheet), Innovation: The Spectrum of Clean Energy Innovation, NREL (National Renewable Energy Laboratory)  

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

Explores Earth-Abundant Explores Earth-Abundant Materials for Future Solar Cells Researchers at the National Renewable Energy Laboratory (NREL) are using a theory-driven technique-sequential cation mutation-to understand the nature and limitations of promising solar cell materials that can replace today's technologies. Finding new materials that use Earth-abundant elements and are easily manufactured is important for large-scale solar electricity deployment. The goal of the U.S. Department of Energy SunShot Initiative is to reduce the installed cost of solar energy systems by about 75% by the end of the decade. Obtaining that goal calls for photovoltaic (PV) technologies to improve in three main areas: solar-cell efficiencies, material processing costs, and scalability to the terawatt (TW), or 10

280

Earth-Abundant Materials for High-Efficiency Heterojunction Thin Film Solar Cells  

Science Journals Connector (OSTI)

We investigate materials for thin film solar cells that can meet tens of terawatts level deployment potential. As one of the candidates, cuprous oxide (Cu2O) is synthesized and...

Lee, Yun Seog; Bertoni, Mariana; Buonassisi, Tonio

Note: This page contains sample records for the topic "rare earth materials" 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.


281

Institute for Global Environmental Strategies: Discover Earth Program Materials http://www.strategies.org/index.aspx  

E-Print Network [OSTI]

Environment Interdependence of Life The Designed World Energy Sources and Use The Mathematical World Symbolic and vehicle energy consumption. q q Explain the relationship between energy consumption, energy production://www.strategies.org/index.aspx Teaching Time: In class: 3+ days At home: variable Materials · Calculator · Household energy bills

Mojzsis, Stephen J.

282

Energy Department Announces $3 Million to Lower Cost of Geothermal Energy and Boost U.S. Supply of Critical Materials  

Office of Energy Efficiency and Renewable Energy (EERE)

The Energy Department today announced $3 million for research and development to help grow U.S. low-to-moderate-temperature geothermal resources and support a domestic supply of critical materials, such as lithium carbonate and rare earth elements.

283

Crystal field study in rare-earth-doped LuInNi4 P. G. Pagliuso, J. D. Thompson, and J. L. Sarrao  

E-Print Network [OSTI]

properties resulting from the interplay among Kondo effect, crystal-field effects CFE , and the Ruderman temperature and consequently does not signifi- cantly influence the ground state.7­13 In contrast, CFE for guiding the interpretation of the low- T properties of these materials, we have performed further CFE

Martins, George

284

A Muon and Neutron Study of Multiferroic Materials  

E-Print Network [OSTI]

A Muon and Neutron Study of Multiferroic Materials Heather Joanne Lewtas University of Oxford #12;A Muon and Neutron Study of Multiferroic Materials Heather Joanne Lewtas Linacre College performed to try and identify muon stopping sites. The family of rare earth chromites have been studied

Boothroyd, Andrew

285

Synthesis and Characterization of Metal-Oxide Composite Materials for Permanent Magnetic Applications  

E-Print Network [OSTI]

supply of crucial rare-earth elements is uncertain, causingheavily on the use of rare earth elements. China, whichworld’s supply of rare-earth elements, has cut down exports

Volodchenkov, Aleksey

2012-01-01T23:59:59.000Z

286

The Critical Materials Research Alliance  

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

NOVEMBER 2012 NOVEMBER 2012 The Critical Materials Research Alliance About the Critical Materials Research Alliance The recent surge of interest in critical materials, including rare earth elements (REEs), stems from supply shortages and escalating prices of some REEs. In 2010, the United States' sole REE supplier was China-previously responsible for 97% of global REE production-but the Chinese government curtailed their export. Because REEs and other critical elements are used in renewable energy resources, energy storage, energy efficiency technologies, and national defense, a shortage in their supply impedes development of energy technologies and hinders U.S. defense industries. To address the challenges faced in revitalizing the rare earth industry, the National Energy Technology

287

New ternary rare-earth metal boride carbides R{sub 15}B{sub 4}C{sub 14} (R=Y, Gd-Lu) containing BC{sub 2} units: Crystal and electronic structures, magnetic properties  

SciTech Connect (OSTI)

The ternary rare-earth boride carbides R{sub 15}B{sub 4}C{sub 14} (R=Y, Gd-Lu) were prepared from the elements by arc-melting followed by annealing in silica tubes at 1270 K for 1 month. The crystal structures of Tb{sub 15}B{sub 4}C{sub 14} and Er{sub 15}B{sub 4}C{sub 14} were determined from single crystal X-ray diffraction data. They crystallize in a new structure type in space group P4/mnc (Tb{sub 15}B{sub 4}C{sub 14}: a=8.1251(5) A, c=15.861(1) A, Z=2, R{sub 1}=0.041 (wR{sub 2}=0.088) for 1023 reflections with I{sub o}>2{sigma}(I{sub o}); Er{sub 15}B{sub 4}C{sub 14}: a=7.932(1) A, c=15.685(2) A, Z=2, R{sub 1}=0.037 (wR{sub 2}=0.094) for 1022 reflections with I{sub o}>2{sigma}(I{sub o})). The crystal structure contains discrete carbon atoms and bent CBC units in octahedra and distorted bicapped square antiprisms, respectively. In both structures the same type of disorder exists. One R atom position needs to be refined as split atom position with a ratio 9:1 indicative of a 10% substitution of the neighboring C{sup 4-} by C{sub 2}{sup 4-}. The actual composition has then to be described as R{sub 15}B{sub 4}C{sub 14.2}. The isoelectronic substitution does not change the electron partition of R{sub 15}B{sub 4}C{sub 14} which can be written as (R{sup 3+}){sub 15}(C{sup 4-}){sub 6}(CBC{sup 5-}){sub 4{center_dot}}e{sup -}. The electronic structure was studied with the extended Hueckel method. The investigated compounds Tb{sub 15}B{sub 4}C{sub 14}, Dy{sub 15}B{sub 4}C{sub 14} and Er{sub 15}B{sub 4}C{sub 14} are hard ferromagnets with Curie temperatures T{sub C}=145, 120 and 50 K, respectively. The coercive field B{sub C}=3.15 T for Dy{sub 15}B{sub 4}C{sub 14} is quite remarkable. - Graphical abstract: The ternary rare earth boride carbides R{sub 15}B{sub 4}C{sub 14} (R=Y, Gd-Lu) were prepared from the elements by arc-melting followed by annealing in silica tubes at 1270 K for 1 month. Tb{sub 15}B{sub 4}C{sub 14} is a new member of the rare-earth metal boride carbide series in which the finite quasi-molecular CBC entities as well as isolated C atoms are embedded in the voids of the metal atom matrix. The structure of Tb{sub 15}B{sub 4}C{sub 14} contains two types of slabs: one slab contains finite bent CBC units and isolated carbon atoms whereas another is formed only from octahedral coordinated single carbon atoms. The electronic structure for the idealized composition corresponds to an electron partitioning according to (Tb{sup 3+}){sub 15}(C{sup 4-}){sub 6}(CBC{sup 5-}){sub 4{center_dot}}e{sup -} giving rise to a single electron per formula for Tb-Tb framework bonding. The magnetism of the ternary rare earth boride carbides R{sub 15}B{sub 4}C{sub 14} (R=Tb, Dy, Er) is characterized by the onset of ferromagnetic order below T<150 K.

Babizhetskyy, Volodymyr, E-mail: v.babizhetskyy@fkf.mpg.d [Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, Postfach 800665, D-70569 Stuttgart (Germany); Simon, Arndt; Mattausch, Hansjuergen [Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, Postfach 800665, D-70569 Stuttgart (Germany); Hiebl, Kurt [Arbeitsgruppe Neue Materialien, Universitaet Wien, Waehringerstrasse 42, A-1090 Wien (Austria); Zheng Chong [Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115 (United States)

2010-10-15T23:59:59.000Z

288

ORNL partners on critical materials hub | ornl.gov  

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

ORNL partners on critical materials hub ORNL partners on critical materials hub January 01, 2013 The Critical Materials Institute builds on the Department of Energy's Critical Materials Strategy report, which addresses the use of rare earths and other critical materials in clean energy components, products, and processes. December 2011. Credit: U.S. DOE. ORNL wins big as part of a team led by Ames Labora-tory, which was selected for an Energy Innovation Hub to address shortages of critical materials, including rare earth metals. The award of up to $120 million over five years for the Critical Materials Institute involves four national labs, academia, and industrial partners. ORNL will play a key role in conducting the CMI's mis-sion to eliminate materials criticality as an impediment to the commercialization of clean

289

Earth Sciences Division Research Summaries 2006-2007  

E-Print Network [OSTI]

the commencement of the Earth Sciences Division 30 yearstelling. Happy Anniversary! Earth Sciences Division ears YTritium in Engineered and Earth Materials Stefan Finsterle,

DePaolo, Donald

2008-01-01T23:59:59.000Z

290

The Use of Rare Earths in Photovoltaics  

Science Journals Connector (OSTI)

The metal-insulator semiconductor (MIS) junction used as an alternative solar cell is reviewed. The properties of the new solar cell barrier metals Sc, Y, Lu and Yb are discussed and compared with other barrie...

P. Munz; E. Bucher

1982-01-01T23:59:59.000Z

291

Mixed Conduction in Rare-Earth Phosphates  

E-Print Network [OSTI]

compressed   air,   flywheels,   biofuels,   hydropower,   and   electrochemical   energy   storage  

Ray, Hannah Leung

2012-01-01T23:59:59.000Z

292

Mixed Conduction in Rare-Earth Phosphates  

E-Print Network [OSTI]

fundamentals   of   mixed   protonic   and   electronic  the  fundamentals  of  mixed  protonic  and  electronic  better  fundamental  understanding  of  mixed  electronic  

Ray, Hannah Leung

2012-01-01T23:59:59.000Z

293

Exploring Earth-Building Technology for Liberia.  

E-Print Network [OSTI]

?? This paper discusses earth as a building material and the extent to which earth building technology has evolved over the years. In particular it… (more)

Mayon, Isaac Dompo

2009-01-01T23:59:59.000Z

294

Department of Energy Releases its 2011 Critical Materials Strategy |  

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

its 2011 Critical Materials Strategy its 2011 Critical Materials Strategy Department of Energy Releases its 2011 Critical Materials Strategy December 22, 2011 - 12:33pm Addthis Washington, D.C. - The U.S. Department of Energy (DOE) today released the 2011 Critical Materials Strategy. The report examines the role that rare earth metals and other key materials play in clean energy technologies such as wind turbines, electric vehicles, solar cells and energy-efficient lighting. The report found that several clean energy technologies use materials at risk of supply disruptions in the short term, with risks generally decreasing in the medium and long terms. Supply challenges for five rare earth metals (dysprosium, neodymium, terbium, europium and yttrium) may affect clean energy technology deployment in the years ahead.

295

Department of Energy Releases its 2011 Critical Materials Strategy |  

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

Department of Energy Releases its 2011 Critical Materials Strategy Department of Energy Releases its 2011 Critical Materials Strategy Department of Energy Releases its 2011 Critical Materials Strategy December 22, 2011 - 12:33pm Addthis Washington, D.C. - The U.S. Department of Energy (DOE) today released the 2011 Critical Materials Strategy. The report examines the role that rare earth metals and other key materials play in clean energy technologies such as wind turbines, electric vehicles, solar cells and energy-efficient lighting. The report found that several clean energy technologies use materials at risk of supply disruptions in the short term, with risks generally decreasing in the medium and long terms. Supply challenges for five rare earth metals (dysprosium, neodymium, terbium, europium and yttrium) may affect clean energy technology deployment in the years ahead.

296

Evaluating the End-of-Life Phase of Consumer Electronics:Methods and Tools to Improve Product Design and Material Recovery  

E-Print Network [OSTI]

Ge Cu Bi Ag Au REE = Rare Earth Elements Figure 1.4: Miningis also composed of several rare earth elements used in thematerials, such as rare earth elements, are able to be

Mangold, Jennifer Ann

2013-01-01T23:59:59.000Z

297

E-Print Network 3.0 - alkaline earths Sample Search Results  

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

REE with organic matter in alkaline organic rich-water. .H ZRUGV Rare earth... of rare earth elements (REE) to humic acid (HA) and carbonates was studied experimentally at various...

298

E-Print Network 3.0 - alkaline earth neptunatesiv Sample Search...  

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

REE with organic matter in alkaline organic rich-water. .H ZRUGV Rare earth... of rare earth elements (REE) to humic acid (HA) and carbonates was studied experimentally at various...

299

E-Print Network 3.0 - alkaline earth halogenides Sample Search...  

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

REE with organic matter in alkaline organic rich-water. .H ZRUGV Rare earth... of rare earth elements (REE) to humic acid (HA) and carbonates was studied experimentally at various...

300

E-Print Network 3.0 - alkaline earth zinc-aluminophosphate Sample...  

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

REE with organic matter in alkaline organic rich-water. .H ZRUGV Rare earth... of rare earth elements (REE) to humic acid (HA) and carbonates was studied experimentally at various...

Note: This page contains sample records for the topic "rare earth materials" 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

Energy Department Releases New Critical Materials Strategy | Department of  

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

Critical Materials Strategy Critical Materials Strategy Energy Department Releases New Critical Materials Strategy December 15, 2010 - 1:30pm Addthis | Department of Energy Illustration | | Department of Energy Illustration | David Sandalow David Sandalow Former Under Secretary of Energy (Acting) and Assistant Secretary for Policy & International Affairs The Department of Energy released a strategy on critical materials at an event this morning at the Center for Strategic & International Studies. The report examines the role of rare earth metals and other materials used in four clean energy technologies: wind turbines, electric vehicles, solar cells and energy-efficient lighting. You can download the full 171-page report and a 4-page executive summary here. The strategy analyzes 14 elements and identifies five specific rare earth

302

HIGH-PERFORMANCE COMPUTING FOR THE STUDY OF EARTH AND ENVIRONMENTAL SCIENCE MATERIALS USING SYNCHROTRON X-RAY COMPUTED MICROTOMOGRAPHY.  

SciTech Connect (OSTI)

Synchrotron x-ray computed microtomography (CMT) is a non-destructive method for examination of rock, soil, and other types of samples studied in the earth and environmental sciences. The high x-ray intensities of the synchrotron source make possible the acquisition of tomographic volumes at a high rate that requires the application of high-performance computing techniques for data reconstruction to produce the three-dimensional volumes, for their visualization, and for data analysis. These problems are exacerbated by the need to share information between collaborators at widely separated locations over both local and tide-area networks. A summary of the CMT technique and examples of applications are given here together with a discussion of the applications of high-performance computing methods to improve the experimental techniques and analysis of the data.

FENG,H.; JONES,K.W.; MCGUIGAN,M.; SMITH,G.J.; SPILETIC,J.

