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Sample records for high temperature superconductor

  1. High temperature superconductor current leads

    DOE Patents [OSTI]

    Hull, John R.; Poeppel, Roger B.

    1995-01-01

    An electrical lead having one end for connection to an apparatus in a cryogenic environment and the other end for connection to an apparatus outside the cryogenic environment. The electrical lead includes a high temperature superconductor wire and an electrically conductive material distributed therein, where the conductive material is present at the one end of the lead at a concentration in the range of from 0 to about 3% by volume, and at the other end of the lead at a concentration of less than about 20% by volume. Various embodiments are shown for groups of high temperature superconductor wires and sheaths.

  2. High temperature superconductor current leads

    DOE Patents [OSTI]

    Hull, J.R.; Poeppel, R.B.

    1995-06-20

    An electrical lead is disclosed having one end for connection to an apparatus in a cryogenic environment and the other end for connection to an apparatus outside the cryogenic environment. The electrical lead includes a high temperature superconductor wire and an electrically conductive material distributed therein, where the conductive material is present at the one end of the lead at a concentration in the range of from 0 to about 3% by volume, and at the other end of the lead at a concentration of less than about 20% by volume. Various embodiments are shown for groups of high temperature superconductor wires and sheaths. 9 figs.

  3. Fabrication of high temperature superconductors

    DOE Patents [OSTI]

    Balachandran, Uthamalingam; Dorris, Stephen E.; Ma, Beihai; Li, Meiya

    2003-06-17

    A method of forming a biaxially aligned superconductor on a non-biaxially aligned substrate substantially chemically inert to the biaxially aligned superconductor comprising is disclosed. A non-biaxially aligned substrate chemically inert to the superconductor is provided and a biaxially aligned superconductor material is deposited directly on the non-biaxially aligned substrate. A method forming a plume of superconductor material and contacting the plume and the non-biaxially aligned substrate at an angle greater than 0.degree. and less than 90.degree. to deposit a biaxially aligned superconductor on the non-biaxially aligned substrate is also disclosed. Various superconductors and substrates are illustrated.

  4. High temperature crystalline superconductors from crystallized glasses

    DOE Patents [OSTI]

    Shi, Donglu

    1992-01-01

    A method of preparing a high temperature superconductor from an amorphous phase. The method involves preparing a starting material of a composition of Bi.sub.2 Sr.sub.2 Ca.sub.3 Cu.sub.4 Ox or Bi.sub.2 Sr.sub.2 Ca.sub.4 Cu.sub.5 Ox, forming an amorphous phase of the composition and heat treating the amorphous phase for particular time and temperature ranges to achieve a single phase high temperature superconductor.

  5. Sealed glass coating of high temperature ceramic superconductors

    DOE Patents [OSTI]

    Wu, Weite; Chu, Cha Y.; Goretta, Kenneth C.; Routbort, Jules L.

    1995-01-01

    A method and article of manufacture of a lead oxide based glass coating on a high temperature superconductor. The method includes preparing a dispersion of glass powders in a solution, applying the dispersion to the superconductor, drying the dispersion before applying another coating and heating the glass powder dispersion at temperatures below oxygen diffusion onset and above the glass melting point to form a continuous glass coating on the superconductor to establish compressive stresses which enhance the fracture strength of the superconductor.

  6. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound...

  7. Pseudogap and Superconducting Gap in High-Temperature Superconductors

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

    Pseudogap and Superconducting Gap in High-Temperature Superconductors Two decades after the discovery of first high temperature superconductors, the microscopic mechanism of high-Tc superconductivity remains elusive. In conventional superconductors, it has been well established that electrons form so-called "Cooper pairs" to give rise to superconductivity. The pair binding manifests itself as an energy gap in many spectroscopic measurements. This energy gap, known as superconducting

  8. Sealed glass coating of high temperature ceramic superconductors

    DOE Patents [OSTI]

    Wu, W.; Chu, C.Y.; Goretta, K.C.; Routbort, J.L.

    1995-05-02

    A method and article of manufacture of a lead oxide based glass coating on a high temperature superconductor is disclosed. The method includes preparing a dispersion of glass powders in a solution, applying the dispersion to the superconductor, drying the dispersion before applying another coating and heating the glass powder dispersion at temperatures below oxygen diffusion onset and above the glass melting point to form a continuous glass coating on the superconductor to establish compressive stresses which enhance the fracture strength of the superconductor. 8 figs.

  9. Particle-hole symmetry broken pseudogap in high temperature superconductors

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

    Particle-hole symmetry broken pseudogap in high temperature superconductors High-temperature (Tc) superconductivity is one of the most important topics in condensed matter physics. Despite extensive studies over more than two decades, the microscopic mechanism of high temperature superconductivity still remains elusive due to many unconventional properties that are not well understood. Among them, the most mysterious behavior of high-Tc superconductor is the nature of so called

  10. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Two Phase Transitions Make a High-Temperature Superconductor Print Wednesday, 30 November 2011 00:00 Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally

  11. DOE Science Showcase - Understanding High-Temperature Superconductors |

    Office of Scientific and Technical Information (OSTI)

    OSTI, US Dept of Energy Office of Scientific and Technical Information Understanding High-Temperature Superconductors Credit: DOE Scientists have long worked to understand one of the great mysteries of modern physics - the origin and behavior of high-temperature superconductors (HTS) that are uniquely capable of transmitting electricity with zero loss when chilled to subzero temperatures. For decades there have been competing theories and misunderstandings of how HTS materials actually work

  12. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first

  13. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first

  14. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first

  15. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first

  16. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first

  17. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first

  18. Two Phase Transitions Make a High-Temperature Superconductor

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

    Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first

  19. Method of manufacturing a high temperature superconductor with improved transport properties

    DOE Patents [OSTI]

    Balachandran, Uthamalingam; Siegel, Richard W.; Askew, Thomas R.

    2001-01-01

    A method of preparing a high temperature superconductor. A method of preparing a superconductor includes providing a powdered high temperature superconductor and a nanophase paramagnetic material. These components are combined to form a solid compacted mass with the paramagnetic material disposed on the grain boundaries of the polycrystaline high temperature superconductor.

  20. Design of High Field Solenoids made of High Temperature Superconductors

    SciTech Connect (OSTI)

    Bartalesi, Antonio; /Pisa U.

    2010-12-01

    This thesis starts from the analytical mechanical analysis of a superconducting solenoid, loaded by self generated Lorentz forces. Also, a finite element model is proposed and verified with the analytical results. To study the anisotropic behavior of a coil made by layers of superconductor and insulation, a finite element meso-mechanic model is proposed and designed. The resulting material properties are then used in the main solenoid analysis. In parallel, design work is performed as well: an existing Insert Test Facility (ITF) is adapted and structurally verified to support a coil made of YBa{sub 2}Cu{sub 3}O{sub 7}, a High Temperature Superconductor (HTS). Finally, a technological winding process was proposed and the required tooling is designed.

  1. Method for fabrication of high temperature superconductors

    DOE Patents [OSTI]

    Balachandran, Uthamalingam; Ma, Beihai; Miller, Dean

    2009-07-14

    A layered article of manufacture and a method of manufacturing same is disclosed. A substrate has a biaxially textured MgO crystalline layer having the c-axes thereof inclined with respect to the plane of the substrate deposited thereon. A layer of one or more of YSZ or Y.sub.2O.sub.3 and then a layer of CeO.sub.2 is deposited on the MgO. A crystalline superconductor layer with the c-axes thereof normal to the plane of the substrate is deposited on the CeO.sub.2 layer. Deposition of the MgO layer on the substrate is by the inclined substrate deposition method developed at Argonne National Laboratory. Preferably, the MgO has the c-axes thereof inclined with respect to the normal to the substrate in the range of from about 10.degree. to about 40.degree. and YBCO superconductors are used.

  2. Method for fabrication of high temperature superconductors

    DOE Patents [OSTI]

    Balachandran, Uthamalingam; Ma, Beihai; Miller, Dean

    2006-03-14

    A layered article of manufacture and a method of manufacturing same is disclosed. A substrate has a biaxially textured MgO crystalline layer having the c-axes thereof inclined with respect to the plane of the substrate deposited thereon. A layer of one or more of YSZ or Y2O3 and then a layer of CeO2 is deposited on the MgO. A crystalline superconductor layer with the c-axes thereof normal to the plane of the substrate is deposited on the CeO2 layer. Deposition of the MgO layer on the substrate is by the inclined substrate deposition method developed at Argonne National Laboratory. Preferably, the MgO has the c-axes thereof inclined with respect to the normal to the substrate in the range of from about 10.degree. to about 40.degree. and YBCO superconductors are used.

  3. Cryocooler applications for high-temperature superconductor magnetic bearings.

    SciTech Connect (OSTI)

    Niemann, R. C.

    1998-05-22

    The efficiency and stability of rotational magnetic suspension systems are enhanced by the use of high-temperature superconductor (HTS) magnetic bearings. Fundamental aspects of the HTS magnetic bearings and rotational magnetic suspension are presented. HTS cooling can be by liquid cryogen bath immersion or by direct conduction, and thus there are various applications and integration issues for cryocoolers. Among the numerous cryocooler aspects to be considered are installation; operating temperature; losses; and vacuum pumping.

  4. Improved Growth of High-Temperature Superconductors with HF Pressure

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

    Control - Energy Innovation Portal Electricity Transmission Electricity Transmission Find More Like This Return to Search Improved Growth of High-Temperature Superconductors with HF Pressure Control Brookhaven National Laboratory Contact BNL About This Technology Publications: PDF Document Publication A new method of HF control for synthesizing YBCO using the BaF2 ex situ process (83 KB) Graphical representation of the removal of hydrogen fluoride gas by the absorber during growth of

  5. Metallic substrates for high temperature superconductors

    DOE Patents [OSTI]

    Truchan, Thomas G.; Miller, Dean J.; Goretta, Kenneth C.; Balachandran, Uthamalingam; Foley, Robert

    2002-01-01

    A biaxially textured face-centered cubic metal article having grain boundaries with misorientation angles greater than about 8.degree. limited to less than about 1%. A laminate article is also disclosed having a metal substrate first rolled to at least about 95% thickness reduction followed by a first annealing at a temperature less than about 375.degree. C. Then a second rolling operation of not greater than about 6% thickness reduction is provided, followed by a second annealing at a temperature greater than about 400.degree. C. A method of forming the metal and laminate articles is also disclosed.

  6. Nearly Perfect Fluidity in a High Temperature Superconductor

    SciTech Connect (OSTI)

    Rameau, J. D.; Reber, T. J.; Yang, H. -B.; Akhanjee, S.; Gu, G. D.; Johnson, P. D.; Campbell, S.

    2014-10-13

    Perfect fluids are characterized as having the smallest ratio of shear viscosity to entropy density, η/s, consistent with quantum uncertainty and causality. So far, nearly perfect fluids have only been observed in the quark-gluon plasma and in unitary atomic Fermi gases, exotic systems that are amongst the hottest and coldest objects in the known universe, respectively. We use angle resolved photoemission spectroscopy to measure the temperature dependence of an electronic analog of η/s in an optimally doped cuprate high-temperature superconductor, finding it too is a nearly perfect fluid around, and above, its superconducting transition temperature Tc.

  7. Nearly Perfect Fluidity in a High Temperature Superconductor

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Rameau, J. D.; Reber, T. J.; Yang, H. -B.; Akhanjee, S.; Gu, G. D.; Johnson, P. D.; Campbell, S.

    2014-10-13

    Perfect fluids are characterized as having the smallest ratio of shear viscosity to entropy density, η/s, consistent with quantum uncertainty and causality. So far, nearly perfect fluids have only been observed in the quark-gluon plasma and in unitary atomic Fermi gases, exotic systems that are amongst the hottest and coldest objects in the known universe, respectively. We use angle resolved photoemission spectroscopy to measure the temperature dependence of an electronic analog of η/s in an optimally doped cuprate high-temperature superconductor, finding it too is a nearly perfect fluid around, and above, its superconducting transition temperature Tc.

  8. Preparation of thin film high temperature superconductors

    SciTech Connect (OSTI)

    VenKatesan, X.X.T.; Li, Q.; Findikoglu, A.; Hemmick, D. . Dept. of Physics); Wu, X.D. ); Inam, A.; Chang, C.C.; Ramesh, R.; Hwang, D.M.; Ravi, T.S.; Etemad, S.; Martinez, J.A.; Wilkens, B. )

    1991-03-01

    This paper addresses fundamental issues in preparing high quality high T{sub c} YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} thin films. The techniques of inverted cylindrical magnetron sputtering and pulsed laser deposition are chosen as successful examples to illustrate how the key problems can be solved. The fabrication of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}/PrBa{sub 2}Cu{sub 3}O{sub 7{minus}x} superlattices where superconductivity in a single unit cell layer of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} was observed demonstrates the state of the art of thin film deposition of high T{sub c} materials. Systematic variations of the deposition parameters result in changes of superconducting and structural properties of the films that correlate with their microwave and infrared characteristics.

  9. DOE Science Showcase - Understanding High-Temperature Superconductors...

    Office of Scientific and Technical Information (OSTI)

    Read about HTS technology, basic science and progress towards theory in Dr. William ... Superconductors (Hindawi Publishing), Science Open Access Journals (SOAJ) High ...

  10. Microwave characterization of high-temperature superconductors

    SciTech Connect (OSTI)

    Cooke, D.W.; Gray, E.R.; Arendt, P.N.; Beery, J.G.; Bennett, B.L.; Brown, D.R.; Houlton, R.J.; Jahan, M.S.; Klapetzky, A.J.; Maez, M.A.; Raistrick, I.D.; Reeves, G.A.; Rusnak, B.

    1989-01-01

    Thick (10-15 {mu}m) Tl-Ba-Ca-Cu-O films have been deposited onto yttria-stabilized zirconia and Ag substrates by d.c. magnetron sputtering techniques. Direct deposition onto 1'' diameter yttria-stabilized zirconia yields films with typical 22 GHz surface resistance (R{sub s}) values of 5.2 {plus minus} 2 m{Omega} and 52 {plus minus} 2 m{Omega} at 10 K and 77 K, respectively. For comparison, R{sub s} of Cu at this same frequency is 10 m{Omega} at 4 K and 22 m{Omega} at 77 K. Tl-Ba-Ca-Cu-O films have also been deposited onto 1'' diameter Ag substrates using Au/Cu, Cu, and BaF{sub 2} buffer layers. The lowest R{sub s} values were obtained on films with a BaF{sub 2} buffer layer, typical values being 7.8 {plus minus} 2 m{Omega} and 30.6 {plus minus} 2 m{Omega} (measured at 22 GHz) at 10 K and 77 K, respectively. Larger films (1.5'' diameter) with similar R{sub s} values were prepared using this same technique, demonstrating that the fabrication process can be scaled to larger surface areas. These films are promising for radiofrequency cavity applications because they are thick (50-75 times the London penetration depth), have relatively large surface areas, are fabricated on metallic substrates, and have R{sub s} values that are competitive with Cu at 77 K and are lower than Cu at 4 K. Because they are polycrystalline and unoriented, it is anticipated that their R{sub s} values can be lowered by improving the processing technique. High-quality films of YBa{sub 2}Cu{sub 3}O{sub 7} have been electron-beam deposited onto 1'' LaGaO{sub 3} and 1.5'' LaAlO{sub 3} substrates. The 1'' sample is characterized by R{sub s} values of 0.2 {plus minus} 0.1 m{Omega} at 4 K and 18.6 {plus minus} 2 m{Omega} at 77 K. The 4-K value is only 2-4 times higher than Nb. The 1.5'' sample has R{sub s} values (measured at 18 GHz) of 0.93 {plus minus} 2 m{Omega} and 71 {plus minus} 3 m{Omega} at 10 K and 77 K, respectively. 18 refs., 8 figs.

  11. SCALING OF THE SUPERFLUID DENSITY IN HIGH-TEMPERATURE SUPERCONDUCTORS.

    SciTech Connect (OSTI)

    HOMES, C.C.

    2005-10-24

    A scaling relation N{sub c} {approx} 4.4{sigma}{sub dc}T{sub c} has been observed parallel and perpendicular to the copper-oxygen planes in the high-temperature superconductors; N{sub c} is the spectral weight and {sigma}{sub dc} is the dc conductivity just above the critical temperature T{sub c}. In addition, Nb and Pb also fall close to the this scaling line. The application of the Ferrell-Glover-Tinkham sum rule to the BCS optical properties of Nb above and below T{sub c} yields N{sub c} {approx} 8.1{sigma}{sub dc}T{sub c} when the normal-state scattering rate is much greater than the superconducting energy gap (1/{tau} > 2{Delta}, the ''dirty'' limit). This result implies that the high-temperature superconductors may be in the dirty limit. The superconductivity perpendicular to the planes is explained by the Josephson effect, which again yields N{sub c} {approx} 8.1{sigma}{sub dc}T{sub c} in the BCS formalism. The similar forms for the scaling relation in these two directions suggests that in some regime the dirty limit and the Josephson effect may be viewed as equivalent.

  12. Theory of intertwined orders in high temperature superconductors

    SciTech Connect (OSTI)

    Fradkin, Eduardo; Tranquada, John M.; Kivelson, Steven A.

    2015-03-26

    The electronic phase diagrams of many highly correlated systems, and in particular the cuprate high temperature superconductors, are complex, with many different phases appearing with similarsometimes identicalordering temperatures even as material properties, such as a dopant concentration, are varied over wide ranges. This complexity is sometimes referred to as competing orders. However, since the relation is intimate, and can even lead to the existence of new phases of matter such as the putative pair-density-wave, the general relation is better thought of in terms of intertwined orders. We selectively analyze some of the experiments in the cuprates which suggest that essential aspects of the physics are reflected in the intertwining of multiple ordersnot just in the nature of each order by itself. We also summarize and critique several theoretical ideas concerning the origin and implications of this complexity.

  13. Theory of intertwined orders in high temperature superconductors

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Fradkin, Eduardo; Tranquada, John M.; Kivelson, Steven A.

    2015-03-26

    The electronic phase diagrams of many highly correlated systems, and in particular the cuprate high temperature superconductors, are complex, with many different phases appearing with similar—sometimes identical—ordering temperatures even as material properties, such as a dopant concentration, are varied over wide ranges. This complexity is sometimes referred to as “competing orders.” However, since the relation is intimate, and can even lead to the existence of new phases of matter such as the putative “pair-density-wave,” the general relation is better thought of in terms of “intertwined orders.” We selectively analyze some of the experiments in the cuprates which suggest that essentialmore » aspects of the physics are reflected in the intertwining of multiple orders—not just in the nature of each order by itself. We also summarize and critique several theoretical ideas concerning the origin and implications of this complexity.« less

  14. Theory of intertwined orders in high temperature superconductors

    SciTech Connect (OSTI)

    Fradkin, Eduardo; Tranquada, John M.; Kivelson, Steven A.

    2015-03-26

    The electronic phase diagrams of many highly correlated systems, and in particular the cuprate high temperature superconductors, are complex, with many different phases appearing with similar—sometimes identical—ordering temperatures even as material properties, such as a dopant concentration, are varied over wide ranges. This complexity is sometimes referred to as “competing orders.” However, since the relation is intimate, and can even lead to the existence of new phases of matter such as the putative “pair-density-wave,” the general relation is better thought of in terms of “intertwined orders.” We selectively analyze some of the experiments in the cuprates which suggest that essential aspects of the physics are reflected in the intertwining of multiple orders—not just in the nature of each order by itself. We also summarize and critique several theoretical ideas concerning the origin and implications of this complexity.

  15. Studies of nonlinear electrodynamics of high-temperature superconductors

    SciTech Connect (OSTI)

    Lam, Quan-Chiu H.

    1991-08-01

    Nonlinear electrodynamics of high-{Tc} superconductors are studied both theoretically and experimentally. For powdered samples, a novel model is presented in which the metallographically observed superconducting grains in the powder are modeled as superconducting current loops of various areas with weak links. Surprising harmonic generation behavior in an arc field, H{sub 1} cos({omega}t), is predicted by the model; the power at high harmonics show sharp dips almost periodic in a superposing dc magnetic field, revealing flux quantization in the prototype loops in the model. Such oscillation of the harmonic power in dc magnetic field P{sub nf}(H{sub dc}), is indeed experimentally observed in powdered YBa{sub 2}Cu{sub 3}O{sub 7}. Other experimental aspects also agree with model predictions. For bulk sintered cylindrical samples, a generalized critical state model is presented. In this model, the nonlinear electrodynamics are due to flux-pinning, somewhat similar to low-temperature type-II superconductors, but with a more generalized critical current densities' dependence on magnetic field -- J{sub c}(H){approximately}H{sub local}{sup -{beta}}, with {beta} being an adjustable parameter. Experiments in ac and dc magnetic fields on a sintered cylindrical rod of YBa{sub 2}Cu{sub 3}O{sub 7} yield unambiguous evidence of independent inter- and intragranular contributions to the complex harmonic permeability {tilde {mu}}{sub n} = {mu}{prime}{sub n} -i{mu}{double prime}{sub n}. Temperature- dependence measurements reveal that, while the intragranular supercurrents disappear at {Tc}{ge}91.2 K, the intergranular supercurrents disappear at T{ge}86.6 K. This result is, to our knowledge, the first clear measurement of the phase-locking temperature of the 3-D matrix formed by YBa{sub 2}Cu{sub 3}O{sub 7} grains, which are in electrical contact with one another through weak links.

  16. Studies of nonlinear electrodynamics of high-temperature superconductors

    SciTech Connect (OSTI)

    Lam, Quan-Chiu H.

    1991-08-01

    Nonlinear electrodynamics of high-{Tc} superconductors are studied both theoretically and experimentally. For powdered samples, a novel model is presented in which the metallographically observed superconducting grains in the powder are modeled as superconducting current loops of various areas with weak links. Surprising harmonic generation behavior in an arc field, H{sub 1} cos({omega}t), is predicted by the model; the power at high harmonics show sharp dips almost periodic in a superposing dc magnetic field, revealing flux quantization in the prototype loops in the model. Such oscillation of the harmonic power in dc magnetic field P{sub nf}(H{sub dc}), is indeed experimentally observed in powdered YBa{sub 2}Cu{sub 3}O{sub 7}. Other experimental aspects also agree with model predictions. For bulk sintered cylindrical samples, a generalized critical state model is presented. In this model, the nonlinear electrodynamics are due to flux-pinning, somewhat similar to low-temperature type-II superconductors, but with a more generalized critical current densities` dependence on magnetic field -- J{sub c}(H){approximately}H{sub local}{sup -{beta}}, with {beta} being an adjustable parameter. Experiments in ac and dc magnetic fields on a sintered cylindrical rod of YBa{sub 2}Cu{sub 3}O{sub 7} yield unambiguous evidence of independent inter- and intragranular contributions to the complex harmonic permeability {tilde {mu}}{sub n} = {mu}{prime}{sub n} -i{mu}{double_prime}{sub n}. Temperature- dependence measurements reveal that, while the intragranular supercurrents disappear at {Tc}{ge}91.2 K, the intergranular supercurrents disappear at T{ge}86.6 K. This result is, to our knowledge, the first clear measurement of the phase-locking temperature of the 3-D matrix formed by YBa{sub 2}Cu{sub 3}O{sub 7} grains, which are in electrical contact with one another through weak links.

  17. Microwave properties of HTS (high temperature superconductor) films

    SciTech Connect (OSTI)

    Cooke, D.W.; Arendt, P.N.; Gray, E.R.; Muenchausen, R.E.; Bennett, B.L.; Foltyn, S.R.; Estler, R.C.; Wu, X.D.; Reeves, G.A.; Elliott, N.E.; Brown, D.R. ); Portis, A.M. ); Taber, R.C. . Labs.); Mogro-Campero, A. . Corporate Research and Development Ce

    1990-01-01

    High-frequency applications of high-temperature superconductors generally fall into two categories: devices that require low values of surface resistance R{sub s} in ambient surface magnetic fields H{sub rf}, and devices that require low R{sub s} in modest fields. Moreover, many applications can be realized with small-surface-area films whereas others require larger areas-radiofrequency (rf) cavities, for example. Regardless of the application, the potential of HTS films is predicated on satisfying one or both of the above-stated requirements. We have measured the surface resistance of small-area (1 cm{sup 2}) and large-area (6.5 cm{sup 2}) YBa{sub 2}Cu{sub 3}O{sub 7} (YBCO) films that have been laser ablated onto LaA{ell}O{sub 3} substrates, large-area (5.1 cm{sup 2}) YBCO films that have been e-beam deposited onto LaA{ell}O{sub 3}, and large-area (11.4 cm{sup 2}) T{ell}-based films that have been magnetron sputtered onto metallic substrates. The best R{sub s} values are obtained from the 1-cm{sup 2} laser-ablated films; they are 40 {mu}{Omega} and 340 {mu}{Omega} at 4 K and 77 K, respectively ({omega}/2{pi} = 10 GHz). Comparable values for Cu are 6 and 13 m{Omega}, respectively. Large-area T{ell}-based films yield typical R{sub s} values of 4 m{Omega} and 14 m{Omega} at 4 K and 77 K, respectively ({omega}/2{pi} = 18 GHz). The dependence of R{sub s} on H{sub rf} for these films indicates that surface fields as large as 55 Oe can be achieved with R{sub s} increasing only by a factor of 10. This field dependence is associated with c-axis texturing.

  18. Method And Apparatus For Evaluatin Of High Temperature Superconductors

    DOE Patents [OSTI]

    Fishman, Ilya M.; Kino, Gordon S.

    1996-11-12

    A technique for evaluation of high-T.sub.c superconducting films and single crystals is based on measurement of temperature dependence of differential optical reflectivity of high-T.sub.c materials. In the claimed method, specific parameters of the superconducting transition such as the critical temperature, anisotropy of the differential optical reflectivity response, and the part of the optical losses related to sample quality are measured. The apparatus for performing this technique includes pump and probe sources, cooling means for sweeping sample temperature across the critical temperature and polarization controller for controlling a state of polarization of a probe light beam.

  19. Single crystal NMR studies of high temperature superconductors

    SciTech Connect (OSTI)

    Pennington, C.H.; Durand, D.J.; Zax, D.B.; Slichter, C.P.; Rice, J.P.; Bukowski, E.D.; Ginsberg, D.M.

    1989-01-01

    The authors report Cu NMR studies in the normal state of a single crystal of the T/sub c/ = 90 K superconductor YBa/sub 2/Cu/sub 3/O/sub 7/minus/delta/. The authors have measured the magnetic shift tensor, the electric field gradient tensor, the nuclear spin-lattice relaxation rate tensor, and the time dependence and functional form of the transverse decay. From these data they obtain information about the charge state and magnetic state of the Cu atoms, and the existence and size of the electronic exchange coupling between spins of adjacent Cu atoms. 18 refs., 3 figs., 2 tabs.

  20. Characterization of high-current, high-temperature superconductor current lead elements

    SciTech Connect (OSTI)

    Niemann, R.C.; Evans, D.J.; Fisher, B.L.; Brockenborough, W.E.; Roberts, P.R.; Rodenbush, A.J.

    1996-08-01

    The refrigeration loads of current leads for superconducting magnets can be significantly reduced by using high-temperature superconductor (HTS) leads. An HTS conductor type that is well suited for this application is a laminated sintered stack of HTS powder-in-tube (PIT) tapes. The superconducting elements are normally characterized by their manufacturer by measuring critical currents at 77 K in self field. Additional characterization, which correlates electrical performance at 77 K and at lower temperatures with applied magnetic fields, provides the current lead designer and conductor element manufacturer with critical information. For HTS conductor elements comprising a laminated and sintered stack of Bi-2223 PIT tapes having an alloyed Ag sheath, this characterization uses variable applied fields and operating temperatures.

  1. New Developments in the Theory of HTSC [High Temperature Superconductors

    DOE R&D Accomplishments [OSTI]

    Abrikosov, A.A.

    1994-09-01

    The superconductor is supposed to consist of alternating layers of two kinds: (1) layers with an attractive electron interaction and an effective mass of usual magnitude, (2) layers without interaction and with a large effective mass. The overlap between the layers is assumed to be small, its energy, t, being much less than {Delta}. It is shown, that such a model explains the most peculiar property found in experiments on electronic Raman light scattering in BSCCO 2212: different threshold values for the Raman satellite measured at two different polarizations of the incident and scattered light. The tunneling conductance G(V)= dJ/dV is analyzed for the same model. In order to fit the qualitative features of experimental data, it is assumed that the tunneling probability to the normal layers is much less, than to the superconducting layers. The conductance is calculated for the case t{much_lt}{Delta}. A brief analysis is given for the case t{approximately}{Delta}, which proves that such an assumption definitely contradicts the experimental data for BSCCO. The possible nature of the electronic states in the normal layers is discussed. In connection with the experimental discovery (angle resolved photoemission spectroscopy, ARPES) of the extended saddle point singularities in the electron spectrum of a variety of HTSC consequences are derived for T{sub c} and {Delta} in a simple model. A large enhancement of superconductivity is possible if the singularity has a sufficient extension and is located close to the Fermi energy. In order to explain the anisotropy of the energy gap, observed in ARPES experiments, on the basis of the "extended saddle point singularities" an assumption is done that the Coulomb interactions are weakly screened, i.e. the Debye screening radius is much larger than the lattice period; this makes the electron interaction long ranged (E-L model).

  2. Process for preparing high-transition-temperature superconductors in the Nb-Al-Ge system

    DOE Patents [OSTI]

    Giorgi, A.L.; Szklarz, E.G.

    1973-01-30

    The patent describes a process for preparing superconducting materials in the Nb-Al-Ge system having transition temperatures in excess of 19K. The process comprises premixing powdered constituents, pressing them into a plug, heating the plug to 1,450-1,800C for 30 minutes to an hour under vacuum or an inert atmosphere, and annealing at moderate temperatures for reasonably long times (approximately 50 hours). High transition-temperature superconductors, including those in the Nb3(Al,Ge) system, prepared in accordance with this process exhibit little degradation in the superconducting transition temperature on being ground to -200 mesh powder. (GRA)

  3. In the OSTI Collections: High-Temperature Superconductors | OSTI, US Dept

    Office of Scientific and Technical Information (OSTI)

    of Energy Office of Scientific and Technical Information High-Temperature Superconductors Technology Basic Science Progress towards theory References Research Organizations and Scientific Societies Reports Available through OSTI's SciTech Connect Patents available through OSTI's DOepatents Additional References One of the lessons of quantum physics is that any set of subatomic particles bound together by mutual attractions have quite distinct states of relative motion determined by how the

  4. Magnetization studies of oxides related to the high temperature cuprate superconductors

    SciTech Connect (OSTI)

    Wang, Z.

    1995-06-19

    The magnetic properties related to the following high temperature superconductors were measured utilizing a Faraday magnetometer: BaCuO{sub 2+x}, La{sub 2} CuO{sub 4}, Sr{sub 2} RhO{sub 4}, Sr{sub 2} VO{sub 4}, and Sr{sub 2} CuO{sub 3}. Neutron diffraction, magnetic susceptibility, and heat capacity measurements are discussed.

  5. Two Phase Transitions Make a High-Temperature Superconductor

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

    does not vanish until a characteristic temperature, T* ("T-star"), is reached. He and Hashimoto et al. have now shown that the pseudogap represents, not a smooth crossover...

  6. High-Tc Superconductor

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

    Donghui Lu, Kyle Shen, and Zhi-Xun Shen Departments of Applied Physics, Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305 High-temperature superconductors (HTSC's), following their remarkable discovery in 1986, continue to be at the center stage of modern condensed matter physics. Despite great efforts from both theoretical and experimental sides, the mechanism of HTSC still remains elusive. One of the most peculiar aspects of HTSC's is that their

  7. High transition temperature superconductor/insulator bilayers for the development of ultra-fast electronics

    SciTech Connect (OSTI)

    Sirena, M.; Flix, L. Avils; Instituto Balseiro, Universidad Nacional de Cuyo and CNEA, 8400 Bariloche ; Haberkorn, N.

    2013-07-29

    High transition temperature superconductor (HTc)/SrTiO{sub 3} (STO) bilayers were fabricated by sputtering deposition on (100) STO substrates. Their transport and morphological properties were characterized using conductive atomic force microscopy. The STO barriers present good insulating properties, with long attenuation lengths (? ? 1 nm) which reduce the junction resistance and increase the operating critical current. The samples present roughness values smaller than 1 nm, with an extremely low density of surface defects (?5 10{sup ?5} defects/?m{sup 2}). The high control of the barrier quality over large defect free surfaces is encouraging for the development of microelectronics devices based in HTc Josephson junctions.

  8. Nanoscale interplay of strain and doping in a high-temperature superconductor

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zeljkovic, Ilija; Gu, Genda; Nieminen, Jouko; Huang, Dennis; Chang, Tay-Rong; He, Yang; Jeng, Horng-Tay; Xu, Zhijun; Wen, Jinsheng; Lin, Hsin; et al

    2014-11-07

    The highest temperature superconductors are electronically inhomogeneous at the nanoscale, suggesting the existence of a local variable which could be harnessed to enhance the superconducting pairing. Here we report the relationship between local doping and local strain in the cuprate superconductor Bi₂Sr₂CaCu₂O₈₊x. We use scanning tunneling microscopy to discover that the crucial oxygen dopants are periodically distributed, in correlation with local strain. Our picoscale investigation of the intra-unit-cell positions of all oxygen dopants provides essential structural input for a complete microscopic theory.

  9. Nanoscale interplay of strain and doping in a high-temperature superconductor

    SciTech Connect (OSTI)

    Zeljkovic, Ilija; Gu, Genda; Nieminen, Jouko; Huang, Dennis; Chang, Tay-Rong; He, Yang; Jeng, Horng-Tay; Xu, Zhijun; Wen, Jinsheng; Lin, Hsin; Markiewicz, Robert S.; Bansil, Arun; Hoffman, Jennifer E.