2001-10-12T23:59:59.000Z

303

Synthesis of refractory materials  

DOE Patents [OSTI]

Refractory metal nitrides are synthesized during a self-propagating combustion process utilizing a solid source of nitrogren. For this purpose, a metal azide is employed, preferably NaN.sub.3. The azide is combusted with Mg or Ca, and a metal oxide is selected from Groups III-A, IV-A, III-B, IV-B, or a rare earth metal oxide. The mixture of azide, Ca or Mg and metal oxide is heated to the mixture's ignition temperature. At that temperature the mixture is ignited and undergoes self-sustaining combustion until the starter materials are exhausted, producing the metal nitride.

Holt, Joseph B. (San Jose, CA)

1984-01-01T23:59:59.000Z

304

Synthesis of refractory materials  

DOE Patents [OSTI]

Refractory metal nitrides are synthesized during a self-propagating combustion process utilizing a solid source of nitrogen. For this purpose, a metal azide is employed, preferably NaN/sub 3/. The azide is combusted with Mg or Ca, and a metal oxide is selected from Groups III-A, IV-A, III-B, IV-B, or a rare earth metal oxide. The mixture of azide, Ca or Mg and metal oxide is heated to the mixture's ignition temperature. At that temperature the mixture is ignited and undergoes self-sustaining combustion until the starter materials are exhausted, producing the metal nitride.

Holt, J.B.

1983-08-16T23:59:59.000Z

305

Earth's Three  

E-Print Network [OSTI]

Broadcast Transcript: From Mongolia, land of fermented mare's milk, comes this beguiling morsel of nomadic oral tradition. It's called yertonciin gorav or Earth's Three. Earth's three what? Well, Earth's three top things in a number of categories...

Hacker, Randi

2010-11-17T23:59:59.000Z

306

Earth Sciences Environmental Earth Sciences,  

E-Print Network [OSTI]

84 Earth Sciences­ Environmental Earth Sciences, Geology MGeol (Single Honours Degrees) Earth Sciences BSc (Single Honours Degrees) Environmental Earth Sciences Geology BSc (Joint Honours Degrees) and among the most research-intensive in Europe. Features * The Department of Earth and Environmental

Brierley, Andrew

307

Earth Sciences Environmental Earth Sciences,  

E-Print Network [OSTI]

94 Earth Sciences­ Environmental Earth Sciences, Geology Degree options MGeol (Single Honours Degrees) Earth Sciences BSc (Single Honours Degrees) Environmental Earth Sciences Geology BSc (Joint placement. * The Geology and Environmental Earth Sciences degrees are accredited by the Geological Society

Brierley, Andrew

308

Earth Forms.  

E-Print Network [OSTI]

??Earth Forms narrates and explains the Masters Project Exhibition by the same name. The sculptures included in the exhibition, Earth Forms, use a variety of… (more)

Mock, Janelle Marie Tullis

2010-01-01T23:59:59.000Z

309

Earth Videos  

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

Earth Videos Earth Videos Our videos speak more than a thousand words about our science and technology, community outreach, collaborations, careers, and much more. News Releases...

310

Dynamic fracture of granular material under quasi-static loading , The Institute of Earth Sciences, The Hebrew University of Jerusalem  

E-Print Network [OSTI]

Dynamic fracture of granular material under quasi-static loading Amir Sagy1 , The Institute;Abstract The dynamics of rapid fracture in heterogeneous grainy media are studied in a series of laboratory experiments in which artificial rock slab is fractured under conditions of uniaxial tension. By performing

Fineberg, Jay

311

Scintillator materials containing lanthanum fluorides  

DOE Patents [OSTI]

An improved radiation detector containing a crystalline mixture of LaF.sub.3 and CeF.sub.3 as the scintillator element is disclosed. Scintillators made with from 25% to 99.5% LaF.sub.3 and the remainder CeF.sub.3 have been found to provide a balance of good stopping power, high light yield and short decay constant that is equal to or superior to other known scintillator materials, and which may be processed from natural starting materials containing both rare earth elements. The radiation detectors disclosed are favorably suited for use in general purpose detection and in positron emission tomography.

Moses, William W. (Berkeley, CA)

1991-01-01T23:59:59.000Z

312

Scintillator materials containing lanthanum fluorides  

DOE Patents [OSTI]

An improved radiation detector containing a crystalline mixture of LaF[sub 3] and CeF[sub 3] as the scintillator element is disclosed. Scintillators made with from 25% to 99.5% LaF[sub 3] and the remainder CeF[sub 3] have been found to provide a balance of good stopping power, high light yield and short decay constant that is equal to or superior to other known scintillator materials, and which may be processed from natural starting materials containing both rare earth elements. The radiation detectors disclosed are favorably suited for use in general purpose detection and in positron emission tomography. 2 figures.

Moses, W.W.

1991-05-14T23:59:59.000Z

313

What is a ŤCritical Material??  

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

outreach Achievements * Ten invention disclosures, to date - Extraction of rare earth elements from phosphoric acid streams - Recovery of neodymium from neodymium iron...

314

U.S. Department of Energy - Critical Materials Strategy  

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

Rare Earth Surcharge for FCC Catalysts and Additives." August 25. http:www.grace.comMediaNewsItem.aspx?id1463179. China Daily. 2009. "China Mulls Plans to Curb Rare Earth...

315

Rammed Earth: Adaptations to Urban Toronto.  

E-Print Network [OSTI]

??Rammed earth is an ancient and imperishable material-process. Traditionally associated with rural construction and underdeveloped settings, the material has begun to enter the modern vernacular.… (more)

Cautius, Cassandra

2014-01-01T23:59:59.000Z

316

Materials  

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

2 MAG LAB REPORTS Volume 18 No. 1 CONDENSED MATTER SCIENCE Technique development, graphene, magnetism & magnetic materials, topological insulators, quantum fl uids & solids,...

317

Increasing Access to Materials Critical to the Clean Energy Economy |  

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

Access to Materials Critical to the Clean Energy Economy Access to Materials Critical to the Clean Energy Economy Increasing Access to Materials Critical to the Clean Energy Economy January 9, 2013 - 12:30pm Addthis Europium, a rare earth element that has the same relative hardness of lead, is used to create fluorescent lightbulbs. With no proven substitutes, europium is considered critical to the clean energy economy. | Photo courtesy of the Ames Laboratory. Europium, a rare earth element that has the same relative hardness of lead, is used to create fluorescent lightbulbs. With no proven substitutes, europium is considered critical to the clean energy economy. | Photo courtesy of the Ames Laboratory. Rebecca Matulka Rebecca Matulka Digital Communications Specialist, Office of Public Affairs Who will be partners?

318

Increasing Access to Materials Critical to the Clean Energy Economy |  

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

Increasing Access to Materials Critical to the Clean Energy Economy Increasing Access to Materials Critical to the Clean Energy Economy Increasing Access to Materials Critical to the Clean Energy Economy January 9, 2013 - 12:30pm Addthis Europium, a rare earth element that has the same relative hardness of lead, is used to create fluorescent lightbulbs. With no proven substitutes, europium is considered critical to the clean energy economy. | Photo courtesy of the Ames Laboratory. Europium, a rare earth element that has the same relative hardness of lead, is used to create fluorescent lightbulbs. With no proven substitutes, europium is considered critical to the clean energy economy. | Photo courtesy of the Ames Laboratory. Rebecca Matulka Rebecca Matulka Digital Communications Specialist, Office of Public Affairs Who will be partners?

319

Microsoft Word - FINAL Materials Strategy Request for Information May 5 2010  

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

Materials Strategy Materials Strategy Request for Information (RFI) DATE: May 6, 2010 SUBJECT: Request for Information (RFI) DESCRIPTION: The Department of Energy (DOE) recently announced its intent to develop its first-ever strategic plan for addressing the role of rare earth and other materials in energy technologies and processes. In support of this effort, DOE is seeking information from stakeholders on rare earth elements and other materials used in energy technologies, particularly clean energy components and applications, and energy efficiency technologies. Examples include lanthanum and lithium use in batteries, neodymium use in permanent magnet motors and compact fluorescent light bulbs, gallium and ytterbium use in photovoltaics, as well as the use of these materials in other clean energy

320

Earth Sciences | ornl.gov  

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

Biogeochemistry Multiscale Energy Science Future Technology Knowledge Discovery Materials Mathematics National Security Systems Modeling Engineering Analysis Behavioral Sciences Geographic Information Science and Technology Quantum Information Science Supercomputing and Computation Home | Science & Discovery | Supercomputing and Computation | Research Areas | Earth Sciences SHARE Earth Sciences Computational Earth Sciences research at ORNL encompasses many important aspects of global and regional Earth system model development and analysis. We focus on numerical methods development and implementation, data analytics, verification and validation of Earth system components, and the development of methods to characterize stochastic behavior. Significant progress is underway in the areas of scalable time stepping algorithms,

Note: This page contains sample records for the topic "rare earth materials" 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

Materials  

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

Materials Materials and methods are available as supplementary materials on Science Online. 16. W. Benz, A. G. W. Cameron, H. J. Melosh, Icarus 81, 113 (1989). 17. S. L. Thompson, H. S. Lauson, Technical Rep. SC-RR-710714, Sandia Nat. Labs (1972). 18. H. J. Melosh, Meteorit. Planet. Sci. 42, 2079 (2007). 19. S. Ida, R. M. Canup, G. R. Stewart, Nature 389, 353 (1997). 20. E. Kokubo, J. Makino, S. Ida, Icarus 148, 419 (2000). 21. M. M. M. Meier, A. Reufer, W. Benz, R. Wieler, Annual Meeting of the Meteoritical Society LXXIV, abstr. 5039 (2011). 22. C. B. Agnor, R. M. Canup, H. F. Levison, Icarus 142, 219 (1999). 23. D. P. O'Brien, A. Morbidelli, H. F. Levison, Icarus 184, 39 (2006). 24. R. M. Canup, Science 307, 546 (2005). 25. J. J. Salmon, R. M. Canup, Lunar Planet. Sci. XLIII, 2540 (2012). Acknowledgments: SPH simulation data are contained in tables S2 to S5 of the supplementary materials. Financial support

322

Dynamic Compression of Earth Materials  

Science Journals Connector (OSTI)

...Seismology (TID 25572, U.S. Atomic Energy Commission, Oak Ridge, Tenn., 1972...against the new Soviet mis-siles," Energy and Technology Review, 18 Oc-tober...the lag produced by heat storage in the oceans, the match is very close. The reasoning...

Thomas J. Ahrens

1980-03-07T23:59:59.000Z

323

SOLID EARTH OPTION FOR EARTH SCIENCE (GYA/GYS) MAJORS The main goals of the Solid Earth option are to give you an understanding of how our lively  

E-Print Network [OSTI]

SOLID EARTH OPTION FOR EARTH SCIENCE (GYA/GYS) MAJORS The main goals of the Solid Earth option tools we use to unravel its complex history. Solid Earth science is the study of the materials, architecture, and processes of the dynamic solid Earth. It deals with rock-forming minerals and processes

Liu, Paul

324

CRITICAL MATERIALS INSTITUTE PROJECTS  

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

Future Opportunities 3 3-1 3.1.6 Herbst, Scott INL Enhanced Separation of Adjacent Rare Earth Elements 1 1-2 1.2.1 Fox, Bob INL Supercritical Fluid Beneficiation of Waste Streams 3...

325

Earth Tremors  

Science Journals Connector (OSTI)

... IN Prof. Milne's article in NATURE of December 26, he states that earth tremors are more frequent during the winter than during the ...

W. L. DALLAS

1896-02-27T23:59:59.000Z

326

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

327

Earth Science The Wiess School of Natural Sciences  

E-Print Network [OSTI]

143 Earth Science The Wiess School of Natural Sciences CHAIR Alan Levander PROFESSORS John B Physics I and II with lab ESCI 321 Earth System Evolution and Cycles ESCI 322 Earth Chemistry and Materials ESCI 323 Earth Structure and Deformation with lab ESCI 324 Earth's Interior ESCI Degrees Offered

Richards-Kortum, Rebecca

328

146 Earth Science 147 Earth Science  

E-Print Network [OSTI]

146 Earth Science 147 Earth Science ESCI 101 The Earth or ESCI 102 Evolution of the Earth or ESCI 107 Oceans and Global Change or ESCI 108 Crises of the Earth ESCI 105 Introductory Lab for Earth Geophysics I ESCI 444 Exploration Geophysics II or ESCI 446 Solid Earth Geophysics Math and Other Sciences

Richards-Kortum, Rebecca

329

Earth tides  

SciTech Connect (OSTI)

Nineteen papers on gravity, tilt, and strain tides are compiled into this volume. Detailed chapters cover the calculation of the tidal forces and of the Earth's response to them, as well as actual observations of earth tides. Partial Contents: On Earth tides. The tidal forces: Tidal Forces. New Computations of the Tide-Generating Potential. Corrected Tables of Tidal Harmonics. The Theory of Tidal Deformations. Body Tides on an Elliptical, Rotating, Elastic and Oceanless Earth, Deformation of the Earth by Surface Loads. Gravimetric Tidal Loading Computed from Integrated Green's Functions. Tidal Friction in the Solid Earth. Loading Tides Versus Body Tides. Lunar Tidal Acceleration from Earth Satellite Orbit Analysis. Observations: gravity. Tidal Gravity in Britain: Tidal Loading and the Spatial Distribution of the Marine Tide. Tidal Loading along a Profile Europe-East Africa-South Asia-Australia and the Pacific Ocean. Detailed Gravity-Tide Spectrum between One and Four Cycles per Day. Observations: tilt and strain. Cavity and Topographic Effects in Tilt and Strain Measurement. Observations of Local Elastic Effects on Earth Tide Tilts and Strains.

Harrison, J.C.

1984-01-01T23:59:59.000Z

330

CMI Affiliate Members | Critical Materials Institute  

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

mineral exploration and development company focused on critical metals including Rare Earth Elements (REE's) and tungsten (W) in Scandinavia. Tasman is listed on the TSX Venture...

331

CMI Recent Presentations | Critical Materials Institute  

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

and outreach: CMI Education and Outreach Programs CMI Director Alex King describes rare earth elements for the Iowa State University Osborn Club, March 2014 Link to some older...

332

Iowa lab gets critical materials research center  

Broader source: Energy.gov [DOE]

The DOE hub is set to be the largest R&D effort toward alleviating the global shortage of rare earth metals.

333

Earth tides, earthquake occurrence and earth deformation.  

E-Print Network [OSTI]

??An analysis of Earth deformation, earthquakes and tides has been undertaken using Earth tide and interferometric SAR data from ESA satellites. The ability of Earth… (more)

Kansowa, Tarek

2010-01-01T23:59:59.000Z

334

Microsoft PowerPoint - Siemens_materials workshop MIT EI_120310.ppt [Compatibility Mode]  

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

Critical Critical Materials and Substitutes Critical Materials and Substitutes Siemens Corporation Dr Madhav D Manjrekar Dr. Madhav D. Manjrekar Green Energy & Power Systems Dr. Thomas Scheiter & Dr. Gotthard Rieger Materials Substitution and Recycling Materials Substitution and Recycling Dr. Martin Zachau & Pamela Horner OSRAM Sylvania y Dr. Henrik Stiesdal Siemens Wind Power ©Siemens Corporation, Corporate Research, 2010. All rights reserved. ©Siemens Corporation, Corporate Research, 2010. All rights reserved. Agenda * Introduction Introduction * Application Requirements * Renewable Generation & Power Electronics * Lighting * Lighting * Discussion Trans-Atlantic Workshop on Rare Earth Elements and Other Critical Materials for a Clean Energy Future Hosted by the MIT Energy Initiative

335

Rare muon processes  

SciTech Connect (OSTI)

The status of rare muon processes as tests of the standard model is reviewed with the emphasis on results that are expected from experiments in the near future.