    2014-11-07

    The highest temperature superconductors are electronically inhomogeneous at the nanoscale, suggesting the existence of a local variable which could be harnessed to enhance the superconducting pairing. Here we report the relationship between local doping and local strain in the cuprate superconductor Bi₂Sr₂CaCu₂O₈₊x. We use scanning tunneling microscopy to discover that the crucial oxygen dopants are periodically distributed, in correlation with local strain. Our picoscale investigation of the intra-unit-cell positions of all oxygen dopants provides essential structural input for a complete microscopic theory.

  10. Nanoscale interplay of strain and doping in a high-temperature superconductor

    SciTech Connect (OSTI)

    Zeljkovic, Ilija; Gu, Genda; Nieminen, Jouko; Huang, Dennis; Chang, Tay-Rong; He, Yang; Jeng, Horng-Tay; Xu, Zhijun; Wen, Jinsheng; Lin, Hsin; Markiewicz, Robert S.; Bansil, Arun; Hoffman, Jennifer E.

    2014-11-07

    The highest temperature superconductors are electronically inhomogeneous at the nanoscale, suggesting the existence of a local variable which could be harnessed to enhance the superconducting pairing. Here we report the relationship between local doping and local strain in the cuprate superconductor Bi?Sr?CaCu?O??x. We use scanning tunneling microscopy to discover that the crucial oxygen dopants are periodically distributed, in correlation with local strain. Our picoscale investigation of the intra-unit-cell positions of all oxygen dopants provides essential structural input for a complete microscopic theory.

  11. Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2

    SciTech Connect (OSTI)

    Christianson, Andrew D; Goremychkin, E. A.; Osborn, R.; Rosenkranz, Stephen; Lumsden, Mark D; Malliakas, C.; Todorov, L.; Claus, H.; Chung, D.Y.; Kanatzidis, M.; Bewley, Robert I.; Guidi, T.

    2008-12-18

    A new family of superconductors containing layers of iron arsenide has attracted considerable interest because of their high transition temperatures (T{sub c}), some of which are >50 K, and because of similarities with the high-{sub c} copper oxide superconductors. In both the iron arsenides and the copper oxides, superconductivity arises when an antiferromagnetically ordered phase has been suppressed by chemical doping. A universal feature of the copper oxide superconductors is the existence of a resonant magnetic excitation, localized in both energy and wavevector, within the superconducting phase. This resonance, which has also been observed in several heavy-fermion superconductors is predicted to occur when the sign of the superconducting energy gap takes opposite values on different parts of the Fermi surface, an unusual gap symmetry which implies that the electron pairing interaction is repulsive at short range. Angle-resolved photoelectron spectroscopy shows no evidence of gap anisotropy in the iron arsenides, but such measurements are insensitive to the phase of the gap on separate parts of the Fermi surface. Here we report inelastic neutron scattering observations of a magnetic resonance below T{sub c} in Ba{sub 0.6}K{sub 0.4}Fe{sub 2}As{sub 2}, a phase-sensitive measurement demonstrating that the superconducting energy gap has unconventional symmetry in the iron arsenide superconductors.

  12. Method for preparing high transition temperature Nb/sub 3/Ge superconductors. [Patent application

    DOE Patents [OSTI]

    Newkirk, L.R.; Valencia, F.A.

    1975-06-26

    Bulk coatings of Nb/sub 3/Ge superconductors having transition temperatures in excess of 20/sup 0/K are readily formed by a chemical vapor deposition technique involving the coreduction of NbCl/sub 5/ and GeCl/sub 4/ in the presence of hydrogen. The NbCl/sub 5/ vapor may advantageously be formed quantitatively in the temperature range of about 250 to 260/sup 0/C by the chlorination of Nb metal provided the partial pressure of the product NbCl/sub 5/ vapor is maintained at or below about 0.1 atm.

  13. Method for preparing high transition temperature Nb.sub.3 Ge superconductors

    DOE Patents [OSTI]

    Newkirk, Lawrence R.; Valencia, Flavio A.

    1977-01-01

    Bulk coatings of Nb.sub.3 Ge superconductors having transition temperatures in excess of 20 K are readily formed by a chemical vapor deposition technique involving the coreduction of NbCl.sub.5 and GeCl.sub.4 in the presence of hydrogen. The NbCl.sub.5 vapor may advantageously be formed quantitatively in the temperature range of about 250.degree. to 260.degree. C by the chlorination of Nb metal provided the partial pressure of the product NbCl.sub.5 vapor is maintained at or below about 0.1 atm.

  14. Magnetic frustration in the three-band Anderson lattice model for high-temperature superconductors

    SciTech Connect (OSTI)

    Ihle, D.; Kasner, M. )

    1990-09-01

    The three-band Anderson lattice model for the CuO{sub 2} planes in high-{Tc} superconductors is established. Treating this model by perturbation theory, the effective spin interactions are derived. The antiferromagnetic superexchange integrals are calculated as functions of the direct oxygen transfer and the hole concentration. It is found that frustration in the superexchange occurs, even in the undoped case, which increases with oxygen trnasfer and decreases with hole concentration.

  15. Apex-oxygen-atom tunneling as source of anomalous low-temperature specific heat in high- T sub c superconductors

    SciTech Connect (OSTI)

    Zoli, M. )

    1991-10-01

    A model is proposed in which the quantum tunneling of the apex oxygen atom is coupled to the quasiparticle excitations of the superconducting state. A path-integral formulation allows one to renormalize the coupling constant as a function of temperature. It is shown that such a model can account for the anomalous low-temperature specific heat observed in high-{ital T}{sub {ital c}} YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors.

  16. Design, Test and Demonstration of Saturable Reactor High-Temperature Superconductor Fault Current Limiters

    SciTech Connect (OSTI)

    Frank Darmann; Robert Lombaerde; Franco Moriconi; Albert Nelson

    2011-10-31

    Zenergy Power has successfully designed, built, tested, and installed in the US electrical grid a saturable reactor Fault Current Limiter. Beginning in 2007, first as SC Power Systems and from 2008 as Zenergy Power, Inc., ZP used DOE matching grant and ARRA funds to help refine the design of the saturated reactor fault current limiter. ZP ultimately perfected the design of the saturated reactor FCL to the point that ZP could reliably design a suitable FCL for most utility applications. Beginning with a very basic FCL design using 1G HTS for a coil housed in a LN2 cryostat for the DC bias magnet, the technology progressed to a commercial system that was offered for sale internationally. Substantial progress was made in two areas. First, the cryogenics cooling system progressed from a sub-cooled liquid nitrogen container housing the HTS coils to cryostats utilizing dry conduction cooling and reaching temperatures down to less than 20 degrees K. Large, round cryostats with “warm bore” diameters of 1.7 meters enabled the design of large tanks to hold the AC components. Second, the design of the AC part of the FCL was refined from a six legged “spider” design to a more compact and lighter design with better fault current limiting capability. Further refinement of the flux path and core shape led to an efficient saturated reactor design requiring less Ampere-turns to saturate the core. In conclusion, the development of the saturable reactor FCL led to a more efficient design not requiring HTS magnets and their associated peripheral equipment, which yielded a more economical product in line with the electric utility industry expectations. The original goal for the DOE funding of the ZP project “Design, Test and Demonstration of Saturable Reactor High-Temperature Superconductor Fault Current Limiters” was to stimulate the HTS wire industry with, first 1G, then 2G, HTS wire applications. Over the approximately 5 years of ZP’s product

  17. Method for preparing preferentially oriented, high temperature superconductors using solution reagents

    DOE Patents [OSTI]

    Lee, Dominic F.; Kroeger, Donald M.; Goyal, Amit

    2002-01-01

    A multi-domained bulk REBa.sub.2 CU.sub.3 O.sub.x with low-angle domain boundaries which resemble a quasi-single domained material and a method for producing the same comprising arranging multiple seeds, which can be small single crystals, single domained melt-textured REBa.sub.2 CU.sub.3 O.sub.x pieces, textured substrates comprises of grains with low misorientation angles, or thick film REBa.sub.2 CU.sub.3 O.sub.x deposited on such textured substrate, such seeds being tailored for various REBa.sub.2 CU.sub.3 O.sub.x compounds, in specific pattern and relative seed orientations on a superconductor precursor material which may be placed in contact with a porous substrate so as to reduce the amount of liquid phase in the melt. Because seeds can be arranged in virtually any pattern, high quality REBa.sub.2 CU.sub.3 O.sub.x elements of virtually unlimited size and complex geometry can be fabricated.

  18. Preferentially oriented, High temperature superconductors by seeding and a method for their preparation

    DOE Patents [OSTI]

    Lee, Dominic F.; Kroeger, Donald M.; Goyal, Amit

    2001-01-01

    A multi-domained bulk REBa.sub.2 Cu.sub.3 O.sub.x with low-angle domain boundaries which resembles a quasi-single domained material and a method for producing the same comprising arranging multiple seeds, which can be small single crystals, single domained melt-textured REBa.sub.2 Cu.sub.3 O.sub.x pieces, textured substrates comprised of grains with low misorientation angles, or thick film REBa.sub.2 Cu.sub.3 O.sub.x deposited on such textured substrate, such seeds being tailored for various REBa.sub.2 Cu.sub.3 O.sub.x compounds, in specific pattern and relative seed orientations on a superconductor precursor material which may be placed in contact with a porous substrate so as to reduce the amount of liquid phase in the melt. Because seeds can be arranged in virtually any pattern, high quality REBa.sub.2 Cu.sub.3 O.sub.x elements of virtually unlimited size and complex geometry can be fabricated.

  19. High pressure low temperature studies on 1-2-2 iron-based superconductors using designer diamond cells

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Uhoya, Walter O.; Tsoi, Georgiy M.; Vohra, Yogesh K.; Mitchell, Jonathan, E.; Safa-Sefat, Athena; Weir, Samuel

    2013-01-01

    In this study, high pressure low temperature electrical resistance measurements were carried out on a series of 122 iron-based superconductors using a designer diamond anvil cell. These studies were complemented by image plate x-ray diffraction measurements under high pressures and low temperatures at beamline 16-BM-D, HPCAT, Advanced Photon Source. A common feature of the 1-2-2 iron-based materials is the observation of anomalous compressibility effects under pressure and a Tetragonal (T) to Collapsed Tetragonal (CT) phase transition under high pressures. Specific studies on antiferromagnetic spin-density-wave Ba0.5Sr0.5Fe2As2 and Ba(Fe0.9Ru0.1)2As2 samples are presented to 10 K and 41 GPa. The collapsed tetragonal phasemore » was observed at a pressure of 14 GPa in Ba0.5Sr0.5Fe2As2 at ambient temperature. The highest superconducting transition temperature in Ba0.5Sr0.5Fe2As2 was observed to be at 32 K at a pressure of 4.7 GPa. The superconductivity was observed to be suppressed on transformation to the CT phase in 122 materials.« less

  20. Method and apparatus for cooling high temperature superconductors with neon-nitrogen mixtures

    DOE Patents [OSTI]

    Laverman, Royce J.; Lai, Ban-Yen

    1993-01-01

    Apparatus and methods for cooling high temperature superconducting materials (HTSC) to superconductive temperatures within the range of 27.degree. K. to 77.degree. K. using a mixed refrigerant consisting of liquefied neon and nitrogen containing up to about ten mole percent neon by contacting and surrounding the HTSC material with the mixed refrigerant so that free convection or forced flow convection heat transfer can be effected.

  1. Electromagnetic behavior of high-{Tc} superconductors

    SciTech Connect (OSTI)

    Ma, J.G.; Wolff, I.

    1996-05-01

    Using a new proposed model, the electromagnetic behavior of high-temperature superconductors (HTSs) is discussed. It indicates that the real part of the complex conductivity of HTSs is dependent on the driving frequency, and the simulated results agree well with measured data in literature. Nonlinear surface resistances dependence on an external magnetic field are also simulated and compared with experimental results.

  2. Inductively-Charged High-Temperature Superconductors And Methods Of Use

    DOE Patents [OSTI]

    Bromberg, Leslie

    2003-09-16

    The invention provides methods of charging superconducting materials and, in particular, methods of charging high-temperature superconducting materials. The methods generally involve cooling a superconducting material to a temperature below its critical temperature. Then, an external magnetic field is applied to charge the material at a nearly constant temperature. The external magnetic field first drives the superconducting material to a critical state and then penetrates into the material. When in the critical state, the superconducting material loses all the pinning ability and therefore is in the flux-flow regime. In some embodiments, a first magnetic field may be used to drive the superconducting material to the critical state and then a second magnetic field may be used to penetrate the superconducting material. When the external field or combination of external fields are removed, the magnetic field that has penetrated into the material remains trapped. The charged superconducting material may be used as solenoidal magnets, dipole magnets, or other higher order multipole magnets in many applications.

  3. Method and apparatus of cryogenic cooling for high temperature superconductor devices

    DOE Patents [OSTI]

    Yuan, Xing; Mine, Susumu

    2005-02-15

    A method and apparatus for providing cryogenic cooling to HTS devices, in particular those that are used in high-voltage electric power applications. The method involves pressurizing liquid cryogen to above one atmospheric pressure to improve its dielectric strength, while sub-cooling the liquid cryogen to below its saturation temperature in order to improve the performance of the HTS components of the device. An apparatus utilizing such a cooling method consists of a vessel that contains a pressurized gaseous cryogen region and a sub-cooled liquid cryogen bath, a liquid cryogen heating coupled with a gaseous cryogen venting scheme to maintain the pressure of the cryogen to a value in a range that corresponds to optimum dielectric strength of the liquid cryogen, and a cooling system that maintains the liquid cryogen at a temperature below its boiling point to improve the performance of HTS materials used in the device.

  4. "Flexible aerogel as a superior thermal insulation for high temperature superconductor cable applications"

    SciTech Connect (OSTI)

    White, Shannon O. [Aspen Aerogel, Inc.; Demko, Jonathan A [ORNL; Tomich, A. [Aspen Aerogel, Inc.

    2010-01-01

    High temperature superconducting (HTS) cables are an advanced technology that can both strengthen and improve the national electrical distribution infrastructure. HTS cables require sufficient cooling to overcome inherent low temperature heat loading. Heat loads are minimized by the use of cryogenic envelopes or cryostats. Cryostats require improvement in efficiency, reliability, and cost reduction to meet the demanding needs of HTS conductors (1G and 2G wires). Aspen Aerogels has developed a compression resistant aerogel thermal insulation package to replace compression sensitive multi-layer insulation (MLI), the incumbent thermal insulation, in flexible cryostats for HTS cables. Oak Ridge National Laboratory tested a prototype aerogel package in a lab-scale pipe apparatus to measure the rate of heat invasion. The lab-scale pipe test results of the aerogel solution will be presented and directly compared to MLI. A compatibility assessment of the aerogel material with HTS system components will also be presented. The aerogel thermal insulation solution presented will meet the demanding needs of HTS cables.

  5. High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O

    DOE Patents [OSTI]

    Ginley, David S.; Hietala, Vincent M.; Hohenwarter, Gert K. G.; Martens, Jon S.; Plut, Thomas A.; Tigges, Chris P.; Vawter, Gregory A.; Zipperian, Thomas E.

    1994-10-25

    A process for formulating non-hysteretic and hysteretic Josephson junctions using HTS materials which results in junctions having the ability to operate at high temperatures while maintaining high uniformity and quality. The non-hysteretic Josephson junction is formed by step-etching a LaAlO.sub.3 crystal substrate and then depositing a thin film of TlCaBaCuO on the substrate, covering the step, and forming a grain boundary at the step and a subsequent Josephson junction. Once the non-hysteretic junction is formed the next step to form the hysteretic Josephson junction is to add capacitance to the system. In the current embodiment, this is accomplished by adding a thin dielectric layer, LaA1O.sub.3, followed by a cap layer of a normal metal where the cap layer is formed by first depositing a thin layer of titanium (Ti) followed by a layer of gold (Au). The dielectric layer and the normal metal cap are patterned to the desired geometry.

  6. High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O

    DOE Patents [OSTI]

    Ginley, D.S.; Hietala, V.M.; Hohenwarter, G.K.G.; Martens, J.S.; Plut, T.A.; Tigges, C.P.; Vawter, G.A.; Zipperian, T.E.

    1994-10-25

    A process is disclosed for formulating non-hysteretic and hysteretic Josephson junctions using HTS materials which results in junctions having the ability to operate at high temperatures while maintaining high uniformity and quality. The non-hysteretic Josephson junction is formed by step-etching a LaAlO[sub 3] crystal substrate and then depositing a thin film of TlCaBaCuO on the substrate, covering the step, and forming a grain boundary at the step and a subsequent Josephson junction. Once the non-hysteretic junction is formed the next step to form the hysteretic Josephson junction is to add capacitance to the system. In the current embodiment, this is accomplished by adding a thin dielectric layer, LaA1O[sub 3], followed by a cap layer of a normal metal where the cap layer is formed by first depositing a thin layer of titanium (Ti) followed by a layer of gold (Au). The dielectric layer and the normal metal cap are patterned to the desired geometry. 8 figs.

  7. High-transition-temperature superconductors in the Nb-Al-Ge system

    DOE Patents [OSTI]

    Giorgi, A.L.; Szklarz, E.G.

    1972-09-26

    The patent describes superconducting materials of the nominal composition Nb(x)Al(y)Ge(l-y), where x is in the range of 1.9 to 2.8 and y is in the range of 0.5 to 0.9, having transition temperatures in the 19 -20K. range which are readily produced by annealing arc-melted compositions, or cold-pressed, heat-treated compositions at moderate temperatures for reasonably long times (about 50 hours).

  8. Highly oxidized superconductors

    DOE Patents [OSTI]

    Morris, Donald E.

    1994-01-01

    Novel superconducting materials in the form of compounds, structures or phases are formed by performing otherwise known syntheses in a highly oxidizing atmosphere rather than that created by molecular oxygen at atmospheric pressure or below. This leads to the successful synthesis of novel superconducting compounds which are thermodynamically stable at the conditions under which they are formed.

  9. Highly oxidized superconductors

    DOE Patents [OSTI]

    Morris, D.E.

    1994-09-20

    Novel superconducting materials in the form of compounds, structures or phases are formed by performing otherwise known synthesis in a highly oxidizing atmosphere rather than that created by molecular oxygen at atmospheric pressure or below. This leads to the successful synthesis of novel superconducting compounds which are thermodynamically stable at the conditions under which they are formed. 16 figs.

  10. Bridging the Gaps of High-Tc Superconductor

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

    Bridging the Gaps of High-Tc Superconductor Since the discovery of high-temperature superconductor by Bednorz and Müller in 1986, this field has become one of the most important research topics in solid state physics. In the past 20 years many unconventional properties have been discovered in this new class of materials. These have challenged our conventional wisdom and driven the development of many novel theories. Among these discoveries, the most mysterious is probably the pseudogap

  11. High-Temperature Superconductivity

    ScienceCinema (OSTI)

    Peter Johnson

    2010-01-08

    Like astronomers tweaking images to gain a more detailed glimpse of distant stars, physicists at Brookhaven National Laboratory have found ways to sharpen images of the energy spectra in high-temperature superconductors ? materials that carry electrical c

  12. Ambient-temperature superconductor symetrical metal-dihalide bis-(ethylenedithio)-tetrathiafulvalene compounds

    DOE Patents [OSTI]

    Williams, Jack M.; Wang, Hsien-Hau; Beno, Mark A.

    1987-01-01

    A new class of organic superconductors having the formula (ET).sub.2 MX.sub.2 wherein ET represents bis(ethylenedithio)-tetrathiafulvalene, M is a metal such as Au, Ag, In, Tl, Rb, Pd and the like and X is a halide. The superconductor (ET).sub.2 AuI.sub.2 exhibits a transition temperature of 5 K. which is high for organic superconductors.

  13. Current-carrying element based on second-generation high-temperature superconductor for the magnet system of a fusion neutron source

    SciTech Connect (OSTI)

    Novikov, M. S. Ivanov, D. P. E-mail: denis.ivanov30@mail.ru; Novikov, S. I. Shuvaev, S. A. E-mail: sergey.shuvaev@phystech.edu

    2015-12-15

    Application of current-carrying elements (CCEs) made of second-generation high-temperature superconductor (2G HTS) in magnet systems of a fusion neutron source (FNS) and other fusion devices will allow their magnetic field and thermodynamic stability to be increased substantially in comparison with those of low-temperature superconductor (LTS) magnets. For a toroidal magnet of the FNS, a design of a helical (partially transposed) CCE made of 2G HTS is under development with forced-flow cooling by helium gas, a current of 20–30 kA, an operating temperature of 10–20 K, and a magnetic field on the winding of 12–15 T (prospectively ∼20 T). Short-sized samples of the helical flexible heavy-current CCE are being fabricated and investigated; a pilot-line unit for production of long-sized CCE pieces is under construction. The applied fabrication technique allows the CCE to be produced which combines a high operating current, thermal and mechanical stability, manufacturability, and low losses in the alternating modes. The possibility of fabricating the CCE with the outer dimensions and values of the operating parameter required for the FNS (and with a significant margin) using already available serial 2G HTS tapes is substantiated. The maximum field of toroidal magnets with CCEs made of 2G HTS will be limited only by mechanical properties of the magnet’s casing and structure, while the thermal stability will be approximately two orders of magnitude higher than that of toroidal magnets with LTS-based CCEs. The helical CCE made of 2G HTS is very promising for fusion and hybrid electric power plants, and its design and technologies of production, as well as the prototype coils made of it for the FNS and other tokamaks, are worth developing now.

  14. Electron Correlation in Iron-Based Superconductors

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

    mechanism of superconductivity in the copper-based "high-temperature superconductors." ... for the famous copper-based "high-temperature superconductors," also known as cuprates. ...

  15. High temperature superconducting fault current limiter

    DOE Patents [OSTI]

    Hull, John R.

    1997-01-01

    A fault current limiter (10) for an electrical circuit (14). The fault current limiter (10) includes a high temperature superconductor (12) in the electrical circuit (14). The high temperature superconductor (12) is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter (10).

  16. High temperature superconducting fault current limiter

    DOE Patents [OSTI]

    Hull, J.R.

    1997-02-04

    A fault current limiter for an electrical circuit is disclosed. The fault current limiter includes a high temperature superconductor in the electrical circuit. The high temperature superconductor is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter. 15 figs.

  17. Organic Superconductors

    SciTech Connect (OSTI)

    Charles Mielke

    2009-02-27

    Intense magnetic fields are an essential tool for understanding layered superconductors. Fundamental electronic properties of organic superconductors are revealed in intense (60 tesla) magnetic fields. Properties such as the topology of the Fermi surface and the nature of the superconducting order parameter are revealed. With modest maximum critical temperatures~13K the charge transfer salt organic superconductors prove to be incredibly valuable materials as their electronically clean nature and layered (highly anisotropic) structures yield insights to the high temperature superconductors. Observation of de Haas-van Alphen and Shubnikov-de Haas quantum oscillatory phenomena, magnetic field induced superconductivity and re-entrant superconductivity are some of the physical phenomena observed in the charge transfer organic superconductors. In this talk, I will discuss the nature of organic superconductors and give an overview of the generation of intense magnetic fields; from the 60 tesla millisecond duration to the extreme 1000 tesla microsecond pulsed magnetic fields.

  18. Superconductor Requirements and Characterization for High Field Accelerator Magnets

    SciTech Connect (OSTI)

    Barzi, E.; Zlobin, A. V.

    2015-05-01

    The 2014 Particle Physics Project Prioritization Panel (P5) strategic plan for U.S. High Energy Physics (HEP) endorses a continued world leadership role in superconducting magnet technology for future Energy Frontier Programs. This includes 10 to 15 T Nb3Sn accelerator magnets for LHC upgrades and a future 100 TeV scale pp collider, and as ultimate goal that of developing magnet technologies above 20 T based on both High Temperature Superconductors (HTS) and Low Temperature Superconductors (LTS) for accelerator magnets. To achieve these objectives, a sound conductor development and characterization program is needed and is herein described. This program is intended to be conducted in close collaboration with U.S. and International labs, Universities and Industry.

  19. High-resolution dichroic imaging of magnetic flux distributions in superconductors with scanning x-ray microscopy

    SciTech Connect (OSTI)

    Ruoß, S. Stahl, C.; Weigand, M.; Schütz, G.; Albrecht, J.

    2015-01-12

    The penetration of magnetic flux into high-temperature superconductors has been observed using a high-resolution technique based on x-ray magnetic circular dichroism. Superconductors coated with thin soft-magnetic layers are observed in a scanning x-ray microscope under the influence of external magnetic fields. Resulting electric currents in the superconductor create an inhomogeneous magnetic field distribution above the superconductor and lead to a local reorientation of the ferromagnetic layer. Measuring the local magnetization of the ferromagnet by x-ray absorption microscopy with circular-polarized radiation allows the analysis of the magnetic flux distribution in the superconductor with a spatial resolution on the nanoscale.

  20. Bearing design for flywheel energy storage using high-TC superconductors

    DOE Patents [OSTI]

    Hull, John R.; Mulcahy, Thomas M.

    2000-01-01

    A high temperature superconductor material bearing system (38) This system (38) includes a rotor (50) having a ring permanent magnet (60), a plurality of permanent magnets (16, 20 and 70) for interacting to generate levitation forces for the system (38). This group of magnets are a push/pull bearing (75). A high temperature superconductor structure (30) interacts with the ting permanent magnet (60) to provide stabilizing forces for the system (38).

  1. Novel magnets and superconductors studied by high precision magnetic...

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

    Novel magnets and superconductors studied by high precision magnetic susceptometer under pressure An Inductor-capacitor circuit (LC circuit) is a simple, text-book level electric...

  2. Electromagnetics in high-{Tc} superconductors

    SciTech Connect (OSTI)

    Ma, J.G.; Wolff, I.

    1996-04-01

    The behavior of electromagnetic fields in high-{Tc} superconductors (HTS`s) is studied in order to examine their effects in classical electromagnetic boundary value problems. It is shown that an HTS can not be simply treated as a low loss conductor and boundary conditions of HTS`s can not be considered as perfect conducting boundaries like conventional treatments. The electromagnetics of HTS are investigated in terms of complex conductivity, surface impedance with applied magnetic fields, and computational electrodynamics using the new proposed model in Ref. 1.

  3. Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO{sub 2} planes

    SciTech Connect (OSTI)

    Makarov, I. A., E-mail: macplay@mail.ru; Ovchinnikov, S. G.; Shneider, E. I. [Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Branch (Russian Federation)

    2012-02-15

    The influence of interlayer hoppings on the superconducting transition temperature (T{sub c}) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t{sub Up-Tack }(k) = t{sub Up-Tack }(cos(k{sub x}) - cos(k{sub y})){sup 2} and treated as a small perturbation for the states of two CuO{sub 2} planes described by the t-t Prime -t Double-Prime -J* model. In the generalized mean field approximation for d{sub x}{sup 2} - y{sup 2} symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO{sub 2} layers provides an additional mechanism of Cooper pair formation or an increase in T{sub c}. In the concentration dependence of T{sub c}, the bilayer splitting of the upper Hubbard band of quasi-holes is manifested as two peaks with temperatures slightly lower than the maximum T{sub c} for a single-layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.

  4. Seeing Stripes: Competition and Complexity in High-Temperature...

    Office of Scientific and Technical Information (OSTI)

    Seeing Stripes: Competition and Complexity in High-Temperature Superconductors Citation Details In-Document Search Title: Seeing Stripes: Competition and Complexity in...

  5. Synthesis of highly phase pure BSCCO superconductors

    DOE Patents [OSTI]

    Dorris, Stephen E.; Poeppel, Roger B.; Prorok, Barton C.; Lanagan, Michael T.; Maroni, Victor A.

    1995-01-01

    An article and method of manufacture of (Bi, Pb)-Sr-Ca-Cu-O superconductor. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi, Pb)-Sr-Ca-Cu-O superconductor.

  6. Synthesis of highly phase pure BSCCO superconductors

    DOE Patents [OSTI]

    Dorris, S.E.; Poeppel, R.B.; Prorok, B.C.; Lanagan, M.T.; Maroni, V.A.

    1995-11-21

    An article and method of manufacture (Bi, Pb)-Sr-Ca-Cu-O superconductor are disclosed. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi, Pb)-Sr-Ca-Cu-O superconductor. 5 figs.

  7. Bounding the Pseudogap in Cuprate High-TC Superconductors (Technical...

    Office of Scientific and Technical Information (OSTI)

    Citation Details In-Document Search Title: Bounding the Pseudogap in Cuprate High-TC Superconductors Authors: McDonald, Ross David 1 ; Shehter, Arkady 1 ; Balakirev, Fedor F. ...

  8. Melt-spin processing of high {Tc} oxide superconductors

    SciTech Connect (OSTI)

    Folkerts, T.J.; Wu, Hengning; Yoo, S.I.; Merkle, B.D.; Arrasmith, S.R.; Dennis, K.W.; Kramer, M.J.; McCallum, R.W.

    1993-10-01

    Containerless techniques offer distinct advantages for the melt processing of oxide superconductors. The majority of these materials form liquids which are highly reactive with standard crucible materials such as Al{sub 2}O{sub 3} and Pt, resulting in non-negligible contamination. We have developed a containerless melt-spin processing technique where in 50--400 {mu}m particles of REBa{sub 2}Cu{sub 3}O{sub 7-x} high temperature oxide superconductors are melted in free fall through a vertical tube furnace and quenched onto a copper wheel. Previously this method has been successful in producing glasses of NdBa{sub 2}Cu{sub 3}O{sub 7-x} and GdBa{sub 2}Cu{sub 3}O{sub 7-x}. In this report we discuss the results for both stoichiometric and non-stoichiometric YBa{sub 2}Cu{sub 3}O{sub 7-x} (Y123). Thermal, microstructural, and superconducting characterization of both the as-quenched and the annealed materials will be presented.

  9. Strength and flexibility of bulk high-{Tc} superconductors

    SciTech Connect (OSTI)

    Goretta, K.C.; Jiang, M.; Kupperman, D.S.; Lanagan, M.T.; Singh, J.P.; Vasanthamohan, N.; Hinks, D.G.; Mitchell, J.F.; Richardson, J.W. Jr.

    1996-08-01

    Strength, fracture toughness, and elastic modulus data have been gathered for bulk high-temperature superconductors, commercial 99.9% Ag, and a 1.2 at.% Mg/Ag alloy. These data have been used to calculate fracture strains for bulk conductors. The calculations indicate that the superconducting cores of clad tapes should begin to fracture at strains below 0.2%. In addition, residual strains in Ag-clad (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} tapes have been measured by neutron diffraction. An explanation is offered for why many tapes appear to be able to tolerate large strains before exhibiting a reduction in current transport.

  10. Superconductors

    DOE Patents [OSTI]

    Newkirk, Lawrence R.; Valencia, Flavio A.

    1977-02-01

    The structural quality of niobium germanide as a high-transition-temperature superconducting material is substantially improved by the presence of about 5 at. % oxygen. Niobium germanide having this oxygen content may readily be prepared as a bulk coating bonded to a metallic substrate by chemical vapor deposition techniques.

  11. Electronic Structure of LaOFeP - a Different Type of High Temperature

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

    Superconductor Electronic Structure of LaOFeP - a Different Type of High Temperature Superconductor The recent discovery of superconductivity in iron-based layered compounds has created renewed interest in high temperature superconductivity. With a superconducting transition temperature as high as 55 K, this discovery not only ended the monopoly of copper oxides in the family of high temperature superconductors, but also provides a new direction to understand the essential ingredients for

  12. Enhanced Superconducting Gaps in Trilayer High-Temperature Bi...

    Office of Scientific and Technical Information (OSTI)

    ...-Temperature Bi (2) Sr (2) Ca (2) Cu (3) O (10+delta) Cuprate Superconductor Citation Details In-Document Search Title: Enhanced Superconducting Gaps in Trilayer High-Temperature ...

  13. Neutron scattering studies of spin-phonon hybridization and superconducting spin gaps in the high temperature superconductor La2-x(Sr;Ba)xCuO4

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Wagman, J. J.; Carlo, Jeremy P.; Gaudet, J.; Van Gastel, G. J.; Abernathy, Douglas L.; Stone, Matthew B.; Granroth, Garrett E.; Kolesnikov, Alexander I.; Savici, Andrei T.; Kim, Young -June; et al

    2016-03-14

    We present time-of-flight neutron-scattering measurements on single crystals of La2-xBaxCuO4 (LBCO) with 0 ≤ x ≤ 0.095 and La2-xSrxCuO4 (LSCO) with x = 0.08 and 0.11. This range of dopings spans much of the phase diagram relevant to high temperature cuprate superconductivity, ranging from insulating, three dimensional commensurate long range antiferromagnetic order for x ≤ 0.02 to two dimensional (2D) incommensurate antiferromagnetism co-existing with superconductivity for x ≥ 0.05. Previous work on lightly doped LBCO with x = 0.035 showed a clear resonant enhancement of the inelastic scattering coincident with the low energy crossings of the highly dispersive spin excitationsmore » and quasi-2D optic phonons. The present work extends these measurements across the phase diagram and shows this enhancement to be a common feature to this family of layered quantum magnets. Furthermore we show that the low temperature, low energy magnetic spectral weight is substantially larger for samples with non-superconducting ground states relative to any of the samples with superconducting ground states. Lastly spin gaps, suppression of low energy magnetic spectral weight, are observed in both superconducting LBCO and LSCO samples, consistent with previous observations for superconducting LSCO« less

  14. Crystal Growth And Characterization of the Model High-Temperature Superconductor HgBa{sub 2}CuO{sub 4+{delta}}

    SciTech Connect (OSTI)

    Zhao, Xudong; Yu, Guichuan; Cho, Yong-Chan; Chabot-Couture, Guillaume; Barisic, Neven; Bourges, Philippe; Kaneko, Nobuhisa; Li, Yuan; Lu, Li; Motoyama, Eugene M.; Vajk, Owen P.; Greven, Martin; /Stanford U., Appl. Phys. Dept. /SLAC, SSRL /Jilin U. /Stanford U., Phys. Dept. /Saclay /NIST, Wash., D.C.

    2007-03-16

    Since the discovery of high-transition-temperature (T{sub c}) superconductivity in La{sub 2-x}Ba{sub x}CuO{sub 4} in 1986, the study of the lamellar copper oxides has remained at the forefront of condensed matter physics. Apart from their unusually high values of T{sub c}, these materials also exhibit a variety of complex phenomena and phases. This rich behavior is a consequence of the lamellar crystal structures, formed of copper-oxygen sheets separated by charge reservoir layers, and of the strong electron-electron correlations in the copper-oxygen sheets. After two decades of intensive research, which has stimulated many valuable new insights into correlated electron systems in general, there remains a lack of consensus regarding the correct theory for high-T{sub c} superconductivity. The ultimate technological goal of room-temperature superconductivity might only be attained after the development of a deeper understanding of the mercury-based compounds HgBa{sub 2}Ca{sub n-1}Cu{sub n}OI{sub 2n+2+{delta}}, which currently exhibit the highest T{sub c}values. One very important issue in this regard is the role of electronic versus chemical and structural inhomogeneities in these materials, and the associated need to separate material-specific properties from those that are essential to superconductivity. Unfortunately, there has been remarkably little scientific work on the mercury-based compounds because sizable crystals have not been available; quantitative measurements of any kind would be invaluable benchmarks for testing the theories of high-T{sub c} superconductivity. The compounds HgBa{sub 2}Ca{sub n-1}Cu{sub n}OI{sub 2n+2+{delta}} can be viewed as model systems not only because of their record high-T{sub c} values, but also because of their high-symmetry crystal structures. Of particular interest is the simplest member of this materials family, HgBa{sub 2}CuO{sub 4+{delta}} (Hg1201), which possesses only one copper-oxygen sheet per unit cell (n = 1), as

  15. High Temperature Superconductors: From Delivery to Applications (Presentation from 2011 Ernest Orlando Lawrence Award-winner, Dr. Amit Goyal, and including introduction by Energy Secretary, Dr. Steven Chu)

    ScienceCinema (OSTI)

    Goyal, Amit (Oak Ridge National Laboratory)

    2012-06-28

    Dr. Amit Goyal, a high temperature superconductivity (HTS) researcher at Oak Ridge National Laboratory, was named a 2011 winner of the Department of Energy's Ernest Orlando Lawrence Award honoring U.S. scientists and engineers for exceptional contributions in research and development supporting DOE and its mission. Winner of the award in the inaugural category of Energy Science and Innovation, Dr. Goyal was cited for his work in 'pioneering research and transformative contributions to the field of applied high temperature superconductivity, including fundamental materials science advances and technical innovations enabling large-scale applications of these novel materials.' Following his basic research in grain-to-grain supercurrent transport, Dr. Goyal focused his energy in transitioning this fundamental understanding into cutting-edge technologies. Under OE sponsorship, Dr. Goyal co-invented the Rolling Assisted Bi-Axially Textured Substrate technology (RABiTS) that is used as a substrate for second generation HTS wires. OE support also led to the invention of Structural Single Crystal Faceted Fiber Substrate (SSIFFS) and the 3-D Self Assembly of Nanodot Columns. These inventions and associated R&D resulted in 7 R&D 100 Awards including the 2010 R&D Magazine's Innovator of the Year Award, 3 Federal Laboratory Consortium Excellence in Technology Transfer National Awards, a DOE Energy100 Award and many others. As a world authority on HTS materials, Dr. Goyal has presented OE-sponsored results in more than 150 invited talks, co-authored more than 350 papers and is a fellow of 7 professional societies.

  16. Response of High-Tc Superconductor Metamaterials to High Intensity THz

    Office of Scientific and Technical Information (OSTI)

    Radiation (Conference) | SciTech Connect Response of High-Tc Superconductor Metamaterials to High Intensity THz Radiation Citation Details In-Document Search Title: Response of High-Tc Superconductor Metamaterials to High Intensity THz Radiation Authors: Grady, Nathaniel [1] ; Perkins Jr., Bradford G. [2] ; Hwang, Harold Y. [2] ; Brandt, Nate [2] ; Torchinsky, Darius [2] ; Singh, Ranjan [1] ; Yan, Li [3] ; Jia, Quanxi [1] ; Trugman, Stuart A. [1] ; Taylor, Antoinette J. [1] ; Nelson, Keith

  17. High temperature interfacial superconductivity

    DOE Patents [OSTI]

    Bozovic, Ivan; Logvenov, Gennady; Gozar, Adrian Mihai

    2012-06-19

    High-temperature superconductivity confined to nanometer-scale interfaces has been a long standing goal because of potential applications in electronic devices. The spontaneous formation of a superconducting interface in bilayers consisting of an insulator (La.sub.2CuO.sub.4) and a metal (La.sub.1-xSr.sub.xCuO.sub.4), neither of which is superconducting per se, is described. Depending upon the layering sequence of the bilayers, T.sub.c may be either .about.15 K or .about.30 K. This highly robust phenomenon is confined to within 2-3 nm around the interface. After exposing the bilayer to ozone, T.sub.c exceeds 50 K and this enhanced superconductivity is also shown to originate from a 1 to 2 unit cell thick interfacial layer. The results demonstrate that engineering artificial heterostructures provides a novel, unconventional way to fabricate stable, quasi two-dimensional high T.sub.c phases and to significantly enhance superconducting properties in other superconductors. The superconducting interface may be implemented, for example, in SIS tunnel junctions or a SuFET.

  18. Low-field diamagnetic response of granular superconductors at finite temperatures

    SciTech Connect (OSTI)

    Auletta, C.; Raiconi, G. ); De Luca, R.; Pace, S. )

    1994-05-01

    We study the low-field diamagnetic response of granular superconductors at finite temperatures by means of a simple two-dimensional Josephson-junction array. The temperature effects are taken into account by inserting white-noise current sources in parallel to the resistively shunted junction circuit models of the Josephson junctions of the network. By this analysis we argue that a simplified one-dimensional description of the equivalent circuit, proposed by the authors for cylindrical granular superconductors, is still valid even in the presence of thermally activated flux jumps. A flux-creep picture for intergranular flux motion follows.

  19. Ambient-pressure organic superconductor

    DOE Patents [OSTI]

    Williams, Jack M.; Wang, Hsien-Hau; Beno, Mark A.

    1986-01-01

    A new class of organic superconductors having the formula (ET).sub.2 MX.sub.2 wherein ET represents bis(ethylenedithio)-tetrathiafulvalene, M is a metal such as Au, Ag, In, Tl, Rb, Pd and the like and X is a halide. The superconductor (ET).sub.2 AuI.sub.2 exhibits a transition temperature of 5 K which is high for organic superconductors.

  20. Dense high temperature ceramic oxide superconductors

    DOE Patents [OSTI]

    Landingham, R.L.

    1993-10-12

    Dense superconducting ceramic oxide articles of manufacture and methods for producing these articles are described. Generally these articles are produced by first processing these superconducting oxides by ceramic processing techniques to optimize materials properties, followed by reestablishing the superconducting state in a desired portion of the ceramic oxide composite.

  1. Dense high temperature ceramic oxide superconductors

    DOE Patents [OSTI]

    Landingham, Richard L.

    1993-01-01

    Dense superconducting ceramic oxide articles of manufacture and methods for producing these articles are described. Generally these articles are produced by first processing these superconducting oxides by ceramic processing techniques to optimize materials properties, followed by reestablishing the superconducting state in a desired portion of the ceramic oxide composite.

  2. Method for preparing high temperature superconductor

    DOE Patents [OSTI]

    Balachandran, Uthamalingam (Hinsdale, IL); Chudzik, Michael P. (Beacon, NY)

    2002-01-01

    A method of depositing a biaxially textured metal oxide on a substrate defining a plane in which metal oxide atoms are vaporized from a source to form a plume of metal oxide atoms. Atoms in the plume disposed at a selected angle in a predetermined range of angles to the plane of the substrate are allowed to contact the substrate while preventing atoms outside a selected angle from reaching the substrate. The preferred range of angles is 40.degree.-70.degree. and the preferred angle is 60.degree..+-.5.degree.. A moving substrate is disclosed.

  3. Enhanced Superconducting Gaps in Trilayer High-Temperature Bi (2) Sr (2) Ca

    Office of Scientific and Technical Information (OSTI)

    (2) Cu (3) O (10+delta) Cuprate Superconductor (Journal Article) | SciTech Connect Enhanced Superconducting Gaps in Trilayer High-Temperature Bi (2) Sr (2) Ca (2) Cu (3) O (10+delta) Cuprate Superconductor Citation Details In-Document Search Title: Enhanced Superconducting Gaps in Trilayer High-Temperature Bi (2) Sr (2) Ca (2) Cu (3) O (10+delta) Cuprate Superconductor Authors: Ideta, S ; Takashima, K. ; Hashimoto, M. ; Yoshida, T. ; Fujimori, A. ; Anzai, H. ; Fujita, T. ; Nakashima, Y. ;

  4. Surface texturing of superconductors by controlled oxygen pressure

    DOE Patents [OSTI]

    Chen, N.; Goretta, K.C.; Dorris, S.E.

    1999-01-05

    A method of manufacture of a textured layer of a high temperature superconductor on a substrate is disclosed. The method involves providing an untextured high temperature superconductor material having a characteristic ambient pressure peritectic melting point, heating the superconductor to a temperature below the peritectic temperature, establishing a reduced pO{sub 2} atmosphere below ambient pressure causing reduction of the peritectic melting point to a reduced temperature which causes melting from an exposed surface of the superconductor and raising pressure of the reduced pO{sub 2} atmosphere to cause solidification of the molten superconductor in a textured surface layer. 8 figs.

  5. Surface texturing of superconductors by controlled oxygen pressure

    DOE Patents [OSTI]

    Chen, Nan; Goretta, Kenneth C.; Dorris, Stephen E.

    1999-01-01

    A method of manufacture of a textured layer of a high temperature superconductor on a substrate. The method involves providing an untextured high temperature superconductor material having a characteristic ambient pressure peritectic melting point, heating the superconductor to a temperature below the peritectic temperature, establishing a reduced pO.sub.2 atmosphere below ambient pressure causing reduction of the peritectic melting point to a reduced temperature which causes melting from an exposed surface of the superconductor and raising pressure of the reduced pO.sub.2 atmosphere to cause solidification of the molten superconductor in a textured surface layer.

  6. Giant flux creep through the surface barriers and the irreversibility line in high-{Tc} superconductors

    SciTech Connect (OSTI)

    Burlachkov, L.; Geshkenbein, V.B. ||; Koshelev, A.E. |; Larkin, A.I. |; Vinokur, V.M.

    1994-05-01

    Magnetic flux relaxation over the surface barrier in high temperature superconductors are investigated Vortex dynamics controlled by the penetration both of pancake vortices and vortex lines are discussed. The penetration field H{sub p} for pancakes decay is exponentially with temperature. The size of the magnetization loop is determined by the decay of H{sub p} during the process of relaxation, but its shape remains unchanged. The irreversibility line associated with the pancake penetration is given by H{sub irr} {proportional_to} exp(- 2T/T{sub o}), and may lie both above and below the melting line.

  7. Universal Charge Order in the High-Tc Superconductors | Stanford

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

    Synchrotron Radiation Lightsource Universal Charge Order in the High-Tc Superconductors Wednesday, May 4, 2016 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Speaker: Eduardo H. da Silva Neto - UBC Eduardo H. da Silva Neto was born in Recife, Brazil. He obtained his B.A. in Physics and Mathematics (2008) from Amherst College, and his Ph. D. (2013) in Physics from Princeton University. Since 2013 he has been a Max-Planck-UBC postdoctoral research fellow at the Quantum Matter Institute at

  8. High field superconductor development and understanding project, Final Report

    SciTech Connect (OSTI)

    Larbalestier, David C.; Lee, Peter J.

    2009-07-15

    Over 25 years the Applied Superconductivity Center at the University of Wisconsin-Madison provided a vital technical resource to the High Energy Physics community covering development in superconducting strand for HEP accelerator magnet development. In particular the work of the group has been to develop the next generation of high field superconductors for high field application. Grad students Mike Naus, Chad Fischer, Arno Godeke and Matt Jewell improved our understanding of the microstructure and microchemistry of Nb3Sn and their impact on the physical and mechanical properties. The success of this work has led to the continued funding of this work at the ASC after it moved to the NHMFL and also to direct funding from BNL for some aspects of Nb3Sn cable evaluation.

  9. Universal Charge Order in the High-Tc Superconductors | Stanford...

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

    such as heavy-fermion materials and copper-oxide based superconductors, by the use ... (BCS) theory of superconductivity are obtained in some copper-oxide (cuprate) materials. ...

  10. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Print In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One

  11. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Print In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One

  12. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Print In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One

  13. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Print In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One

  14. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Print In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One

  15. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Print In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One

  16. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Print In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One

  17. Engineered flux-pinning centers in BSCCO TBCCO and YBCO superconductors

    DOE Patents [OSTI]

    Goretta, K.C.; Lanagan, M.T.; Miller, D.J.; Sengupta, S.; Parker, J.C.; Hu, J.; Balachandran, U.; Siegel, R.W.; Shi, D.

    1999-07-27

    A method of preparing a high temperature superconductor is disclosed. A method of preparing a superconductor includes providing a powdered high temperature superconductor and a nanophase material. These components are combined to form a solid compacted mass with the material disposed in the polycrystalline high temperature superconductor. This combined mixture is rapidly heated, forming a dispersion of nanophase size particles without a eutectic reaction. These nanophase particles can have a flat plate or columnar type morphology. 4 figs.

  18. Engineered flux-pinning centers in BSCCO TBCCO and YBCO superconductors

    DOE Patents [OSTI]

    Goretta, Kenneth C.; Lanagan, Michael T.; Miller, Dean J.; Sengupta, Suvankar; Parker, John C.; Hu, Jieguang; Balachandran, Uthamalingam; Siegel, Richard W.; Shi, Donglu

    1999-01-01

    A method of preparing a high temperature superconductor. A method of preparing a superconductor includes providing a powdered high temperature superconductor and a nanophase material. These components are combined to form a solid compacted mass with the material disposed in the polycrystalline high temperature superconductor. This combined mixture is rapidly heated, forming a dispersion of nanophase size particles without a eutectic reaction. These nanophase particles can have a flat plate or columnar type morphology.

  19. Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zareapour, Parisa; Hayat, Alex; Zhao, Shu Yang F.; Kreshchuk, Michael; Lee, Yong Kiat; Reijnders, Anjan A.; Jain, Achint; Xu, Zhijun; Liu, T. S.; Gu, G. D.; et al

    2014-12-09

    In this research, high-temperature superconductors exhibit a wide variety of novel excitations. If contacted with a topological insulator, the lifting of spin rotation symmetry in the surface states can lead to the emergence of unconventional superconductivity and novel particles. In pursuit of this possibility, we fabricated high critical-temperature (Tc ~ 85 K) superconductor/topological insulator (Bi₂Sr₂CaCu₂O₈₊δ/Bi₂Te₂Se) junctions. Below 75 K, a zero-bias conductance peak (ZBCP) emerges in the differential conductance spectra of this junction. The magnitude of the ZBCP is suppressed at the same rate for magnetic fields applied parallel or perpendicular to the junction. Furthermore, it can still be observedmore » and does not split up to at least 8.5 T. The temperature and magnetic field dependence of the excitation we observe appears to fall outside the known paradigms for a ZBCP.« less

  20. Phonon characteristics of high {Tc} superconductors from neutron Doppler broadening measurements

    SciTech Connect (OSTI)

    Trela, W.J.; Kwei, G.H.; Lynn, J.E.; Meggers, K.

    1994-12-01

    Statistical information on the phonon frequency spectrum of materials can be measured by neutron transmission techniques if they contain nuclei with low energy resonances, narrow enough to be Doppler-broadened, in their neutron cross sections. The authors have carried out some measurements using this technique for materials of the lanthanum barium cuprate class, La{sub 2{minus}x}Ba{sub x}CuO{sub 4}. Two samples with slightly different concentrations of oxygen, one being superconductive, the other not, were examined. Pure lanthanum cuprate was also measured. Lanthanum, barium and copper all have relatively low energy narrow resonances. Thus it should be possible to detect differences in the phonons carried by different kinds of atom in the lattice. Neutron cross section measurements have been made with high energy resolution and statistical precision on the 59m flight path of LANSCE, the pulsed spallation neutron source at Los Alamos National Laboratory. Measurements on all three materials were made over a range of temperatures from 15K to 300K, with small steps through the critical temperature region near 27K. No significant changes in the mean phonon energy of the lanthanum atoms were observed near the critical temperature of the super-conducting material. It appears however that the mean phonon energy of lanthanum in the superconductor is considerably higher than that in the non-superconductors. The samples used in this series of experiments were too thin in barium and copper to determine anything significant about their phonon spectra.

  1. High-temperature superconducting current leads

    SciTech Connect (OSTI)

    Niemann, R.C.

    1995-03-01

    Use of high-temperature superconductors (HTSs) for current leads to deliver power to devices at liquid helium temperature can reduce refrigeration requirements to values significantly below those achievable with conventional leads. HTS leads are now near commercial realization. Argonne National Laboratory (ANL) has developed a sinter-forge process to fabricate current leads from bismuth-based superconductors. The current-carrying capacity of these leads is five times better than that of HTS leads made by a conventional fabrication process. ANL along with Superconductivity, Inc., has developed a 1500 ampere current lead for an existing superconducting magnetic energy storage (SMES) device. With Babcock & Wilcox Company, Argonne is creating 16-kiloampere leads for use in a 0.5 MWh SMES. In a third project Argonne performed characterization testing of a existing, proprietary conduction-cooled lead being developed by Zer Res Corp.

  2. Probing high-energy spin fluctuations in iron pnictide superconductors...

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

    spin fluctuations in iron pnictide superconductors and the metal-insulator transition in rare-earth nickelates by soft X-ray RIXS Wednesday, November 18, 2015 - 3:00pm...

  3. High critical currents in heavily doped (Gd,Y)Ba2Cu3Ox superconductor tapes

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Selvamanickam, V.; Gharahcheshmeh, M. Heydari; Xu, A.; Galstyan, E.; Delgado, L.; Cantoni, C.

    2015-01-20

    REBa2Cu3Ox superconductor tapes with moderate levels of dopants have been optimized for high critical current density in low magnetic fields at 77 K, but they do not exhibit exemplary performance in conditions of interest for practical applications, i.e., temperatures less than 50 K and fields of 2–30 T. Heavy doping of REBCO tapes has been avoided by researchers thus far due to deterioration in properties. Here, we report achievement of critical current densities (Jc) above 20 MA/cm2 at 30 K, 3 T in heavily doped (25 mol. % Zr-added) (Gd,Y)Ba2Cu3Ox superconductor tapes, which is more than three times higher thanmore » the Jc typically obtained in moderately doped tapes. Pinning force levels above 1000 GN/m3 have also been attained at 20 K. A composition map of lift factor in Jc (ratio of Jc at 30 K, 3 T to the Jc at 77 K, 0 T) has been developed which reveals the optimum film composition to obtain lift factors above six, which is thrice the typical value. A highly c-axis aligned BaZrO3 (BZO) nanocolumn defect density of nearly 7 × 1011 cm–2 as well as 2–3nm sized particles rich in Cu and Zr have been found in the high Jc films.« less

  4. High-efficiency solid-state lighting and superconductor research receives

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

    funding High-efficiency solid-state lighting and superconductor High-efficiency solid-state lighting and superconductor research receives funding Each project will be funded for up to three years. August 28, 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

  5. 3D Charge Order Found in Superconductor

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

    3D Charge Order Found in Superconductor 3D Charge Order Found in Superconductor Print Wednesday, 08 June 2016 00:00 Despite 30 years of intense study, the explanation behind the zero-resistance current displayed by high-temperature superconductors (HTSCs) is still shrouded in complexity. HTSCs tend to be heterogeneous materials with multiple phases, and disentangling their various electronic behaviors for analysis can be difficult. At the ALS, researchers used resonant soft x-ray diffraction

  6. High temperature interface superconductivity

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Gozar, A.; Bozovic, I.

    2016-01-20

    High-Tc superconductivity at interfaces has a history of more than a couple of decades. In this review we focus our attention on copper-oxide based heterostructures and multi-layers. We first discuss the technique, atomic layer-by-layer molecular beam epitaxy (ALL-MBE) engineering, that enabled High-Tc Interface Superconductivity (HT-IS), and the challenges associated with the realization of high quality interfaces. Then we turn our attention to the experiments which shed light on the structure and properties of interfacial layers, allowing comparison to those of single-phase films and bulk crystals. Both ‘passive’ hetero-structures as well as surface-induced effects by external gating are discussed. Here, wemore » conclude by comparing HT-IS in cuprates and in other classes of materials, especially Fe-based superconductors, and by examining the grand challenges currently laying ahead for the field.« less

  7. High temperature furnace

    DOE Patents [OSTI]

    Borkowski, Casimer J.

    1976-08-03

    A high temperature furnace for use above 2000.degree.C is provided that features fast initial heating and low power consumption at the operating temperature. The cathode is initially heated by joule heating followed by electron emission heating at the operating temperature. The cathode is designed for routine large temperature excursions without being subjected to high thermal stresses. A further characteristic of the device is the elimination of any ceramic components from the high temperature zone of the furnace.

  8. High temperature sensor

    DOE Patents [OSTI]

    Tokarz, Richard D.

    1982-01-01

    A high temperature sensor includes a pair of electrical conductors separated by a mass of electrical insulating material. The insulating material has a measurable resistivity within the sensor that changes in relation to the temperature of the insulating material within a high temperature range (1,000 to 2,000 K.). When required, the sensor can be encased within a ceramic protective coating.

  9. Generation of charge imbalance in a superconductor by a temperature gradient

    SciTech Connect (OSTI)

    Entin-Wohlman, O.; Orbach, R.

    1980-11-01

    The charge-imbalance voltage in a superconductor carrying a current in the presence of a temperature gradient is calculated from the Boltzmann equation in the clean limit. We demonstrate why the Green's-function approach in the dirty limit, first performed by Schmid and Schoem, generates the same Boltzmann-like equation for the distribution function. In addition, the charge-imbalance voltage in the absence of an impressed current is calculated. It is shown to depend on del/sup 2/T+(delT)/sup 2//T, and not solely on (delT)/sup 2/. The calculations are limited to the temperature regime near T/sub c/, such that ..delta..<

  10. Electron Correlation in Iron-Based Superconductors

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

    of the deepest mysteries in modern physics-the mechanism of superconductivity in the copper-based "high-temperature superconductors." One clue lies in whether the electrons in...

  11. High temperature refrigerator

    DOE Patents [OSTI]

    Steyert, Jr., William A.

    1978-01-01

    A high temperature magnetic refrigerator which uses a Stirling-like cycle in which rotating magnetic working material is heated in zero field and adiabatically magnetized, cooled in high field, then adiabatically demagnetized. During this cycle said working material is in heat exchange with a pumped fluid which absorbs heat from a low temperature heat source and deposits heat in a high temperature reservoir. The magnetic refrigeration cycle operates at an efficiency 70% of Carnot.

  12. (Neutron scattering studies of the high-temperature superconducting materials)

    SciTech Connect (OSTI)

    Mook, H.A. Jr.

    1991-01-04

    The traveler was given beam time at the ILL to continue neutron scattering work on high-temperature superconductivity. The unique facilities at the ILL for both high-energy and low-energy neutron instrumentation made the experiments possible. The measurements consisted of two basic types. The first of these is the study of the nature of spin fluctuations in high-{Tc} materials. This work is fundamental to the mechanism that is responsible for the high-transition temperatures. The second consisted of experiments on the flux lattice in high-temperature superconductors. The flux lattice has interesting physics in its own right and is important in understanding the current-carrying capability of superconductors.

  13. High temperature measuring device

    DOE Patents [OSTI]

    Tokarz, Richard D.

    1983-01-01

    A temperature measuring device for very high design temperatures (to 2,000.degree. C.). The device comprises a homogenous base structure preferably in the form of a sphere or cylinder. The base structure contains a large number of individual walled cells. The base structure has a decreasing coefficient of elasticity within the temperature range being monitored. A predetermined quantity of inert gas is confined within each cell. The cells are dimensionally stable at the normal working temperature of the device. Increases in gaseous pressure within the cells will permanently deform the cell walls at temperatures within the high temperature range to be measured. Such deformation can be correlated to temperature by calibrating similarly constructed devices under known time and temperature conditions.

  14. High performance magnetic bearing systems using high temperature superconductors

    DOE Patents [OSTI]

    Abboud, R.G.

    1998-05-05

    Disclosed are a magnetic bearing apparatus and a method for providing at least one stabilizing force in a magnetic bearing structure with a superconducting magnetic assembly and a magnetic assembly, by providing a superconducting magnetic member in the superconducting magnetic assembly with a plurality of domains and arranging said superconducting magnetic member such that at least one domain has a domain C-axis vector alignment angularly disposed relative to a reference axis of the magnetic member in the magnetic assembly. 7 figs.

  15. High performance magnetic bearing systems using high temperature superconductors

    DOE Patents [OSTI]

    Abboud, Robert G.

    1998-01-01

    A magnetic bearing apparatus and a method for providing at least one stabilizing force in a magnetic bearing structure with a superconducting magnetic assembly and a magnetic assembly, by providing a superconducting magnetic member in the superconducting magnetic assembly with a plurality of domains and arranging said superconducting magnetic member such that at least one domain has a domain C-axis vector alignment angularly disposed relative to a reference axis of the magnetic member in the magnetic assembly.

  16. High-temperature sensor

    DOE Patents [OSTI]

    Not Available

    1981-01-29

    A high temperature sensor is described which includes a pair of electrical conductors separated by a mass of electrical insulating material. The insulating material has a measurable resistivity within the sensor that changes in relation to the temperature of the insulating material within a high temperature range (1000 to 2000/sup 0/K). When required, the sensor can be encased within a ceramic protective coating.

  17. Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator

    SciTech Connect (OSTI)

    Zareapour, Parisa; Hayat, Alex; Zhao, Shu Yang F.; Kreshchuk, Michael; Lee, Yong Kiat; Reijnders, Anjan A.; Jain, Achint; Xu, Zhijun; Liu, T. S.; Gu, G. D.; Jia, Shuang; Cava, Robert J.; Burch, Kenneth S.

    2014-12-09

    In this research, high-temperature superconductors exhibit a wide variety of novel excitations. If contacted with a topological insulator, the lifting of spin rotation symmetry in the surface states can lead to the emergence of unconventional superconductivity and novel particles. In pursuit of this possibility, we fabricated high critical-temperature (Tc ~ 85 K) superconductor/topological insulator (Bi?Sr?CaCu?O???/Bi?Te?Se) junctions. Below 75 K, a zero-bias conductance peak (ZBCP) emerges in the differential conductance spectra of this junction. The magnitude of the ZBCP is suppressed at the same rate for magnetic fields applied parallel or perpendicular to the junction. Furthermore, it can still be observed and does not split up to at least 8.5 T. The temperature and magnetic field dependence of the excitation we observe appears to fall outside the known paradigms for a ZBCP.

  18. Evidence for a new excitation at the interface between a high-Tc superconductor and a topological insulator

    SciTech Connect (OSTI)

    Zareapour, Parisa; Xu, Zhijun; Hayat, Alex; Zhao, Shu Yang F.; Kreshchuk, Michael; Lee, Yong Kiat; Reijnders, Anjan A.; Jain, Achint; Liu, T. S.; Gu, G. D.; Jia, Shuang; Cava, Robert J.; Burch, Kenneth S.

    2014-12-09

    High-temperature superconductors exhibit a wide variety of novel excitations. If contacted with a topological insulator, the lifting of spin rotation symmetry in the surface states can lead to the emergence of unconventional superconductivity and novel particles. In pursuit of this possibility, we fabricated high critical-temperature (Tc ~ 85 K) superconductor/topological insulator (Bi?Sr?CaCu?O???/Bi?Te?Se) junctions. Below 75 K, a zero-bias conductance peak (ZBCP) emerges in the differential conductance spectra of this junction. The magnitude of the ZBCP is suppressed at the same rate for magnetic fields applied parallel or perpendicular to the junction. Furthermore, it can still be observed and does not split up to at least 8.5 T. The temperature and magnetic field dependence of the excitation we observe appears to fall outside the known paradigms for a ZBCP.

  19. Low temperature London penetration depth and superfluid density in Fe-based superconductors

    SciTech Connect (OSTI)

    Kim, Hyunsoo

    2013-05-15

    The superconducting gap symmetry of the Fe-based superconductors was studied by measurements and analysis of London penetration depth and super uid density. Tunnel diode resonator technique for these measurements was implemented in a dilution refrigerator allowing for the temperatures down to 50 mK. For the analysis of the super uid density, we used both experimental studies of Al-coated samples and original thermodynamic approach based on Rutgers relation. In three systems studied, we found that the superconducting gap at the optimal doping is best described in multi-gap full gap scenario. By performing experiments on samples with arti#12;cially introduced disorder with heavy ion irradiation, we show that evolution of the superconducting transition temperature and of the super uid density are consistent with full-gap sign changing s#6; superconducting state. The superconducting gap develops strong modulation both in the under-doped and the over-doped regimes. In the terminal hole-doped KFe{sub 2}As{sub 2}, both temperature dependence of the super uid density and its evolution with increase of the scattering rate are consistent with symmetry imposed vertical line nodes in the superconducting gap. By comparative studies of hole-doped (Ba,K)Fe{sub 2}As{sub 2} and electron-doped Ca10-3-8, we show that the superconducting gap modulation in the under-doped regime is intrinsic and is not induced by the coexisting static magnetic order.

  20. Superconductor cable

    DOE Patents [OSTI]

    Allais, Arnaud; Schmidt, Frank; Marzahn, Erik

    2010-05-04

    A superconductor cable is described, having a superconductive flexible cable core (1) , which is laid in a cryostat (2, 3, 4), in which the cable core (1) runs in the cryostat (2, 3, 4) in the form of a wave or helix at room temperature.

  1. High temperature pressure gauge

    DOE Patents [OSTI]

    Echtler, J. Paul; Scandrol, Roy O.

    1981-01-01

    A high temperature pressure gauge comprising a pressure gauge positioned in fluid communication with one end of a conduit which has a diaphragm mounted in its other end. The conduit is filled with a low melting metal alloy above the diaphragm for a portion of its length with a high temperature fluid being positioned in the remaining length of the conduit and in the pressure gauge.

  2. High Temperature ESP Monitoring

    SciTech Connect (OSTI)

    Jack Booker; Brindesh Dhruva

    2011-06-20

    The objective of the High Temperature ESP Monitoring project was to develop a downhole monitoring system to be used in wells with bottom hole well temperatures up to 300C for measuring motor temperature, formation pressure, and formation temperature. These measurements are used to monitor the health of the ESP motor, to track the downhole operating conditions, and to optimize the pump operation. A 220 C based High Temperature ESP Monitoring system was commercially released for sale with Schlumberger ESP motors April of 2011 and a 250 C system with will be commercially released at the end of Q2 2011. The measurement system is now fully qualified, except for the sensor, at 300 C.

  3. High temperature probe

    DOE Patents [OSTI]

    Swan, Raymond A.

    1994-01-01

    A high temperature probe for sampling, for example, smokestack fumes, and is able to withstand temperatures of 3000.degree. F. The probe is constructed so as to prevent leakage via the seal by placing the seal inside the water jacket whereby the seal is not exposed to high temperature, which destroys the seal. The sample inlet of the probe is also provided with cooling fins about the area of the seal to provide additional cooling to prevent the seal from being destroyed. Also, a heated jacket is provided for maintaining the temperature of the gas being tested as it passes through the probe. The probe includes pressure sensing means for determining the flow velocity of an efficient being sampled. In addition, thermocouples are located in various places on the probe to monitor the temperature of the gas passing there through.

  4. Method and apparatus for measuring gravitational acceleration utilizing a high temperature superconducting bearing

    DOE Patents [OSTI]

    Hull, John R.

    2000-01-01

    Gravitational acceleration is measured in all spatial dimensions with improved sensitivity by utilizing a high temperature superconducting (HTS) gravimeter. The HTS gravimeter is comprised of a permanent magnet suspended in a spaced relationship from a high temperature superconductor, and a cantilever having a mass at its free end is connected to the permanent magnet at its fixed end. The permanent magnet and superconductor combine to form a bearing platform with extremely low frictional losses, and the rotational displacement of the mass is measured to determine gravitational acceleration. Employing a high temperature superconductor component has the significant advantage of having an operating temperature at or below 77K, whereby cooling may be accomplished with liquid nitrogen.

  5. HIGH TEMPERATURE THERMOCOUPLE

    DOE Patents [OSTI]

    Eshayu, A.M.

    1963-02-12

    This invention contemplates a high temperature thermocouple for use in an inert or a reducing atmosphere. The thermocouple limbs are made of rhenium and graphite and these limbs are connected at their hot ends in compressed removable contact. The rhenium and graphite are of high purity and are substantially stable and free from diffusion into each other even without shielding. Also, the graphite may be thick enough to support the thermocouple in a gas stream. (AEC)

  6. High temperature thermometric phosphors

    DOE Patents [OSTI]

    Allison, Stephen W.; Cates, Michael R.; Boatner, Lynn A.; Gillies, George T.

    1999-03-23

    A high temperature phosphor consists essentially of a material having the general formula LuPO.sub.4 :Dy.sub.(x),Eu.sub.y) wherein: 0.1 wt %.ltoreq.x.ltoreq.20 wt % and 0.1 wt %.ltoreq.y.ltoreq.20 wt %. The high temperature phosphor is in contact with an article whose temperature is to be determined. The article having the phosphor in contact with it is placed in the environment for which the temperature of the article is to be determined. The phosphor is excited by a laser causing the phosphor to fluoresce. The emission from the phosphor is optically focused into a beam-splitting mirror which separates the emission into two separate emissions, the emission caused by the dysprosium dopant and the emission caused by the europium dopent. The separated emissions are optically filtered and the intensities of the emission are detected and measured. The ratio of the intensity of each emission is determined and the temperature of the article is calculated from the ratio of the intensities of the separate emissions.

  7. High temperature thermometric phosphors

    DOE Patents [OSTI]

    Allison, S.W.; Cates, M.R.; Boatner, L.A.; Gillies, G.T.