Cooper, M.D.; The MEGA Collaboration

1993-05-01T23:59:59.000Z

336

Rare muon processes  

SciTech Connect (OSTI)

The status of rare muon processes as tests of the standard model is reviewed with the emphasis on results that are expected from experiments in the near future.

Cooper, M.D.

1993-01-01T23:59:59.000Z

337

Earth's Magnetosphere  

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

50 years ago - are a pair of donut shaped zones of charged particles that surround Earth and occupy the inner region of our planet's Magnetosphere. The outer belt contains...

338

Material efficiency: rare and critical metals  

Science Journals Connector (OSTI)

...obvious in the case of hydrocarbons. But we do not contemplate the recycling of hydrocarbons except perhaps in terms...destructive uses, such as combustion of hydrocarbons, the service is usually...chemical potential, heat (or light) that is...

2013-01-01T23:59:59.000Z

339

Material efficiency: rare and critical metals  

Science Journals Connector (OSTI)

...PhD thesis, Fakulteit Scheikunde, University of Utrecht, Utrecht, The Netherlands. 12 Karlsson, S , C Azar, G Bernedes...gas emissions. PhD thesis, Fakultgeit Scheikunde, Utrecht University, Utrecht, The Netherlands. 18 Matthews...

2013-01-01T23:59:59.000Z

340

Database of the radioactivity of norm used as industrial raw materials  

Science Journals Connector (OSTI)

......02 0 Industrial product Rare-earth oxide - - 0 1 1.9E+03 0 Industrial product Rare-earth fluoride - - 0...03 0 Industrial product Rare-earth carbonate - - 0...02 0 Industrial product Phosphogypsum - - 38 2.8E+02 30 1......

Kazuki Iwaoka; Hidenori Yonehara

2012-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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

Happy Earth Day 2011! | Department of Energy  

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

Day 2011! Day 2011! Happy Earth Day 2011! April 22, 2011 - 7:30am Addthis Allison Casey Senior Communicator, NREL Happy Earth Day! Today, April 22, marks the 41st anniversary of Earth Day. Check out these resources from the Department of Energy to help you celebrate, get in the Earth Day spirit, and take action: Earth Day Website This page from the Office of Energy Efficiency and Renewable Energy highlights other great resources to help you be energy efficient and Earth-friendly Earth Day 2011 Outreach Materials These materials from the Federal Energy Management Program will help you develop a workplace energy awareness program and "Act Now; Together We Can Create a Greener Future." Happy Earth Day! If you haven't already shared how you're celebrating, be sure to e-mail your responses to the Energy Saver team at

342

Nd systematics of Earth are inconsistent with a superchondritic Sm/Nd ratio  

E-Print Network [OSTI]

to chondrites (2). The assumption that the refractory elements (e.g., rare earth elements) in the Earth. A basic assumption in most models for the Earth's composition is that the refractory elements are present not chondritic; it has long been known that Earth is de- pleted in volatile elements (e.g., K) relative

Mukhopadhyay, Sujoy

343

PUBLISHED ONLINE: 25 MAY 2014 | DOI: 10.1038/NGEO2170 Earth's earliest evolved crust generated in an  

E-Print Network [OSTI]

that this rock unit is characterized by iron enrichment, negative Europium anomalies, unfractionated rare-earth-element/Y, strong depletions in the heavy rare-earth elements (HREEs), and minor or absent Eu anomalies11LETTERS PUBLISHED ONLINE: 25 MAY 2014 | DOI: 10.1038/NGEO2170 Earth's earliest evolved crust

Machel, Hans

344

The Department of Energy's Critical Materials Strategy | Department of  

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

The Department of Energy's Critical Materials The Department of Energy's Critical Materials Strategy The Department of Energy's Critical Materials Strategy The U.S. Department of Energy (DOE) supports a proactive and comprehensive approach to address the challenges associated with the use of rare earth elements and other critical materials in clean energy technologies. In 2010 the Department developed its first-ever Critical Materials Strategy based on three strategic pillars: 1) diversifying global supply chains to mitigate supply risk; 2) developing material and technology substitutes; and 3) promoting recycling, reuse and more efficient use to significantly lower global demand for critical materials. In 2011 DOE updated its criticality assessments and provided in-depth market and technology analyses in response to important developments during the year. DOE will

345

08/23/2007 09:59 PMInterstellar dust clouds may have sown seeds of life on Earth Page 1 of 2http://www.dailyindia.com/show/167969.php/Interstellar-dust-clouds-may-have-sown-seeds-of-life-on-Earth  

E-Print Network [OSTI]

://www.dailyindia.com/show/167969.php/Interstellar-dust-clouds-may-have-sown-seeds-of-life-on-Earth www.rare-earth-magnets.com Ads known elements necessary for supporting life on Earth. Adenine, an essential organic molecule, without) and Elliot McKee (St. Louis University). Copyright Dailyindia.com/ANI www.rare-earth-magnets.com Feedback

Glaser, Rainer

346

Google Earth Gallery  

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

Google Earth Gallery Google Earth Gallery Use Google Earth to view our efforts in cleaning the past, protecting the present, and creating a sustainable future. Tours Air Quality...

347

Breaking Earth Poems  

E-Print Network [OSTI]

CALIFORNIA RIVERSIDE Breaking Earth Poems A Thesis submittedFestival……………………………………………………………………..…..14 Earth Against Mylittle else in their hands. Earth Against My Back I lay in

Hernandez, Scott Mcnaul

2012-01-01T23:59:59.000Z

348

Review of activities in USA on HTS materials  

SciTech Connect (OSTI)

Rapid progress in attaining practical applications of High Temperature Superconductors (HTS) has been made since the discovery of these new materials. Many critical parameters influencing HTS powder synthesis and wire processing have been identified through a combination of fundamental exploration and applied research. The complexity of these novel materials with regard to phase behavior and physical properties has become evident as a result of these careful studies. Achieving optimal mechanical and superconducting properties in wires and tapes will require further understanding and synergy among several different technical disciplines. Highlights of efforts towards producing practical superconductors for electric power applications based on rare earth-, bismuth-, and thallium-based systems are reviewed.

Peterson, D.E.

1995-02-01T23:59:59.000Z

349

The Department of Energy Releases Strategy on Critical Materials |  

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

The Department of Energy Releases Strategy on Critical Materials The Department of Energy Releases Strategy on Critical Materials The Department of Energy Releases Strategy on Critical Materials December 15, 2010 - 12:00am Addthis The Department of Energy today released its Critical Materials Strategy. The strategy examines the role of rare earth metals and other materials in the clean energy economy, based on extensive research by the Department during the past year. The report focuses on materials used in four technologies - wind turbines, electric vehicles, solar cells and energy-efficient lighting. "Each day, researchers and entrepreneurs across the United States are working to develop and deploy clean energy technologies that will enhance our security, reduce carbon pollution and promote economic prosperity. This

350

Synthesis, Structure and Characterization Of Polynuclear Rare Earth Alkoxide Clusters  

E-Print Network [OSTI]

analogues were characterized by spectrofluorimetry. Hexanuclear oxo-centered Dy and Gd clusters were synthesized: the OH-face capped Gd?(??-O)(??-OH)?(??-O)?(PhB(OEt)?)?(dpm)?(HOEt)? and Gd?(??-O)(??-OH)?(dpm)? as well as the edg-bridged [Dy?(??-O)(??-OCH?...

Dempsey, Scotty Lee

2014-04-30T23:59:59.000Z

351

Ultracold chemistry with alkali-metal-rare-earth molecules  

E-Print Network [OSTI]

A first principles study of the dynamics of $^6$Li($^{2}$S) + $^6$Li$^{174}$Yb($^2\\Sigma^+$)$ \\to ^6$Li$_2(^1\\Sigma^+$) + $^{174}$Yb($^1$S) reaction is presented at cold and ultracold temperatures. The computations involve determination and analytic fitting of a three-dimensional potential energy surface for the Li$_2$Yb system and quantum dynamics calculations of varying complexities, ranging from exact quantum dynamics within the close-coupling scheme, to statistical quantum treatment, and universal models. It is demonstrated that the two simplified methods yield zero-temperature limiting reaction rate coefficients in reasonable agreement with the full close-coupling calculations. The effect of the three-body term in the interaction potential is explored by comparing quantum dynamics results from a pairwise potential that neglects the three-body term to that derived from the full interaction potential. Inclusion of the three-body term in the close-coupling calculations was found to reduce the limiting rate coefficients by a factor of two. The reaction exoergicity populates vibrational levels as high as $v=19$ of the $^6$Li$_2$ molecule in the limit of zero collision energy. Product vibrational distributions from the close-coupling calculations reveal sensitivity to inclusion of three-body forces in the interaction potential. Overall, the results indicate that a simplified model based on the long-range potential is able to yield reliable values of the total reaction rate coefficient in the ultracold limit but a more rigorous approach based on statistical quantum or quantum close-coupling methods is desirable when product rovibrational distribution is required.

C. Makrides; J. Hazra; G. B. Pradhan; A. Petrov; B. K. Kendrick; T. González-Lezana; N. Balakrishnan; S. Kotochigova

2014-10-28T23:59:59.000Z

352

Ultracold chemistry with alkali-metal-rare-earth molecules  

E-Print Network [OSTI]

A first principles study of the dynamics of $^6$Li($^{2}$S) + $^6$Li$^{174}$Yb($^2\\Sigma^+$)$ \\to ^6$Li$_2(^1\\Sigma^+$) + $^{174}$Yb($^1$S) reaction is presented at cold and ultracold temperatures. The computations involve determination and analytic fitting of a three-dimensional potential energy surface for the Li$_2$Yb system and quantum dynamics calculations of varying complexities, ranging from exact quantum dynamics within the close-coupling scheme, to statistical quantum treatment, and universal models. It is demonstrated that the two simplified methods yield zero-temperature limiting reaction rate coefficients in reasonable agreement with the full close-coupling calculations. The effect of the three-body term in the interaction potential is explored by comparing quantum dynamics results from a pairwise potential that neglects the three-body term to that derived from the full interaction potential. Inclusion of the three-body term in the close-coupling calculations was found to reduce the limiting rate ...

Makrides, C; Pradhan, G B; Petrov, A; Kendrick, B K; González-Lezana, T; Balakrishnan, N; Kotochigova, S

2014-01-01T23:59:59.000Z

353

Non-Rare Earth High-Performance Wrought Magnesium Alloys  

Broader source: Energy.gov [DOE]

2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

354

Rare Earths Compounds DOI: 10.1002/ange.201002338  

E-Print Network [OSTI]

) characterized by covalent bonds between the transition metals (T) and the highly polarizable (monoatomic) carbon of the transition metals cause high negative charges on the complex carbometalate anions, which have to be balanced a special class of ternary and higher carbides containing complex anions n 1 Ă°TyCzĂ?mĂ? Ă? Ă? (n = 0, 1, 2, 3

Widom, Michael

355

Synthesis, crystal structure and properties of Mg{sub 3}B{sub 36}Si{sub 9}C and related rare earth compounds RE{sub 3?x}B{sub 36}Si{sub 9}C (RE=Y, Gd–Lu)  

SciTech Connect (OSTI)

We report on the synthesis and characterisation of Mg{sub 3}B{sub 36}Si{sub 9}C. Black single crystals of hexagonal shape were yielded from the elements at 1600 °C in h-BN crucibles welded in Ta ampoules. The crystal structure (space group R3{sup Ż}m, a=10.0793(13) Ĺ, c=16.372(3) Ĺ, 660 refl., 51 param., R{sub 1}(F)=0.019; wR{sub 2}(F{sup 2})=0.051) is characterized by a Kagome-net of B{sub 12} icosahedra, ethane like Si{sub 8}-units and disordered SiC-dumbbells. Vibrational spectra show typical features of boron-rich borides and Zintl phases. Mg{sub 3}B{sub 36}Si{sub 9}C is stable against HF/HNO{sub 3} and conc. NaOH. The micro-hardness is 17.0 GPa (Vickers) and 14.5 GPa (Knoop), respectively. According to simple electron counting rules Mg{sub 3}B{sub 36}Si{sub 9}C is an electron precise compound. Band structure calculations reveal a band gap of 1.0 eV in agreement to the black colour. Interatomic distances obtained from the refinement of X-ray data are biased and falsified by the disorder of the SiC-dumbbell. The most evident structural parameters were obtained by relaxation calculation. Composition and carbon content were confirmed by WDX measurements. The small but significant carbon content is necessary by structural reasons and frequently caused by contaminations. The rare earth compounds RE{sub 3?x}B{sub 36}Si{sub 9}C (RE=Y, Dy–Lu) are isotypic. Single crystals were grown from a silicon melt and their structures refined. The partial occupation of the RE-sites fits to the requirements of an electron-precise composition. According to the displacement parameters a relaxation should be applied to obtain correct structural parameters. - Graphical abstract: Single crystals of the new boridesilicide Mg{sub 3}B{sub 36}Si{sub 9}C were obtained from the elements in a Si-melt. Besides B{sub 12}-icosahedra and ethan-like Si{sub 8}-units it contains a disordered SiC-dumbbell. Correct distances were obtained by relaxation calculation based on the X-ray data. Highlights: • Black single crystals of Mg{sub 3}B{sub 36}Si{sub 9}C were yielded from the elements at 1600 °C. • The rare earth compounds RE{sub 3–x}B{sub 36}Si{sub 9}C (RE=Y, Gd–Lu) are isotypic. • Correct structural parameters result from X-ray data and subsequent relaxation.

Ludwig, Thilo; Pediaditakis, Alexis; Sagawe, Vanessa [Albert-Ludwigs-Universität Freiburg, Institut für Anorganische und Analytische Chemie, Albertstr. 21, D-79104 Freiburg (Germany); Freiburger Materialforschungszentrum FMF, Stefan-Maier-Str. 25, D-79104 Freiburg (Germany); Hillebrecht, Harald, E-mail: harald.hillebrecht@ac.uni-freiburg.de [Albert-Ludwigs-Universität Freiburg, Institut für Anorganische und Analytische Chemie, Albertstr. 21, D-79104 Freiburg (Germany); Freiburger Materialforschungszentrum FMF, Stefan-Maier-Str. 25, D-79104 Freiburg (Germany)

2013-08-15T23:59:59.000Z

356

Earth Day Haiku  

Science Journals Connector (OSTI)

Earth Day Haiku ... The winning entries in the 2003 Chemists Celebrate Earth Day poetry contest (sponsored by ACS) are presented. ...

2004-02-01T23:59:59.000Z

357

CMI Education and Outreach in 2014 | Critical Materials Institute  

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

Colorado School of Mines, including the geology museum. Mines experts described rare earth elements as they relate to the middle school world and renewable energy. Colorado...

358

Colorado School of Mines Researchers Win Patent | Critical Materials...  

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

oxine functionalized groups. The original work was focused on separating iron and gallium, but the technology may have future applicability to the separation of rare earth elements...

359

CMI Unique Facility: Filtration Test Facility | Critical Materials...  

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

and it addresses the grand challenge of developing technologies for separating the rare earth elements. For more information, and to explore using the filtration test facility,...

360

Earth and Atmospheric Sciences | More Science | ORNL  

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

Nuclear Forensics Climate & Environment Sensors and Measurements Chemical & Engineering Materials Computational Earth Science Systems Modeling Geographic Information Science and Technology Materials Science and Engineering Mathematics Physics More Science Home | Science & Discovery | More Science | Earth and Atmospheric Sciences SHARE Earth and Atmospheric Sciences At ORNL, we combine our capabilities in atmospheric science, computational science, and biological and environmental systems science to focus in the cross-disciplinary field of climate change science. We use computer models to improve climate change predications and to measure the impact of global warming on the cycling of chemicals in earth systems. Our Climate Change Science Institute uses models to explore connections among atmosphere,

Note: This page contains sample records for the topic "rare earth materials" 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

Mining the earth  

SciTech Connect (OSTI)

Substances extracted from the earth - stone, iron, bronze - have been so critical to human development that historians name the ages of our past after them. But while scholars have carefully tracked human use of minerals, they have never accounted for the vast environmental damage incurred in mineral production. Few people would guess that a copper mining operation has removed a piece of Utah seven times the weight of all the material dug for the Panama Canal. Few would dream that mines and smelters take up to a tenth of all the energy used each year, or that the waste left by mining measures in the billions of tons - dwarfing the world's total accumulation of more familiar kinds of waste, such as municipal garbage. Indeed, more material is now stripped from the earth by mining than by all the natural erosion of the earth's rivers. The effects of mining operations on the environment are discussed under the following topics: minerals in the global economy, laying waste, at what cost cleaning up, and dipping out. It is concluded that in the long run, the most effective strategy for minimizing new damage is not merely to make mineral extraction cleaner, but to reduce the rich nations needs for virgin (non-recycled) minerals.

Young, J.E.

1992-01-01T23:59:59.000Z

362

Rare hadronic B decays  

E-Print Network [OSTI]

Rare hadronic B-meson decays allow us to study CP violation. The class of B decays final states containing two vector mesons provides a rich set of angular correlation observables to study. This article reviews some of the recent experimental results from the BaBar and Belle collaborations.

A. J. Bevan

2006-06-02T23:59:59.000Z

363

Earth melter  

SciTech Connect (OSTI)

An apparatus, and method of operating the apparatus, wherein a feed material is converted into a glassified condition for subsequent use or disposal. The apparatus is particularly useful for disposal of hazardous or noxious waste materials which are otherwise either difficult or expensive to dispose of. The apparatus is preferably constructed either by excavating a melt zone in a quantity of soil or rock, or by constructing a melt zone in an apparatus above grade and lining the melt zone with a back fill material if refractory properties are needed. The feed material is fed into the melt zone and, preferably, combusted to an ash, whereupon the heat of combustion is used to melt the ash to a molten condition. Electrodes may be used to maintain the molten feed material in a molten condition, and to maintain homogeneity of the molten materials.

Chapman, Christopher C. (Richland, WA)

1995-01-01T23:59:59.000Z

364

Thermal Analysis Methods for an Earth Entry Vehicle  

Science Journals Connector (OSTI)

Thermal analysis of a vehicle designed to return samples from another planet, such as the Earth Entry vehicle for the Mars Sample Return mission, presents several challenges. The Earth Entry Vehicle (EEV) must contain Martian material samples after they ...

Amundsen Ruth M.; Dec John A.; Lindell Michael C.

2000-08-01T23:59:59.000Z

365

GOOGLE EARTH QUICK GUIDE (1)Google Earth Features  

E-Print Network [OSTI]

GOOGLE EARTH QUICK GUIDE (1)Google Earth Features The Google Earth of the Google Earth window. Often when opening up the Google Earth program, the view screen will be a view of the entire Earth from space. Navigation bar

Smith-Konter, Bridget

366

Shaped by the past, creating the future Department of Earth Sciences  

E-Print Network [OSTI]

-Hf). Commonly analysed trace elements include the rare earth elements plus rst and second row transition: www.dur.ac.uk/earth.sciences/research/nciet 05585 Northern Centre Isotopic Elemental_05585 NorthernShaped by the past, creating the future Department of Earth Sciences Northern Centre for Isotopic

Wirosoetisno, Djoko

367

Earth'future climate  

Science Journals Connector (OSTI)

...their visions of the future I. Astronomy and Earth sciences compiled by J. M. T. Thompson Earth'future climate Mark A. Saunders 1 1 Benfield...provide informed scientific projections for Earth's climate into the next millennium. This...

1999-01-01T23:59:59.000Z

368

Protecting Life on Earth  

E-Print Network [OSTI]

Review: Protecting Life on Earth: An Introduction to thePeter B. Protecting Life on Earth: An Introduction to theof Protecting Life on Earth is “to explain to an intelligent

Anderson, Byron P.

2011-01-01T23:59:59.000Z

369

Charge Compensation in RE3+ (RE = Eu, Gd) and M+ (M = Li, Na, K) Co-Doped Alkaline Earth Nanofluorides Obtained by Microwave Reaction with Reactive Ionic Liquids Leading to Improved Optical Properties  

SciTech Connect (OSTI)

Alkaline earth fluorides are extraordinarily promising host matrices for phosphor materials with regard to rare earth doping. In particular, quantum cutting materials, which might considerably enhance the efficiency of mercury-free fluorescent lamps or SC solar cells, are often based on rare earth containing crystalline fluorides such as NaGdF4, GdF3 or LaF3. Substituting most of the precious rare earth ions and simultaneously retaining the efficiency of the phosphor is a major goal. Alkaline earth fluoride nanoparticles doped with trivalent lanthanide ions (which are required for the quantum cutting phenomenon) were prepared via a microwave assisted method in ionic liquids. As doping trivalent ions into a host with divalent cations requires charge compensation, this effect was thoroughly studied by powder X-ray and electron diffraction, luminescence spectroscopy and 23Na, 139La and 19F solid state NMR spectroscopy. Monovalent alkali ions were codoped with the trivalent lanthanide ions to relieve stress and achieve a better crystallinity and higher quantum cutting abilities of the prepared material. 19F-magic angle spinning (MAS)-NMR-spectra, assisted by 19F{23Na} rotational echo double resonance (REDOR) studies, reveal distinct local fluoride environments, the populations of which are discussed in relation to spatial distribution and clustering models. In the co-doped samples, fluoride species having both Na+ and La3+ ions within their coordination sphere can be identified and quantified. This interplay of mono- and trivalent ions in the CaF2 lattice appears to be an efficient charge compensation mechanism that allows for improved performance characteristics of such co-doped phosphor materials.

Lorbeer, C [Ruhr-Universitat Bochum; Behrends, F [Westfalische Wilhelsm-Universitat Munster; Cybinska, J [Ruhr Universitat Bochum; Eckert, H [Westfalische Wilhelsm-Universitat Munster; Mudring, Anja -V [Ames Laboratory

2014-01-01T23:59:59.000Z

370

Earth System Modeling  

Science Journals Connector (OSTI)

Earth system models are important research tools for improving understanding ... climate system (and maybe never will), Earth system models nowadays typically focus on specific aspects, for...

Patrick Jöckel

2012-01-01T23:59:59.000Z

371

Earth Science The Wiess School of Natural Sciences  

E-Print Network [OSTI]

149 Earth Science The Wiess School of Natural Sciences Chair Alan Levander Professors John B Yitian Xiao Degrees Offered: B.A., B.S., M.A., Ph.D. All undergraduate majors in earth science take a 4 -course core sequence, typically in the sophomore and junior years, on earth processes, materials

Richards-Kortum, Rebecca

372

CMI in Research Publications | Critical Materials Institute  

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

works on magnets for CMI, and leads the Reduced Rare Earth Content High Performance Magnet project. Canfield and CMI scientist Sergey Bud'ko are co-authors on several...

373

Older Public Presentations | Critical Materials Institute  

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

and Recycling Tom Lograsso, leader for Crosscutting Research Alex King Describing rare earth elements in a TEDx talk (video link, 18:20), September 2013 Kiwanis Club, June 21,...

374

Earth Structure Introduction  

E-Print Network [OSTI]

Earth Structure Introduction Earth Structure (2nd Edition), 2004 W.W. Norton & Co, New York Slide show by Ben van der Pluijm © WW Norton, unless noted otherwise #12;© EarthStructure (2nd ed) 210/4/2010 Aerial views #12;© EarthStructure (2nd ed) 310/4/2010 http://www.globalchange.umich.edu/Ben/ES/ #12

375

Materials science: The pull of stronger magnets  

Science Journals Connector (OSTI)

... in the 1990s. The limit has hampered efforts to make high-tech products such as electric cars more efficient. And in the past two years, the cost of the rare-earth ... . And many devices that are part of the green economy require substantial amounts: an electric car carries a few kilograms of rare-earth elements, and a 3-megawatt wind turbine ...

Nicola Jones

2011-04-06T23:59:59.000Z

376

LANL | Solid Earth Geophysics | EES-17  

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

LANL : Earth & Environmental Sciences : Solid Earth Geophysics (EES-17) LANL : Earth & Environmental Sciences : Solid Earth Geophysics (EES-17) Home Publications Collaboration & Links Staff Research Highlights Ground-Based Nuclear Explosion Monitoring Geodynamics & National Security Nonlinear Elasticity Time Reversal Los Alamos Seismic Network Stimulated Porous Fluid Flow Resource Recovery Seismic & Acoustic Imaging Exploration Geophysics Induced Seismicity Volcanoes & Earthquakes Other Research CONTACTS Group Leader Ken Rehfeldt Administrative Contacts Jody Benson Cecilia Gonzales Geophysics (EES-17) The Geophysics Group supports the national security mission of Los Alamos National Laboratory by providing technical expertise to monitor movement of Earth's crust while predicting the effects of these events on the environment. Though our focus is on seismic monitoring, we also apply electric, magnetic, radionuclide, and acoustic technologies to monitor underground explosions, maintain our ability to conduct tests, and develop the Yucca Mountain Project. In addition, we study the nonlinear properties of earth materials, imaging with seismic waves, how seismic waves affect the interaction of porous rocks and fluids, use of seismic waves to characterize underground oil reservoirs, volcanology and volcanic seismicity, advanced computational physics of earth materials, and using drilling technology to study the crust of the earth. These tasks are complemented by our extensive background in both conventional and hot dry rock geothermal energy development and geophysical support of the Nevada Test Site.

377

The Colorado Rare Plant Technical Committee Rare Plant Symposium  

E-Print Network [OSTI]

The Colorado Rare Plant Technical Committee presents: 4th Annual Rare Plant Symposium Sponsored by: Colorado Native Plant Society University of Colorado Herbarium US Fish and Wildlife Service Colorado: G2G3/S2S3 Global distribution: Colorado (Larimer and Boulder counties). Possibly extending

378

Propane earth materials drying techniques and technologies.  

E-Print Network [OSTI]

??A feasibility study for the use of propane as a subbase drying technique. Michael Blahut (1) Dr. Vernon Schaefer (2) Dr. Chris Williams (3) The… (more)

Blahut, Michael Edward

2010-01-01T23:59:59.000Z

379

November 28, 2006 Seismologists get handle on heat flow deep in earth  

E-Print Network [OSTI]

November 28, 2006 Seismologists get handle on heat flow deep in earth Earth's interior placid inner Earth as a dynamic environment filled with exotic materials and substances roiling under that has an impact on what happens on our planet's surface. The latest evidence of this dynamic inner Earth

Garnero, Ed

380

Earth System Models  

Science Journals Connector (OSTI)

Earth system analysis — this term is often associated with the study of the ‘solid’ Earth with its surrounding spheres, the atmosphere, cryosphere, and hydrosphere. However, within IGBP (the International Geos...

Martin Clussen

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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

Argonne's Earth Day 2011  

ScienceCinema (OSTI)

Argonne celebrated Earth Day on April 21, 2011 with an event that featured green activities and information booths.

None

2013-04-19T23:59:59.000Z

382

Muon diagnostics of the Earth’s atmosphere and magnetosphere  

Science Journals Connector (OSTI)

A method of distant monitoring of the Earth’s magnetosphere and atmosphere is described, which is based on the close correlation between the modulations in the flux of atmospheric muons detected at the Earth’s su...

N. S. Barbashina; V. V. Borog…

2007-07-01T23:59:59.000Z

383

Earth & Aquatic Sciences | Clean Energy | ORNL  

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

Earth and Aquatic Sciences Earth and Aquatic Sciences SHARE Earth and Aquatic Sciences Create and apply new knowledge across multiple scales to aid decision makers on the stewardship of air, water and land resources. Many factors affect the fate, transport and transformation of metal and radionuclide contaminants found on DOE lands. A fundamental understanding of environmental inorganic and biological interactions is needed for deriving practical solutions to management of DOE lands. ORNL applies molecular to field-scale chemistry, hydrology and microbiology expertise, together with neutron scattering, nano-materials sciences facilities, computing resources and comprehensive models in environmental remediation sciences research. Multiple research projects are carried out with aims of

384

Accretion of the Earth  

Science Journals Connector (OSTI)

...Issue Origin and differentiation of the Earth: past to present organized by Andrew Jephcoat and Alex Halliday Accretion of the Earth Robin M Canup * * ( robin@boulder.swri...Boulder, CO 80302, USA The origin of the Earth and its Moon has been the focus of an enormous...

2008-01-01T23:59:59.000Z

385

Earth Day Plus 40  

Science Journals Connector (OSTI)

Earth Day Plus 40 ... Many of our readers were not even born at the time of the first Earth Day, April 22, 1970. ... The first Earth Day was the brainchild of Wisconsin Senator Gaylord Nelson, who suggested the idea of a national “teach-in”. ...

Jerald L. Schnoor

2010-03-10T23:59:59.000Z

386

Supra-Earth affairs  

Science Journals Connector (OSTI)

...Martin Dominik and John C. Zarnecki Supra-Earth affairs Mazlan Othman * * mazlan.othman...Nations activities in the field of near-Earth objects in some detail, and suggests that...extra-terrestrial intelligence|near-Earth objects|international cooperation in...

2011-01-01T23:59:59.000Z

387

Flattening the earth  

Science Journals Connector (OSTI)

...book-review Book Review Flattening the earth J.S Rowlinson * * Corresponding author...HoareThe quest for the true figure of the Earth: ideas and expeditions in four centuries...notion that everything that happened on the Earth and in the Heavens should have a mechanical...