    1999-03-23

    A high temperature phosphor consists essentially of a material having the general formula LuPO{sub 4}:Dy{sub x},Eu{sub y} wherein: 0.1 wt % {<=} x {<=} 20 wt % and 0.1 wt % {<=} y {<=} 20 wt %. The high temperature phosphor is in contact with an article whose temperature is to be determined. The article having the phosphor in contact with it is placed in the environment for which the temperature of the article is to be determined. The phosphor is excited by a laser causing the phosphor to fluoresce. The emission from the phosphor is optically focused into a beam-splitting mirror which separates the emission into two separate emissions, the emission caused by the dysprosium dopant and the emission caused by the europium dopant. The separated emissions are optically filtered and the intensities of the emission are detected and measured. The ratio of the intensity of each emission is determined and the temperature of the article is calculated from the ratio of the intensities of the separate emissions. 2 figs.

  8. 3D Charge Order Found in Superconductor

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

    3D Charge Order Found in Superconductor Print Despite 30 years of intense study, the explanation behind the zero-resistance current displayed by high-temperature superconductors (HTSCs) is still shrouded in complexity. HTSCs tend to be heterogeneous materials with multiple phases, and disentangling their various electronic behaviors for analysis can be difficult. At the ALS, researchers used resonant soft x-ray diffraction (RSXD), a technique sensitive to both structure and electronic state at

  9. 3D Charge Order Found in Superconductor

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

    3D Charge Order Found in Superconductor Print Despite 30 years of intense study, the explanation behind the zero-resistance current displayed by high-temperature superconductors (HTSCs) is still shrouded in complexity. HTSCs tend to be heterogeneous materials with multiple phases, and disentangling their various electronic behaviors for analysis can be difficult. At the ALS, researchers used resonant soft x-ray diffraction (RSXD), a technique sensitive to both structure and electronic state at

  10. 3D Charge Order Found in Superconductor

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

    3D Charge Order Found in Superconductor Print Despite 30 years of intense study, the explanation behind the zero-resistance current displayed by high-temperature superconductors (HTSCs) is still shrouded in complexity. HTSCs tend to be heterogeneous materials with multiple phases, and disentangling their various electronic behaviors for analysis can be difficult. At the ALS, researchers used resonant soft x-ray diffraction (RSXD), a technique sensitive to both structure and electronic state at

  11. 3D Charge Order Found in Superconductor

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

    3D Charge Order Found in Superconductor Print Despite 30 years of intense study, the explanation behind the zero-resistance current displayed by high-temperature superconductors (HTSCs) is still shrouded in complexity. HTSCs tend to be heterogeneous materials with multiple phases, and disentangling their various electronic behaviors for analysis can be difficult. At the ALS, researchers used resonant soft x-ray diffraction (RSXD), a technique sensitive to both structure and electronic state at

  12. 3D Charge Order Found in Superconductor

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

    3D Charge Order Found in Superconductor Print Despite 30 years of intense study, the explanation behind the zero-resistance current displayed by high-temperature superconductors (HTSCs) is still shrouded in complexity. HTSCs tend to be heterogeneous materials with multiple phases, and disentangling their various electronic behaviors for analysis can be difficult. At the ALS, researchers used resonant soft x-ray diffraction (RSXD), a technique sensitive to both structure and electronic state at

  13. 3D Charge Order Found in Superconductor

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

    3D Charge Order Found in Superconductor Print Despite 30 years of intense study, the explanation behind the zero-resistance current displayed by high-temperature superconductors (HTSCs) is still shrouded in complexity. HTSCs tend to be heterogeneous materials with multiple phases, and disentangling their various electronic behaviors for analysis can be difficult. At the ALS, researchers used resonant soft x-ray diffraction (RSXD), a technique sensitive to both structure and electronic state at

  14. High temperature detonator

    DOE Patents [OSTI]

    Johnson, James O. (Los Alamos, NM); Dinegar, Robert H. (Los Alamos, NM)

    1988-01-01

    A detonator assembly is provided which is usable at high temperatures about 300.degree. C. A detonator body is provided with an internal volume defining an anvil surface. A first acceptor explosive is disposed on the anvil surface. A donor assembly having an ignition element, an explosive material, and a flying plate, are placed in the body effective to accelerate the flying plate to impact the first acceptor explosive on the anvil for detonating the first acceptor explosive. A second acceptor explosive is eccentrically located in detonation relationship with the first acceptor explosive to thereafter effect detonation of a main charge.

  15. Two Phase Transitions Make a High-Temperature Superconductor

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

    and the small Kerr signal observed in different materials. Here, in this work, three research groups from Berkeley and Stanford report convincing data on the subject using a...

  16. Two Phase Transitions Make a High-Temperature Superconductor

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

    experiments on the pseudogap had rarely been performed; data recently obtained on a bismuth-based cuprate showed that the pseudogap opens rather abruptly below T* and evolves in...

  17. Two Phase Transitions Make a High-Temperature Superconductor

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

    revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach...

  18. New advances in the modeling of high-temperature superconductors

    SciTech Connect (OSTI)

    Freitag, L.; Plassmann, P.; Jones, M.

    1994-03-01

    In this paper, we present a new discrete formulation that maintains discrete invariance and is suitable for use on nonorthogonal meshes. This formulation, unlike its predecessors, allows us to easily use adaptive mesh refinement to concentrate grid points where error contributions are large (near vortex centers). In this way we reduce the total number of grid points required to accurately capture vortex configurations and allow the possibility of solving problems previously considered intractable. To solve these large problems, we require the memory capabilities and computational power of state-of-the-art parallel computers. To use these machines, we have developed scalable libraries for adaptive mesh refinement and partitioning on two-dimensional triangular grids. This general-purpose software uses bisection of the longest side to refine triangles in which error contributions are large. These adaptive meshes are both unstructured and dynamic, and we present a new geometric partitioning, algorithm that strives to minimize communication cost by ensuring good partition aspect ratios. We present computational results showing the efficiency of these adaptive techniques for a superconductivity application.

  19. Two Phase Transitions Make a High-Temperature Superconductor

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

    the probe could permit a strong conclusion on the pseudogap phase transition, the small size of the overall signal previously measured in an yttrium-based cuprate was in strong...

  20. In the OSTI Collections: High-Temperature Superconductors | OSTI...

    Office of Scientific and Technical Information (OSTI)

    requires that their energy and momentum change by appropriate discrete finite amounts. ... can accelerate its electrons so they absorb energy from the field and flow among the ions. ...

  1. Two Phase Transitions Make a High-Temperature Superconductor

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

    Note that various candidate orders for the pseudogap considered in this work give a qualitative agreement with the experiment in varying degrees. Research conducted by: R.-H....

  2. Theory of intertwined orders in high temperature superconductors...

    Office of Scientific and Technical Information (OSTI)

    GrantContract Number: SC00112704 Type: Accepted Manuscript Journal Name: Reviews of Modern Physics Additional Journal Information: Journal Volume: 87; Journal Issue: 2; Journal...

  3. Advanced Conductor Development with High Temperature Superconductors and Carbon Nanotubes

    SciTech Connect (OSTI)

    Holesinger, Terry George

    2015-11-17

    This is a report that describes advanced conductor research performed by LANL in preparation for the Colloquia at the University of New Mexico.

  4. Fine uniform filament superconductors

    DOE Patents [OSTI]

    Riley, Jr., Gilbert N.; Li, Qi; Roberts, Peter R.; Antaya, Peter D.; Seuntjens, Jeffrey M.; Hancock, Steven; DeMoranville, Kenneth L.; Christopherson, Craig J.; Garrant, Jennifer H.; Craven, Christopher A.

    2002-01-01

    A multifilamentary superconductor composite having a high fill factor is formed from a plurality of stacked monofilament precursor elements, each of which includes a low density superconductor precursor monofilament. The precursor elements all have substantially the same dimensions and characteristics, and are stacked in a rectilinear configuration and consolidated to provide a multifilamentary precursor composite. The composite is thereafter thermomechanically processed to provide a superconductor composite in which each monofilament is less than about 50 microns thick.

  5. Josephson junctions in high-T/sub c/ superconductors

    DOE Patents [OSTI]

    Falco, C.M.; Lee, T.W.

    1981-01-14

    The invention includes a high T/sub c/ Josephson sperconducting junction as well as the method and apparatus which provides the junction by application of a closely controlled and monitored electrical discharge to a microbridge region connecting two portions of a superconducting film.

  6. Improved ambient-pressure organic superconductor. [Bis(ethylenedithio)TTF-MX/sub 2/

    DOE Patents [OSTI]

    Williams, J.M.; Wang, Hsien-Hau; Beno, M.A.

    1985-05-29

    Disclosed is a new class of organic superconductors having the formula (ET)/sub 2/MX/sub 2/ wherein ET represents bis(ethylenedithio)-tetrathiafulvalene, M is a metal such as Au, Ag, In, Tl, Rb, Pd and the like and X is a halide. The superconductor (ET)/sub 2/AuI/sub 2/ exhibits a transition temperature of 5/sup 0/K which is high for organic superconductors.

  7. High temperature lubricating process

    DOE Patents [OSTI]

    Taylor, R.W.; Shell, T.E.

    1979-10-04

    It has been difficult to provide adequate lubrication for load bearing, engine components when such engines are operating in excess of about 475/sup 0/C. The present invention is a process for providing a solid lubricant on a load bearing, solid surface, such as in an engine being operated at temperatures in excess of about 475/sup 0/C. The process comprises contacting and maintaining the following steps: a gas phase is provided which includes at least one component reactable in a temperature dependent reaction to form a solid lubricant; the gas phase is contacted with the load bearing surface; the load bearing surface is maintained at a temperature which causes reaction of the gas phase component and the formation of the solid lubricant; and the solid lubricant is formed directly on the load bearing surface. The method is particularly suitable for use with ceramic engines.

  8. High temperature lubricating process

    DOE Patents [OSTI]

    Taylor, Robert W.; Shell, Thomas E.

    1982-01-01

    It has been difficult to provide adaquate lubrication for load bearing, engine components when such engines are operating in excess of about 475.degree. C. The present invention is a process for providing a solid lubricant on a load bearing, solid surface (14), such as in an engine (10) being operated at temperatures in excess of about 475.degree. C. The process comprises contacting and maintaining steps. A gas phase (42) is provided which includes at least one component reactable in a temperature dependent reaction to form a solid lubricant. The gas phase is contacted with the load bearing surface. The load bearing surface is maintained at a temperature which causes reaction of the gas phase component and the formation of the solid lubricant. The solid lubricant is formed directly on the load bearing surface. The method is particularly suitable for use with ceramic engines.

  9. High Temperature Fuel Cell Performance High Temperature Fuel Cell

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

    Performance of of Sulfonated Sulfonated Poly(phenylene Poly(phenylene) Proton) Proton Conducting Conducting Polymers | Department of Energy Cell Performance High Temperature Fuel Cell Performance of of Sulfonated Sulfonated Poly(phenylene Poly(phenylene) Proton) Proton Conducting Conducting Polymers High Temperature Fuel Cell Performance High Temperature Fuel Cell Performance of of Sulfonated Sulfonated Poly(phenylene Poly(phenylene) Proton) Proton Conducting Conducting Polymers Presentation

  10. Narrowband high temperature superconducting receiver for low frequency radio waves

    DOE Patents [OSTI]

    Reagor, David W.

    2001-01-01

    An underground communicating device has a low-noise SQUID using high temperature superconductor components connected to detect a modulated external magnetic flux for outputting a voltage signal spectrum that is related to the varying magnetic flux. A narrow bandwidth filter may be used to select a portion of the voltage signal spectrum that is relatively free of power line noise to output a relatively low noise output signal when operating in a portion of the electromagnetic spectra where such power line noise exists. A demodulator outputs a communication signal, which may be an FM signal, indicative of a modulation on the modulated external magnetic flux.

  11. Maglev vehicles and superconductor technology: Integration of high-speed ground transportation into the air travel system

    SciTech Connect (OSTI)

    Johnson, L.R.; Rote, D.M.; Hull, J.R.; Coffey, H.T.; Daley, J.G.; Giese, R.F.

    1989-04-01

    This study was undertaken to (1) evaluate the potential contribution of high-temperature superconductors (HTSCs) to the technical and economic feasibility of magnetically levitated (maglev) vehicles, (2) determine the status of maglev transportation research in the United States and abroad, (3) identify the likelihood of a significant transportation market for high-speed maglev vehicles, and (4) provide a preliminary assessment of the potential energy and economic benefits of maglev systems. HTSCs should be considered as an enhancing, rather than an enabling, development for maglev transportation because they should improve reliability and reduce energy and maintenance costs. Superconducting maglev transportation technologies were developed in the United States in the late 1960s and early 1970s. Federal support was withdrawn in 1975, but major maglev transportation programs were continued in Japan and West Germany, where full-scale prototypes now carry passengers at speeds of 250 mi/h in demonstration runs. Maglev systems are generally viewed as very-high-speed train systems, but this study shows that the potential market for maglev technology as a train system, e.g., from one downtown to another, is limited. Rather, aircraft and maglev vehicles should be seen as complementing rather than competing transportation systems. If maglev systems were integrated into major hub airport operations, they could become economical in many relatively high-density US corridors. Air traffic congestion and associated noise and pollutant emissions around airports would also be reduced. 68 refs., 26 figs., 16 tabs.

  12. High-temperature-measuring device

    DOE Patents [OSTI]

    Not Available

    1981-01-27

    A temperature measuring device for very high design temperatures (to 2000/sup 0/C) is described. The device comprises a homogenous base structure preferably in the form of a sphere or cylinder. The base structure contains a large number of individual walled cells. The base structure has a decreasing coefficient of elasticity within the temperature range being monitored. A predetermined quantity of inert gas is confined within each cell. The cells are dimensonally stable at the normal working temperature of the device. Increases in gaseous pressure within the cells will permanently deform the cell walls at temperatures within the high temperature range to be measured. Such deformation can be correlated to temperature by calibrating similarly constructed devices under known time and temperature conditions.

  13. Development of YBCO Superconductor for Electric Systems: Cooperative

    Office of Scientific and Technical Information (OSTI)

    Research and Development Final Report, CRADA Number CRD-04-150 (Technical Report) | SciTech Connect Development of YBCO Superconductor for Electric Systems: Cooperative Research and Development Final Report, CRADA Number CRD-04-150 Citation Details In-Document Search Title: Development of YBCO Superconductor for Electric Systems: Cooperative Research and Development Final Report, CRADA Number CRD-04-150 The proposed project will be collaborative in exploration of high temperature

  14. Manufacturing High Temperature Systems

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

    Manufacturing and Scale Up Challenges Joseph Hartvigsen Ceramatec, Inc. National Renewable Energy Laboratory Golden, CO February 28, 2014 Antipode Assertions * Electric power generation is not the limitation - To misquote Jay Leno "Use all you want, we'll make more" - http://atomicinsights.com/2013/02/use-all-the-electricity-you-want-well-make-more.html * High electric costs come from working the demand curve from below rather than above * "Grid Storage" is a misleading

  15. Synthesis of highly phase pure (Bi, Pb)-Sr-Ca-Cu-O superconductor

    DOE Patents [OSTI]

    Dorris, Stephen E.; Poeppel, Roger B.; Prorok, Barton C.; Lanagan, Michael T.; Maroni, Victor A.

    1994-01-01

    An article and method of manufacture of (Bi,Pb)-Sr-Ca-Cu-O superconductor. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi,Pb)-Sr-Ca-Cu-O superconductor.

  16. Synthesis of highly phase pure (Bi, Pb)-Sr-Ca-Cu-O superconductor

    DOE Patents [OSTI]

    Dorris, S.E.; Poeppel, R.B.; Prorok, B.C.; Lanagan, M.T.; Maroni, V.A.

    1994-10-11

    An article and method of manufacture of (Bi,Pb)-Sr-Ca-Cu-O superconductor are disclosed. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi,Pb)-Sr-Ca-Cu-O superconductor. 5 figs.

  17. High Temperature Thermoelectric Materials Characterization for...

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

    the High Temperature Materials Laboratory (HTML) User Program High Temperature ... the High Temperature Materials Laboratory (HTML) User Program 2009 DOE Hydrogen Program ...

  18. Ultra High Temperature | Open Energy Information

    Open Energy Info (EERE)

    Ultra High Temperature Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Sanyal Temperature Classification: Ultra High Temperature Dictionary.png Ultra High...

  19. Aluminum-stabilized NB3SN superconductor

    DOE Patents [OSTI]

    Scanlan, Ronald M.

    1988-01-01

    An aluminum-stabilized Nb.sub.3 Sn superconductor and process for producing same, utilizing ultrapure aluminum. Ductile components are co-drawn with aluminum to produce a conductor suitable for winding magnets. After winding, the conductor is heated to convert it to the brittle Nb.sub.3 Sn superconductor phase, using a temperature high enough to perform the transformation but still below the melting point of the aluminum. This results in reaction of substantially all of the niobium, while providing stabilization and react-in-place features which are beneficial in the fabrication of magnets utilizing superconducting materials.

  20. High temperature turbine engine structure

    DOE Patents [OSTI]

    Boyd, Gary L.

    1990-01-01

    A high temperature turbine engine includes a hybrid ceramic/metallic rotor member having ceramic/metal joint structure. The disclosed joint is able to endure higher temperatures than previously possible, and aids in controlling heat transfer in the rotor member.

  1. High temperature structural insulating material

    DOE Patents [OSTI]

    Chen, W.Y.

    1984-07-27

    A high temperature structural insulating material useful as a liner for cylinders of high temperature engines through the favorable combination of high service temperature (above about 800/sup 0/C), low thermal conductivity (below about 0.2 W/m/sup 0/C), and high compressive strength (above about 250 psi). The insulating material is produced by selecting hollow ceramic beads with a softening temperature above about 800/sup 0/C, a diameter within the range of 20-200 ..mu..m, and a wall thickness in the range of about 2 to 4 ..mu..m; compacting the beads and a compatible silicate binder composition under pressure and sintering conditions to provide the desired structural form with the structure having a closed-cell, compact array of bonded beads.

  2. High temperature structural insulating material

    DOE Patents [OSTI]

    Chen, Wayne Y.

    1987-01-01

    A high temperature structural insulating material useful as a liner for cylinders of high temperature engines through the favorable combination of high service temperature (above about 800.degree. C.), low thermal conductivity (below about 0.2 W/m.degree. C.), and high compressive strength (above about 250 psi). The insulating material is produced by selecting hollow ceramic beads with a softening temperature above about 800.degree. C., a diameter within the range of 20-200 .mu.m, and a wall thickness in the range of about 2-4 .mu.m; compacting the beads and a compatible silicate binder composition under pressure and sintering conditions to provide the desired structural form with the structure having a closed-cell, compact array of bonded beads.

  3. High temperature current mirror amplifier

    DOE Patents [OSTI]

    Patterson, III, Raymond B.

    1984-05-22

    A high temperature current mirror amplifier having biasing means in the transdiode connection of the input transistor for producing a voltage to maintain the base-collector junction reversed-biased and a current means for maintaining a current through the biasing means at high temperatures so that the base-collector junction of the input transistor remained reversed-biased. For accuracy, a second current mirror is provided with a biasing means and current means on the input leg.

  4. Magnetic coherence in cuprate superconductors (Journal Article...

    Office of Scientific and Technical Information (OSTI)

    Subject: 36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; LANTHANUM OXIDES; STRONTIUM OXIDES; COPPER OXIDES; COHERENCE LENGTH; NEUTRON DIFFRACTION; MAGNETIZATION; MAGNETIC ...

  5. Encapsulation of High Temperature Thermoelectric Modules | Department...

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

    Encapsulation of High Temperature Thermoelectric Modules Encapsulation of High Temperature Thermoelectric Modules Presents concept for hermetic encapsulation of TE modules ...

  6. Microstabilized superconductor

    DOE Patents [OSTI]

    Bergmann, W.H.

    1971-08-17

    A microstabilized superconductor comprises a superconducting material of the hard Type II series sized in cross sectional area less than 1000 times the coherence length of the material.

  7. Microstabilized Superconductor

    DOE Patents [OSTI]

    Bergmann, W. H.

    1971-08-17

    A microstabilized superconductor comprises a superconducting material of the hard Type II series sized in cross sectional area less than 1000 times the coherence length of the material.

  8. NMR characterization of sulphur substitution effects in the KxFe2-ySe2-zSz high-Tc superconductor

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Torchetti, D. A.; Imai, T.; Lei, H. C.; Petrovic, C.

    2012-04-17

    We present a⁷⁷ Se NMR study of the effect of S substitution in the high-Tc superconductor KxFe2-ySe2-zSz in a temperature range up to 250 K. We examine two S concentrations, with z=0.8 (Tc~ 26 K) and z=1.6 (nonsuperconducting). The samples containing sulphur exhibit broader NMR line shapes than the KxFe₂Se₂ sample due to local disorder in the Se environment. Our Knight shift ⁷⁷K data indicate that in all samples, uniform spin susceptibility decreases with temperature, and that the magnitude of the Knight shift itself decreases with increased S concentration. In addition, S substitution progressively suppresses low-frequency spin fluctuations. None ofmore » the samples exhibit an enhancement of low-frequency antiferromagnetic spin fluctuations near Tc in 1/T₁T, as seen in FeSe.« less

  9. High temperature lightweight foamed cements

    DOE Patents [OSTI]

    Sugama, Toshifumi

    1989-01-01

    Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed.

  10. High temperature lightweight foamed cements

    DOE Patents [OSTI]

    Sugama, Toshifumi.

    1989-10-03

    Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed. 3 figs.

  11. High temperature electronic gain device

    DOE Patents [OSTI]

    McCormick, J. Byron; Depp, Steven W.; Hamilton, Douglas J.; Kerwin, William J.

    1979-01-01

    An integrated thermionic device suitable for use in high temperature, high radiation environments. Cathode and control electrodes are deposited on a first substrate facing an anode on a second substrate. The substrates are sealed to a refractory wall and evacuated to form an integrated triode vacuum tube.

  12. Temperature controlled high voltage regulator

    DOE Patents [OSTI]

    Chiaro, Jr., Peter J.; Schulze, Gerald K.

    2004-04-20

    A temperature controlled high voltage regulator for automatically adjusting the high voltage applied to a radiation detector is described. The regulator is a solid state device that is independent of the attached radiation detector, enabling the regulator to be used by various models of radiation detectors, such as gas flow proportional radiation detectors.

  13. Apex oxygen and critical temperature in copper oxide superconductors: Universal correlation with the stability of local singlets

    SciTech Connect (OSTI)

    Ohta, Y.; Tohyama, T.; Maekawa, S. )

    1991-02-01

    Electronic-energy-level structures of the layered Cu oxide compounds are drawn within the ionic model. Correlations between the level separations obtained and the superconducting critical temperature {ital T}{sub {ital c}} are examined for all families of the Cu oxide superconductors. It is proposed that the position of the energy level of the apex oxygen atoms is of primary importance for the electronic states of the CuO{sub 2} plane and governs the optimum {ital T}{sub {ital c}}'s of all families of hole-carrier suprconductors. The pressure effect of {ital T}{sub {ital c}} is discussed within this framework. Based on cluster-model calculations, where the covalency neglected in the ionic model is fully taken into account, we argue that the role of the apex oxygen atoms is to prescribe the stability of local singlet states made of two holes in the Cu 3{ital d}{sub {ital x}}{sup 2}{minus}{ital y}{sup 2} and O 2{ital p}{sub {sigma}} orbitals of the CuO{sub 2} plane, and thereby to control the maximum {ital T}{sub {ital c}} of each family.

  14. High temperature current mirror amplifier

    DOE Patents [OSTI]

    Patterson, R.B. III.

    1984-05-22

    Disclosed is a high temperature current mirror amplifier having biasing means in the transdiode connection of the input transistor for producing a voltage to maintain the base-collector junction reversed-biased and a current means for maintaining a current through the biasing means at high temperatures so that the base-collector junction of the input transistor remained reversed-biased. For accuracy, a second current mirror is provided with a biasing means and current means on the input leg. 2 figs.

  15. High temperature turbine engine structure

    DOE Patents [OSTI]

    Boyd, Gary L.

    1991-01-01

    A high temperature turbine engine includes a rotor portion having axially stacked adjacent ceramic rotor parts. A ceramic/ceramic joint structure transmits torque between the rotor parts while maintaining coaxial alignment and axially spaced mutually parallel relation thereof despite thermal and centrifugal cycling.

  16. Splicing of Superconductor Materials - Energy Innovation Portal

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

    Advanced Materials Advanced Materials Find More Like This Return to Search Splicing of Superconductor Materials Brookhaven National Laboratory Contact BNL About This Technology Technology Marketing Summary Low resistance splices are needed to join high temperature superconducting (HTS) materials in order to fabricate large-scale magnets for example, for accelerator, energy storage and medical applications. If the splice resistance is too high, the thermal, mechanical and electrical properties

  17. Low Cost, High Temperature, High Ripple Current DC Bus Capacitors...

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

    Low Cost, High Temperature, High Ripple Current DC Bus Capacitors Low Cost, High Temperature, High Ripple Current DC Bus Capacitors 2010 DOE Vehicle Technologies and Hydrogen...

  18. High-pressure, high-temperature plastic deformation of sintered...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: High-pressure, high-temperature plastic deformation of sintered diamonds Citation Details In-Document Search Title: High-pressure, high-temperature plastic ...

  19. High temperature two component explosive

    DOE Patents [OSTI]

    Mars, James E.; Poole, Donald R.; Schmidt, Eckart W.; Wang, Charles

    1981-01-01

    A two component, high temperature, thermally stable explosive composition comprises a liquid or low melting oxidizer and a liquid or low melting organic fuel. The oxidizer and fuel in admixture are incapable of substantial spontaneous exothermic reaction at temperatures on the order of 475.degree. K. At temperatures on the order of 475.degree. K., the oxidizer and fuel in admixture have an activation energy of at least about 40 kcal/mol. As a result of the high activation energy, the preferred explosive compositions are nondetonable as solids at ambient temperature, and become detonable only when heated beyond the melting point. Preferable oxidizers are selected from alkali or alkaline earth metal nitrates, nitrites, perchlorates, and/or mixtures thereof. Preferred fuels are organic compounds having polar hydrophilic groups. The most preferred fuels are guanidinium nitrate, acetamide and mixtures of the two. Most preferred oxidizers are eutectic mixtures of lithium nitrate, potassium nitrate and sodium nitrate, of sodium nitrite, sodium nitrate and potassium nitrate, and of potassium nitrate, calcium nitrate and sodium nitrate.

  20. High Temperature Heat Exchanger Project

    SciTech Connect (OSTI)

    Anthony E. Hechanova, Ph.D.

    2008-09-30

    The UNLV Research Foundation assembled a research consortium for high temperature heat exchanger design and materials compatibility and performance comprised of university and private industry partners under the auspices of the US DOE-NE Nuclear Hydrogen Initiative in October 2003. The objectives of the consortium were to conduct investigations of candidate materials for high temperature heat exchanger componets in hydrogen production processes and design and perform prototypical testing of heat exchangers. The initial research of the consortium focused on the intermediate heat exchanger (located between the nuclear reactor and hydrogen production plan) and the components for the hydrogen iodine decomposition process and sulfuric acid decomposition process. These heat exchanger components were deemed the most challenging from a materials performance and compatibility perspective

  1. High pressure and high temperature apparatus

    DOE Patents [OSTI]

    Voronov, Oleg A.

    2005-09-13

    A design for high pressure/high temperature apparatus and reaction cell to achieve .about.30 GPa pressure in .about.1 cm volume and .about.100 GPa pressure in .about.1 mm volumes and 20-5000.degree. C. temperatures in a static regime. The device includes profiled anvils (28) action on a reaction cell (14, 16) containing the material (26) to be processed. The reaction cell includes a heater (18) surrounded by insulating layers and screens. Surrounding the anvils are cylindrical inserts and supporting rings (30-48) whose hardness increases towards the reaction cell. These volumes may be increased considerably if applications require it, making use of presses that have larger loading force capability, larger frames and using larger anvils.

  2. HIGH TEMPERATURE MICROSCOPE AND FURNACE

    DOE Patents [OSTI]

    Olson, D.M.

    1961-01-31

    A high-temperature microscope is offered. It has a reflecting optic situated above a molten specimen in a furnace and reflecting the image of the same downward through an inert optic member in the floor of the furnace, a plurality of spaced reflecting plane mirrors defining a reflecting path around the furnace, a standard microscope supported in the path of and forming the end terminus of the light path.

  3. High temperature turbine engine structure

    DOE Patents [OSTI]

    Carruthers, William D.; Boyd, Gary L.

    1992-01-01

    A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

  4. High temperature turbine engine structure

    DOE Patents [OSTI]

    Carruthers, William D.; Boyd, Gary L.

    1993-01-01

    A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

  5. High temperature turbine engine structure

    DOE Patents [OSTI]

    Carruthers, William D.; Boyd, Gary L.

    1994-01-01

    A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

  6. Superconductor Composite

    DOE Patents [OSTI]

    Dorris, Stephen E.; Burlone, Dominick A.; Morgan; Carol W.

    1999-02-02

    A superconducting conductor fabricated from a plurality of wires, e.g., fine silver wires, coated with a superconducting powder. A process of applying superconducting powders to such wires, to the resulting coated wires and superconductors produced therefrom.

  7. Nanostructured High Temperature Bulk Thermoelectric Energy Conversion...

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

    High Temperature Bulk Thermoelectric Energy Conversion for Efficient Waste Heat Recovery Nanostructured High Temperature Bulk Thermoelectric Energy Conversion for Efficient Waste ...

  8. High-Temperature Superconductivity Cable Demonstration Projects...

    Energy Savers [EERE]

    High-Temperature Superconductivity Cable Demonstration Projects High-Temperature Superconductivity Cable Demonstration Projects A National Effort to Introduce New Technology into ...

  9. Improved Martensitic Steel for High Temperature Applications...

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

    Improved Martensitic Steel for High Temperature Applications A stainless steel composition and heat treatment process for a high-temperature, titanium alloyed 9 Cr-1 molybdenum ...

  10. High-Temperature Thermoelectric Materials Characterization for...

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

    High-Temperature Thermoelectric Materials Characterization for Automotive Waste Heat Recovery: Success Stories from the High Temperature Materials Laboratory (HTML) User Program...

  11. High thermoelectric figure of merit in nanocrystalline polyaniline at low temperatures

    SciTech Connect (OSTI)

    Nath, Chandrani; Kumar, Ashok E-mail: okram@csr.res.in; Kuo, Yung-Kang; Okram, Gunadhor Singh E-mail: okram@csr.res.in

    2014-09-29

    Thermoelectric coolers with figure of merit (ZT) close to unity at low temperatures are the need of the hour with new advances in high temperature superconductors, superconducting microelectronic circuits, quantum computers, and photonics. Here, we demonstrate that the conducting polymer polyaniline (Pani) doped with camphor sulfonic acid synthesized in semi-crystalline nanostructures, possesses a giant Seebeck effect at low temperatures. The resulting enormously large Seebeck coefficient (up to 0.6 V/K) combined with an intrinsically low electrical conductivity and thermal conductivity give rise to a ZT = 0.77 at 45 K and ZT = 2.17 at 17 K.

  12. High-Temperature-High-Volume Lifting for Enhanced Geothermal...

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

    More Documents & Publications High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems High-Temperature Motor Windings for Downhole Pumps Used in Geothermal Energy ...

  13. High temperature sealed electrochemical cell

    DOE Patents [OSTI]

    Valentin Chung, Brice Hoani; Burke, Paul J.; Sadoway, Donald R.

    2015-10-06

    A cell for high temperature electrochemical reactions is provided. The cell includes a container, at least a portion of the container acting as a first electrode. An extension tube has a first end and a second end, the extension tube coupled to the container at the second end forming a conduit from the container to said first end. A second electrode is positioned in the container and extends out of the container via the conduit. A seal is positioned proximate the first end of the extension tube, for sealing the cell.

  14. CONFINEMENT OF HIGH TEMPERATURE PLASMA

    DOE Patents [OSTI]

    Koenig, H.R.

    1963-05-01

    The confinement of a high temperature plasma in a stellarator in which the magnetic confinement has tended to shift the plasma from the center of the curved, U-shaped end loops is described. Magnetic means are provided for counteracting this tendency of the plasma to be shifted away from the center of the end loops, and in one embodiment this magnetic means is a longitudinally extending magnetic field such as is provided by two sets of parallel conductors bent to follow the U-shaped curvature of the end loops and energized oppositely on the inside and outside of this curvature. (AEC)

  15. Detection of surface impurity phases in high T.sub.C superconductors using thermally stimulated luminescence

    DOE Patents [OSTI]

    Cooke, D. Wayne; Jahan, Muhammad S.

    1989-01-01

    Detection of surface impurity phases in high-temperature superconducting materials. Thermally stimulated luminescence has been found to occur in insulating impurity phases which commonly exist in high-temperature superconducting materials. The present invention is sensitive to impurity phases occurring at a level of less than 1% with a probe depth of about 1 .mu.m which is the region of interest for many superconductivity applications. Spectroscopic and spatial resolution of the emitted light from a sample permits identification and location of the impurity species. Absence of luminescence, and thus of insulating phases, can be correlated with low values of rf surface resistance.

  16. Materials Characterization Capabilities at the High Temperature...

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

    Temperature Materials Laboratory (HTML) User Program Materials Characterization Capabilities at the High Temperature Materials Laboratory and HTML User Program Success Stories ...

  17. System and method for quench and over-current protection of superconductor

    DOE Patents [OSTI]

    Huang, Xianrui; Laskaris, Evangelos Trifon; Sivasubramaniam, Kiruba Haran; Bray, James William; Ryan, David Thomas; Fogarty, James Michael; Steinbach, Albert Eugene

    2005-05-31

    A system and method for protecting a superconductor. The system may comprise a current sensor operable to detect a current flowing through the superconductor. The system may comprise a coolant temperature sensor operable to detect the temperature of a cryogenic coolant used to cool the superconductor to a superconductive state. The control circuit is operable to estimate the superconductor temperature based on the current flow and the coolant temperature. The system may also be operable to compare the estimated superconductor temperature to at least one threshold temperature and to initiate a corrective action when the superconductor temperature exceeds the at least one threshold temperature.