2007-01-01T23:59:59.000Z

388

Synchrotron studies of narrow band materials  

SciTech Connect (OSTI)

Since last year, we have had three 3-week blocks of beamtime, in April and November 1991 and February 1992, on the Ames/Montana beamline at the Wisconsin Synchrotron Radiation Center (SRC). These runs continued our program on high temperature superconductors, heavy Fermion and related uranium and rare earth materials, and started some work on transition metal oxides. We have also had beamtime at the Brookhaven NSLS, 5 days of beamtime on the Dragon monochromator, beamline U4B, studying resonant photoemission of transition metal oxides using photon energies around the transition metal 2p edges. Data from past runs has been analyzed, and in some cases combined with photoemission and bremsstrahlung isochromat spectroscopy (BIS) data taken in the home U-M lab. 1 fig.

Not Available

1992-01-01T23:59:59.000Z

389

Earth Systems Science Earth Systems Science at UNH  

E-Print Network [OSTI]

Earth Systems Science Earth Systems Science at UNH THE UNH Institute for the Study of Earth, Oceans, and Space (EOS) Earth Systems Research Center is dedicated to understanding the Earth as an integrative scientists and students study the Earth's ecosystems, atmosphere, water, and ice using field measurements

Pringle, James "Jamie"

390

UK bridge to rare tongues  

E-Print Network [OSTI]

  THE TELEGRAPH - About Us - Advertise - Feedback - Contact Us     /div> 2 Front Page > Nation > Story UK bridge to rare tongues London, Dec. 12 (PTI): Cambridge University has launched a project to provide public access to languages...

Anon.

2010-12-13T23:59:59.000Z

391

PRESS RELEASE RARE FRUIT CONFERENCE  

E-Print Network [OSTI]

RELEASE RARE FRUIT CONFERENCE July 9 - 13, 2014 Sponsored by the Tropical Fruit & Vegetable Society of the Redland & the Fruit & Spice Park 24801 SW 187th Avenue, Homestead, Florida

Jawitz, James W.

392

A Rare Isolated Trapezoid Fracture  

E-Print Network [OSTI]

wrist in suggested scaphoid fracture. Acta Radiol. 1988;29:Rare isolated trapezoid fracture: a case report. Hand. 2008;suspect and diagnose this fracture. 2,8 REFERENCES 1. Papp

Afifi, Negean; Lu, Jenny J

2011-01-01T23:59:59.000Z

393

CoolEarth formerly Cool Earth Solar | Open Energy Information  

Open Energy Info (EERE)

CoolEarth formerly Cool Earth Solar CoolEarth formerly Cool Earth Solar Jump to: navigation, search Name CoolEarth (formerly Cool Earth Solar) Place Livermore, California Zip 94550 Product CoolEarth is a concentrated PV developer using inflatable concentrators to focus light onto triple-junction cells. References CoolEarth (formerly Cool Earth Solar)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. CoolEarth (formerly Cool Earth Solar) is a company located in Livermore, California . References ↑ "CoolEarth (formerly Cool Earth Solar)" Retrieved from "http://en.openei.org/w/index.php?title=CoolEarth_formerly_Cool_Earth_Solar&oldid=343892" Categories: Clean Energy Organizations

394

DOE - Office of Legacy Management -- International Rare Metals Refinery Inc  

Office of Legacy Management (LM)

Rare Metals Refinery Rare Metals Refinery Inc - NY 38 FUSRAP Considered Sites Site: International Rare Metals Refinery, Inc. (NY.38 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: Canadian Radium and Uranium Corporation NY.38-1 Location: 69 Kisko Avenue , Mt. Kisko , New York NY.38-1 NY.38-3 Evaluation Year: 1987 NY.38-4 Site Operations: Manufactured and distributed radium and polonium products. NY.38-5 Site Disposition: Eliminated - No Authority - Site was a commercial operation not under the jurisdiction of DOE predecessor agencies NY.38-2 NY.38-4 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Radium, Plutonium NY.38-5 Radiological Survey(s): Yes NY.38-1 NY.38-5 Site Status: Eliminated from consideration under FUSRAP

395

Dempsey-012114 - Argonne National Laboratories, Materials Sicence Division  

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

Dempsey-012114 Dempsey-012114 MATERIALS SCIENCE SEMINAR SPEAKER: Nora Dempsey Institut Néel - CNRS, 
France TITLE: High performance hard magnetic films: from model systems to micro-system applications DATE: Monday, January 14, 2013 TIME: 11:00 a.m. PLACE: Building 223 / S-105 HOST: Jidong Samuel Jiang ABSTRACT: High performance hard magnetic materials are of growing importance for clean energy technologies (hybrid electric vehicles, gearless wind turbines...) and have great potential for use in micro-systems. In this talk I will report on the preparation and characterisation of NdFeB thick films. On the one hand these films are used as model systems to study magnetization reversal, with the aim of guiding the development of heavy rare earth free magnets. On the other, they are

396

Examining Earth's Ecological Problems  

Science Journals Connector (OSTI)

Examining Earth's Ecological Problems ... In "Earth in the Balance: Ecology and the Human Spirit," Sen. Al Gore (D.-Tenn.) ... However, nearly all of it is a fluffy recapitulation of the doomsday theories of those members of a modern environmentalist group who see nothing but disaster and catastrophe in store for the human race, and perhaps all other forms of life on Earth, unless people change their wicked ways—at once. ...

PHILLIP J. WINGATE

1992-03-09T23:59:59.000Z

397

Earth Day Redux  

Science Journals Connector (OSTI)

Earth Day Redux ... Thirty years ago this month, as a young reporter at Chemical & Engineering News , I was assigned to write the lead News of the Week story on the very first Earth Day—April 22,1970. ... Here's the lead of that 1970 C&EN story: "Millions of people were expected to participate in protests against their polluted heritage as the much heralded and politically popular environmental movement picked up steam last week and culminated Wednesday in Earth Day. ...

MADELEINE JACOBS

2000-04-24T23:59:59.000Z

398

Lab celebrates Earth Day  

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

Lab celebrates Earth Day Community Connections: Your link to news and opportunities from Los Alamos National Laboratory Latest Issue: Dec. 2014 - Jan. 2015 All Issues submit Lab...

399

South Florida Sun-Sentinel.com Venus to cross sun in rare celestial event  

E-Print Network [OSTI]

South Florida Sun-Sentinel.com Venus to cross sun in rare celestial event By Robert Nolin, Sun passage across the face of the sun at twilight Tuesday. It's a sight you'll never see again. Called named for the Roman goddess of love will pass between the Earth and the sun for several hours at sunset

Belogay, Eugene A.

400

Evolution of Life on Earth EVOLUTION OF LIFE ON EARTH  

E-Print Network [OSTI]

Evolution of Life on Earth #12;EVOLUTION OF LIFE ON EARTH #12;Earth ~4.5 billion years ago A bad day .... #12;Old (Archean) Rocks #12;4.4 Billion year old Zircon Earth was temperate and had water 4.4 billion years ago! #12;#12;EVOLUTION OF LIFE ON EARTH #12;Making Organic Molecules : Miller & Urey Famous

Shirley, Yancy

Note: This page contains sample records for the topic "rare earth materials" 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

Chapter 6: Materials  

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

: Materials : Materials Material Selection Sustainable Building Materials System Integration Issues | Chapter 6 Material Selection Materials The use of durable, attractive, and environmentally responsible building materials is a key element of any high-performance building effort. The use of natural and healthy materials contributes to the well-being of the occupants and to a feeling of connection with the bounty of the natural world. Many construction materials have significant environ- mental impacts from pollutant releases, habitat destruc- tion, and depletion of natural resources. This can occur during extraction and acquisition of raw materials, pro- "Then I say the Earth belongs to duction and manufacturing processes, and transporta- tion. In addition, some construction materials can harm

402

CMI Education Resources for K-12 | Critical Materials Institute  

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

in the activity guide available online. David Pogue also did a PBS NOVA video "Rare Earth Elements" howtosmile.org claims to have all the best science and math activities. Try...

403

Earth Day event showcases LANL energy work  

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

Earth Day showcases energy work Earth Day showcases energy work Earth Day event showcases LANL energy work The public is invited to learn about projects in energy conservation, generation, research, and management at an Energy Town Hall April 21. April 19, 2010 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Contact

404

Earth Week event all about energy  

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

Earth Week event all about energy Earth Week event all about energy Earth Week event all about energy People all across Northern New Mexico can learn about how they can play a role in energy research and energy and fuel conservation at an upcoming Energy Town Hall. April 16, 2009 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.

405

carleton.ca Earth Sciences  

E-Print Network [OSTI]

carleton.ca Earth Sciences #12;Earth is our home. It is a dynamic planet, integrating and recording spectrometers or electron microprobes--earth scientists investigate Earth's evolution to help understand future today and for the future is enhanced by the expertise of economic geologists. Knowledge of the Earth

Dawson, Jeff W.

406

Cool Earth Solar  

ScienceCinema (OSTI)

In a public-private partnership that takes full advantage of the Livermore Valley Open Campus (LVOC) for the first time, Sandia National Laboratories and Cool Earth Solar have signed an agreement that could make solar energy more affordable and accessible. In this piece, representatives from Sandia, Cool Earth Solar, and leaders in California government all discuss the unique partnership and its expected impact.

Lamkin, Rob; McIlroy, Andy; Swalwell, Eric; Rajan, Kish

2014-02-26T23:59:59.000Z

407

Earth Day 2010: Earth Day 40th Anniversary Poster  

E-Print Network [OSTI]

EGJ Issue 30 Earth Day 2010 ISSN 1076-7975 In celebration of 40 Earth Day the Electronic GreenEconomics, Poznan, Poland. Earth image used from www.sxc.hu.

Nowacka, Izabela

2010-01-01T23:59:59.000Z

408

Earth, Space Sciences  

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

Earth, Space Sciences Earth, Space Sciences /science-innovation/_assets/images/icon-science.jpg Earth, Space Sciences National security depends on science and technology. The United States relies on Los Alamos National Laboratory for the best of both. No place on Earth pursues a broader array of world-class scientific endeavors. Climate, Ocean and Sea Ice Modeling (COSIM)» Earth A team of scientists is working to understand how local changes in hydrology might bring about major changes to the Arctic landscape, including the possibility of a large-scale carbon release from thawing permafrost. Bryan Travis, an expert in fluid dynamics, is author of the Mars global hydrology numerical computer model, or MAGHNUM, used for calculating heat and fluid transport phenomena. (MAGHNUM was previously

409

Earth's Core Hottest Layer  

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

Earth's Core Hottest Layer Earth's Core Hottest Layer Name: Alfred Status: Grade: 6-8 Location: FL Country: USA Date: Spring 2011 Question: Why is the inner core the hottest layer? How is that possible? Replies: There are two factors causing the center of the Earth hotter than various layers of the Earth's. First, the more dense is the layer. The denser layer, the hotter it will be. In addition, the source of the heating is due to heat produced by nuclear decay. These substances tend to be more dense than lower dense substances. So the source of heat (temperature) is higher, the greater will be the temperature. Having said all that, the reasons are rather more complicated in the "real" Earth. If the inner layers were less dense they would rise (bubble) to the "surface" leaving the inner layers more dense and thus hotter layers.

410

Earth & Environmental Science  

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

Earth & Environmental Science Earth & Environmental Science Earth & Environmental Science1354608000000Earth & Environmental ScienceSome of these resources are LANL-only and will require Remote Access./No/Questions? 667-5809library@lanl.gov Earth & Environmental Science Some of these resources are LANL-only and will require Remote Access. Key Resources Reference Data Sources Organizations Journals Key Resources AGRICOLA The catalog and index to the collections of the National Agricultural Library, as well as a primary public source for world-wide access to agricultural information. BioOne A global, not-for-profit collaboration bringing together scientific societies, publishers, and libraries to provide access to critical, peer-reviewed research in the biological, ecological, and environmental

411

with Earth's Theia component; thus, it is present-ly not possible to obtain information on D17  

E-Print Network [OSTI]

with Earth's Theia component; thus, it is present- ly not possible to obtain information on D17 O of the proto-Earth. An alternative explanation for the isotope difference between Earth and the Moon is that the D17 O value of Earth was modified by late- accreting material (late veneer) after the for- mation

Napp, Nils

412

Celebrate Earth Day with ACS  

Science Journals Connector (OSTI)

Celebrate Earth Day with ACS ... Winners of the ACS-sponsored Earth Day 2004 music video contest are reported. ... ACS resources for celebrating the Earth Day 2005 theme, "Air—Here, There, Everywhere", are discussed. ...

Erica K. Jacobsen

2005-03-01T23:59:59.000Z

413

Materials use in electricity generators in wind turbines – state-of-the-art and future specifications  

Science Journals Connector (OSTI)

Abstract The European Strategic Energy Technology Plan, adopted by the European Union in 2008, is a first step to establish an energy technology policy for Europe and to support the 2020 energy and climate change targets from the technology development point of view. One of its initiatives is to assess the characteristics of the materials that will be needed in order to achieve the 2020 targets, in terms both of amounts of materials and their technical specifications, along with the way to get there for the latter. The Materials Initiative was created to foster a roadmap which is based on a scientific assessment of the current situation. This paper presents the work of the author in the (wind turbine) electricity generator part of that assessment, it includes the aspects of technology and system state-of-the-art; material supply status; on-going research and players; materials specification targets for 2020/2030 and beyond. The assessment found that the performance of permanent magnets is the single item potentially to provide the most significant improvement in component specification, but that in order to achieve this perhaps new chemical components –based on rare earths, as currently, or not-will be necessary in order to achieve these high-performance magnets. The search for these new materials is stimulated by the current dependency of the world in a nearly-monopolistic supplier of rare earth elements. The assessment also concluded that the improvement of materials specifications is challenging but achievable in most areas, and a crucial aspect for the necessary cost reductions in wind energy production.

Roberto Lacal-Arántegui

2015-01-01T23:59:59.000Z

414

Nature: Earth's Atmosphere and Beyond  

Science Journals Connector (OSTI)

Nature: Earth's Atmosphere and Beyond ... The column summarizes research articles from Nature that report on anthropogenic activities and natural phenomena that influence the chemical composition of Earth's atmosphere. ...

Sabine Heinhorst; Gordon Cannon

2003-10-01T23:59:59.000Z

415

Earth Sciences | More Science | ORNL  

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

fully coupled, and intermodel comparison are underway. Moving forward, Earth system models that imbed a stochastic representation of variable Earth system behavior such...

416

Critical Materials and Rare Futures: Ames Laboratory Signs a...  

Energy Savers [EERE]

and lasers, as well as clean-energy technologies such as electric vehicles and wind turbines. For example, the best magnets for efficient electric motors - which can be found...

417

Life on Earth. II The Hadean Earth  

E-Print Network [OSTI]

on Earth ·Does not need Oxygen or CO2 ·Does not need to metabolize Carbon ·Does not need Sunlight ·Can Smokers Mid-ocean hydrothermal vents (geysers) ·Temperature >100C (to 400C) ·Spew iron and sulfides for biochemistry ·Hydrothermal vents provide nutrients ·Protected from surface impacts #12;Earliest Life ·May have

Walter, Frederick M.

418

Alkaline earth filled nickel skutterudite antimonide thermoelectrics  

DOE Patents [OSTI]

A thermoelectric material including a body centered cubic filled skutterudite having the formula A.sub.xFe.sub.yNi.sub.zSb.sub.12, where A is an alkaline earth element, x is no more than approximately 1.0, and the sum of y and z is approximately equal to 4.0. The alkaline earth element includes guest atoms selected from the group consisting of Be, Mb, Ca, Sr, Ba, Ra and combinations thereof. The filled skutterudite is shown to have properties suitable for a wide variety of thermoelectric applications.

Singh, David Joseph

2013-07-16T23:59:59.000Z

419

Earth's Global Energy Budget  

Science Journals Connector (OSTI)

An update is provided on the Earth's global annual mean energy budget in the light of new observations and analyses. In 1997, Kiehl and Trenberth provided a review of past estimates and performed a number of radiative computations to better ...

Kevin E. Trenberth; John T. Fasullo; Jeffrey Kiehl

2009-03-01T23:59:59.000Z

420

LANL Studies Earth's Magnetosphere  

ScienceCinema (OSTI)

A new 3-D supercomputer model presents a new theory of how magnetic reconnection works in high-temperature plasmas. This Los Alamos National Laboratory research supports an upcoming NASA mission to study Earth's magnetosphere in greater detail than ever.

Daughton, Bill

2014-08-12T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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

Alexandria Digital Earth ProtoType The Alexandria Digital Earth  

E-Print Network [OSTI]

Alexandria Digital Earth ProtoType The Alexandria Digital Earth Prototype System Terence Smith Greg Janée James Frew Anita Coleman #12;Alexandria Digital Earth ProtoType 2Smith et al. / JCDL 2001 / 2x Earth ProtoType 3Smith et al. / JCDL 2001 / 2x-Jun-2001 Core System (inherited from ADL) Components

Janée, Greg

422

Physical Earth Science Is Physical Earth Science right for me?  

E-Print Network [OSTI]

Physical Earth Science Is Physical Earth Science right for me? If you are interested in learning a Physical Earth Science degree. The skills you will gain are wide-ranging and will provide a good basis for employment in almost any sector. Are all Physical Earth Science degrees the same? Universities do not have

Harman, Neal.A.

423

The Sun-Earth Connection The Temperature of the Earth  

E-Print Network [OSTI]

AST248 The Sun-Earth Connection #12;The Temperature of the Earth The Earth is in equilibrium with the Sun - on average it is neither heating nor cooling. The equilibrium temperature is set by equating ­ the heat absorbed from the Sun with ­ the heat radiated by the Earth. Heat in = heat out #12;Heat

Walter, Frederick M.

424

NREL Highlights SCIENCE Research provides insight for exploring use of Earth-  

E-Print Network [OSTI]

NREL Highlights SCIENCE Research provides insight for exploring use of Earth- abundant quaternary, it is critical to find new material that is Earth abundant and easily manufactured. Previous experimental studies This research provides insight for exploring use of Earth-abundant quaternary semiconductors for large

425

An Equilibrium Model of Rare Event Premia  

E-Print Network [OSTI]

In this paper, we study the asset pricing implication of imprecise knowledge about rare events. Modeling rare events as jumps in the aggregate endowment, we explicitly solve the equilibrium asset prices in a pure-exchange ...

Liu, Jun

2002-08-12T23:59:59.000Z

426

Rare Iron Oxide in Ancient Chinese Pottery  

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

Rare Iron Oxide in Ancient Chinese Pottery Rare Iron Oxide in Ancient Chinese Pottery Print Friday, 26 September 2014 14:37 Jian ware (or Tenmoku) ceramic bowls, famous for their...

427

The Earth and the IGY  

Science Journals Connector (OSTI)

The Earth and the IGY ... "The Earth and Its Atmosphere" will bring you up to date in all the main branches of these related studies: the earth's crust and interior; the circulation of the oceans; meteorology and the composition and structure of the atmosphere; atoms and magnetic storms, and the origin, age, and ultimate fate of the earth. ...

1958-10-27T23:59:59.000Z

428

Earth Sciences report, 1989--1990  

SciTech Connect (OSTI)

The Earth Sciences Department at Lawrence Livermore National Laboratory (LLNL) conducts work in support of the Laboratory's energy, defense, environmental, and basic research programs. The Department comprises more than 100 professional scientific personnel spanning a variety of subdisciplines: geology, seismology, physics, geophysics, geochemistry, geohydrology, chemical engineering, and mechanical engineering. Resident technical support groups add significant additional technical expertise, including Containment Engineering, Computations, Electronic Engineering, Mechanical Engineering, Chemistry and Materials Science, and Technical Information. In total, approximately 180 professional scientists and engineers are housed in the Earth Sciences Department, making it one of the largest geo-science research groups in the nation. Previous Earth Sciences reports have presented an outline of the technical capabilities and accomplishments of the groups within the Department. In this FY 89/90 Report, we have chosen instead to present twelve of our projects in full-length technical articles. This Overview introduces those articles and highlights other significant research performed during this period.

Younker, L.W.; Peterson, S.J.; Price, M.E. (eds.)

1991-03-01T23:59:59.000Z

429

Earth Day 2014 | Department of Energy  

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

Earth Day 2014 Earth Day 2014 Earth Day 2014 This year, we're celebrating Earth Day all week long. It's Earth Week on Energy.gov We're focusing on climate change, highlighting...

430

Seminars 2012 - Argonne National Laboratories, Materials Sicence Division  

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

2 2 Materials Science 2012 Seminar Archive January January 13th - Ming Tang Lawrence Livermore National Laboratory Stress-Diffusion Coupling in Olivine Cathodes for Li-ion Batteries January 16th - Jonathan Keeling University of St. Andrews, United Kingdom Condensation, superfluidity, and lasing of coupled light-matter systems January 23rd - Wade DeGottardi University of Illinois at Urbana-Champaign Majorana fermions in a spin-ladder system January 23rd - Sergey Artyukhin Moscow Institute of Physics and Technology Solitonic Arrays and Magnetoelectric Switching in Rare Earth Orthoferrites January 25th - Geoffrey Oxberry Massachusetts Institute of Technology Advances in the Model Reduction of Chemistry for Reacting Flow Simulations January 27th - Tianheng Han Massachusetts Institute of Technology

431

Qing'an Li - Argonne National Laboratories, Materials Sicence Division  

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

EM > Qing'an Li EM > Qing'an Li Qing'an Li Scientific Associate Sr Bldg. 223, A-113 Phone: 630-252-3996 This e-mail address is being protected from spambots. You need JavaScript enabled to view it. Biography Qing'an Li was an Assistant Research Scientist at Institute of Physics, Chinese Academy of Sciences after receiving his doctorate in July 1993 working on superconducting electronics. He was a postdoctoral fellow at University of Tokyo, Japan working on superconducting electronics in 1996. In 1997, he became a Visiting Scientist (postdoc) at the Materials Science Division of the Argonne National Laboratory, and started to study the transport properties of colossal magnetoresistance (CMR) materials in the Emerging Materials group. At the Institute of Physics, Chinese Academy of Sciences, Li was an Associated Research Scientist in 2000, a Research scientist, and Professor in 2001, working on magnetic and transport properties of transition metal oxides. In 2006, he visited the Materials Science Division of the Argonne National Laboratory as a Visiting Scientist, working on the transport properties of intermetallic compounds of rare-earth and transition metals, transition metal oxides, etc. and became a Scientific Associate Sr. in Emerging Materials group in 2009.

432

The Colorado Rare Plant Technical Committee presents: Colorado Rare Plant Symposium  

E-Print Network [OSTI]

The Colorado Rare Plant Technical Committee presents: 5th Annual Colorado Rare Plant Symposium September 5, 2008 Montrose, Colorado Sponsored by: Colorado Rare Plant Technical CommitteeColorado Rare Plant Technical Committee Colorado Native Plant Society University of Colorado Herbarium US Fish

433

The Colorado Rare Plant Technical Committee presents: 2nd Annual Rare Plant  

E-Print Network [OSTI]

The Colorado Rare Plant Technical Committee presents: 2nd Annual Rare Plant Symposium Friday, September 16th, 2005 8am-noon: 2nd Annual Colorado Rare Plant Symposium (Discuss G1 species) 6:30-7:30pm with the Colorado Native Plant Society's Annual Meeting Sponsored by: #12;The Second Annual Colorado Rare Plant

434

Modeling the earth system  

SciTech Connect (OSTI)

The 1990 Global Change Institute (GCI) on Earth System Modeling is the third of a series organized by the Office for Interdisciplinary Earth Studies to look in depth at particular issues critical to developing a better understanding of the earth system. The 1990 GCI on Earth System Modeling was organized around three themes: defining critical gaps in the knowledge of the earth system, developing simplified working models, and validating comprehensive system models. This book is divided into three sections that reflect these themes. Each section begins with a set of background papers offering a brief tutorial on the subject, followed by working group reports developed during the institute. These reports summarize the joint ideas and recommendations of the participants and bring to bear the interdisciplinary perspective that imbued the institute. Since the conclusion of the 1990 Global Change Institute, research programs, nationally and internationally, have moved forward to implement a number of the recommendations made at the institute, and many of the participants have maintained collegial interactions to develop research projects addressing the needs identified during the two weeks in Snowmass.

Ojima, D. [ed.

1992-12-31T23:59:59.000Z

435

PrintRes_PeriodicChartPostCard2014  

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

Rare Earths - Research - Knowledge resources - High-purity metals & materials Rare earth elements are critical components of clean energy technologies like high-tech...

436

Lab celebrates Earth Day  

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

Lab celebrates Earth Day Lab celebrates Earth Day Community Connections: Our link to Northern New Mexico Communities Latest Issue:Dec. 2013 - Jan. 2014 All Issues » submit Lab celebrates Earth Day Multiple activities focus on environmental protection. May 1, 2013 A team from Industrial Hygiene and Safety during the Great Garbage Grab A team from Industrial Hygiene and Safety during the Great Garbage Grab. Contact Editor Linda Anderman Email Community Programs Office Kurt Steinhaus Email Great Garbage Grab From April 1 - 12 employees were encouraged to don work gloves and very attractive orange vests to pick up litter around their workplace-both on and off Lab property. This year's winner of the coveted Traveling Trash Trophy (for picking up the most litter) went to the Worker Safety and

437

Spectral Modulation of Upconversion Emissions with Composition Tuning and Surface Plasmonic Resonance  

E-Print Network [OSTI]

sodium, fluorine and rare-earth elements. The carbon signalEnergy levels of rare earth elements and the energy transferbetween two centers. 1 Rare earth element doped materials

Zhang, Hua

2013-01-01T23:59:59.000Z

438

Characterization of Light Scattering in Transparent Polycrystalline Laser Ceramics  

E-Print Network [OSTI]

materials doped with rare earth elements (active ions), withmaterial (i.e. , rare earth elements such as Yb, Nd, Tm, Ho,active (e.g. ,, the rare earth elements such as Nd, Yb, Tm,

Sharma, Saurabh

2013-01-01T23:59:59.000Z

439

Chapter 4 - Recycling Rare Metals  

Science Journals Connector (OSTI)

Abstract The industrial system now utilizes many more elements, especially rare metals, than was the case even a half century ago. Most are not mined for themselves but are obtained as by-products or “hitchhikers” of the more familiar industrial metals, such as iron, aluminum, copper, nickel, and zinc. This imposes a limit on the production of by-product metals. But in some cases, demand may increase much faster than new supply. This suggests a need for recycling. But the uses of these metals are often in products, such as cell phones, that are mass-produced but where the amount in each individual product is very small. Some uses are also inherently dissipative. This makes recycling very difficult in principle. It constitutes a serious challenge for the future economy. Prices will rise.

Robert U. Ayres; Gara Villalba Méndez; Laura Talens Peiró

2014-01-01T23:59:59.000Z

440

Field measurements of lateral earth pressures on a pre-cast panel retaining wall  

E-Print Network [OSTI]

Test Wall Description Instrumentation Installation of Pressure Cells and Transducers Backfilling Procedure Properties of the Backfill Material Placement of Clay Backfill DATA COLLECTION Earth Pressure Cell Measurements Force Transducer... Analysis of Backfill Material 2 Lateral Earth Pressures Measured by Pressure Cells (Psi) . . . . . . . . . . . - . ~ . ~ 3 Maximum Deviation From Zero Gage Reading and Temperature Relationship. . . . 4 Forces Measured by Force Transducers (Kips) 5...

Prescott, David Monroe

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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

Alkaline earth cation extraction from acid solution  

DOE Patents [OSTI]

An extractant medium for extracting alkaline earth cations from an aqueous acidic sample solution is described as are a method and apparatus for using the same. The separation medium is free of diluent, free-flowing and particulate, and comprises a Crown ether that is a 4,4'(5')[C.sub.4 -C.sub.8 -alkylcyclohexano]18-Crown-6 dispersed on an inert substrate material.

Dietz, Mark (Elmhurst, IL); Horwitz, E. Philip (Naperville, IL)

2003-01-01T23:59:59.000Z

442

Simulations Reveal That Earth's Silica Is Predominantly Superficial - NERSC  

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

Reveal Reveal Earth's Silica Is Predominantly Superficial Simulations Reveal Earth's Silica Is Predominantly Superficial May 24, 2010 Silica is one of the most common minerals on Earth. Not only does it make up two-thirds of our planet's crust, it is also used to create a variety of materials from glass to ceramics, computer chips and fiber optic cables. Yet new quantum mechanics results generated by a team of physicists from Ohio State University (OSU) show that this mineral only populates our planet superficially-in other words, silica is relatively uncommon deep within the Earth. Cross-section of the Earth Using several of the largest supercomputers in the nation, including the National Energy Research Scientific Computing Center's (NERSC) Cray XT4 "Franklin" system, the team simulated the behavior of silica in

443

Earth Democracy: Justice, Sustainability, and Peace  

E-Print Network [OSTI]

Review: Earth Democracy: Justice, Sustainability, and PeaceUniversity, USA Vandana Shiva. Earth Democracy: Justice,Acid-free, recycled paper. Earth Democracy is a movement

Anderson, Byron

2006-01-01T23:59:59.000Z

444

19 - Natural disasters and earth buildings: resistant design and construction  

Science Journals Connector (OSTI)

Abstract: Earth buildings are particularly vulnerable to earthquakes, tropical storms, major wind storms and floods; the risks, causal mechanisms and failure modes for these natural hazards are described. Thousands die each year due to unreinforced earth building collapses in earthquakes; designers must assess the hazard, ground conditions and seismic lateral loads and use suitable structural forms and reinforcement. Unstabilised earth materials are highly susceptible to flood inundation requiring site consideration; in severe winds the low tensile strength requires special attention especially to the roof tie-down anchorage. The risks from other natural hazards are overviewed and the design principles are discussed.