  18. Faraday imaging at high temperatures

    DOE Patents [OSTI]

    Hackel, L.A.; Reichert, P.

    1997-03-18

    A Faraday filter rejects background light from self-luminous thermal objects, but transmits laser light at the passband wavelength, thus providing an ultra-narrow optical bandpass filter. The filter preserves images so a camera looking through a Faraday filter at a hot target illuminated by a laser will not see the thermal radiation but will see the laser radiation. Faraday filters are useful for monitoring or inspecting the uranium separator chamber in an atomic vapor laser isotope separation process. Other uses include viewing welds, furnaces, plasma jets, combustion chambers, and other high temperature objects. These filters are can be produced at many discrete wavelengths. A Faraday filter consists of a pair of crossed polarizers on either side of a heated vapor cell mounted inside a solenoid. 3 figs.

  19. Faraday imaging at high temperatures

    DOE Patents [OSTI]

    Hackel, Lloyd A.; Reichert, Patrick

    1997-01-01

    A Faraday filter rejects background light from self-luminous thermal objects, but transmits laser light at the passband wavelength, thus providing an ultra-narrow optical bandpass filter. The filter preserves images so a camera looking through a Faraday filter at a hot target illuminated by a laser will not see the thermal radiation but will see the laser radiation. Faraday filters are useful for monitoring or inspecting the uranium separator chamber in an atomic vapor laser isotope separation process. Other uses include viewing welds, furnaces, plasma jets, combustion chambers, and other high temperature objects. These filters are can be produced at many discrete wavelengths. A Faraday filter consists of a pair of crossed polarizers on either side of a heated vapor cell mounted inside a solenoid.

  20. High temperature control rod assembly

    SciTech Connect (OSTI)

    Vollman, Russell E.

    1991-01-01

    A high temperature nuclear control rod assembly comprises a plurality of substantially cylindrical segments flexibly joined together in succession by ball joints. The segments are made of a high temperature graphite or carbon-carbon composite. The segment includes a hollow cylindrical sleeve which has an opening for receiving neutron-absorbing material in the form of pellets or compacted rings. The sleeve has a threaded sleeve bore and outer threaded surface. A cylindrical support post has a threaded shaft at one end which is threadably engaged with the sleeve bore to rigidly couple the support post to the sleeve. The other end of the post is formed with a ball portion. A hollow cylindrical collar has an inner threaded surface engageable with the outer threaded surface of the sleeve to rigidly couple the collar to the sleeve. the collar also has a socket portion which cooperates with the ball portion to flexibly connect segments together to form a ball and socket-type joint. In another embodiment, the segment comprises a support member which has a threaded shaft portion and a ball surface portion. The threaded shaft portion is engageable with an inner threaded surface of a ring for rigidly coupling the support member to the ring. The ring in turn has an outer surface at one end which is threadably engageably with a hollow cylindrical sleeve. The other end of the sleeve is formed with a socket portion for engagement with a ball portion of the support member. In yet another embodiment, a secondary rod is slidably inserted in a hollow channel through the center of the segment to provide additional strength. A method for controlling a nuclear reactor utilizing the control rod assembly is also included.

  1. High-temperature Pump Monitoring - High-temperature ESP Monitoring...

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

    DOE 2010 Geothermal Technologies Program Peer Review hightemp018dhruva.pdf (188.95 KB) More Documents & Publications Development of Tools for Measuring Temperature, Flow, ...

  2. Method for preparing superconductors

    DOE Patents [OSTI]

    Dahlgren, Shelley D.

    1976-01-01

    A superconductor having an equiaxed fine grain beta-tungsten crystalline structure found to have improved high field critical current densities is prepared by sputter-depositing superconductive material onto a substrate cooled to below 200.degree. C. and heat-treating the deposited material.

  3. Electron Correlation in Iron-Based Superconductors

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

    Electron Correlation in Iron-Based Superconductors Electron Correlation in Iron-Based Superconductors Print Wednesday, 24 February 2010 00:00 In 2008, the discovery of iron-based superconductors stimulated a worldwide burst of activity, leading to about two preprints per day ever since. With a maximum superconducting transition temperature (so far) of 55 K, it is natural to wonder if studying the new materials will help uncover one of the deepest mysteries in modern physics-the mechanism of

  4. Thermal disconnect for high-temperature batteries

    DOE Patents [OSTI]

    Jungst, Rudolph George; Armijo, James Rudolph; Frear, Darrel Richard

    2000-01-01

    A new type of high temperature thermal disconnect has been developed to protect electrical and mechanical equipment from damage caused by operation at extreme temperatures. These thermal disconnects allow continuous operation at temperatures ranging from 250.degree. C. to 450.degree. C., while rapidly terminating operation at temperatures 50.degree. C. to 150.degree. C. higher than the continuous operating temperature.

  5. High-Pressure and High-Temperature Powder Diffraction (Journal...

    Office of Scientific and Technical Information (OSTI)

    High-Pressure and High-Temperature Powder Diffraction Citation Details In-Document Search Title: High-Pressure and High-Temperature Powder Diffraction Authors: Fei, Yingwei ; Wang, ...

  6. High Temperature, High Pressure Devices for Zonal Isolation in Geothermal

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

    Wells | Department of Energy High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells fabian_ctd_ zonal_isolation_peer2013.pdf (809.57 KB) More Documents & Publications High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells track 3: enhanced geothermal systems (EGS) | geothermal 2015

  7. Aluminum-stabilized Nb/sub 3/Sn superconductor

    DOE Patents [OSTI]

    Scanlan, R.M.

    1984-02-10

    This patent discloses an aluminum-stabilized Nb/sub 3/Sn superconductor and process for producing same, utilizing ultrapure aluminum. Ductile components are co-drawn with aluminum to produce a conductor suitable for winding magnets. After winding, the conductor is heated to convert it to the brittle Nb/sub 3/Sn superconductor phase, using a temperature high enough to perform the transformation but still below the melting point of the aluminum. This results in reaction of substantially all of the niobium, while providing stabilization and react-in-place features which are beneficial in the fabrication of magnets utilizing superconducting materials.

  8. Aluminum-stabilized Nb[sub 3]Sn superconductor

    DOE Patents [OSTI]

    Scanlan, R.M.

    1988-05-10

    Disclosed are an aluminum-stabilized Nb[sub 3]Sn superconductor and process for producing same, utilizing ultrapure aluminum. Ductile components are co-drawn with aluminum to produce a conductor suitable for winding magnets. After winding, the conductor is heated to convert it to the brittle Nb[sub 3]Sn superconductor phase, using a temperature high enough to perform the transformation but still below the melting point of the aluminum. This results in reaction of substantially all of the niobium, while providing stabilization and react-in-place features which are beneficial in the fabrication of magnets utilizing superconducting materials. 4 figs.

  9. High-temperature thermocouples and related methods

    DOE Patents [OSTI]

    Rempe, Joy L.; Knudson, Darrell L.; Condie, Keith G.; Wilkins, S. Curt

    2011-01-18

    A high-temperature thermocouple and methods for fabricating a thermocouple capable of long-term operation in high-temperature, hostile environments without significant signal degradation or shortened thermocouple lifetime due to heat induced brittleness.

  10. High Temperature Superconducting Underground Cable

    SciTech Connect (OSTI)

    Farrell, Roger, A.

    2010-02-28

    The purpose of this Project was to design, build, install and demonstrate the technical feasibility of an underground high temperature superconducting (HTS) power cable installed between two utility substations. In the first phase two HTS cables, 320 m and 30 m in length, were constructed using 1st generation BSCCO wire. The two 34.5 kV, 800 Arms, 48 MVA sections were connected together using a superconducting joint in an underground vault. In the second phase the 30 m BSCCO cable was replaced by one constructed with 2nd generation YBCO wire. 2nd generation wire is needed for commercialization because of inherent cost and performance benefits. Primary objectives of the Project were to build and operate an HTS cable system which demonstrates significant progress towards commercial progress and addresses real world utility concerns such as installation, maintenance, reliability and compatibility with the existing grid. Four key technical areas addressed were the HTS cable and terminations (where the cable connects to the grid), cryogenic refrigeration system, underground cable-to-cable joint (needed for replacement of cable sections) and cost-effective 2nd generation HTS wire. This was the worlds first installation and operation of an HTS cable underground, between two utility substations as well as the first to demonstrate a cable-to-cable joint, remote monitoring system and 2nd generation HTS.

  11. High Temperature Superconductivity Partners | Department of Energy

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

    High Temperature Superconductivity Partners Map showing DOE's partnersstakeholders in the ... More Documents & Publications DOE Superconductivity Program Stakeholders DOE Provides up ...

  12. Materials Characterization Capabilities at the High Temperature...

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

    Lightweighting Materials Materials Characterization Capabilities at the High Temperature Materials Laboratory: Focus Lightweighting Materials 2011 DOE Hydrogen and Fuel Cells ...

  13. Materials Characterization Capabilities at the High Temperature...

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

    More Documents & Publications Materials Characterization Capabilities at the High Temperature Materials Laboratory and HTML User Program Success Stories Materials Characterization ...

  14. Compensated electron and hole pickets in an underdoped high Tc superconductor

    SciTech Connect (OSTI)

    Harrison, Neil; Altarawneh, Moaz M; Mielke, Charles H; Sebastian, Suchitra E; Goddard, P A; Liang, Ruixing; Bonn, D A; Hardy, W N; Andersen, O K; Lonzarich, G G

    2010-01-01

    Important to the question of high temperature superconductivity is whether bound fermionic pairs with zero or finite momentum - exhibiting bosonic physics - are involved. Here we use angle-dependent magnetic quantum oscillation measurements in underdoped YBa{sub 2}Cu{sub 3}O{sub 6+x} to reveal two significantly differently corrugated small sections of Fermi surface, identifying them as comprising opposite carriers located at different locations of the Brillouin zone. The surprising finding that these disproportionately heavy small pockets are equal in size indicates they are prone to a finite momentum excitonic insulator instability. We discuss the possibility that reducing the doping drives YBa{sub 2}Cu{sub 3}O{sub 6+x} closer to an instability of this nature, its ultimate realization occuring at the metal-insulator quantum critical point, accompanied by a potential enhancement of superconducting transition temperatures.

  15. Measurement of thermodynamic temperature of high temperature fixed points

    SciTech Connect (OSTI)

    Gavrilov, V. R.; Khlevnoy, B. B.; Otryaskin, D. A.; Grigorieva, I. A.; Samoylov, M. L.; Sapritsky, V. I.

    2013-09-11

    The paper is devoted to VNIIOFI's measurements of thermodynamic temperature of the high temperature fixed points Co-C, Pt-C and Re-C within the scope of the international project coordinated by the Consultative Committee for Thermometry working group 5 'Radiation Thermometry'. The melting temperatures of the fixed points were measured by a radiance mode radiation thermometer calibrated against a filter radiometer with known irradiance spectral responsivity via a high temperature black body. This paper describes the facility used for the measurements, the results and estimated uncertainties.

  16. New MIT design revives interest in high-field approach to fusion

    SciTech Connect (OSTI)

    Kramer, David

    2015-10-15

    Tokamaks made with high-temperature superconductors may offer a less expensive, more compact route to fusion power, if their coils can withstand the tremendous forces.

  17. Radiation detector using a bulk high T[sub c] superconductor

    DOE Patents [OSTI]

    Artuso, J.F.; Franks, L.A.; Hull, K.L.; Symko, O.G.

    1993-12-07

    A radiation detector is provided, wherein a bulk high T[sub c] superconducting sample is placed in a magnetic field and maintained at a superconducting temperature. Photons of incident radiation will cause localized heating in superconducting loops of the sample destroying trapped flux and redistributing the fluxons, and reducing the critical current of the loops. Subsequent cooling of the sample in the magnetic field will cause trapped flux redistributed Abrikosov fluxons and trapped Josephson fluxons. The destruction and trapping of the fluxons causes changes in the magnetization of the sample inducing currents in opposite directions in a pickup coil which is coupled by an input coil to an rf SQUID. 4 figures.

  18. Superconductor cable

    DOE Patents [OSTI]

    Smith, Jr., Darrell F.; Lake, Bill L.; Ballinger, Ronald G.

    1988-01-01

    A superconducting cable comprising an in-situ-formed type II superconductor, e.g. Nb.sub.3 Sn, in association with a stabilizing conductor both in heat transfer relationship with at least one passage adapted to carry liquified gaseous refrigerant. The conductor and said at least one passage are enclosed by a sheath comprising an alloy consisting essentially of about 49% nickel, about 4% chromium, about 3% niobium, about 1.4% titanium, about 1% aluminum, balance essentially iron.

  19. Deep Trek High Temperature Electronics Project

    SciTech Connect (OSTI)

    Bruce Ohme

    2007-07-31

    This report summarizes technical progress achieved during the cooperative research agreement between Honeywell and U.S. Department of Energy to develop high-temperature electronics. Objects of this development included Silicon-on-Insulator (SOI) wafer process development for high temperature, supporting design tools and libraries, and high temperature integrated circuit component development including FPGA, EEPROM, high-resolution A-to-D converter, and a precision amplifier.

  20. High Temperature ESP Monitoring | Department of Energy

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

    The purpose of the High Temperature ESP Monitoring project is to develop a down-hole monitoring system to be used in wells with bottom hole temperature up to 300 C for measuring ...

  1. Preparation of superconductor precursor powders

    DOE Patents [OSTI]

    Bhattacharya, Raghunath

    1998-01-01

    A process for the preparation of a precursor metallic powder composition for use in the subsequent formation of a superconductor. The process comprises the steps of providing an electrodeposition bath comprising an electrolyte medium and a cathode substrate electrode, and providing to the bath one or more soluble salts of one or more respective metals which are capable of exhibiting superconductor properties upon subsequent appropriate treatment. The bath is continually energized to cause the metallic and/or reduced particles formed at the electrode to drop as a powder from the electrode into the bath, and this powder, which is a precursor powder for superconductor production, is recovered from the bath for subsequent treatment. The process permits direct inclusion of all metals in the preparation of the precursor powder, and yields an amorphous product mixed on an atomic scale to thereby impart inherent high reactivity. Superconductors which can be formed from the precursor powder include pellet and powder-in-tube products.

  2. Simultaneous constraint and phase conversion processing of oxide superconductors

    DOE Patents [OSTI]

    Li, Qi; Thompson, Elliott D.; Riley, Jr., Gilbert N.; Hellstrom, Eric E.; Larbalestier, David C.; DeMoranville, Kenneth L.; Parrell, Jeffrey A.; Reeves, Jodi L.

    2003-04-29

    A method of making an oxide superconductor article includes subjecting an oxide superconductor precursor to a texturing operation to orient grains of the oxide superconductor precursor to obtain a highly textured precursor; and converting the textured oxide superconducting precursor into an oxide superconductor, while simultaneously applying a force to the precursor which at least matches the expansion force experienced by the precursor during phase conversion to the oxide superconductor. The density and the degree of texture of the oxide superconductor precursor are retained during phase conversion. The constraining force may be applied isostatically.

  3. Manufacturing Barriers to High Temperature PEM Commercialization |

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

    Department of Energy Barriers to High Temperature PEM Commercialization Manufacturing Barriers to High Temperature PEM Commercialization Presented at the NREL Hydrogen and Fuel Cell Manufacturing R&D Workshop in Washington, DC, August 11-12, 2011. Manufacturing Barriers to High Temperature PEM Commercialization (785.02 KB) More Documents & Publications PBI-Phosphoric Acid Based Membrane Electrode Assemblies: Status Update MCFC and PAFC R&D Workshop Summary Report 2012 Pathways to

  4. Electrolysis - High Temperature - Hydrogen - Energy Innovation Portal

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

    Electrolysis - High Temperature - Hydrogen Idaho National Laboratory Contact INL About This Technology Technology Marketing Summary INL has developed a high-temperature process the utilizes solid oxide fuel cells that are operated in the electrolytic mode. The first process includes combining a high-temperature heat source (e.g. nuclear reactor) with a hydrogen production facility by taking a stream of water and heating it and then splitting the water into hydrogen and oxygen product streams. A

  5. Radiation detector using a bulk high T.sub.c superconductor

    DOE Patents [OSTI]

    Artuso, Joseph F. (Santa Barbara, CA); Franks, Larry A. (Santa Barbara, CA); Hull, Kenneth L. (Ventura, CA); Symko, Orest G. (Salt Lake City, UT)

    1993-01-01

    A radiation detector (10) is provided, wherein a bulk high T.sub.c superconducting sample (11) is placed in a magnetic field and maintained at a superconducting temperature. Photons of incident radiation will cause localized heating in superconducting loops of the sample destroying trapped flux and redistributing the fluxons, and reducing the critical current of the loops. Subsequent cooling of the sample in the magnetic field will cause trapped flux redistributed Abrikosov fluxons and trapped Josephson fluxons. The destruction and trapping of the fluxons causes changes in the magnetization of the sample inducing currents in opposite directions in a pickup coil (12) which is coupled by an input coil (15) to an rf SQUID (16).

  6. High-temperature superconductivity: A conventional conundrum...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: High-temperature superconductivity: A conventional conundrum Citation ... OSTI Identifier: 1245373 Report Number(s): BNL--111729-2016-JA Journal ID: ISSN 1745-2473; ...

  7. Materials Characterization Capabilities at the High Temperature...

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

    Laboratory and HTML User Program Success Stories Materials Characterization Capabilities at the High Temperature Materials Laboratory and HTML User Program Success Stories 2012 DOE ...

  8. Materials Characterization Capabilities at the High Temperature...

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

    Materials Laboratory and HTML User Program Success Stories Materials Characterization Capabilities at the High Temperature Materials Laboratory and HTML User Program Success ...

  9. Quantitative Modeling of High Temperature Magnetization Dynamics

    SciTech Connect (OSTI)

    Zhang, Shufeng

    2009-03-01

    Final Technical Report Project title: Quantitative Modeling of High Temperature Magnetization Dynamics DOE/Office of Science Program Manager Contact: Dr. James Davenport

  10. High-temperature brazed ceramic joints

    DOE Patents [OSTI]

    Jarvinen, Philip O.

    1986-01-01

    High-temperature joints formed from metallized ceramics are disclosed wherein the metal coatings on the ceramics are vacuum sputtered thereon.

  11. Materials Characterization Capabilities at the High Temperature...

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

    -- Washington D.C. PDF icon lm028laracurzio2010o.pdf More Documents & Publications Materials Characterization Capabilities at the High Temperature Materials Laboratory and...

  12. High Temperature, High Voltage Fully Integrated Gate Driver Circuit...

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

    D.C. PDF icon ape003tolbert2010p.pdf More Documents & Publications High Temperature, High Voltage Fully Integrated Gate Driver Circuit Wide Bandgap Materials Smart ...

  13. High Temperature, High Voltage Fully Integrated Gate Driver Circuit...

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

    -- Washington D.C. PDF icon ape03marlino.pdf More Documents & Publications High Temperature, High Voltage Fully Integrated Gate Driver Circuit Smart Integrated Power Module ...

  14. High Temperature, High Pressure Devices for Zonal Isolation in...

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

    High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells track 3: enhanced geothermal systems (EGS) | geothermal 2015 peer review Complete FiberCopper Cable ...

  15. High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems presentation at the April 2013 peer review meeting held in Denver, Colorado.

  16. High Temperature Superconducting Reciprocating Magnetic Separator Final Report

    SciTech Connect (OSTI)

    James F. Maguire

    2008-06-05

    In 2001, under DOE's Superconductivity Partnership Initiative (SPI), E. I. du Pont de Nemours & Co. (Dupont) was awarded a cost-share contract to build a fully functional full-scale model high temperature superconducting reciprocating magnet unit specifically designed for the koalin clay industry. After competitive bidding, American Superconductor (AMSC) was selected to provide the coil for the magnet. Dupont performed the statement of work until September 2004, when it stopped work, with the concurrence of DOE, due to lack of federal funds. DOE had paid all invoices to that point, and Dupont had provided all cost share. At this same time, Dupont determined that this program did not fit with its corporate strategies and notified DOE that it was not interesting in resuming the program when funding became available. AMSC expressed interest in assuming performance of the Agreement to Dupont and DOE, and in March 2005, this project was transferred to AMSC by DOE amendment to the original contract and Novation Agreement between AMSC and Dupont. Design drawings and some hardware components and subassemblies were transferred to AMSC. However, no funding was obligated by DOE and AMSC never performed work on the project. This report contains a summary of the work performed by Dupont up to the September 04 timeframe.

  17. Investigations into High Temperature Components and Packaging

    SciTech Connect (OSTI)

    Marlino, L.D.; Seiber, L.E.; Scudiere, M.B.; M.S. Chinthavali, M.S.; McCluskey, F.P.

    2007-12-31

    The purpose of this report is to document the work that was performed at the Oak Ridge National Laboratory (ORNL) in support of the development of high temperature power electronics and components with monies remaining from the Semikron High Temperature Inverter Project managed by the National Energy Technology Laboratory (NETL). High temperature electronic components are needed to allow inverters to operate in more extreme operating conditions as required in advanced traction drive applications. The trend to try to eliminate secondary cooling loops and utilize the internal combustion (IC) cooling system, which operates with approximately 105 C water/ethylene glycol coolant at the output of the radiator, is necessary to further reduce vehicle costs and weight. The activity documented in this report includes development and testing of high temperature components, activities in support of high temperature testing, an assessment of several component packaging methods, and how elevated operating temperatures would impact their reliability. This report is organized with testing of new high temperature capacitors in Section 2 and testing of new 150 C junction temperature trench insulated gate bipolar transistor (IGBTs) in Section 3. Section 4 addresses some operational OPAL-GT information, which was necessary for developing module level tests. Section 5 summarizes calibration of equipment needed for the high temperature testing. Section 6 details some additional work that was funded on silicon carbide (SiC) device testing for high temperature use, and Section 7 is the complete text of a report funded from this effort summarizing packaging methods and their reliability issues for use in high temperature power electronics. Components were tested to evaluate the performance characteristics of the component at different operating temperatures. The temperature of the component is determined by the ambient temperature (i.e., temperature surrounding the device) plus the

  18. Development of Designer Diamond Technology for High Pressure High Temperature Experiments in Support of Stockpile Stewardship Program

    SciTech Connect (OSTI)

    Vohra, Yogesh, K.

    2009-10-28

    The role of nitrogen in the fabrication of designer diamond was systematically investigated by adding controlled amount of nitrogen in hydrogen/methane/oxygen plasma. This has led to a successful recipe for reproducible fabrication of designer diamond anvils for high-pressure high-temperature research in support of stockpile stewardship program. In the three-year support period, several designer diamonds fabricated with this new growth chemistry were utilized in high-pressure experiments at UAB and Lawrence Livermore National Laboratory. The designer diamond anvils were utilized in high-pressure studies on heavy rare earth metals, high pressure melting studies on metals, and electrical resistance measurements on iron-based layered superconductors under high pressures. The growth chemistry developed under NNSA support can be adapted for commercial production of designer diamonds.

  19. Spin Hall magnetoresistance at high temperatures

    SciTech Connect (OSTI)

    Uchida, Ken-ichi; Qiu, Zhiyong; Kikkawa, Takashi; Iguchi, Ryo; Saitoh, Eiji

    2015-02-02

    The temperature dependence of spin Hall magnetoresistance (SMR) in Pt/Y{sub 3}Fe{sub 5}O{sub 12} (YIG) bilayer films has been investigated in a high temperature range from room temperature to near the Curie temperature of YIG. The experimental results show that the magnitude of the magnetoresistance ratio induced by the SMR monotonically decreases with increasing the temperature and almost disappears near the Curie temperature. We found that, near the Curie temperature, the temperature dependence of the SMR in the Pt/YIG film is steeper than that of a magnetization curve of the YIG; the critical exponent of the magnetoresistance ratio is estimated to be 0.9. This critical behavior of the SMR is attributed mainly to the temperature dependence of the spin-mixing conductance at the Pt/YIG interface.

  20. Method and composition for improving flux pinning and critical current in superconductors

    DOE Patents [OSTI]

    Morris, Donald E.

    1995-01-01

    Superconducting materials and methods of forming superconducting materials are disclosed. Highly oxidized superconductors are heated at a relatively high temperature so as to release oxygen, which migrates out of the material, and form a non-superconducting phase which does not diffuse out of grains of the material. The material is then reoxidized at a lower temperature, leaving the non-superconducting inclusions inside a superconducting phase. The non-superconducting inclusions act as pinning centers in the superconductor, increasing the critical current thereof.

  1. Method and composition for improving flux pinning and critical current in superconductors

    DOE Patents [OSTI]

    Morris, D.E.

    1995-07-04

    Superconducting materials and methods of forming superconducting materials are disclosed. Highly oxidized superconductors are heated at a relatively high temperature so as to release oxygen, which migrates out of the material, and form a non-superconducting phase which does not diffuse out of grains of the material. The material is then reoxidized at a lower temperature, leaving the non-superconducting inclusions inside a superconducting phase. The non-superconducting inclusions act as pinning centers in the superconductor, increasing the critical current thereof. 14 figs.

  2. High Temperature Downhole Motor - Energy Innovation Portal

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

    Geothermal Geothermal Find More Like This Return to Search High Temperature Downhole Motor Sandia National Laboratories Contact SNL About This Technology Publications: PDF Document Publication Market Sheet (164 KB) Technology Marketing Summary Drilling costs amount to over half of the total cost of geothermal energy production. To address the high cost of well construction, Sandia engineers are developing a high temperature downhole motor that provides a high-power downhole rotation solution for

  3. High temperature solar selective coatings

    DOE Patents [OSTI]

    Kennedy, Cheryl E

    2014-11-25

    Improved solar collectors (40) comprising glass tubing (42) attached to bellows (44) by airtight seals (56) enclose solar absorber tubes (50) inside an annular evacuated space (54. The exterior surfaces of the solar absorber tubes (50) are coated with improved solar selective coatings {48} which provide higher absorbance, lower emittance and resistance to atmospheric oxidation at elevated temperatures. The coatings are multilayered structures comprising solar absorbent layers (26) applied to the meta surface of the absorber tubes (50), typically stainless steel, topped with antireflective Savers (28) comprising at least two layers 30, 32) of refractory metal or metalloid oxides (such as titania and silica) with substantially differing indices of refraction in adjacent layers. Optionally, at least one layer of a noble metal such as platinum can be included between some of the layers. The absorbent layers cars include cermet materials comprising particles of metal compounds is a matrix, which can contain oxides of refractory metals or metalloids such as silicon. Reflective layers within the coating layers can comprise refractory metal silicides and related compounds characterized by the formulas TiSi. Ti.sub.3SiC.sub.2, TiAlSi, TiAN and similar compounds for Zr and Hf. The titania can be characterized by the formulas TiO.sub.2, Ti.sub.3O.sub.5. TiOx or TiO.sub.xN.sub.1-x with x 0 to 1. The silica can be at least one of SiO.sub.2, SiO.sub.2x or SiO.sub.2xN.sub.1-x with x=0 to 1.

  4. High-temperature Pump Monitoring - High-temperature ESP Monitoring; 2010

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

    Geothermal Technology Program Peer Review Report | Department of Energy temperature Pump Monitoring - High-temperature ESP Monitoring; 2010 Geothermal Technology Program Peer Review Report High-temperature Pump Monitoring - High-temperature ESP Monitoring; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review hightemp_018_dhruva.pdf (188.95 KB) More Documents & Publications Development of Tools for Measuring Temperature, Flow,

  5. Electrical connection structure for a superconductor element

    DOE Patents [OSTI]

    Lallouet, Nicolas; Maguire, James

    2010-05-04

    The invention relates to an electrical connection structure for a superconductor element cooled by a cryogenic fluid and connected to an electrical bushing, which bushing passes successively through an enclosure at an intermediate temperature between ambient temperature and the temperature of the cryogenic fluid, and an enclosure at ambient temperature, said bushing projecting outside the ambient temperature enclosure. According to the invention, said intermediate enclosure is filled at least in part with a solid material of low thermal conductivity, such as a polyurethane foam or a cellular glass foam. The invention is applicable to connecting a superconductor cable at cryogenic temperature to a device for equipment at ambient temperature.

  6. Development of a 100-Watt High Temperature Thermoelectric Generator...

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

    a 100-Watt High Temperature Thermoelectric Generator Development of a 100-Watt High Temperature Thermoelectric Generator Test results for low and high temperature thermoelectric ...

  7. Sandia_HighTemperatureComponentEvaluation_2015.

    SciTech Connect (OSTI)

    Cashion, Avery T.

    2015-03-01

    The objective of this project is to perform independent evaluation of high temperature components to determine their suitability for use in high temperature geothermal tools. Development of high temperature components has been increasing rapidly due to demand from the high temperature oil and gas exploration and aerospace industries. Many of these new components are at the late prototype or first production stage of development and could benefit from third party evaluation of functionality and lifetime at elevated temperatures. In addition to independent testing of new components, this project recognizes that there is a paucity of commercial-off-the-shelf COTS components rated for geothermal temperatures. As such, high-temperature circuit designers often must dedicate considerable time and resources to determine if a component exists that they may be able to knead performance out of to meet their requirements. This project aids tool developers by characterization of select COTS component performances beyond published temperature specifications. The process for selecting components includes public announcements of project intent (e.g., FedBizOps), direct discussions with candidate manufacturers,and coordination with other DOE funded programs.

  8. Symposium on high temperature and materials chemistry

    SciTech Connect (OSTI)

    Not Available

    1989-10-01

    This volume contains the written proceedings of the Symposium on High Temperature and Materials Chemistry held in Berkeley, California on October 24--25, 1989. The Symposium was sponsored by the Materials and Chemical Sciences Division of Lawrence Berkeley Laboratory and by the College of Chemistry of the University of California at Berkeley to discuss directions, trends, and accomplishments in the field of high temperature and materials chemistry. Its purpose was to provide a snapshot of high temperature and materials chemistry and, in so doing, to define status and directions.

  9. High temperature solid state storage cell

    DOE Patents [OSTI]

    Rea, Jesse R.; Kallianidis, Milton; Kelsey, G. Stephen

    1983-01-01

    A completely solid state high temperature storage cell comprised of a solid rechargeable cathode such as TiS.sub.2, a solid electrolyte which remains solid at the high temperature operating conditions of the cell and which exhibits high ionic conductivity at such elevated temperatures such as an electrolyte comprised of lithium iodide, and a solid lithium or other alkali metal alloy anode (such as a lithium-silicon alloy) with 5-50% by weight of said anode being comprised of said solid electrolyte.

  10. Superconductor cable

    DOE Patents [OSTI]

    Allais, Arnaud; Schmidt, Frank (Langenhagen, DE

    2009-12-15

    A superconductor cable includes a superconductive cable core (1) and a cryostat (2) enclosing the same. The cable core (1) has a superconductive conductor (3), an insulation (4) surrounding the same and a shielding (5) surrounding the insulation (4). A layer (3b) of a dielectric or semiconducting material is applied to a central element (3a) formed from a normally conducting material as a strand or tube and a layer (3c) of at least one wire or strip of superconductive material is placed helically on top. The central element (3a) and the layer (3c) are connected to each other in an electrically conducting manner at the ends of the cable core (1).

  11. High temperature thermometric phosphors for use in a temperature sensor

    DOE Patents [OSTI]

    Allison, Stephen W.; Cates, Michael R.; Boatner, Lynn A.; Gillies, George T.

    1998-01-01

    A high temperature phosphor consists essentially of a material having the general formula LuPO.sub.4 :Dy.sub.(x),Eu.sub.(y), wherein: 0.1 wt %.ltoreq.x.ltoreq.20 wt % and 0.1 wt %.ltoreq.y.ltoreq.20 wt %. The high temperature phosphor is in contact with an article whose temperature is to be determined. The article having the phosphor in contact with it is placed in the environment for which the temperature of the article is to be determined. The phosphor is excited by a laser causing the phosphor to fluoresce. The emission from the phosphor is optically focused into a beam-splitting mirror which separates the emission into two separate emissions, the emission caused by the dysprosium dopant and the emission caused by the europium dopent. The separated emissions are optically filtered and the intensities of the emission are detected and measured. The ratio of the intensity of each emission is determined and the temperature of the article is calculated from the ratio of the intensities of the separate emissions.

  12. High temperature thermometric phosphors for use in a temperature sensor

    DOE Patents [OSTI]

    Allison, S.W.; Cates, M.R.; Boatner, L.A.; Gillies, G.T.

    1998-03-24

    A high temperature phosphor consists essentially of a material having the general formula LuPO{sub 4}:Dy{sub (x)},Eu{sub (y)}, wherein: 0.1 wt %{<=}x{<=}20 wt % and 0.1 wt %{<=}y{<=}20 wt %. The high temperature phosphor is in contact with an article whose temperature is to be determined. The article having the phosphor in contact with it is placed in the environment for which the temperature of the article is to be determined. The phosphor is excited by a laser causing the phosphor to fluoresce. The emission from the phosphor is optically focused into a beam-splitting mirror which separates the emission into two separate emissions, the emission caused by the dysprosium dopant and the emission caused by the europium dopant. The separated emissions are optically filtered and the intensities of the emission are detected and measured. The ratio of the intensity of each emission is determined and the temperature of the article is calculated from the ratio of the intensities of the separate emissions. 2 figs.

  13. High-Temperature-High-Volume Lifting For Enhanced Geothermal...

    Open Energy Info (EERE)

    include high-temperature drive system materials, journal and thrust bearings, and corrosion and erosion-resistant lifting pump components. Finally, in Phase 3, the overall...

  14. High temperature ceramic/metal joint structure

    DOE Patents [OSTI]

    Boyd, Gary L.

    1991-01-01

    A high temperature turbine engine includes a hybrid ceramic/metallic rotor member having ceramic/metal joint structure. The disclosed joint is able to endure higher temperatures than previously possible, and aids in controlling heat transfer in the rotor member.

  15. High temperature hot water systems: A primer

    SciTech Connect (OSTI)

    Govan, F.A.

    1998-01-01

    The fundamental principles of high temperature water (HTW) system technology and its advantages for thermal energy distribution are presented. Misconceptions of this technology are also addressed. The paper describes design principles, applications, HTW properties, HTW system advantages, selecting the engineer, load diversification, design temperatures, system pressurization, pump considerations, constant vs. VS pumps, HTW generator types, and burners and controls.

  16. High-temperature superconductivity: A conventional conundrum

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Božović, Ivan

    2016-01-07

    High-temperature superconductivity in ultrathin films of iron selenide deposited on strontium titanate has been attributed to various exotic mechanisms, and new experiments indicate that it may be conventional, with broader implications.

  17. Polyelectrolyte Materials for High Temperature Fuel Cells

    Office of Energy Efficiency and Renewable Energy (EERE)

    This presentation, which focuses on polyelectrolyte materials for high temperature fuel cells, was given by John Kerr of Lawrence Berkeley National Laboratory at a meeting on new fuel cell projects in February 2007.

  18. High Temperature Interfacial Superconductivity - Energy Innovation Portal

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

    High Temperature Interfacial Superconductivity Brookhaven National Laboratory Contact BNL About This Technology Publications: PDF Document Publication High-temperature interface superconductivity between metallic and insulating copper oxides (791 KB) <p> (a) Annular dark field image of the structure showing extended defects in the metal layer (marked by white arrows). The black arrow shows the metal-insulator interface (b) A magnified image of one defect which nucleated at the

  19. Apparatus and method for high temperature viscosity and temperature measurements

    DOE Patents [OSTI]

    Balasubramaniam, Krishnan; Shah, Vimal; Costley, R. Daniel; Singh, Jagdish P.

    2001-01-01

    A probe for measuring the viscosity and/or temperature of high temperature liquids, such as molten metals, glass and similar materials comprises a rod which is an acoustical waveguide through which a transducer emits an ultrasonic signal through one end of the probe, and which is reflected from (a) a notch or slit or an interface between two materials of the probe and (b) from the other end of the probe which is in contact with the hot liquid or hot melt, and is detected by the same transducer at the signal emission end. To avoid the harmful effects of introducing a thermally conductive heat sink into the melt, the probe is made of relatively thermally insulative (non-heat-conductive) refractory material. The time between signal emission and reflection, and the amplitude of reflections, are compared against calibration curves to obtain temperature and viscosity values.

  20. Magnetism and Superconductivity Compete in Iron-based Superconductors |

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

    Stanford Synchrotron Radiation Lightsource Magnetism and Superconductivity Compete in Iron-based Superconductors Wednesday, April 30, 2014 HTSC Figure 1 Fig. 1. Measured electronic structure of underdoped Ba1-xKxFe2As2 in the orthorhombic spin-density-wave (SDW) ordered state. The antiferromagnetic and ferromagnetic directions are indicated by arrows. High-temperature superconductivity (HTSC), one of the long-standing unsolved mysteries of condensed matter physics, is a beautiful example of

  1. High transition-temperature SQUID magnetometers and practical applications

    SciTech Connect (OSTI)

    Dantsker, E

    1997-05-01

    The design, fabrication and performance of SQUID magnetometers based on thin films of the high-transition temperature superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} (YBCO) are described. Essential to the achieving high magnetic field resolution at low frequencies is the elimination of 1/f flux noise due to thermally activated hopping of flux vortices between pinning sites in the superconducting films. Through improvements in processing, 1/f noise in single layer YBCO thin films and YBCO-SrTiO{sub 3}-YBCO trilayers was systematically reduced to allow fabrication of sensitive SQUID magnetometers. Both single-layer directly coupled SQUID magnetometers and multilayer magnetometers were fabricated, based on the dc SQUID with bicrystal grain boundary Josephson junctions. Multilayer magnetometers had a lower magnetic field noise for a given physical size due to greater effective sensing areas. A magnetometer consisting of a SQUID inductively coupled to the multiturn input coil of a flux transformer in a flip-chip arrangement had a field noise of 27 fT Hz{sup {minus}1/2} at 1 Hz and 8.5 fT Hz{sup {minus}1/2} at 1 kHz. A multiloop multilayer SQUID magnetometer had a field noise of 37 fT Hz{sup {minus}1/2} at 1 Hz and 18 fT Hz{sup {minus}1/2} at 1 kHz. A three-axis SQUID magnetometer for geophysical applications was constructed and operated in the field in the presence of 60 Hz and radiofrequency noise. Clinical quality magnetocardiograms were measured using multilayer SQUID magnetometers in a magnetically shielded room.

  2. The creation of high-temperature superconducting cables of megawatt range in Russia

    SciTech Connect (OSTI)

    Sytnikov, V. E. Bemert, S. E.; Krivetsky, I. V.; Romashov, M. A.; Popov, D. A.; Fedotov, E. V.; Komandenko, O. V.

    2015-12-15

    Urgent problems of the power industry in the 21st century require the creation of smart energy systems, providing a high effectiveness of generation, transmission, and consumption of electric power. Simultaneously, the requirements for controllability of power systems and ecological and resource-saving characteristics at all stages of production and distribution of electric power are increased. One of the decision methods of many problems of the power industry is the development of new high-efficiency electrical equipment for smart power systems based on superconducting technologies to ensure a qualitatively new level of functioning of the electric power industry. The intensive research and development of new types of electrical devices based on superconductors are being carried out in many industrialized advanced countries. Interest in such developments has especially increased in recent years owing to the discovery of so-called high-temperature superconductors (HTS) that do not require complicated and expensive cooling devices. Such devices can operate at cooling by inexpensive and easily accessible liquid nitrogen. Taking into account the obvious advantages of superconducting cable lines for the transmission of large power flows through an electrical network, as compared with conventional cables, the Federal Grid Company of Unified Energy System (JSC FGC UES) initiated a research and development program including the creation of superconducting HTS AC and DC cable lines. Two cable lines for the transmitted power of 50 MVA/MW at 20 kV were manufactured and tested within the framework of the program.

  3. Effect of fractons in strongly coupled superconductors

    SciTech Connect (OSTI)

    Tewari, S.P.; Gumber, P.K. )

    1990-02-01

    The effect of fractons on strongly coupled superconductors has been studied using both McMillan's equation and Kresin's equation which is valid for any arbitrary value of {lambda}. Contrary to common belief it is found that there is no significant increase in {ital T}{sub {ital c}} when the crystal lattice is changed into a fractal lattice. However, under certain conditions there may be a substantial increase in the critical temperature in the fractal superconductor over its value in the corresponding crystalline superconductor.

  4. Reactive nanophase oxide additions to melt-processed high-{Tc} superconductors

    SciTech Connect (OSTI)

    Goretta, K.C.; Brandel, B.P.; Lanagan, M.T.; Hu, J.; Miller, D.J.; Sengupta, S.; Parker, J.C.; Ali, M.N.; Chen, Nan

    1994-10-01

    Nanophase TiO{sub 2} and Al{sub 2}O{sub 3} powders were synthesized by a vapor-phase process and mechanically mixed with stoichiometric YBa{sub 2}Cu{sub 3}O{sub x} and TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} powders in 20 mole % concentrations. Pellets produced from powders with and without nanophase oxides were heated in air or O{sub 2} above the peritectic melt temperature and slow-cooled. At 4.2 K, the intragranular critical current density (J{sub c}) increased dramatically with the oxide additions. At 35--50 K, effects of the oxide additions were positive, but less pronounced. At 77 K, the additions decreased J{sub c}, probably because of inducing a depresion of the transition temperature.

  5. Development of a 500 Watt High Temperature Thermoelectric Generator...

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

    a 500 Watt High Temperature Thermoelectric Generator Development of a 500 Watt High Temperature Thermoelectric Generator A low temperature TEG has been built and tested providing ...

  6. Vehicle Technologies Office Merit Review 2015: High Temperature...

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

    High Temperature Materials for High Efficiency Engines Vehicle Technologies Office Merit Review 2015: High Temperature Materials for High Efficiency Engines Presentation given by ...

  7. Theoretical investigation of the heavy-fermion superconductors in itinerant ferromagnets

    SciTech Connect (OSTI)

    Feng Shi-ping

    1987-04-01

    We have discussed the superconductivity in itinerant ferromagnets for P-wave superconductors. Results show that a ferromagnetic superconductor can be formed for some special parameters at some temperatures.

  8. High-Pressure Single-Crystal Neutron Scattering Study of Magnetic and Fe Vacancy Orders in (Tl,Rb)2 Fe4 Se5 Superconductor

    SciTech Connect (OSTI)

    Ye, Feng; Bao, Wei; Chi, Song-Xue; Santos, Antonio M. dos; Molaison, Jamie J.; Fang, Ming-Hu; Wang, Hang-Dong; Mao, Qian-Hui; Wang, Jin-Chen; Liu, Juan-Juan; Sheng, Jie-Ming

    2014-12-01

    We investigate the magnetic and iron vacancy orders in superconducting (Tl,Rb)2Fe4Se5 single-crystals by using a high-pressure neutron diffraction technique. Similar to the temperature effect, the block antiferromagnetic order gradually decreases upon increasing pressure while the Fe vacancy superstructural order remains intact before its precipitous disappearance at the critical pressure Pc = 8.3 GPa. Combined with previously determined Pc for superconductivity, our phase diagram under pressure reveals the concurrence of the block AFM order, the √5 × √5 iron vacancy order and superconductivity for the 245 superconductor. Lastly, a synthesis of current experimental data in a coherent physical picture is attempted.

  9. Method of producing highly oxidized superconductors containing barium, copper, and a third metal

    DOE Patents [OSTI]

    Morris, D.E.

    1996-02-20

    Novel superconducting materials in the form of compounds, structures or phases are formed by performing otherwise known syntheses in a highly oxidizing atmosphere rather than that created by molecular oxygen at atmospheric pressure or below. This leads to the successful synthesis of novel superconducting compounds which are thermodynamically stable at the conditions under which they are formed. 16 figs.

  10. Method of producing highly oxidized superconductors containing barium, copper, and a third metal

    DOE Patents [OSTI]

    Morris, Donald E.

    1996-01-01

    Novel superconducting materials in the form of compounds, structures or phases are formed by performing otherwise known syntheses in a highly oxidizing atmosphere rather than that created by molecular oxygen at atmospheric pressure or below. This leads to the successful synthesis of novel superconducting compounds which are thermodynamically stable at the conditions under which they are formed.

  11. Method for improving performance of high temperature superconductors within a magnetic field

    DOE Patents [OSTI]

    Wang, Haiyan; Foltyn, Stephen R.; Maiorov, Boris A.; Civale, Leonardo

    2010-01-05

    The present invention provides articles including a base substrate including a layer of an oriented cubic oxide material having a rock-salt-like structure layer thereon; and, a buffer layer upon the oriented cubic oxide material having a rock-salt-like structure layer, the buffer layer having an outwardly facing surface with a surface morphology including particulate outgrowths of from 10 nm to 500 run in size at the surface, such particulate outgrowths serving as flux pinning centers whereby the article maintains higher performance within magnetic fields than similar articles without the necessary density of such outgrowths.

  12. A theoretical analysis of the effect of uniaxial elastic strain on the critical temperature of cuprate superconductors

    SciTech Connect (OSTI)

    Welch, D.O.; Baetzold, R.C.

    1992-12-31

    Factors which influence the effect of uniaxial stress and strain on the superconducting critical temperature are discussed, with emphasis on the effect of uniaxial strain on the mobile hole density of YBa{sub 2}Ci{sub 3}O{sub 7}.

  13. High Temperature/Low Humidity Polymer Electrolytes Derived from...

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

    High TemperatureLow Humidity Polymer Electrolytes Derived from Ionic Liquids High TemperatureLow Humidity Polymer Electrolytes Derived from Ionic Liquids Presentation on High ...

  14. High Temperature Materials Interim Data Qualification Report

    SciTech Connect (OSTI)

    Nancy Lybeck

    2010-08-01

    ABSTRACT Projects for the very high temperature reactor (VHTR) Technology Development Office provide data in support of Nuclear Regulatory Commission licensing of the VHTR. Fuel and materials to be used in the reactor are tested and characterized to quantify performance in high temperature and high fluence environments. The VHTR program has established the NGNP Data Management and Analysis System (NDMAS) to ensure that VHTR data are qualified for use, stored in a readily accessible electronic form, and analyzed to extract useful results. This document focuses on the first NDMAS objective. It describes the High Temperature Materials characterization data stream, the processing of these data within NDMAS, and reports the interim FY2010 qualification status of the data. Data qualification activities within NDMAS for specific types of data are determined by the data qualification category assigned by the data generator. The High Temperature Materials data are being collected under NQA-1 guidelines, and will be qualified data. For NQA-1 qualified data, the qualification activities include: (1) capture testing, to confirm that the data stored within NDMAS are identical to the raw data supplied, (2) accuracy testing to confirm that the data are an accurate representation of the system or object being measured, and (3) documenting that the data were collected under an NQA-1 or equivalent Quality Assurance program. Currently, data from two test series within the High Temperature Materials data stream have been entered into the NDMAS vault: 1. Tensile Tests for Sm (i.e., Allowable Stress) Confirmatory Testing 1,403,994 records have been inserted into the NDMAS database. Capture testing is in process. 2. Creep-Fatigue Testing to Support Determination of Creep-Fatigue Interaction Diagram 918,854 records have been processed and inserted into the NDMAS database. Capture testing is in process.

  15. Development of manufacturing capability for the fabrication of the Nb/sub 3/Sn superconductor for the High Field Test Facility. Final report

    SciTech Connect (OSTI)

    Spencer, C R

    1981-01-01

    Construction of High Field Test Facility (HFTF) at Lawrence Livermore Laboratory (LLNL) requires an extended surface Nb/sub 3/Sn superconductor cable of carrying currents in excess of 7500 amperes in a 12 Tesla magnetic field. This conductor consists of a 5.4 mm x 11.0 mm superconducting core onto whose broad surfaces are soldered embossed oxygen free copper strips. Two different core designs have been developed and the feasibility of each design evaluated. Equipment necessary to produce the conductor were developed and techniques of production were explored.

  16. Life assessment of high temperature headers

    SciTech Connect (OSTI)

    Nakoneczny, G.J.; Schultz, C.C.

    1995-08-01

    High temperature superheater and reheater headers have been a necessary focus of any boiler life extension project done by the electric utilities. These headers operate at high temperatures in excess of 900 F and are subject to thermal stresses and pressure stresses that can lead to cracking and failure. Babcock and Wilcox Company`s investigation of these problems began in 1982 focusing on P11 materials (1{1/4}Cr-{1/2}Mo). Early assessment was limited to dimensional analysis methods which were aimed at quantifying swell due to creep. Condition assessment and remaining useful life analysis methods have evolved since these initial studies. Experience coupled with improved inspection methods and analytical techniques has advanced the life assessment of these high temperature headers. In the discussion that follows the authors provide an overview of B and W`s approach to header life assessment including the location and causes for header failures, inspection techniques and analysis methods which are all directed at determining the remaining useful life of these high temperature headers.

  17. High temperature intermetallic binders for HVOF carbides

    SciTech Connect (OSTI)

    Shaw, K.G.; Gruninger, M.F.; Jarosinski, W.J.

    1994-12-31

    Gas turbines technology has a long history of employing the desirable high temperature physical attributes of ceramic-metallic (cermet) materials. The most commonly used coatings incorporate combinations of WC-Co and Cr{sub 3}C{sub 2}-NiCr, which have also been successfully utilized in other non-turbine coating applications. Increased turbine operating temperatures and other high temperature service conditions have made apparent the attractive notion of increasing the temperature capability and corrosion resistance of these coatings. In this study the intermetallic binder NiAl has been used to replace the cobalt and NiCr constituents of conventional WC and Cr{sub 3}C{sub 2} cermet powders. The composite carbide thermal spray powders were fabricated for use in the HVOF coating process. The structure of HVOF deposited NiAl-carbide coatings are compared directly to the more familiar WC-Co and Cr{sub 3}C{sub 2}-NiCr coatings using X-ray diffraction, back-scattered electron imaging (BEI) and electron dispersive spectroscopy (EDS). Hardness variations with temperature are reported and compared between the NiAl and Co/NiCr binders.

  18. High temperature annealing of ion irradiated tungsten

    SciTech Connect (OSTI)

    Ferroni, Francesco; Yi, Xiaoou; Fitzgerald, Steven P.; Edmondson, Philip D.; Roberts, Steve G.

    2015-03-21

    In this study, transmission electron microscopy of high temperature annealing of pure tungsten irradiated by self-ions was conducted to elucidate microstructural and defect evolution in temperature ranges relevant to fusion reactor applications (500–1200°C). Bulk isochronal and isothermal annealing of ion irradiated pure tungsten (2 MeV W+ ions, 500°C, 1014 W+/cm2) with temperatures of 800, 950, 1100 and 1400°C, from 0.5 to 8 h, was followed by ex situ characterization of defect size, number density, Burgers vector and nature. Loops with diameters larger than 2–3 nm were considered for detailed analysis, among which all loops had View the MathML source and were predominantly of interstitial nature. In situ annealing experiments from 300 up to 1200°C were also carried out, including dynamic temperature ramp-ups. These confirmed an acceleration of loop loss above 900°C. At different temperatures within this range, dislocations exhibited behaviour such as initial isolated loop hopping followed by large-scale rearrangements into loop chains, coalescence and finally line–loop interactions and widespread absorption by free-surfaces at increasing temperatures. An activation energy for the annealing of dislocation length was obtained, finding Ea=1.34±0.2 eV for the 700–1100°C range.

  19. High temperature annealing of ion irradiated tungsten

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ferroni, Francesco; Yi, Xiaoou; Arakawa, Kazuto; Fitzgerald, Steven P.; Edmondson, Philip D.; Roberts, Steve G.

    2015-03-21

    In this study, transmission electron microscopy of high temperature annealing of pure tungsten irradiated by self-ions was conducted to elucidate microstructural and defect evolution in temperature ranges relevant to fusion reactor applications (500–1200°C). Bulk isochronal and isothermal annealing of ion irradiated pure tungsten (2 MeV W+ ions, 500°C, 1014 W+/cm2) with temperatures of 800, 950, 1100 and 1400°C, from 0.5 to 8 h, was followed by ex situ characterization of defect size, number density, Burgers vector and nature. Loops with diameters larger than 2–3 nm were considered for detailed analysis, among which all loops had View the MathML source andmore » were predominantly of interstitial nature. In situ annealing experiments from 300 up to 1200°C were also carried out, including dynamic temperature ramp-ups. These confirmed an acceleration of loop loss above 900°C. At different temperatures within this range, dislocations exhibited behaviour such as initial isolated loop hopping followed by large-scale rearrangements into loop chains, coalescence and finally line–loop interactions and widespread absorption by free-surfaces at increasing temperatures. An activation energy for the annealing of dislocation length was obtained, finding Ea=1.34±0.2 eV for the 700–1100°C range.« less

  20. Influence of superconductor film composition on adhesion strength of coated conductors

    SciTech Connect (OSTI)

    Kesgin, Ibrahim; Khatri, Narayan; Liu, Yuhao; Delgado, Louis; Galstyan, Eduard; Selvamanickam, Venkat

    2015-11-20

    The effect of high temperature superconductor (HTS) film composition on the adhesion strength of rare- earth barium copper oxide coated conductors (CCs) has been studied. It has been found that the mechanical integrity of the superconductor layer is very susceptible to the defects especially those along the ab plane, probably due to the weak interfaces between the defects and the matrix. Gd and Y in the standard composition were substituted with Sm and the number of in-plane defects was drastically reduced. Consequently, a four-fold increase in adhesion or peeling strength in Sm-based CCs was achieved compared to the standard GdYBCO samples.

  1. Method of fabricating a (1223) Tl-Ba-Ca-Cu-O superconductor

    DOE Patents [OSTI]

    Tkaczyk, J.E.; Lay, K.W.; He, Q.

    1997-07-08

    A method is disclosed for fabricating a polycrystalline <223> thallium-containing superconductor having high critical current at elevated temperatures and in the presence of a magnetic field. A powder precursor containing compounds other than thallium is compressed on a substrate. Thallium is incorporated in the densified powder precursor at a high temperature in the presence of a partial pressure of a thallium-containing vapor. 2 figs.

  2. Method of fabricating a (1223) Tl-Ba-Ca-Cu-O superconductor

    DOE Patents [OSTI]

    Tkaczyk, John Eric; Lay, Kenneth Wilbur; He, Qing

    1997-01-01

    A method is disclosed for fabricating a polycrystalline <223> thallium-containing superconductor having high critical current at elevated temperatures and in the presence of a magnetic field. A powder precursor containing compounds other than thallium is compressed on a substrate. Thallium is incorporated in the densified powder precursor at a high temperature in the presence of a partial pressure of a thallium-containing vapor.

  3. High-Temperature Behavior of Cellulose I

    SciTech Connect (OSTI)

    Matthews, James F.; Bergenstråhle, Malin; Beckham, Gregg T.; Himmel, Michael E.; Nimlos, Mark R.; Brady, John W.; Crowley, Michael F.

    2011-03-17

    We use molecular simulation to elucidate the structural behavior of small hydrated cellulose Iβ microfibrils heated to 227 °C (500 K) with two carbohydrate force fields. In contrast to the characteristic two-dimensional hydrogen-bonded layer sheets present in the cellulose Iβ crystal structure, we show that at high temperature a three-dimensional hydrogen bond network forms, made possible by hydroxymethyl groups changing conformation from trans–gauche (TG) to gauche–gauche (GG) in every second layer corresponding to “center” chains in cellulose Iβ and from TG to gauche–trans (GT) in the “origin” layer. The presence of a regular three-dimensional hydrogen bond network between neighboring sheets eliminates the possibility of twist, whereas two-dimensional hydrogen bonding allows for microfibril twist to occur. Structural features of this high-temperature phase as determined by molecular simulation may explain several experimental observations for which no detailed structural basis has been offered. This includes an explanation for the observed temperature and crystal size dependence for the extent of hydrogen/deuterium exchange, and diffraction patterns of cellulose at high temperature.

  4. High Temperature Fluoride Salt Test Loop

    SciTech Connect (OSTI)

    Aaron, Adam M.; Cunningham, Richard Burns; Fugate, David L.; Holcomb, David Eugene; Kisner, Roger A.; Peretz, Fred J.; Robb, Kevin R.; Wilson, Dane F.; Yoder, Jr, Graydon L.

    2015-12-01

    Effective high-temperature thermal energy exchange and delivery at temperatures over 600°C has the potential of significant impact by reducing both the capital and operating cost of energy conversion and transport systems. It is one of the key technologies necessary for efficient hydrogen production and could potentially enhance efficiencies of high-temperature solar systems. Today, there are no standard commercially available high-performance heat transfer fluids above 600°C. High pressures associated with water and gaseous coolants (such as helium) at elevated temperatures impose limiting design conditions for the materials in most energy systems. Liquid salts offer high-temperature capabilities at low vapor pressures, good heat transport properties, and reasonable costs and are therefore leading candidate fluids for next-generation energy production. Liquid-fluoride-salt-cooled, graphite-moderated reactors, referred to as Fluoride Salt Reactors (FHRs), are specifically designed to exploit the excellent heat transfer properties of liquid fluoride salts while maximizing their thermal efficiency and minimizing cost. The FHR s outstanding heat transfer properties, combined with its fully passive safety, make this reactor the most technologically desirable nuclear power reactor class for next-generation energy production. Multiple FHR designs are presently being considered. These range from the Pebble Bed Advanced High Temperature Reactor (PB-AHTR) [1] design originally developed by UC-Berkeley to the Small Advanced High-Temperature Reactor (SmAHTR) and the large scale FHR both being developed at ORNL [2]. The value of high-temperature, molten-salt-cooled reactors is also recognized internationally, and Czechoslovakia, France, India, and China all have salt-cooled reactor development under way. The liquid salt experiment presently being developed uses the PB-AHTR as its focus. One core design of the PB-AHTR features multiple 20 cm diameter, 3.2 m long fuel channels

  5. Gasification of high ash, high ash fusion temperature bituminous coals

    DOE Patents [OSTI]

    Liu, Guohai; Vimalchand, Pannalal; Peng, WanWang

    2015-11-13

    This invention relates to gasification of high ash bituminous coals that have high ash fusion temperatures. The ash content can be in 15 to 45 weight percent range and ash fusion temperatures can be in 1150.degree. C. to 1500.degree. C. range as well as in excess of 1500.degree. C. In a preferred embodiment, such coals are dealt with a two stage gasification process--a relatively low temperature primary gasification step in a circulating fluidized bed transport gasifier followed by a high temperature partial oxidation step of residual char carbon and small quantities of tar. The system to process such coals further includes an internally circulating fluidized bed to effectively cool the high temperature syngas with the aid of an inert media and without the syngas contacting the heat transfer surfaces. A cyclone downstream of the syngas cooler, operating at relatively low temperatures, effectively reduces loading to a dust filtration unit. Nearly dust- and tar-free syngas for chemicals production or power generation and with over 90%, and preferably over about 98%, overall carbon conversion can be achieved with the preferred process, apparatus and methods outlined in this invention.

  6. Compliant high temperature seals for dissimilar materials

    DOE Patents [OSTI]

    Rynders, Steven Walton; Minford, Eric; Tressler, Richard Ernest; Taylor, Dale M.

    2001-01-01

    A high temperature, gas-tight seal is formed by utilizing one or more compliant metallic toroidal ring sealing elements, where the applied pressure serves to activate the seal, thus improving the quality of the seal. The compliant nature of the sealing element compensates for differences in thermal expansion between the materials to be sealed, and is particularly useful in sealing a metallic member and a ceramic tube art elevated temperatures. The performance of the seal may be improved by coating the sealing element with a soft or flowable coating such as silver or gold and/or by backing the sealing element with a bed of fine powder. The material of the sealing element is chosen such that the element responds to stress elastically, even at elevated temperatures, permitting the seal to operate through multiple thermal cycles.

  7. Thermal fuse for high-temperature batteries

    DOE Patents [OSTI]

    Jungst, Rudolph G.; Armijo, James R.; Frear, Darrel R.

    2000-01-01

    A thermal fuse, preferably for a high-temperature battery, comprising leads and a body therebetween having a melting point between approximately 400.degree. C. and 500.degree. C. The body is preferably an alloy of Ag--Mg, Ag--Sb, Al--Ge, Au--In, Bi--Te, Cd--Sb, Cu--Mg, In--Sb, Mg--Pb, Pb--Pd, Sb--Zn, Sn--Te, or Mg--Al.

  8. High Temperature Materials Laboratory (HTML) - PSD Directorate

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

    filler A National Resource for Collaborative Materials Research The High Temperature Materials Laboratory (HTML) User Program is on hiatus due to federal budget reductions. However, research projects at the HTML still may be conducted on a cost-recovery basis through the Work for Others (WFO) Program or under a Cooperative R&D Agreement (CRADA). Dr. Edgar Lara-Curzio, HTML Director Tel: 865.574.1749 Fax: 865.574.4913 laracurzioe@ornl.gov Christine Goudy, Administrative Specialist Tel:

  9. Polyelectrolyte Materials for High Temperature Fuel Cells

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

    Polyelectrolyte Materials for High 3M (3M) Temperature Fuel Cells John B. Kerr Lawrence Berkeley National Laboratory (LBNL) Collaborators: Los Alamos National Laboratory (LANL). February 13, 2007 This presentation does not contain any proprietary or confidential information Team Members: Nitash Blasara, Rachel Segalman, Adam Weber (LBNL). Bryan Pivovar, James Boncella (LANL) Steve Hamrock Objectives * Investigate the use of solid polyelectrolyte proton conductors that do not require the presence

  10. High Temperature PEM - Energy Innovation Portal

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

    Vehicles and Fuels Vehicles and Fuels Hydrogen and Fuel Cell Hydrogen and Fuel Cell Find More Like This Return to Search High Temperature PEM Sandia National Laboratories Contact SNL About This Technology Publications: PDF Document Publication Market Sheet (976 KB) Technology Marketing SummaryPolymer electrolyte fuel cells (PEFCs) have been identified as an attractive electrical power source due to it having a higher efficiency level and being an environmental friendly energy source. In

  11. High-Temperature Falling-Particle Receiver

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

    conceptual drawing illustrates a high-temperature falling-particle receiver system that will achieve greater efficiencies and lower costs. Illustration from Sandia National Laboratories Project Leader: Dr. Cliff Ho ckho@sandia.gov Printed with a renewable-source ink on paper containing at least 50% wastepaper, including 10% post consumer waste. eere.energy.gov * energy.gov/sunshot DOE/GO-102012-3672 * September 2012 MOTIVATION Conventional central receiver technologies are limited to

  12. Preparation of superconductor precursor powders

    DOE Patents [OSTI]

    Bhattacharya, R.

    1998-08-04

    A process for the preparation of a precursor metallic powder composition for use in the subsequent formation of a superconductor. The process comprises the steps of providing an electrodeposition bath comprising an electrolyte medium and a cathode substrate electrode, and providing to the bath one or more soluble salts of one or more respective metals which are capable of exhibiting superconductor properties upon subsequent appropriate treatment. The bath is continually energized to cause the metallic and/or reduced particles formed at the electrode to drop as a powder from the electrode into the bath, and this powder, which is a precursor powder for superconductor production, is recovered from the bath for subsequent treatment. The process permits direct inclusion of all metals in the preparation of the precursor powder, and yields an amorphous product mixed on an atomic scale to thereby impart inherent high reactivity. Superconductors which can be formed from the precursor powder include pellet and powder-in-tube products. 7 figs.

  13. Preparation of superconductor precursor powders

    DOE Patents [OSTI]

    Bhattacharya, Raghunath; Blaugher, Richard D.

    1995-01-01

    A process for the preparation of a precursor metallic powder composition for use in the subsequent formation of a superconductor. The process comprises the steps of providing an electrodeposition bath comprising an electrolyte medium and a cathode substrate electrode, and providing to the bath one or more soluble salts of one or more respective metals, such as nitrate salts of thallium, barium, calcium, and copper, which are capable of exhibiting superconductor properties upon subsequent appropriate treatment. The bath is continually energized to cause the metallic particles formed at the electrode to drop as a powder from the electrode into the bath, and this powder, which is a precursor powder for superconductor production, is recovered from the bath for subsequent treatment. The process permits direct inclusion of thallium in the preparation of the precursor powder, and yields an amorphous product mixed on an atomic scale to thereby impart inherent high reactivity. Superconductors which can be formed from the precursor powder include pellet and powder-in-tube products.

  14. High temperature aqueous stress corrosion testing device

    DOE Patents [OSTI]

    Bornstein, A.N.; Indig, M.E.

    1975-12-01

    A description is given of a device for stressing tensile samples contained within a high temperature, high pressure aqueous environment, thereby permitting determination of stress corrosion susceptibility of materials in a simple way. The stressing device couples an external piston to an internal tensile sample via a pull rod, with stresses being applied to the sample by pressurizing the piston. The device contains a fitting/seal arrangement including Teflon and weld seals which allow sealing of the internal system pressure and the external piston pressure. The fitting/seal arrangement allows free movement of the pull rod and the piston.

  15. Microchannel High-Temperature Recuperator for Fuel Cell Systems...

    Energy Savers [EERE]

    Microchannel High-Temperature Recuperator for Fuel Cell Systems - Fact Sheet, 2014 Microchannel High-Temperature Recuperator for Fuel Cell Systems - Fact Sheet, 2014 FuelCell ...

  16. Low Temperature Combustion Demonstrator for High Efficiency Clean...

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

    Demonstrator for High Efficiency Clean Combustion Low Temperature Combustion Demonstrator for High Efficiency Clean Combustion Applied low temperature combustion to the Navistar ...

  17. Syngas Enhanced High Efficiency Low Temperature Combustion for...

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

    Enhanced High Efficiency Low Temperature Combustion for Clean Diesel Engines Syngas Enhanced High Efficiency Low Temperature Combustion for Clean Diesel Engines A significant ...

  18. A High Temperature Direct Vehicle Exhaust Flowmeter for Heavy...

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

    A High Temperature Direct Vehicle Exhaust Flowmeter for Heavy Duty Diesel Emission Measurements. A High Temperature Direct Vehicle Exhaust Flowmeter for Heavy Duty Diesel Emission ...

  19. High-Speed, Temperature Programmable Gas Chromatography Utilizing...

    Office of Scientific and Technical Information (OSTI)

    High-Speed, Temperature Programmable Gas Chromatography Utilizing a Microfabricated Chip ... Title: High-Speed, Temperature Programmable Gas Chromatography Utilizing a Microfabricated ...

  20. Institute of Chemical Engineering and High Temperature Chemical...

    Open Energy Info (EERE)

    Chemical Engineering and High Temperature Chemical Processes ICEHT Jump to: navigation, search Name: Institute of Chemical Engineering and High Temperature Chemical Processes...

  1. Modoc High School Space Heating Low Temperature Geothermal Facility...

    Open Energy Info (EERE)

    High School Space Heating Low Temperature Geothermal Facility Jump to: navigation, search Name Modoc High School Space Heating Low Temperature Geothermal Facility Facility Modoc...

  2. Henley High School Space Heating Low Temperature Geothermal Facility...

    Open Energy Info (EERE)

    Henley High School Space Heating Low Temperature Geothermal Facility Jump to: navigation, search Name Henley High School Space Heating Low Temperature Geothermal Facility Facility...

  3. Cotulla High School Space Heating Low Temperature Geothermal...

    Open Energy Info (EERE)

    Cotulla High School Space Heating Low Temperature Geothermal Facility Jump to: navigation, search Name Cotulla High School Space Heating Low Temperature Geothermal Facility...

  4. Final Report: Ionization chemistry of high temperature molecular...

    Office of Scientific and Technical Information (OSTI)

    Final Report: Ionization chemistry of high temperature molecular fluids Citation Details In-Document Search Title: Final Report: Ionization chemistry of high temperature molecular ...

  5. Exploring high temperature phenomena related to post-detonation...

    Office of Scientific and Technical Information (OSTI)

    Exploring high temperature phenomena related to post-detonation by an electric arc Citation Details In-Document Search Title: Exploring high temperature phenomena related to ...