H.W. Morris

2012-01-01T23:59:59.000Z

445

Chapter 32: Beyond the earth  

E-Print Network [OSTI]

1 Chapter 32: Beyond the earth Did you read chapter 32 before coming to class? A. Yes B the planets. We began our study of the history of the solar system by studying the history of the earth decreased. How about the rest of the solar system? Some stats on the Sun Time for light to reach Earth · 8

Hart, Gus

446

Happy B-Earth Day  

Science Journals Connector (OSTI)

Happy B-Earth Day ... n April 22, 1970, the U.S. celebrated its first Earth Day. ... Internationally, the Vernal Equinox (often March 20) had been recognized for Earth Day starting in 1969, and the U.N. made official that recognition in 1971. ...

Darcy J. Gentleman

2010-03-30T23:59:59.000Z

447

Earth Day Illustrated Haiku Contest  

Science Journals Connector (OSTI)

Earth Day Illustrated Haiku Contest ... Chemists Celebrate Earth Day: "Recycling—Chemistry Can! ... As part of their 2007 Chemists Celebrate Earth Day Celebration, the American Chemical Society is sponsoring an illustrated haiku contest for students in grades K–12 around the theme, Recycling—Chemistry Can! ...

JCE staff

2007-02-01T23:59:59.000Z

448

Mines Welcomes Middle School Students | Critical Materials Institute  

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

of Science and Technology. The students spent the day at Mines to learn about Earth, energy, the environment, critical materials and mining. The students enjoyed a chemistry show...

449

Rare is frequent and frequent is costly: rare diseases as a challenge for health care systems  

Science Journals Connector (OSTI)

Of 30,000 known diseases about 6,000–7,000 are defined as rare diseases, also commonly known as orphan diseases [1]. Within the European Union (EU), rare diseases are specified as indications with a prevalence of...

J.-Matthias Graf von der Schulenburg…

2014-10-01T23:59:59.000Z

450

Man on Earth  

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

Man on Earth Man on Earth Name: jmagee Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 Question: How long has man as a species existed on the planet? Replies: Human evolution is a matter of considerable debate. Since the phrase in the question, "man as a species," is a bit vague, here is a brief run-down of the fossil evidence for the evolution of hominids (animals able to walk upright): Australopithecus - the first hominid, appeared on the African savannas 2-3 million years ago. Brain size was 1/3 modern human's. Homo habilis - the first hominid to make and use tools. Homo erectus - a. k. a. Peking and Java man, evolved from Homo habilis about 1.5 million years ago, built fires, resided in huts, and had a brain capacity of 1,000 ml (versus modern man's 1,375 ml).

451

Understanding Earth's Energy Sources  

K-12 Energy Lesson Plans and Activities Web site (EERE)

In Part 1, students will know how fossil fuels were formed; recognize common uses of Earth’s fossil energy resources and develop an understanding of the risks and benefits of their continued use. In Part 2, students focus on the importance of renewable energy resources for a sustainable future. Current renewable energy technologies (solar, wind, biomass, hydrogen, hydroelectric, and geothermal) are discussed. Information on solar is located on a separate power point (2006 Solar PP) as is hydrogen and transportation alternatives. Students will be able to distinguish between renewable and nonrenewable energy resources and identify the positive and negative effects of each. The long-term understanding of this unit is for the students to make informed energy decisions in the future.

452

Earth's Decelerating Tectonic Plates  

SciTech Connect (OSTI)

Space geodetic and oceanic magnetic anomaly constraints on tectonic plate motions are employed to determine a new global map of present-day rates of change of plate velocities. This map shows that Earth's largest plate, the Pacific, is presently decelerating along with several other plates in the Pacific and Indo-Atlantic hemispheres. These plate decelerations contribute to an overall, globally averaged slowdown in tectonic plate speeds. The map of plate decelerations provides new and unique constraints on the dynamics of time-dependent convection in Earth's mantle. We employ a recently developed convection model constrained by seismic, geodynamic and mineral physics data to show that time-dependent changes in mantle buoyancy forces can explain the deceleration of the major plates in the Pacific and Indo-Atlantic hemispheres.

Forte, A M; Moucha, R; Rowley, D B; Quere, S; Mitrovica, J X; Simmons, N A; Grand, S P

2008-08-22T23:59:59.000Z

453

LamontDoherty Earth Observatory The Earth Institute at Columbia UniversityThe Earth Institute at Columbia Univ  

E-Print Network [OSTI]

12 12 Lamont­Doherty Earth Observatory The Earth Institute at Columbia UniversityThe Earth-DOHERTYEARTHOBSERVATORYTHEEARTHINSTITUTEATCOLUMBIAUNIVERSITYBIENNIALREPORT2000­2002 #12;Lamont-Doherty Earth Observatory is renowned in the internationLamont-Doherty Earth suc- cess and innovation in advancing understanding of Earth, for itcess and innovation in advancing

454

Superhydrophobic diatomaceous earth  

DOE Patents [OSTI]

A superhydrophobic powder is prepared by coating diatomaceous earth (DE) with a hydrophobic coating on the particle surface such that the coating conforms to the topography of the DE particles. The hydrophobic coating can be a self assembly monolayer of a perfluorinated silane coupling agent. The DE is preferably natural-grade DE where organic impurities have been removed. The superhydrophobic powder can be applied as a suspension in a binder solution to a substrate to produce a superhydrophobic surface on the substrate.

Simpson, John T. (Clinton, TN); D'Urso, Brian R. (Clinton, TN)

2012-07-10T23:59:59.000Z

455

Earth System History Announcements  

E-Print Network [OSTI]

of atoms in them. Something like 10 parts-per-million of Uranium in granite = 6.83 x 1027 atoms of Uranium radioactivity in it #12;3 cm A simple piece of granite has atoms of Uranium, Thorium and Potassium N D D D D D #12;Deep time is a central concept in Geology and in our understanding of how the Earth

Mojzsis, Stephen J.

456

Nuclear-quadrupole optical hole burning in the stoichiometric material EuP5O14  

Science Journals Connector (OSTI)

Hole burning, which is attributed to optical pumping of nuclear-quadrupole levels, has been observed in the stoichiometric rare-earth compound, EuP5O14. The long...

Macfarlane, R M; Genack, A Z; Weitz, D A; Shelby, R M

1980-01-01T23:59:59.000Z

457

The Colorado Rare Plant Technical Committee presents  

E-Print Network [OSTI]

The Colorado Rare Plant Technical Committee presents: 3rd Annual Rare Plant Symposium Sponsored by: Colorado Native Plant Society University of Colorado Herbarium US Fish and Wildlife Service Colorado and Eastern Colorado (Las Animas, Weld, Kit Carson, Huerfano, Pueblo, Otero, Prowers, Fremont, and El Paso

458

Stark spectroscopy on rare gas atoms  

E-Print Network [OSTI]

Stark spectroscopy on rare gas atoms PROEFSCHRIFT ter verkrijging van de graad van doctor aan de-DATA LIBRARY TECHNISCHE UNIVERSITEIT EINDHOVEN Jiang, Tao Stark spectroscopy on rare gas atoms / by Tao Jiang / gasontladingen Subject headings : plasma diagnostics / Stark effect / optogalvanic spectroscopy / atomic emission

Eindhoven, Technische Universiteit

459

Chemical Properties of the Rare Gases  

Science Journals Connector (OSTI)

... of argon of about 100 atm. I have already shown by an independent method1 that radon, too, forms a hydrate which is much more stable than those of other rare ... , forms a hydrate which is much more stable than those of other rare gases. Radon is easily held by crystals of sulphur dioxide hydrates, when they are formed from ...

B. A. NIKITIN

1937-10-09T23:59:59.000Z

460

4/22/11 10:54 AMEarth Day: Environmental education has failed. But we can fix it. -CSMonitor.com Page 1 of 3http://www.csmonitor.com/Commentary/Opinion/2011/0422/Earth-Day-Environmental-education-has-failed.-But-we-can-fix-it#comments  

E-Print Network [OSTI]

the Earth for fossil fuels and rare earth elements, pumped more and more CO2 into the atmosphere.com Page 1 of 3http://www.csmonitor.com/Commentary/Opinion/2011/0422/Earth-Day-Environmental-education-has-failed.-But-we-can-fix-it#comments Try a FREE 30 day preview of Daily News Briefing Gallery: Earth Day 2011 Related Stories Happy Earth

Note: This page contains sample records for the topic "rare earth materials" 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.


461

Studying Materials Under Extreme Pressure  

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

Studying Materials Under Extreme Pressure Studying Materials Under Extreme Pressure Coupling undulator radiation from Advanced Photon Source (APS) beamlines 3-ID and 13-ID to nuclear resonant inelastic scattering techniques, researchers have determined the phonon density of states for iron under pressures up to 153 gigapascals, equivalent to those found at the Earth's core. Image of the Earth's core. Although indirect measurements and theory have, since the early 1950s, produced an informed picture of the structure and composition of the materials that make up the core of the Earth, direct proof and the answers to some intriguing questions remain unanswered. Previously, ultrahigh-pressure experiments using nuclear resonant inelastic scattering have been difficult to carry out due the tiny samples required.

462

Earth's extensive entropy bound  

E-Print Network [OSTI]

The possibility of planetary mass black hole production by crossing entropy limits is addressed. Such a possibility is given by pointing out that two geophysical quantities have comparable values: first, Earth's total negative entropy flux integrated over geological time and, second, its extensive entropy bound, which follows as a tighter bound to the Bekenstein limit when entropy is an extensive function. The similarity between both numbers suggests that the formation of black holes from planets may be possible through a strong fluctuation toward thermodynamic equilibrium which results in gravothermal instability and final collapse. Briefly discussed are implications for the astronomical observation of low mass black holes and for Fermi's paradox.

A. M. Lisewski

2012-12-20T23:59:59.000Z

463

A Star on Earth  

ScienceCinema (OSTI)

At the Energy Department's Princeton Plasma Physics Lab, scientists are trying to accomplish what was once considered the realm of science fiction: create a star on Earth. The National Spherical Torus Experiment (NSTX) is a magnetic fusion device that is used to study the physics principles of spherically shaped plasmas -- hot ionized gases in which, under the right conditions, nuclear fusion will occur. Fusion is the energy source of the sun and all of the stars. Not just limited to theoretical work, the NSTX is enabling cutting-edge research to develop fusion as a future energy source.

Prager, Stewart; Zwicker, Andrew; Hammet, Greg; Tresemer, Kelsey; Diallo, Ahmed

2014-06-06T23:59:59.000Z

464

A Star on Earth  

SciTech Connect (OSTI)

At the Energy Department's Princeton Plasma Physics Lab, scientists are trying to accomplish what was once considered the realm of science fiction: create a star on Earth. The National Spherical Torus Experiment (NSTX) is a magnetic fusion device that is used to study the physics principles of spherically shaped plasmas -- hot ionized gases in which, under the right conditions, nuclear fusion will occur. Fusion is the energy source of the sun and all of the stars. Not just limited to theoretical work, the NSTX is enabling cutting-edge research to develop fusion as a future energy source.

Prager, Stewart; Zwicker, Andrew; Hammet, Greg; Tresemer, Kelsey; Diallo, Ahmed

2014-03-05T23:59:59.000Z

465

Magnetic preferential orientation of metal oxide superconducting materials  

DOE Patents [OSTI]

A superconductor comprised of a polycrystalline metal oxide such as YBa[sub 2]Cu[sub 3]O[sub 7[minus]X] (where 0 < X < 0.5) exhibits superconducting properties and is capable of conducting very large current densities. By aligning the two-dimensional Cu-O layers which carry the current in the superconducting state in the a- and b-directions, i.e., within the basal plane, a high degree of crystalline axes alignment is provided between adjacent grains permitting the conduction of high current densities. The highly anisotropic diamagnetic susceptibility of the polycrystalline metal oxide material permits the use of an applied magnetic field to orient the individual crystals when in the superconducting state to substantially increase current transport between adjacent grains. In another embodiment, the anisotropic paramagnetic susceptibility of rare-earth ions substituted into the oxide material is made use of as an applied magnetic field orients the particles in a preferential direction. This latter operation can be performed with the material in the normal (non-superconducting) state. 4 figs.

Capone, D.W.; Dunlap, B.D.; Veal, B.W.

1990-07-17T23:59:59.000Z

466

Magnetic preferential orientation of metal oxide superconducting materials  

DOE Patents [OSTI]

A superconductor comprised of a polycrystalline metal oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-X (where 0material permits the use of an applied magnetic field to orient the individual crystals when in the superconducting state to substantially increase current transport between adjacent grains. In another embodiment, the anisotropic paramagnetic susceptibility of rare-earth ions substituted into the oxide material is made use of as an applied magnetic field orients the particles in a preferential direction. This latter operation can be performed with the material in the normal (non-superconducting) state.

Capone, Donald W. (Bolingbrook, IL); Dunlap, Bobby D. (Bolingbrook, IL); Veal, Boyd W. (Downers Grove, IL)

1990-01-01T23:59:59.000Z

467

A Collisional Origin to Earth's Non-chondritic Composition?  

E-Print Network [OSTI]

Several lines of evidence indicate a non-chondritic composition for Bulk Earth. If Earth formed from the accretion of chondritic material, its non-chondritic composition, in particular the super-chondritic 142Nd/144Nd and low Mg/Fe ratios, might be explained by the collisional erosion of differentiated planetesimals during its formation. In this work we use an N-body code, that includes a state-of-the-art collision model, to follow the formation of protoplanets, similar to proto-Earth, from differentiated planetesimals (> 100 km) up to isolation mass (> 0.16 M_Earth). Collisions between differentiated bodies have the potential to change the core-mantle ratio of the accreted protoplanets. We show that sufficient mantle material can be stripped from the colliding bodies during runaway and oligarchic growth, such that the final protoplanets could have Mg/Fe and Si/Fe ratios similar to that of bulk Earth, but only if Earth is an extreme case and the core is assumed to contain 10% silicon by mass. This may indicat...

Bonsor, Amy; Carter, Philip J; Elliott, Tim; Walter, Michael J; Stewart, Sarah T

2014-01-01T23:59:59.000Z

468

Probing QCD with Rare Charmless $B$ Decays  

SciTech Connect (OSTI)

Rare charmless hadronic B decays are a good testing ground for QCD. In this paper we describe a selection of new measurements made by the BABAR and BELLE collaborations.

Gradl, Wolfgang

2006-07-07T23:59:59.000Z

469

Nuclear Astrophysics in Rare Isotope Facilities  

E-Print Network [OSTI]

Nuclear reactions in stars are difficult to measure directly in the laboratory at the small astrophysical energies. In recent years indirect methods with rare isotopes have been developed and applied to extract low-energy astrophysical cross sections.

C. A. Bertulani

2009-11-02T23:59:59.000Z

470

THE INTERACTION OF RARE GAS METASTABLE ATOMS  

E-Print Network [OSTI]

in the study of metastable atom reactions. > 1 it- Fig, laa raetastable rare gas atom, three quantities are necessaryOF iiARE GAS METASTABLF ATOMS Andrew Zun-Foh Wang M a t e r

Wang, A.Z.-F.

2011-01-01T23:59:59.000Z

471

Rare decays at the LHCb experiment  

E-Print Network [OSTI]

Rare decays of beauty and charm hadrons offer a rich playground to make precise tests of the Standard Model and look for New Physics at the level of quantum corrections. A review of recent LHCb results will be presented.

Luca Pescatore

2014-10-09T23:59:59.000Z

472

Rare earth elements as tracers of sediment contamination by phosphogypsum in the Santos estuary, southern Brazil  

Science Journals Connector (OSTI)

In the Cubatăo region, southern Brazil, sediments are transported by several rivers from the Serra do Mar Ridge into the Santos estuary. Fertilizer plants have been operating along the margins of one of these rivers (Mogi River) producing a large volume of phosphogypsum, which is stockpiled in nearby areas. Surface sediments of the Mogi River were sampled upstream and downstream in relation to the point where the effluents of the phosphogypsum piles flow into the drainage system. In the vicinity of this point one sediment core was collected. Results show that REE, Ba, Zr and Th concentrations in the non-contaminated sediments are of the same order as those present in the upper continental crust. The contaminated samples present a composition affected by that of the phosphogypsum, marked by a higher concentration of these elements and a stronger degree of REE fractionation. These phosphogypsum characteristics are inherited from the Catalăo igneous phosphate ore and were moderately modified by the industrial process of phosphoric acid production. The phosphogypsum signal decreases rapidly downstream, pointing to a limited area of influence of the stacks. The deepest sediments of the core are also free of contamination, representing a time interval prior to the deposition of phosphogypsum wastes on the banks of the estuary.

Sonia Maria Barros de Oliveira; Paulo Sergio Cardoso da Silva; Barbara Paci Mazzilli; Deborah Ines Teixeira Favaro; Catia Heloisa Saueia

2007-01-01T23:59:59.000Z

473

Three-band model for exciton formation in rare-earth compounds  

Science Journals Connector (OSTI)

The possibility of exciton formation is studied in a model which allows for hybridization between a conduction band and a 4f level and which takes into account the scattering of electrons in a band of higher energy on the 4f ion. There is no direct coupling between this latter band and the conduction band. For weak scattering and in the Hartree-Fock approximation an isolated level built up from the 4f and the higher-band states appears. For sufficiently strong scattering this level broadens due to the coupling to the conduction band and becomes partially occupied. The theoretical arguments are supported by numerical calculations.

P. Erdös; J. Sólyom; A. Sütö

1988-11-15T23:59:59.000Z

474

Vehicle Technologies Office Merit Review 2014: Scalable Non-Rare Earth Motor Development  

Broader source: Energy.gov [DOE]

Presentation given by Oak Ridge National Laboratory at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about scalable non...

475

Photoconductivity of chemically deposited rare-earth-doped CdS films  

Science Journals Connector (OSTI)

Highly photosensitive films with photocurrent to dark current ratios of the order of 105 have been prepared by doping CdS with Nd and Pr. The conditions for...

S. Bhushan; Dipti Thakur

1992-03-01T23:59:59.000Z

476

Resonant Inelastic X-ray Scattering of Rare-Earth and Copper Systems  

E-Print Network [OSTI]

100 nm Si 3 N 4 windows 100Ĺ copper films were deposited inthick Si 3 N 4 window, the 100Ĺ Fe film was deposited inis present in the film on the window membrane. Cu 2 O has

Kvashnina, Kristina

2007-01-01T23:59:59.000Z

477

Nuclear-Decay Studies of Neutron-Rich Rare-Earth Nuclides  

E-Print Network [OSTI]

yields from U and C f Chart of nuclides for neutron-richlceVy gales for A=168 Chart of nuclides for region studied A1.2. Region of the chart of nuclides showing the various

Chasteler, R.M.

2010-01-01T23:59:59.000Z

478

Using rare earth elements to constrain particulate organic carbon flux in marginal seas.  

E-Print Network [OSTI]

??Fluxes of particulate organic carbon (POC) in the East China Sea (ECS) have been reported to decrease from the inner continental shelf towards the outer… (more)

Chen, Ya-Feng

2014-01-01T23:59:59.000Z

479

f-f excitations by resonant electron-exchange collisions in rare-earth metals  

Science Journals Connector (OSTI)

The spin-forbidden f-f multiplet excitations are observed for the first time as the strongest features in the electron-energy-loss spectra of Gd, Dy, and Sm metals at low primary-electron energies. The exchange nature of the excitation process is argued, in analogy with that of spin-flip Stoner excitations in d-band ferromagnets. A resonance enhancement observed for primary-electron energies near the 4d-4f core threshold is found to be consistent with the proposed mechanism.

S. Modesti; G. Paolucci; E. Tosatti

1985-12-30T23:59:59.000Z

480

Metal sulfide and rare-earth phosphate nanostructures and methods of making same  

DOE Patents [OSTI]

The present invention provides a method of producing a crystalline metal sulfide nanostructure. The metal is a transitional metal or a Group IV metal. In the method, a porous membrane is placed between a metal precursor solution and a sulfur precursor solution. The metal cations of the metal precursor solution and sulfur ions of the sulfur precursor solution react, thereby producing a crystalline metal sulfide nanostructure.

Wong, Stanislaus; Zhang, Fen

2014-05-13T23:59:59.000Z

Note: This page contains sample records for the topic "rare earth materials" 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.


481

Rare earth : geomantic formulae for the production of works of art  

E-Print Network [OSTI]

This thesis describes the development of my study of the influence of chinese geomancy on my art. The emphasis is on art forms created for the transportation of my mind to the audience within encompassing space and sculpted ...

Chan-Bernard, Mei-ling

1990-01-01T23:59:59.000Z

482

Measuring Low Dimensional Schottky Barriers of Rare Earth Silicide-Silicon Interfaces.  

E-Print Network [OSTI]

??The focus of this study is the measurement of low dimensional Schottky barrier heights of metal silicide-silicon interfaces and the challenges of current-voltage (I/V) curve… (more)

Vick, Andrew J

2011-01-01T23:59:59.000Z

483

Proximal surface caries detection with direct-exposure and rare earth screen/film imaging  

SciTech Connect (OSTI)

This laboratory study compared five imaging systems for their diagnostic accuracy in detection of proximal surface dental caries. Ten viewers provided data on radiographic detectability of carious lesions. The diagnostic accuracy of each system was determined with receiver operating characteristic (ROC) curves by comparing viewer data with the true state of the teeth as determined microscopically. D-speed film marginally outperformed the other four systems, but the three screen/film systems matched the diagnostic accuracy of E-speed film. Radiation reductions between 62% and 92% were achieved with the screen/film systems when compared to the two conventional dental films. The feasibility of designing a screen/film bite-wing cassette was shown, but the poor diagnostic accuracy of the present bite-wing system indicated a need for a new technology in caries detection.

Lundeen, R.C.; McDavid, W.D.; Barnwell, G.M.

1988-12-01T23:59:59.000Z

484

The role of f electrons in rare-earth and uranium intermetallics  

SciTech Connect (OSTI)

Electronic structures of Nd{sup 3+} and U{sup 3+} icon NdNi{sub 5} and UPd{sub 2}Al{sub 3} intermetallic compounds have been discussed. The strong correlation between the charge distribution at vicinity of the f-shell electrons and the magnetic state of the f electron subsystem of these Kramers icons has been underlined. The formation of the local magnetic moment, of the ordered magnetic state, of the singlet ground state and of the energy gap in the ordered state is evaluated in conjugation with the temperature dependence of the energy level scheme. It is argued that as a functions of the charge distribution and the spin-dependent interactions many exotic properties are expected resembling those found in heavy-fermion compounds.

Radwanski, R.J. [Centre for Solid State Physics, Krakow (Poland)] [Centre for Solid State Physics, Krakow (Poland)

1994-03-01T23:59:59.000Z

485

The progress of TiO2 nanocrystals doped with rare earth ions  

Science Journals Connector (OSTI)

In the past decades, TiO2 nanocrystals (NCs) have been widely studied in the fields of photoelectric devices, optical communication, and environment for their stability in aqueous solution, being nontoxic, cheapness, and so on. Among the three ...

Hai Liu; Lixin Yu; Weifan Chen; Yingyi Li

2012-01-01T23:59:59.000Z

486

The rare earth element distribution over Europe: geogenic and anthropogenic sources  

Science Journals Connector (OSTI)

...increased risk of liver and bone cancer. REE toxicity has been investigated...such as seawater tends to be depleted in Ce on REE plots. The FOREGS...very similar to that of high uranium values described by Plant et...G., The distribution of uranium over Europe: geological and...

L. Fedele; J.A. Plant; B. De Vivo; A. Lima

487

New fission fragment distributions and r-process origin of the rare-earth elements  

E-Print Network [OSTI]

Neutron star (NS) merger ejecta offer a viable site for the production of heavy r-process elements with nuclear mass numbers A > 140. The crucial role of fission recycling is responsible for the robustness of this site against many astrophysical uncertainties, but calculations sensitively depend on nuclear physics. In particular the fission fragment yields determine the creation of 110 140.

Goriely, S; Lemaitre, J -F; Panebianco, S; Dubray, N; Hilaire, S; Bauswein, A; Janka, H -Thomas

2013-01-01T23:59:59.000Z

488

Stark broadening data for spectral lines of rare-earth elements: Nb III  

E-Print Network [OSTI]

The electron-impact widths for 15 doubly charged Nb ion lines have been theoretically determined by using the modified semiempirical method. Using the obtained results, we considered the influence of the electron-impact mechanism on line shapes in spectra of chemically peculiar stars and white dwarfs.

Simi?, Zoran; Popovi?, Luka ?

2013-01-01T23:59:59.000Z

489

R-Process Freezeout, Nuclear Deformation, and the Rare-Earth Element Peak  

E-Print Network [OSTI]

We use network calculations of r-process nucleosynthesis to explore the origin of the peak in the solar r-process abundance distribution near nuclear mass number A = 160. The peak is due to a subtle interplay of nuclear deformation and beta decay, and forms not in the steady phase of the r-process, but only just prior to freezeout, as the free neutrons rapidly disappear. Its existence should therefore help constrain the conditions under which the r-process occurs and freezes out.

R. Surman; J. Engel; J. R. Bennett; B. S. Meyer

1997-01-03T23:59:59.000Z

490

Rare earth element sorption onto hydrous manganese oxide A modeling study  

E-Print Network [OSTI]

element sorption onto hydrous manganese oxide A modeling study Olivier Pourret1* and MĂ©lanie Davranche2 1 models due to the lack of a comprehensive set of sorption reactions consistent with a given surface complexation model (SCM), as well as discrepancies between published sorption data and predictions using

Paris-Sud XI, Université de

491

Parity nonconservation in Fr-like actinide and Cs-like rare-earth-metal ions  

Science Journals Connector (OSTI)

Parity-nonconservation (PNC) amplitudes are calculated for the 7s-6d3/2 transitions of the francium isoelectronic sequence (Fr, Ra+, Ac2+, Th3+, Pa4+, U5+, and Np6+) and for the 6s-5d3/2 transitions of the cesium isoelectronic sequence (Cs, Ba+, La2+, Ce3+, and Pr4+). We show in particular that isotopes of La2+, Ac2+, and Th3+ ions have strong potential in the search for new physics beyond the standard model: The PNC amplitudes are large, the calculations are accurate, and the nuclei are practically stable. In addition, 232Th3+ ions have recently been trapped and cooled [Campbell et al., Phys. Rev. Lett. 102, 233004 (2009)]. We also extend previous works by calculating the s-s PNC transitions in Ra+ and Ba+ and provide calculations of several energy levels, and electric dipole and quadrupole transition amplitudes for the Fr-like actinide ions.

B. M. Roberts; V. A. Dzuba; V. V. Flambaum

2013-07-15T23:59:59.000Z

492

Resonant Inelastic X-ray Scattering of Rare-Earth and Copper Systems  

E-Print Network [OSTI]

2.3 Corrosion of Copper Films in Aqueous2.3.1 Cu 2p XAS of Copper Films in Various2.3.2 Cu 2p RIXS of Copper Film in Groundwater

Kvashnina, Kristina

2007-01-01T23:59:59.000Z

493

E-Print Network 3.0 - actinide-rare earth fraction Sample Search...  

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

Group Collection: Biology and Medicine ; Environmental Sciences and Ecology 8 The Greenhouse Effect Temperature Equilibrium Summary: The Greenhouse Effect 12;Temperature...

494

Acid-Based Synthesis of Monodisperse Rare-Earth-Doped Colloidal SiO2 Spheres  

E-Print Network [OSTI]

display narrow-line intra-4f transi- tions that are first order independent of the local environment method to dope SiO2 particles with RE ions via an acid-based wet chemical synthesis route by adding of the particles are studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM

Polman, Albert

495

Wavelength-stable rare earth-free green light-emitting diodes for energy efficiency  

Science Journals Connector (OSTI)

Solid state lighting seeks to replace both, incandescent and fluorescent lighting by energy efficient light-emitting diodes (LEDs). Just like compact fluorescent tubes, current white...

Wetzel, Christian; Detchprohm, Theeradetch

2011-01-01T23:59:59.000Z

496

Creating a Star on Earth  

Broader source: Energy.gov [DOE]

At the Energy Department's Princeton Plasma Physics Lab, scientists are trying to accomplish what was once considered the realm of science fiction: creating a star on Earth.

497

Earth Day 2014 Photo Contest  

Office of Environmental Management (EM)

Earth Day 2014 Photo Contest CALLING ALL PHOTOGRAPHERS Professionals, amateurs, and the camera sharp shooter We invite all DOE employees and DOE contractors to share images of...

498

Dynamics of Earth's Hadley circulation.  

E-Print Network [OSTI]

?? This thesis advances our understanding of the mechanisms controlling the Hadley circulation, and its interaction with eddies on planetary scales in particular. On Earth,… (more)

Levine, Xavier Josselin

2013-01-01T23:59:59.000Z

499

Materialism and materiality  

Science Journals Connector (OSTI)

Accountants and auditors in recent financial scandals have been pictured as materialistic, simply calculating consequences and ignoring duties. This paper potentially explains this apparently materialistic behaviour in what has historically been a truthtelling profession. Materiality, which drives audit priorities, has been institutionalised in accounting and auditing standards. But a materiality focus inherently implies that all amounts that are not 'materially' misstated are equally true. This leads to habitual immaterial misstatements and promotes the view that auditors do not care about truth at all. Auditors' lack of commitment to truth undermines their claim to be professionals in the classic sense.

Michael K. Shaub

2005-01-01T23:59:59.000Z

500

Search for Earth-like planets includes LANL star analysis  

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

Search for earth-like planets Search for earth-like planets Search for Earth-like planets includes LANL star analysis The mission will not only be able to search for planets around other stars, but also yield new insights into the parent stars themselves. March 6, 2009 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.