  6. High Temperature Fuel Cell (Phosphoric Acid) Manufacturing R...

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

    High Temperature Fuel Cell (Phosphoric Acid) Manufacturing R&D Presented at the NREL ... DC, August 11-12, 2011. PDF icon High Temperature Fuel Cell (Phosphoric Acid) ...

  7. Enhanced High Temperature Performance of NOx Storage/Reduction...

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

    More Documents & Publications Enhanced High Temperature Performance of NOx StorageReduction (NSR) Materials Enhanced High Temperature Performance of NOx StorageReduction (NSR) ...

  8. Enhanced High Temperature Performance of NOx Storage/Reduction...

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

    More Documents & Publications Enhanced High and Low Temperature Performance of NOx Reduction Materials Enhanced High Temperature Performance of NOx StorageReduction (NSR) ...

  9. High Temperature Membrane Working Group Meeting (HTWGM) Agenda...

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

    Meeting (HTWGM) Agenda High Temperature Membrane Working Group Meeting (HTWGM) Agenda Preliminary agenda for the October 10 meeting of the High Temperature Membrane Working Group ...

  10. Lead Research and Development Activity for High Temperature,...

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

    Temperature, Low Relative Humidity Membrane Program Lead Research and Development Activity for High Temperature, Low Relative Humidity Membrane Program A presentation to the High ...

  11. Membrane Development for Medium and High Temperature PEMFC in...

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

    in Europe (Presentation) Membrane Development for Medium and High Temperature PEMFC in Europe (Presentation) Presented at the High Temperature Membrane Working Group Meeting ...

  12. New Membranes for High Temperature Proton Exchange Membrane Fuel...

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

    High Temperature Proton Exchange Membrane Fuel Cells Based on Heteropoly Acids New Membranes for High Temperature Proton Exchange Membrane Fuel Cells Based on Heteropoly Acids ...

  13. High Temperature Membrane Working Group, Minutes of Meeting on...

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

    High Temperature Membrane Working Group, Minutes of Meeting on September 14, 2006 These meeting minutes provide information about the High Temperature Membrane Working Group ...

  14. Agenda of the High Temperature Membrane Working Group Meeting...

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

    Agenda of the High Temperature Membrane Working Group Meeting, Monday, June 9, 2008 Agenda of the High Temperature Membrane Working Group Meeting, Monday, June 9, 2008 HTMWG ...

  15. High Temperature Membrane Working Group Meeting, May 14, 2007...

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

    Meeting, May 14, 2007 High Temperature Membrane Working Group Meeting, May 14, 2007 This agenda provides information about the High Temperature Membrane Working Group Meeting on ...

  16. Preliminary Agenda: October 2008 High Temperature Membrane Working...

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

    Preliminary Agenda: October 2008 High Temperature Membrane Working Group Meeting Preliminary Agenda: October 2008 High Temperature Membrane Working Group Meeting Agenda for October ...

  17. High Temperature Membrane with HUmidification-Independent Cluster...

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

    High Temperature Membrane with HUmidification-Independent Cluster Structure A presentation ... More Documents & Publications High Temperature Membrane Working Group New Proton ...

  18. High Temperature Polymer Membrane Development at Argonne National...

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

    Temperature Polymer Membrane Development at Argonne National Laboratory High Temperature Polymer Membrane Development at Argonne National Laboratory Summary of ANL's high ...

  19. High Temperature Gas Reactors: Assessment of Applicable Codes...

    Office of Scientific and Technical Information (OSTI)

    Technical Report: High Temperature Gas Reactors: Assessment of Applicable Codes and Standards Citation Details In-Document Search Title: High Temperature Gas Reactors: Assessment ...

  20. Topological Hubbard Model and Its High-Temperature Quantum Hall...

    Office of Scientific and Technical Information (OSTI)

    Topological Hubbard Model and Its High-Temperature Quantum Hall Effect Title: Topological Hubbard Model and Its High-Temperature Quantum Hall Effect Authors: Neupert, Titus ; ...

  1. High Operating Temperature Liquid Metal Heat Transfer Fluids...

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

    High Operating Temperature Liquid Metal Heat Transfer Fluids High Operating Temperature Liquid Metal Heat Transfer Fluids This fact sheet describes a UCLA-led solar project to ...

  2. Project Profile: High-Temperature Thermochemical Storage with...

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

    Project Profile: High-Temperature Thermochemical Storage with Redox-Stable Perovskites for Concentrating Solar Power Project Profile: High-Temperature Thermochemical Storage with ...

  3. High Temperature Thermal Array for Next Generation Solar Thermal...

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

    High Temperature Thermal Array for Next Generation Solar Thermal Power Production High Temperature Thermal Array for Next Generation Solar Thermal Power Production This ...

  4. A transient heat transfer model for high temperature solar thermochemi...

    Office of Scientific and Technical Information (OSTI)

    Search Results Journal Article: A transient heat transfer model for high temperature solar ... Title: A transient heat transfer model for high temperature solar thermochemical reactors ...

  5. Low and high Temperature Dual Thermoelectric Generation Waste...

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

    and high Temperature Dual Thermoelectric Generation Waste Heat Recovery System for Light-Duty Vehicles Low and high Temperature Dual Thermoelectric Generation Waste Heat Recovery System ...

  6. Reversible Metal Hydride Thermal Energy Storage for High Temperature...

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

    Reversible Metal Hydride Thermal Energy Storage for High Temperature Power Generation Systems Reversible Metal Hydride Thermal Energy Storage for High Temperature Power Generation ...

  7. Superconductor rotor cooling system

    DOE Patents [OSTI]

    Gamble, Bruce B.; Sidi-Yekhlef, Ahmed; Schwall, Robert E.; Driscoll, David I.; Shoykhet, Boris A.

    2004-11-02

    A system for cooling a superconductor device includes a cryocooler located in a stationary reference frame and a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with a rotating reference frame in which the superconductor device is located. A method of cooling a superconductor device includes locating a cryocooler in a stationary reference frame, and transferring heat from a superconductor device located in a rotating reference frame to the cryocooler through a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with the rotating reference frame.

  8. Superconductor rotor cooling system

    DOE Patents [OSTI]

    Gamble, Bruce B.; Sidi-Yekhlef, Ahmed; Schwall, Robert E.; Driscoll, David I.; Shoykhet, Boris A.

    2002-01-01

    A system for cooling a superconductor device includes a cryocooler located in a stationary reference frame and a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with a rotating reference frame in which the superconductor device is located. A method of cooling a superconductor device includes locating a cryocooler in a stationary reference frame, and transferring heat from a superconductor device located in a rotating reference frame to the cryocooler through a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with the rotating reference frame.

  9. Electrical bushing for a superconductor element

    DOE Patents [OSTI]

    Mirebeau, Pierre; Lallouet, Nicolas; Delplace, Sebastien; Lapierre, Regis

    2010-05-04

    The invention relates to an electrical bushing serving to make a connection at ambient temperature to a superconductor element situated in an enclosure at cryogenic temperature. The electrical bushing passes successively through an enclosure at intermediate temperature between ambient temperature and cryogenic temperature, and an enclosure at ambient temperature, and it comprises a central electrical conductor surrounded by an electrically insulating sheath. According to the invention, an electrically conductive screen connected to ground potential surrounds the insulating sheath over a section that extends from the end of the bushing that is in contact with the enclosure at cryogenic temperature at least as far as the junction between the enclosure at intermediate temperature and the enclosure at ambient temperature. The invention is more particularly applicable to making a connection to a superconductor cable.

  10. Thallium 2223 high Tc superconductor in a silver matrix and its magnetic shielding, hermal cycle and time aging properties

    SciTech Connect (OSTI)

    Fei, X.; He, W.S.; Havenhill, A.

    1994-12-31

    Superconducting Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} (Tl2223) was ground to powder. Mixture with silver powder (0--80% weight) and press to desired shape. After proper annealing, one can get good silver-content Tl2223 bulk superconductor. It is time-stable and has good superconducting property as same as pure Tl2223. It also has better mechanical property and far better thermal cycle property than pure Tl2223.

  11. Hotline IV …High Temperature ESP | Department of Energy

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

    Hotline IV …High Temperature ESP Hotline IV …High Temperature ESP Project Objective: Increase temperature rating of high temperature ESPs. high_dhruva_hotline_iv.pdf (1.64 MB) More Documents & Publications Creation of an Engineered Geothermal System through Hydraulic and Thermal Stimulation Novel Energy Conversion Equipment for Low Temperature Geothermal Resources High-Temperature Motor Windings for Downhole Pumps Used in Geothermal Energy Production

  12. High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Turnquist, Norman; Qi, Xuele; Raminosoa, Tsarafidy; Salas, Ken; Samudrala, Omprakash; Shah, Manoj; Van Dam, Jeremy; Yin, Weijun; Zia, Jalal

    2013-12-20

    This report summarizes the progress made during the April 01, 2010 – December 30, 2013 period under Cooperative Agreement DE-EE0002752 for the U.S. Department of Energy entitled “High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems.” The overall objective of this program is to advance the technology for well fluids lifting systems to meet the foreseeable pressure, temperature, and longevity needs of the Enhanced Geothermal Systems (EGS) industry for the coming ten years. In this program, lifting system requirements for EGS wells were established via consultation with industry experts and site visits. A number of artificial lift technologies were evaluated with regard to their applicability to EGS applications; it was determined that a system based on electric submersible pump (ESP) technology was best suited to EGS. Technical barriers were identified and a component-level technology development program was undertaken to address each barrier, with the most challenging being the development of a power-dense, small diameter motor that can operate reliably in a 300°C environment for up to three years. Some of the targeted individual component technologies include permanent magnet motor construction, high-temperature insulation, dielectrics, bearings, seals, thrust washers, and pump impellers/diffusers. Advances were also made in thermal management of electric motors. In addition to the overall system design for a full-scale EGS application, a subscale prototype was designed and fabricated. Like the full-scale design, the subscale prototype features a novel “flow-through-the-bore” permanent magnet electric motor that combines the use of high temperature materials with an internal cooling scheme that limits peak internal temperatures to <330°C. While the full-scale high-volume multi-stage pump is designed to lift up to 80 kg/s of process water, the subscale prototype is based on a production design that can pump 20 kg/s and has been modified

  13. Creep resistant high temperature martensitic steel

    DOE Patents [OSTI]

    Hawk, Jeffrey A.; Jablonski, Paul D.; Cowen, Christopher J.

    2015-11-13

    The disclosure provides a creep resistant alloy having an overall composition comprised of iron, chromium, molybdenum, carbon, manganese, silicon, nickel, vanadium, niobium, nitrogen, tungsten, cobalt, tantalum, boron, and potentially additional elements. In an embodiment, the creep resistant alloy has a molybdenum equivalent Mo(eq) from 1.475 to 1.700 wt. % and a quantity (C+N) from 0.145 to 0.205. The overall composition ameliorates sources of microstructural instability such as coarsening of M.sub.23C.sub.6 carbides and MX precipitates, and mitigates or eliminates Laves and Z-phase formation. A creep resistant martensitic steel may be fabricated by preparing a melt comprised of the overall composition followed by at least austenizing and tempering. The creep resistant alloy exhibits improved high-temperature creep strength in the temperature environment of around 650.degree. C.

  14. High Temperature Battery for Drilling Applications

    SciTech Connect (OSTI)

    Josip Caja

    2009-12-31

    In this project rechargeable cells based on the high temperature electrochemical system Na/beta''-alumina/S(IV) in AlCl3/NaCl were developed for application as an autonomous power source in oil/gas deep drilling wells. The cells operate in the temperature range from 150 C to 250 C. A prototype DD size cell was designed and built based on the results of finite element analysis and vibration testing. The cell consisted of stainless steel case serving as anode compartment with cathode compartment installed in it and a seal closing the cell. Critical element in cell design and fabrication was hermetically sealing the cell. The seal had to be leak tight, thermally and vibration stable and compatible with electrode materials. Cathode compartment was built of beta''-alumina tube which served as an electrolyte, separator and cathode compartment.

  15. Preparation of highly oxidized RBa.sub.2 Cu.sub.4 O.sub.8 superconductors

    DOE Patents [OSTI]

    Morris, Donald E.

    1991-01-01

    Novel superconducting materials in the form of compounds, structures or phases are formed by performing otherwise known syntheses in a highly oxidizing atmosphere rather than that created by molecular oxygen at atmospheric pressure or below. This leads to the successful synthesis of novel superconducting compounds which are thermodynamically stable at the conditions under which they are formed. The compounds and structures thus formed are substantially nonsusceptible to variations in their oxygen content when subjected to changing temperatures, thereby forming a temperature-stable substantially single phase crystal.

  16. Acid Doped Membranes for High Temperature PEMFC | Department of Energy

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

    Acid Doped Membranes for High Temperature PEMFC Acid Doped Membranes for High Temperature PEMFC Presentation on Acid Doped Membranes for High Temperature PEMFC to the High Temperature Membrane Working Group, May 25, 2004 in Philadelphia, PA. pemfc_danish.pdf (641.12 KB) More Documents & Publications Membrane Development for Medium and High Temperature PEMFC in Europe (Presentation) PBI-Phosphoric Acid Based Membrane Electrode Assemblies: Status Update CARISMA: A Networking Project for High

  17. High Temperature Materials Laboratory third annual report

    SciTech Connect (OSTI)

    Tennery, V.J.; Foust, F.M.

    1990-12-01

    The High Temperature Materials Laboratory has completed its third year of operation as a designated DOE User Facility at the Oak Ridge National Laboratory. Growth of the user program is evidenced by the number of outside institutions who have executed user agreements since the facility began operation in 1987. A total of 88 nonproprietary agreements (40 university and 48 industry) and 20 proprietary agreements (1 university, 19 industry) are now in effect. Sixty-eight nonproprietary research proposals (39 from university, 28 from industry, and 1 other government facility) and 8 proprietary proposals were considered during this reporting period. Research projects active in FY 1990 are summarized.

  18. High temperature regenerable hydrogen sulfide removal agents

    DOE Patents [OSTI]

    Copeland, Robert J.

    1993-01-01

    A system for high temperature desulfurization of coal-derived gases using regenerable sorbents. One sorbent is stannic oxide (tin oxide, SnO.sub.2), the other sorbent is a metal oxide or mixed metal oxide such as zinc ferrite (ZnFe.sub.2 O.sub.4). Certain otherwise undesirable by-products, including hydrogen sulfide (H.sub.2 S) and sulfur dioxide (SO.sub.2) are reused by the system, and elemental sulfur is produced in the regeneration reaction. A system for refabricating the sorbent pellets is also described.

  19. High power densities from high-temperature material interactions

    SciTech Connect (OSTI)

    Morris, J.F.

    1981-01-01

    Thermionic energy conversion (TEC) and metallic-fluid heat pipes (MFHPs) offer important and unique advantages in terrestrial and space energy processing. And they are well suited to serve together synergistically. TEC and MFHPs operate through working-fluid vaporization, condensation cycles that accept great thermal power densities at high temperatures. TEC and MFHPs have apparently simple, isolated performance mechanisms that are somewhat similar. And they also have obviously difficult, complected material problems that again are somewhat similar. Intensive investigation reveals that aspects of their operating cycles and material problems tend to merge: high-temperature material effects determine the level and lifetime of performance. Simplified equations verify the preceding statement for TEC and MFHPs. Material properties and interactions exert primary influences on operational effectiveness. And thermophysicochemical stabilities dictate operating temperatures which regulate the thermoemissive currents of TEC and the vaporization flow rates of MFHPs. Major high-temperature material problems of TEC and MFHPs have been solved. These solutions lead to productive, cost-effective applications of current TEC and MFHPs - and point to significant improvements with anticipated technological gains.

  20. High temperature insulation for ceramic matrix composites

    DOE Patents [OSTI]

    Merrill, Gary B.; Morrison, Jay Alan

    2000-01-01

    A ceramic composition is provided to insulate ceramic matrix composites under high temperature, high heat flux environments. The composite comprises a plurality of hollow oxide-based spheres of varios dimentions, a phosphate binder, and at least one oxide filler powder, whereby the phosphate binder partially fills gaps between the spheres and the filler powders. The spheres are situated in the phosphate binder and the filler powders such that each sphere is in contact with at least one other sphere. The spheres may be any combination of Mullite spheres, Alumina spheres, or stabilized Zirconia spheres. The filler powder may be any combination of Alumina, Mullite, Ceria, or Hafnia. Preferably, the phosphate binder is Aluminum Ortho-Phosphate. A method of manufacturing the ceramic insulating composition and its application to CMC substates are also provided.

  1. High temperature insulation for ceramic matrix composites

    DOE Patents [OSTI]

    Merrill, Gary B.; Morrison, Jay Alan

    2001-01-01

    A ceramic composition is provided to insulate ceramic matrix composites under high temperature, high heat flux environments. The composition comprises a plurality of hollow oxide-based spheres of various dimensions, a phosphate binder, and at least one oxide filler powder, whereby the phosphate binder partially fills gaps between the spheres and the filler powders. The spheres are situated in the phosphate binder and the filler powders such that each sphere is in contact with at least one other sphere. The spheres may be any combination of Mullite spheres, Alumina spheres, or stabilized Zirconia spheres. The filler powder may be any combination of Alumina, Mullite, Ceria, or Hafnia. Preferably, the phosphate binder is Aluminum Ortho-Phosphate. A method of manufacturing the ceramic insulating composition and its application to CMC substrates are also provided.

  2. High temperature insulation for ceramic matrix composites

    DOE Patents [OSTI]

    Merrill, Gary B.; Morrison, Jay Alan

    2004-01-13

    A ceramic composition is provided to insulate ceramic matrix composites under high temperature, high heat flux environments. The composition comprises a plurality of hollow oxide-based spheres of various dimensions, a phosphate binder, and at least one oxide filler powder, whereby the phosphate binder partially fills gaps between the spheres and the filler powders. The spheres are situated in the phosphate binder and the filler powders such that each sphere is in contact with at least one other sphere. The spheres may be any combination of Mullite spheres, Alumina spheres, or stabilized Zirconia spheres. The filler powder may be any combination of Alumina, Mullite, Ceria, or Hafnia. Preferably, the phosphate binder is Aluminum Ortho-Phosphate. A method of manufacturing the ceramic insulating composition and its application to CMC substrates are also provided.

  3. Apparatus for accurately measuring high temperatures

    DOE Patents [OSTI]

    Smith, D.D.

    The present invention is a thermometer used for measuring furnace temperatures in the range of about 1800/sup 0/ to 2700/sup 0/C. The thermometer comprises a broadband multicolor thermal radiation sensor positioned to be in optical alignment with the end of a blackbody sight tube extending into the furnace. A valve-shutter arrangement is positioned between the radiation sensor and the sight tube and a chamber for containing a charge of high pressure gas is positioned between the valve-shutter arrangement and the radiation sensor. A momentary opening of the valve shutter arrangement allows a pulse of the high gas to purge the sight tube of air-borne thermal radiation contaminants which permits the radiation sensor to accurately measure the thermal radiation emanating from the end of the sight tube.

  4. High temperature lined conduits, elbows and tees

    DOE Patents [OSTI]

    De Feo, Angelo (Passaic, NJ); Drewniany, Edward (Bergen, NJ)

    1982-01-01

    A high temperature lined conduit comprising, a liner, a flexible insulating refractory blanket around and in contact with the liner, a pipe member around the blanket and spaced therefrom, and castable rigid refractory material between the pipe member and the blanket. Anchors are connected to the inside diameter of the pipe and extend into the castable material. The liner includes male and female slip joint ends for permitting thermal expansion of the liner with respect to the castable material and the pipe member. Elbows and tees of the lined conduit comprise an elbow liner wrapped with insulating refractory blanket material around which is disposed a spaced elbow pipe member with castable refractory material between the blanket material and the elbow pipe member. A reinforcing band is connected to the elbow liner at an intermediate location thereon from which extend a plurality of hollow tubes or pins which extend into the castable material to anchor the lined elbow and permit thermal expansion. A method of fabricating the high temperature lined conduit, elbows and tees is also disclosed which utilizes a polyethylene layer over the refractory blanket after it has been compressed to maintain the refractory blanket in a compressed condition until the castable material is in place. Hot gases are then directed through the interior of the liner for evaporating the polyethylene and setting the castable material which permits the compressed blanket to come into close contact with the castable material.

  5. Agenda for the High Temperature Membrane Working Group Meeting | Department

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

    of Energy Agenda for the High Temperature Membrane Working Group Meeting Agenda for the High Temperature Membrane Working Group Meeting This agenda provides information about the Agenda for the High Temperature Membrane Working Group Meeting on September 14, 2006. htmwg_sept06_agenda.pdf (48.31 KB) More Documents & Publications Discussion Overview High Temperature Membrane Working Group, Minutes of Meeting on September 14, 2006 High Temperature Membrane Working Group Meeting, May 14,

  6. Agenda: High Temperature Membrane Working Group Meeting | Department of

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

    Energy Agenda: High Temperature Membrane Working Group Meeting Agenda: High Temperature Membrane Working Group Meeting Agenda for the High Temperature Membrane Working Group (HTMWG) meeting on May 18, 2009, in Arlington, Virginia htmwg_may09_agenda.pdf (64 KB) More Documents & Publications HTMWG, May 18, 2009, Welcome! High Temperature Membrane Working Group Meeting, May 14, 2007 Agenda of the High Temperature Membrane Working Group Meeting, Monday, June 9, 2008

  7. Membrane Development for Medium and High Temperature PEMFC in Europe

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

    (Presentation) | Department of Energy Development for Medium and High Temperature PEMFC in Europe (Presentation) Membrane Development for Medium and High Temperature PEMFC in Europe (Presentation) Presented at the High Temperature Membrane Working Group Meeting (HTMWG) held October 10, 2007 in Washington, D.C. htwmg_oct07_jones.pdf (3.12 MB) More Documents & Publications CARISMA: A Networking Project for High Temperature PEMFC MEA Activities in Europe Minutes of the High Temperature

  8. Preliminary Agenda: October 2008 High Temperature Membrane Working Group

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

    Meeting | Department of Energy Preliminary Agenda: October 2008 High Temperature Membrane Working Group Meeting Preliminary Agenda: October 2008 High Temperature Membrane Working Group Meeting Agenda for October 2008 High Temperature Membrane Working Group Meeting in Honolulu, Hawaii. htmwg_agenda_meeting_1008.pdf (27.08 KB) More Documents & Publications Minutes of the October 2008 Meeting of the High Temperature Membrane Working Group Agenda for the High Temperature Membrane Working

  9. 2005 High Temperature Membrane Working Group Meeting Archives | Department

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

    of Energy 5 High Temperature Membrane Working Group Meeting Archives 2005 High Temperature Membrane Working Group Meeting Archives View 2005 meeting presentations from the High Temperature Membrane Working Group. October 20, 2005, Los Angeles, California Conductivity Testing in High Temperature Membranes, Jim Boncella, Los Alamos National Laboratory Photo of participants at the High Temperature Membrane Working Group Meeting in October 2005 May 26, 2005, Arlington, Virginia Agenda Model

  10. High Temperature Membrane Working Group Meeting, May 14, 2007 | Department

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

    of Energy Meeting, May 14, 2007 High Temperature Membrane Working Group Meeting, May 14, 2007 This agenda provides information about the High Temperature Membrane Working Group Meeting on May 14, 2007 in Arlington, Va. htmwg07_agenda.pdf (79.9 KB) More Documents & Publications High Temperature Membrane Working Group High Temperature Membrane Working Group Minutes Agenda: High Temperature Membrane Working Group Meeting

  11. Ceramic membranes for high temperature hydrogen separation

    SciTech Connect (OSTI)

    Fain, D.E.; Roettger, G.E.

    1996-08-01

    Ceramic gas separation membranes can provide very high separation factors if the pore size is sufficiently small to separate gas molecules by molecular sieving and if oversized pores are adequately limited. Ceramic membranes typically have some pores that are substantially larger than the mean pore size and that should be regarded as defects. To assess the effects of such defects on the performance of ceramic membranes, a simple mathematical model has been developed to describe flow through a gas separation membrane that has a primary mode of flow through very small pores but that has a secondary mode of flow through undesirably large pores. This model permits separation factors to be calculated for a specified gas pair as a function of the molecular weights and molecular diameters of the gases, the membrane pore diameter, and the diameter and number of defects. This model will be described, and key results from the model will be presented. The separation factors of the authors membranes continue to be determined using a permeance test system that measures flows of pure gases through a membrane at temperatures up to 275{degrees}C. A primary goal of this project for FY 1996 is to develop a mixed gas separation system for measuring the separation efficiency of membranes at higher temperatures. Performance criteria have been established for the planned mixed gas separation system and design of the system has been completed. The test system is designed to measure the separation efficiency of membranes at temperatures up to 600{degrees}C and pressures up to 100 psi by separating the constituents of a gas mixture containing hydrogen. The system will accommodate the authors typical experimental membrane that is tubular and has a diameter of about 9 mm and a length of about 23 cm. The design of the new test system and its expected performance will be discussed.

  12. Theory of antiferromagnetic superconductors

    SciTech Connect (OSTI)

    Machida, K.; Nokura, K.; Matsubara, T.

    1980-09-01

    In this paper a theory is presented of antiferromagnetic superconductors in which a spin-density wave (SDW) ordering with a wave vector Q may coexist with superconductivity. The effect of the antiferromagnetic molecular field h/sub Q/(T) on the Cooper pairing is studied, and it is shown that, below the magnetic transition temperature T/sub N/' the Bardeen-Cooper-Schruffer coupling parameter is reduced by a factor of (1-constsuch thatub Q/(T)epsilon/sub F/) due to the formation of energy gaps of SDW on the Fermi surface along Q and this reduction can explain the anomaly in the upper critical field H/sub c/2 just below T/sub N/ as observed in RMo/sub 6/S/sub 8/ (R=Gd, Tb, and Dy). Taking account of both the spin-orbit scattering and spin-fluctuation effect near T/sub N/ in addition to the effect of h/sub Q/(T), a theoretical calculation of the superconducting transition temperature T/sub c/ and H/sub c/2(T) is performed. Detailed quantitative comparisons between theory and experiments on H/sub c/2(T) are made with fairly good accord for the above three compounds. Some speculation is given to discuss the remaining descrepancies between theory and experiments and certain phenomena not yet explained by the theory.

  13. Low Temperature Combustion Demonstrator for High Efficiency Clean...

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

    Low-Temperature Combustion Demonstrator for High-Efficiency Clean Combustion Impact of Variable Valve Timing on Low Temperature Combustion Multicylinder Diesel Engine Design for ...

  14. High Country Rose Greenhouses Greenhouse Low Temperature Geothermal...

    Open Energy Info (EERE)

    Rose Greenhouses Greenhouse Low Temperature Geothermal Facility Jump to: navigation, search Name High Country Rose Greenhouses Greenhouse Low Temperature Geothermal Facility...

  15. Enhanced High and Low Temperature Performance of NOx Reduction...

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

    and Low Temperature Performance of NOx Reduction Materials Enhanced High and Low Temperature Performance of NOx Reduction Materials 2013 DOE Hydrogen and Fuel Cells Program and ...

  16. Carbon Capture Turned Upside Down: High-Temperature Adsorption...

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

    Carbon Capture Turned Upside Down: High-Temperature Adsorption & Low-Temperature Desorption (HALD) Previous Next List Joos, Lennart; Lejaeghere, Kurt; Huck, Johanna M.; Van...

  17. A potential Rosetta Stone of high temperature superconductivity...

    Office of Science (SC) Website

    for the high temperature superconductivity. Summary Superconductivity enables the flow of electricity without any loss of energy, but this extremely-low temperature...

  18. Filter unit for use at high temperatures

    DOE Patents [OSTI]

    Ciliberti, David F.; Lippert, Thomas E.

    1988-01-01

    A filtering unit for filtering particulates from high temperature gases uses a spiral ceramic spring to bias a ceramic, tubular filter element into sealing contact with a flange about an aperture of a metallic tube sheet. The ceramic spiral spring may contact the upper edge of the filter element and be restrained by a stop member spaced from one end of the tube sheet, or the spring may contact the bottom of the filter element and be restrained by a support member spaced from the opposite end of the tube sheet. The stop member and support member are adjustably secured to the tube sheet. A filtering system uses the ceramic spiral spring to bias a plurality of ceramic, tubular filter elements in a respective plurality of apertures in a tube sheet which divides a vessel into upper and lower enclosed sections.

  19. High temperature coatings for gas turbines

    DOE Patents [OSTI]

    Zheng, Xiaoci Maggie

    2003-10-21

    Coating for high temperature gas turbine components that include a MCrAlX phase, and an aluminum-rich phase, significantly increase oxidation and cracking resistance of the components, thereby increasing their useful life and reducing operating costs. The aluminum-rich phase includes aluminum at a higher concentration than aluminum concentration in the MCrAlX alloy, and an aluminum diffusion-retarding composition, which may include cobalt, nickel, yttrium, zirconium, niobium, molybdenum, rhodium, cadmium, indium, cerium, iron, chromium, tantalum, silicon, boron, carbon, titanium, tungsten, rhenium, platinum, and combinations thereof, and particularly nickel and/or rhenium. The aluminum-rich phase may be derived from a particulate aluminum composite that has a core comprising aluminum and a shell comprising the aluminum diffusion-retarding composition.

  20. High temperature chemically resistant polymer concrete

    DOE Patents [OSTI]

    Sugama, T.; Kukacka, L.E.

    High temperature chemically resistant, non-aqueous polymer concrete composites consist of about 12 to 20% by weight of a water-insoluble polymer binder. The binder is polymerized in situ from a liquid vinyl-type monomer or mixture of vinyl containing monomers such as triallylcyanurate, styrene, acrylonitrile, acrylamide, methacrylamide, methyl-methacrylate, trimethylolpropane trimethacrylate and divinyl benzene. About 5 to 40% by weight of a reactive inorganic filler selected from the group consisting of tricalcium silicate and dicalcium silicate and mixtures containing less than 2% free lime, and about 48 to 83% by weight of silica sand/ and a free radical initiator such as di-tert-butyl peroxide, azobisisobutyronitrile, benzoyl peroxide, lauryl peroxide, other orgaic peroxides and combinations to initiate polymerization of the monomer in the presence of the inorganic filers are used.

  1. Multilayer ultra-high-temperature ceramic coatings

    DOE Patents [OSTI]

    Loehman, Ronald E.; Corral, Erica L.

    2012-03-20

    A coated carbon-carbon composite material with multiple ceramic layers to provide oxidation protection from ultra-high-temperatures, where if the carbon-carbon composite material is uninhibited with B.sub.4C particles, then the first layer on the composite material is selected from ZrB.sub.2 and HfB.sub.2, onto which is coated a layer of SiC coated and if the carbon-carbon composite material is inhibited with B.sub.4C particles, then protection can be achieved with a layer of SiC and a layer of either ZrB.sub.2 and HfB.sub.2 in any order.

  2. Pressure sensor for high-temperature liquids

    DOE Patents [OSTI]

    Forster, George A.

    1978-01-01

    A pressure sensor for use in measuring pressures in liquid at high temperatures, especially such as liquid sodium or liquid potassium, comprises a soft diaphragm in contact with the liquid. The soft diaphragm is coupled mechanically to a stiff diaphragm. Pressure is measured by measuring the displacment of both diaphragms, typically by measuring the capacitance between the stiff diaphragm and a fixed plate when the stiff diaphragm is deflected in response to the measured pressure through mechanical coupling from the soft diaphragm. Absolute calibration is achieved by admitting gas under pressure to the region between diaphragms and to the region between the stiff diaphragm and the fixed plate, breaking the coupling between the soft and stiff diaphragms. The apparatus can be calibrated rapidly and absolutely.

  3. High temperature low friction surface coating

    DOE Patents [OSTI]

    Bhushan, Bharat

    1980-01-01

    A high temperature, low friction, flexible coating for metal surfaces which are subject to rubbing contact includes a mixture of three parts graphite and one part cadmium oxide, ball milled in water for four hours, then mixed with thirty percent by weight of sodium silicate in water solution and a few drops of wetting agent. The mixture is sprayed 12-15 microns thick onto an electro-etched metal surface and air dried for thirty minutes, then baked for two hours at 65.degree. C. to remove the water and wetting agent, and baked for an additional eight hours at about 150.degree. C. to produce the optimum bond with the metal surface. The coating is afterwards burnished to a thickness of about 7-10 microns.

  4. Turbine vane with high temperature capable skins

    DOE Patents [OSTI]

    Morrison, Jay A.

    2012-07-10

    A turbine vane assembly includes an airfoil extending between an inner shroud and an outer shroud. The airfoil can include a substructure having an outer peripheral surface. At least a portion of the outer peripheral surface is covered by an external skin. The external skin can be made of a high temperature capable material, such as oxide dispersion strengthened alloys, intermetallic alloys, ceramic matrix composites or refractory alloys. The external skin can be formed, and the airfoil can be subsequently bi-cast around or onto the skin. The skin and the substructure can be attached by a plurality of attachment members extending between the skin and the substructure. The skin can be spaced from the outer peripheral surface of the substructure such that a cavity is formed therebetween. Coolant can be supplied to the cavity. Skins can also be applied to the gas path faces of the inner and outer shrouds.

  5. High Temperature Membrane Working Group | Department of Energy

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

    High Temperature Membrane Working Group High Temperature Membrane Working Group The High Temperature Membrane Working Group consists of government, industry, and university researchers interested in developing high temperature membranes for fuel cells. Description Technical Targets Meetings Contacts Description Polymer electrolyte membrane (PEM) fuel cells typically operate at temperatures no higher than 60°C-80°C due to structural limitations of the membrane. Operating PEM fuel cell stacks at

  6. 2004 High Temperature Membrane Working Group Meeting Archives | Department

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

    of Energy 4 High Temperature Membrane Working Group Meeting Archives 2004 High Temperature Membrane Working Group Meeting Archives View 2004 meeting presentations from the High Temperature Membrane Working Group. October 8, 2004, Honolulu, Hawaii High Temperature Fuel Cell Performance of Sulfonated Poly (phenylene) Proton Conducting Polymers, Chris J. Cornelius, Cy H. Fujimoto, Michael A. Hickner, Darin Leonhardt, Sandia National Laboratories Higher Temperature PEM Composite Systems for Fuel

  7. 2003 High Temperature Membrane Working Group Meeting Archives | Department

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

    of Energy High Temperature Membrane Working Group Meeting Archives 2003 High Temperature Membrane Working Group Meeting Archives View 2003 meeting presentations from the High Temperature Membrane Working Group. October 17, 2003, Orlando, Florida High T Membrane Development at Foster-Miller, Bindu Nair, Foster-Miller Highly Sulfonated Polymers for High Temperature Applications, Morton Litt, Case Western Reserve University Assessing Transport in New Electrolytes, Bryan Pivovar, LANL

  8. Topological properties of ferromagnetic superconductors

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Cheung, Alfred K. C.; Raghu, S.

    2016-04-27

    Here, a variety of heavy fermion superconductors, such as UCoGe, UGe2, and URhGe exhibit a striking coexistence of bulk ferromagnetism and superconductivity. In the first two materials, the magnetic moment decreases with pressure, and vanishes at a ferromagnetic quantum critical point (qcp). Remarkably, the superconductivity in UCoGe varies smoothly with pressure across the qcp and exists in both the ferromagnetic and paramagnetic regimes. We argue that in UCoGe, spin-orbit interactions stabilize a time-reversal invariant odd-parity superconductor in the high pressure paramagnetic regime. Based on a simple phenomenological model, we predict that the transition from the paramagnetic normal state to themore » phase where superconductivity and ferromagnetism coexist is a first-order transition.« less

  9. High Temperature Integrated Thermoelectric Ststem and Materials

    SciTech Connect (OSTI)

    Mike S. H. Chu

    2011-06-06

    The final goal of this project is to produce, by the end of Phase II, an all ceramic high temperature thermoelectric module. Such a module design integrates oxide ceramic n-type, oxide ceramic p-type materials as thermoelectric legs and oxide ceramic conductive material as metalizing connection between n-type and p-type legs. The benefits of this all ceramic module are that it can function at higher temperatures (> 700 C), it is mechanically and functionally more reliable and it can be scaled up to production at lower cost. With this all ceramic module, millions of dollars in savings or in new opportunities recovering waste heat from high temperature processes could be made available. A very attractive application will be to convert exhaust heat from a vehicle to reusable electric energy by a thermoelectric generator (TEG). Phase I activities were focused on evaluating potential n-type and p-type oxide compositions as the thermoelectric legs. More than 40 oxide ceramic powder compositions were made and studied in the laboratory. The compositions were divided into 6 groups representing different material systems. Basic ceramic properties and thermoelectric properties of discs sintered from these powders were measured. Powders with different particles sizes were made to evaluate the effects of particle size reduction on thermoelectric properties. Several powders were submitted to a leading thermoelectric company for complete thermoelectric evaluation. Initial evaluation showed that when samples were sintered by conventional method, they had reasonable values of Seebeck coefficient but very low values of electrical conductivity. Therefore, their power factors (PF) and figure of merits (ZT) were too low to be useful for high temperature thermoelectric applications. An unconventional sintering method, Spark Plasma Sintering (SPS) was determined to produce better thermoelectric properties. Particle size reduction of powders also was found to have some positive benefits

  10. High-Temperature High-Efficiency Solar Thermoelectric Generators

    SciTech Connect (OSTI)

    Baranowski, LL; Warren, EL; Toberer, ES

    2014-03-01

    Inspired by recent high-efficiency thermoelectric modules, we consider thermoelectrics for terrestrial applications in concentrated solar thermoelectric generators (STEGs). The STEG is modeled as two subsystems: a TEG, and a solar absorber that efficiently captures the concentrated sunlight and limits radiative losses from the system. The TEG subsystem is modeled using thermoelectric compatibility theory; this model does not constrain the material properties to be constant with temperature. Considering a three-stage TEG based on current record modules, this model suggests that 18% efficiency could be experimentally expected with a temperature gradient of 1000A degrees C to 100A degrees C. Achieving 15% overall STEG efficiency thus requires an absorber efficiency above 85%, and we consider two methods to achieve this: solar-selective absorbers and thermally insulating cavities. When the TEG and absorber subsystem models are combined, we expect that the STEG modeled here could achieve 15% efficiency with optical concentration between 250 and 300 suns.

  11. Superconductor-semiconductor hybrid devices, circuits, and systems

    SciTech Connect (OSTI)

    Kroger, H.; Hilbert, C.; Gibson, D.A.; Ghoshal, U.; Smith, L.N.

    1989-08-01

    The discovery of superconductors whose critical temperatures are above liquid nitrogen temperature has prompted considerable interest in hybrid superconducting-semiconducting electronics applications. This paper reviews the efforts to hybridize these technologies. Some of these efforts have already been demonstrated on a laboratory scale; others are at present just theoretical proposals. Hybridization is possible on the system, circuit, and device levels. The authors review studies of the applications of superconductors for interconnecting semiconductor systems and combining semiconductor and superconductor devices to enhance the performance of both digital and analog systems. Novel circuit combinations of superconducting and semiconducting devices are mentioned, as are proposal to combine these materials on the device level.

  12. Large area bulk superconductors

    DOE Patents [OSTI]

    Miller, Dean J.; Field, Michael B.

    2002-01-01

    A bulk superconductor having a thickness of not less than about 100 microns is carried by a polycrystalline textured substrate having misorientation angles at the surface thereof not greater than about 15.degree.; the bulk superconductor may have a thickness of not less than about 100 microns and a surface area of not less than about 50 cm.sup.2. The textured substrate may have a thickness not less than about 10 microns and misorientation angles at the surface thereof not greater than about 15.degree.. Also disclosed is a process of manufacturing the bulk superconductor and the polycrystalline biaxially textured substrate material.

  13. High Temperature Interactions of Antimony with Nickel

    SciTech Connect (OSTI)

    Marina, Olga A.; Pederson, Larry R.

    2012-07-01

    In this chapter, the surface and bulk interactions of antimony with the Ni-based anodes in solid oxide fuel cells (SOFC) will be discussed. High fuel flexibility is a significant advantage of SOFCs, allowing the direct use of fossil and bio fuels without a hydrogen separation unit. Synthesis gas derived from coal and biomass consists of a mixture of hydrogen, carbon monoxide, carbon dioxide, and steam, but finite amounts of tars and trace impurities such as S, Se, P, As, Sb, Cd, Pb, Cl, etc, are also always present. While synthesis gas is commonly treated with a series of chemical processes and scrubbers to remove the impurities, complete purification is not economical. Antimony is widely distributed in coals. During coal gasification antimony is volatilized, such that contact with the SOFC anodes and other SOFC parts, e.g., interconnect, current collecting wires, fuel gas supplying tubing, is most likely. This chapter addresses the following topics: high temperature Ni - Sb interactions; alteration phase, Ni3Sb, Ni5Sb2, NiSb, formation; thermochemical modeling; impact of Sb on the electrocatalytic activity of Ni toward the fuel oxidation and the presence of other impurities (sulfur, in particular); converted anode structural instability during long-term SOFC operation; comparison with nickel heterogeneous catalysts.

  14. Workshop on research needs and opportunities in high-temperature superconductivity held in Copper Mountain, Colorado in 19-20 August 1991. Final report, 1 Jun 91-30 Apr 92

    SciTech Connect (OSTI)

    Shaw, D.T.; Kroger, H.; Jin, S.; Gubser, D.U.; Falco, C.M.

    1991-11-01

    This is the report of the Workshop on New Research Opportunities in Superconductivity held at Copper Mountain, Colorado on August 19-20,1991. The workshop is a follow-up to two previous meetings to evaluate progress in superconductivity. The first, held at Copper Mountain, Colorado in 1983, focuses on low-temperature superconductors (LTS), while the second-in 1988 examined the progress of low-temperature materials and the potential of the then recently-discovered high-temperature superconductors (HTS). The summaries of these two superconductivity workshops were published in Cryogenics (July 1984, p.378; and November 1988, p.711). This workshop was the first in this series to concentrate largely on high-temperature superconductors. Its objectives were to identify the barriers limiting progress in high-temperature materials and to assess research areas that are ripe for important advances. The workshop was organized in four sessions, with Robert C.Dynes and Victor J. Emery leading the session on Fundamentals, Charles M. Falco and Donald U. Gubser leading the session on Materials, David K. Christen and Harry Kroger leading the session on Thin Films and Devices, and Sungho Jin and David T. Shaw leading the session on Bulk Materials and Large-Scale Applications. The organizational committee for the workshop consisted of David K. Christen, Alan F. Clark, Robert C. Dynes, Donald H. Liebenberg, David L. Nelson, and David T. Shaw (chair).

  15. Nonlinear vs. bolometric radiation response and phonon thermal conductance in graphene-superconductor junctions

    SciTech Connect (OSTI)

    Vora, Heli; Nielsen, Bent; Du, Xu [Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York (United States)

    2014-02-21

    Graphene is a promising candidate for building fast and ultra-sensitive bolometric detectors due to its weak electron-phonon coupling and low heat capacity. In order to realize a practical graphene-based bolometer, several important issues, including the nature of radiation response, coupling efficiency to the radiation and the thermal conductance need to be carefully studied. Addressing these issues, we present graphene-superconductor junctions as a viable option to achieve efficient and sensitive bolometers, with the superconductor contacts serving as hot electron barriers. For a graphene-superconductor device with highly transparent interfaces, the resistance readout in the presence of radio frequency radiation is dominated by non-linear response. On the other hand, a graphene-superconductor tunnel device shows dominantly bolometric response to radiation. For graphene devices fabricated on SiO{sub 2} substrates, we confirm recent theoretical predictions of T{sup 2} temperature dependence of phonon thermal conductance in the presence of disorder in the graphene channel at low temperatures.

  16. Progress in high-temperature superconducting transistors and other devices; Proceedings of the SPIE Meeting, Vol. 1394, Santa Clara, CA, Oct. 4, 5, 1990

    SciTech Connect (OSTI)

    Singh, R.; Narayan, J.; Shaw, D.T.

    1991-01-01

    Various papers on progress in high-temperature superconducting transistors and other devices are presented. Individual topics addressed include: superconductor/semiconductor structure and its application to superconducting devices, superconducting YBa{sup 2}Cu{sub 3}O{sub 7} films on Si and GaAs with conducting indium tin oxide buffer layers, high-temperature superconducting Josephson junction devices, planar SNS Josephson junctions using multilayer Bi system, YBa{sup 2}Cu{sub 3}O{sub 7-x}/Au/Nb device structures, cleaved surfaces of high Tc films for making SNS structures, high-temperature superconductive microwave technology for space applications, high-Tc superconducting infrared bolometric detector, thin film processing and device fabrication in the Tl-Ca-Ba-Cu-O system. Also discussed are: grain-oriented high--Tc superconductors and their applications, speed of optically controlled superconducting devices, effect of laser irradiation on superconducting properties of laser-deposited YBa{sub 2}Cu{sub 3}O{sub 7} thin films, role of buffer layers in the laser-ablated films on metallic substrates, progress toward device applications using MOCVD of TlBaCaCuO, versatility of metal organic chemical vapor deposition process for fabrication of high-quality YBCO superconducting thin films.

  17. Ceramic superconductor/metal composite materials employing the superconducting proximity effect

    DOE Patents [OSTI]

    Holcomb, Matthew J.

    2002-01-01

    Superconducting composite materials having particles of superconducting material disposed in a metal matrix material with a high electron-boson coupling coefficient (.lambda.). The superconducting particles can comprise any type of superconductor including Laves phase materials, Chevrel phase materials, A15 compounds, and perovskite cuprate ceramics. The particles preferably have dimensions of about 10-500 nanometers. The particles preferably have dimensions larger than the superconducting coherence length of the superconducting material. The metal matrix material has a .lambda. greater than 0.2, preferably the .lambda. is much higher than 0.2. The metal matrix material is a good proximity superconductor due to its high .lambda.. When cooled, the superconductor particles cause the metal matrix material to become superconducting due to the proximity effect. In cases where the particles and the metal matrix material are chemically incompatible (i.e., reactive in a way that destroys superconductivity), the particles are provided with a thin protective metal coating. The coating is chemically compatible with the particles and metal matrix material. High Temperature Superconducting (HTS) cuprate ceramic particles are reactive and therefore require a coating of a noble metal resistant to oxidation (e.g., silver, gold). The proximity effect extends through the metal coating. With certain superconductors, non-noble metals can be used for the coating.

  18. Refractory thermowell for continuous high temperature measurement of molten metal

    DOE Patents [OSTI]

    Thiesen, Todd J.

    1992-01-01

    An apparatus for the continuous high temperature measurement of materials in vessels lined with rammed or cast refractory materials. A refractory housing member is integral with the refractory lining of the vessel and contains a plurality of high temperature sensing means, such as thermocouples. A face of the housing is flush with the refractory lining and contacts the high temperature material contained in the vessel. Continuous temperature measurement is achieved by a means which is coupled to the thermocouples for indicating the temperature.

  19. High Temperature Polymer Membrane Development at Argonne National

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

    Laboratory | Department of Energy Temperature Polymer Membrane Development at Argonne National Laboratory High Temperature Polymer Membrane Development at Argonne National Laboratory Summary of ANL's high temperature polymer membrane work presented to the High Temperature Membrane Working Group Meeting, Orlando FL, October 17, 2003 membrane_wrk_grp_mt.pdf (587.66 KB) More Documents & Publications Polyphenylene Sulfonic Acid: a new PEM Higher Temperature PEM Composite Systems for Fuel

  20. American Superconductor Corporation AMSC | Open Energy Information

    Open Energy Info (EERE)

    Superconductor Corporation AMSC Jump to: navigation, search Name: American Superconductor Corporation (AMSC) Place: Westborough, Massachusetts Zip: 15810 Sector: Wind energy...

  1. The electrodynamics of oxide superconductors

    SciTech Connect (OSTI)

    Anlage, S.M.; Pambianchi, M.; Findikoglu, A.T.

    1994-12-31

    The authors present a brief review of results on the surface impedance of cuprate superconductors, focusing mainly on YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (YBCO) and evidence of d-wave superconductivity in that material. They then discuss the recent results on BaK-Bi-O thin films, and the effects of DC electric fields on the surface impedance of YBCO films. A summary of their data on high quality thin films and single crystals of the electron-doped Nd{sub 1.85}Ce{sub 0.15}Ce{sub 0.15}CuO{sub 4{minus}{delta}} (NCCO) cuprate superconductor follows. Surprisingly, the measurements on NCCO are consistent with the behavior of an s-wave BCS superconductor, in striking contrast to recent results on YBCO. Finally they discuss some of the interesting potential implications of d-wave superconductivity for microwave applications of the cuprates.

  2. High temperature thermoelectric properties of the solid-solution...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: High temperature thermoelectric properties of the solid-solution zintl phase EuCd6-xZnxSb Citation Details In-Document Search Title: High temperature ...

  3. Development of a 100-Watt High Temperature Thermoelectric Generator

    Broader source: Energy.gov [DOE]

    Test results for low and high temperature thermoelectric generators (TEG) those for a 530-watt BiTe TEG; design and construction of a 100-watt high temperature TEG currently in fabrication.

  4. CARISMA: A Networking Project for High Temperature PEMFC MEA...

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

    This presentation on high temperature proton exchange membrane fuel cells was given at the High Temperature Membrane Working Group Meeting in May 2007. htmwgcarisma.pdf (1.44 MB) ...

  5. Minutes of the High Temperature Membrane Working Group Meeting...

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

    Minutes of the High Temperature Membrane Working Group Meeting, Monday, May 18, 2009 Summary of the meeting on Monday, May 18, 2009, for the High Temperature Membrane Working Group ...

  6. Hydrogen permeation behavior through F82H at high temperature...

    Office of Scientific and Technical Information (OSTI)

    Hydrogen permeation behavior through F82H at high temperature Citation Details In-Document Search Title: Hydrogen permeation behavior through F82H at high temperature F82H is a ...

  7. Development of a High-Temperature Diagnostics-While-Drilling...

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

    Development of a High-Temperature Diagnostics-While-Drilling Tool Development of a High-Temperature Diagnostics-While-Drilling Tool This report documents work performed in the ...

  8. Austenitic stainless steel for high temperature applications

    DOE Patents [OSTI]

    Johnson, Gerald D.; Powell, Roger W.

    1985-01-01

    This invention describes a composition for an austenitic stainless steel which has been found to exhibit improved high temperature stress rupture properties. The composition of this alloy is about (in wt. %): 12.5 to 14.5 Cr; 14.5 to 16.5 Ni; 1.5 to 2.5 Mo; 1.5 to 2.5 Mn; 0.1 to 0.4 Ti; 0.02 to 0.08 C; 0.5 to 1.0 Si; 0.01 maximum, N; 0.02 to 0.08 P; 0.002 to 0.008 B; 0.004-0.010 S; 0.02-0.05 Nb; 0.01-0.05 V; 0.005-0.02 Ta; 0.02-0.05 Al; 0.01-0.04 Cu; 0.02-0.05 Co; 0.03 maximum, As; 0.01 maximum, O; 0.01 maximum, Zr; and with the balance of the alloy being essentially iron. The carbon content of the alloy is adjusted such that wt. % Ti/(wt. % C+wt. % N) is between 4 and 6, and most preferably about 5. In addition the sum of the wt. % P+wt. % B+wt. % S is at least 0.03 wt. %. This alloy is believed to be particularly well suited for use as fast breeder reactor fuel element cladding.

  9. Atomic processes in high temperature plasmas

    SciTech Connect (OSTI)

    Hahn, Y.

    1991-07-01

    This is the final report on the project Atomic Processes in High Temperature Plasmas', which has been completed in June 30, 1991. The original contract started in 1978. The dielectronic recombination (DR) rate coefficients were calculated for ions with the number of electrons N = 1, 2, 3, 4, 5, 10, 11, and 12. The result was then used to construct a new and improved rate formula. Other important resonant processes, which are closely related to DR, were also studied to interpret experiments and to test the DR theory. The plasma field and the density effects on the rate coefficients was found to be important, and a consistent correction procedure is being developed. The available data on the DR rates and their accuracy do not yet fully meet the requirement for plasma modeling; there are serious gaps in the available data, and the currently adopted theoretical procedure needs improvements. Critical assessment of the current status of the DR problem is presented, and possible future work needed is summarized.

  10. High performance internal reforming unit for high temperature fuel cells

    DOE Patents [OSTI]

    Ma, Zhiwen; Venkataraman, Ramakrishnan; Novacco, Lawrence J.

    2008-10-07

    A fuel reformer having an enclosure with first and second opposing surfaces, a sidewall connecting the first and second opposing surfaces and an inlet port and an outlet port in the sidewall. A plate assembly supporting a catalyst and baffles are also disposed in the enclosure. A main baffle extends into the enclosure from a point of the sidewall between the inlet and outlet ports. The main baffle cooperates with the enclosure and the plate assembly to establish a path for the flow of fuel gas through the reformer from the inlet port to the outlet port. At least a first directing baffle extends in the enclosure from one of the sidewall and the main baffle and cooperates with the plate assembly and the enclosure to alter the gas flow path. Desired graded catalyst loading pattern has been defined for optimized thermal management for the internal reforming high temperature fuel cells so as to achieve high cell performance.

  11. A Discussion of Conductivity Testing in High Temperature Membranes (lessons

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

    learned in assessing transport) | Department of Energy of Conductivity Testing in High Temperature Membranes (lessons learned in assessing transport) A Discussion of Conductivity Testing in High Temperature Membranes (lessons learned in assessing transport) Presentation on conductivity testing in high temperature membranes given by Jim Boncella of Los Alamos National Laboratory at the High Temperature Membrane Working Group meeting in October 2005. htmwg05_boncella.pdf (567.61 KB) More

  12. NanoCapillary Network Proton Conducting Membranes for High Temperature

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

    Hydrogen/Air Fuel Cells | Department of Energy NanoCapillary Network Proton Conducting Membranes for High Temperature Hydrogen/Air Fuel Cells NanoCapillary Network Proton Conducting Membranes for High Temperature Hydrogen/Air Fuel Cells A presentation to the High Temperature Membranes Working Group meeting, May 19, 2006. pintauro.pdf (276.25 KB) More Documents & Publications High Temperature Membrane Working Group Vehicle Technologies Office Merit Review 2016: Li-Ion Battery Anodes from

  13. Full Reviews: High-temperature Tools and Drilling

    Broader source: Energy.gov [DOE]

    Below are the project presentations and respective peer reviewer comments for High-temperature Tools and Drilling.

  14. 2006 DOE Hydrogen Program Dimensionally Stable High Temperature Membranes |

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

    Department of Energy Dimensionally Stable High Temperature Membranes 2006 DOE Hydrogen Program Dimensionally Stable High Temperature Membranes A presentation to the High Temperature Membranes Working Group meeting, May 19, 2006. mittelsteadt.pdf (843.4 KB) More Documents & Publications High Temperature Membrane Working Group, Minutes of Meeting on September 14, 2006 Measuring Physical Properties of Polymer Electrolyte Membranes Membrane Performance and Durability Overview for Automotive

  15. Minutes of the High Temperature Membrane Working Group Meeting | Department

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

    of Energy Meeting Minutes of the High Temperature Membrane Working Group Meeting High Temperature Membrane Working Group members meet October 10, 2007 in Washington, DC. minutes_of_htmwg_mtg.pdf (92.47 KB) More Documents & Publications High Temperature Membrane Working Group Meeting (HTWGM) Agenda Strategy for Aging Tests of Fuel Cell Membranes (Presentation) CARISMA: A Networking Project for High Temperature PEMFC MEA Activities in Europe

  16. High Temperature Membrane Working Group Meeting (HTWGM) Agenda | Department

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

    of Energy Meeting (HTWGM) Agenda High Temperature Membrane Working Group Meeting (HTWGM) Agenda Preliminary agenda for the October 10 meeting of the High Temperature Membrane Working Group htwmg_oct07_agenda.pdf (11.24 KB) More Documents & Publications Strategy for Aging Tests of Fuel Cell Membranes (Presentation) Agenda of the High Temperature Membrane Working Group Meeting, Monday, June 9, 2008 Preliminary Agenda: October 2008 High Temperature Membrane Working Group Meeting

  17. High Temperature Membrane with HUmidification-Independent Cluster Structure

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

    | Department of Energy with HUmidification-Independent Cluster Structure High Temperature Membrane with HUmidification-Independent Cluster Structure A presentation to the High Temperature Membranes Working Group meeting, May 19, 2006. lipp.pdf (132.46 KB) More Documents & Publications High Temperature Membrane Working Group New Proton Conductive Composit Materials with Co-continuous Phases Using Functionalized and Crosslinkable TFE/VDF Fluoropolymers High temperature membranes for DMFC

  18. Chemical Substitution and High Pressure Effects on Superconductors in the LnOBiS$_2$ (Ln = La-Nd) System

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Fang, Yuankan; Wolowiec, Christian T.; Yazici, Duygu; Maple, M. Brian

    2015-12-14

    A large number of compounds which contain BiS$_2$ layers exhibit enhanced superconductivity upon electron doping. Much interest and research effort has been focused on BiS$_2$-based compounds which provide new opportunities for exploring the nature of superconductivity. Important to the study of BiS2-based superconductors is the relation between structure and superconductivity. By modifying either the superconducting BiS$_2$ layers or the blocking layers in these layered compounds, one can effectively tune the lattice parameters, local atomic environment, electronic structure, and other physical properties of these materials. In this article, we will review some of the recent progress on research of the effectsmore » of chemical substitution in BiS$_2$-based compounds, with special attention given to the compounds in the LnOBiSS$_2$ (Ln = La-Nd) system. Strategies which are reported to be essential in optimizing superconductivity of these materials will also be discussed.« less

  19. Continuous lengths of oxide superconductors

    DOE Patents [OSTI]

    Kroeger, Donald M.; List, III, Frederick A.

    2000-01-01

    A layered oxide superconductor prepared by depositing a superconductor precursor powder on a continuous length of a first substrate ribbon. A continuous length of a second substrate ribbon is overlaid on the first substrate ribbon. Sufficient pressure is applied to form a bound layered superconductor precursor powder between the first substrate ribbon and the second substrate ribbon. The layered superconductor precursor is then heat treated to establish the oxide superconducting phase. The layered oxide superconductor has a smooth interface between the substrate and the oxide superconductor.

  20. High Temperature Membrane Working Group Minutes | Department of Energy

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

    Meeting minutes from the May 14, 2007 meeting of the High Temperature Membrane Working Group. htmwg_minutes_may07.pdf (309.75 KB) More Documents & Publications High Temperature Membrane Working Group Meeting, May 14, 2007 In Plane Conductivity Testing, BekkTech LLC High Temperature Membrane Working Group

  1. High Temperature Membrane Working Group Minutes | Department of Energy

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

    Minutes from the High Temperature Membrane Working Group May 19, 2006 meeting. htwg_minutes_051906.pdf (14.47 KB) More Documents & Publications Discussion Overview High Temperature Membrane Working Group, Minutes of Meeting on September 14, 2006 Minutes of the High Temperature Membrane Working Group Meeting, Monday, May 18, 2009

  2. High Temperature Membrane Working Group | Department of Energy

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

    Group High Temperature Membrane Working Group This presentation provides an overview of the High Temperature Membrane Working Group Meeting in May 2007. htmwg_kopasz_intro.pdf (305.34 KB) More Documents & Publications HTMWG, May 18, 2009, Welcome! Universal Membrane Classification Scheme: Maximizing the Return on High Temperature PEM Membrane Research Membranes and MEAs for Dry, Hot Operating Conditions

  3. Cedarville Elementary & High School Space Heating Low Temperature...

    Open Energy Info (EERE)

    Cedarville Elementary & High School Space Heating Low Temperature Geothermal Facility Jump to: navigation, search Name Cedarville Elementary & High School Space Heating Low...

  4. Low-Temperature Combustion Demonstrator for High-Efficiency Clean...

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

    for High-Efficiency Clean Combustion Low-Temperature Combustion Demonstrator for High-Efficiency Clean Combustion 2010 DOE Vehicle Technologies and Hydrogen Programs Annual...

  5. High-Temperature, Air-Cooled Traction Drive Inverter Packaging...

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

    More Documents & Publications Air-Cooled Traction Drive Inverter Benchmarking of Competitive Technologies High Temperature, High Voltage Fully Integrated Gate Driver Circuit

  6. Alternative Refrigerant Evaluation for High-Ambient-Temperature

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

    Environments | Department of Energy Alternative Refrigerant Evaluation for High-Ambient-Temperature Environments Alternative Refrigerant Evaluation for High-Ambient-Temperature Environments Performance of alternative refrigerants compared with R-22 (mineral oil) at extreme test conditions (outdoor temperature 55°C and indoor temperature 29°C). Image: ORNL. Performance of alternative refrigerants compared with R-22 (mineral oil) at extreme test conditions (outdoor temperature 55°C and

  7. Ultra-High Temperature Distributed Wireless Sensors

    SciTech Connect (OSTI)

    May, Russell; Rumpf, Raymond; Coggin, John; Davis, Williams; Yang, Taeyoung; O'Donnell, Alan; Bresnahan, Peter

    2013-03-31

    Research was conducted towards the development of a passive wireless sensor for measurement of temperature in coal gasifiers and coal-fired boiler plants. Approaches investigated included metamaterial sensors based on guided mode resonance filters, and temperature-sensitive antennas that modulate the frequency of incident radio waves as they are re-radiated by the antenna. In the guided mode resonant filter metamaterial approach, temperature is encoded as changes in the sharpness of the filter response, which changes with temperature because the dielectric loss of the guided mode resonance filter is temperature-dependent. In the mechanically modulated antenna approach, the resonant frequency of a vibrating cantilever beam attached to the antenna changes with temperature. The vibration of the beam perturbs the electrical impedance of the antenna, so that incident radio waves are phase modulated at a frequency equal to the resonant frequency of the vibrating beam. Since the beam resonant frequency depends on temperature, a Doppler radar can be used to remotely measure the temperature of the antenna. Laboratory testing of the guided mode resonance filter failed to produce the spectral response predicted by simulations. It was concluded that the spectral response was dominated by spectral reflections of radio waves incident on the filter. Laboratory testing of the mechanically modulated antenna demonstrated that the device frequency shifted incident radio waves, and that the frequency of the re-radiated waves varied linearly with temperature. Radio wave propagation tests in the convection pass of a small research boiler plant identified a spectral window between 10 and 13 GHz for low loss propagation of radio waves in the interior of the boiler.

  8. NOvel Refractory Materials for High Alkali, High Temperature Environments

    SciTech Connect (OSTI)

    Hemrick, J.G.; Griffin, R.

    2011-08-30

    Refractory materials can be limited in their application by many factors including chemical reactions between the service environment and the refractory material, mechanical degradation of the refractory material by the service environment, temperature limitations on the use of a particular refractory material, and the inability to install or repair the refractory material in a cost effective manner or while the vessel was in service. The objective of this project was to address the need for new innovative refractory compositions by developing a family of novel MgO-Al2O3 spinel or other similar magnesia/alumina containing unshaped refractory composition (castables, gunnables, shotcretes, etc) utilizing new aggregate materials, bond systems, protective coatings, and phase formation techniques (in-situ phase formation, altered conversion temperatures, accelerated reactions, etc). This family of refractory compositions would then be tailored for use in high-temperature, highalkaline industrial environments like those found in the aluminum, chemical, forest products, glass, and steel industries. A research team was formed to carry out the proposed work led by Oak Ridge National Laboratory (ORNL) and was comprised of the academic institution Missouri University of Science and Technology (MS&T), and the industrial company MINTEQ International, Inc. (MINTEQ), along with representatives from the aluminum, chemical, glass, and forest products industries. The two goals of this project were to produce novel refractory compositions which will allow for improved energy efficiency and to develop new refractory application techniques which would improve the speed of installation. Also methods of hot installation were sought which would allow for hot repairs and on-line maintenance leading to reduced process downtimes and eliminating the need to cool and reheat process vessels.

  9. High temperature, minimally invasive optical sensing modules

    DOE Patents [OSTI]

    Riza, Nabeel Agha; Perez, Frank

    2008-02-05

    A remote temperature sensing system includes a light source selectively producing light at two different wavelengths and a sensor device having an optical path length that varies as a function of temperature. The sensor receives light emitted by the light source and redirects the light along the optical path length. The system also includes a detector receiving redirected light from the sensor device and generating respective signals indicative of respective intensities of received redirected light corresponding to respective wavelengths of light emitted by the light source. The system also includes a processor processing the signals generated by the detector to calculate a temperature of the device.

  10. High temperature pressurized high frequency testing rig and test method

    DOE Patents [OSTI]

    De La Cruz, Jose; Lacey, Paul

    2003-04-15

    An apparatus is described which permits the lubricity of fuel compositions at or near temperatures and pressures experienced by compression ignition fuel injector components during operation in a running engine. The apparatus consists of means to apply a measured force between two surfaces and oscillate them at high frequency while wetted with a sample of the fuel composition heated to an operator selected temperature. Provision is made to permit operation at or near the flash point of the fuel compositions. Additionally a method of using the subject apparatus to simulate ASTM Testing Method D6079 is disclosed, said method involving using the disclosed apparatus to contact the faces of prepared workpieces under a measured load, sealing the workface contact point into the disclosed apparatus while immersing said contact point between said workfaces in a lubricating media to be tested, pressurizing and heating the chamber and thereby the fluid and workfaces therewithin, using the disclosed apparatus to impart a differential linear motion between the workpieces at their contact point until a measurable scar is imparted to at least one workpiece workface, and then evaluating the workface scar.

  11. Development of Advanced High Temperature Fuel Cell Membranes | Department

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

    of Energy Advanced High Temperature Fuel Cell Membranes Development of Advanced High Temperature Fuel Cell Membranes Presentation on Development of Advanced High Temperature Fuel Cell Membranes to the High Temperature Membrane Working Group Meeting held in Arlington, Virginia, May 26,2005. htmwg05_irvin_doe_review.pdf (108.37 KB) More Documents & Publications 2006 DOE Hydrogen Program Poly (p-phenylene Sulfonic Acid)s with Frozen-in Free Volume for use in High Temperature Fuel Cells

  12. High Temperature Optical Gas Sensing - Energy Innovation Portal

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

    High Temperature Optical Gas Sensing Optical sensors integrated with advanced sensing materials for high temperature embedded gas sensing National Energy Technology Laboratory Contact NETL About This Technology Publications: PDF Document Publication Partnership Opportunity Notice for High Temperature Optical Gas Sensing (366 KB) Technology Marketing Summary This series of inventions addresses harsh environment sensing at temperatures above approximately 400-500oC using novel sensing materials

  13. High temperature membranes for DMFC (and PEFC) applications | Department of

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

    Energy temperature membranes for DMFC (and PEFC) applications High temperature membranes for DMFC (and PEFC) applications Presentation on High temperature membranes for DMFCs (and PEFCs) to the High Temperature Membrane Working Group, May 25, 2004 in Philadelphia, PA. italy_philadelphia.pdf (646.9 KB) More Documents & Publications Introduction to DMFCs - Advanced Materials and Concepts for Portable Power Fuel Cells Advanced Materials and Concepts for Portable Power Fuel Cells

  14. NOVEL REFRACTORY MATERIALS FOR HIGH ALKALI, HIGH TEMPERATURE ENVIRONMENTS

    SciTech Connect (OSTI)

    Hemrick, James Gordon; Smith, Jeffrey D; O'Hara, Kelley; Rodrigues-Schroer, Angela; Colavito,

    2012-08-01

    A project was led by Oak Ridge National Laboratory (ORNL) in collaboration with a research team comprised of the academic institution Missouri University of Science and Technology (MS&T), and the industrial company MINTEQ International, Inc. (MINTEQ), along with representatives from the aluminum, chemical, glass, and forest products industries. The project was to address the need for new innovative refractory compositions by developing a family of novel MgO-Al 2O3, MgAl2O4, or other similar spinel structured or alumina-based unshaped refractory compositions (castables, gunnables, shotcretes, etc.) utilizing new aggregate materials, bond systems, protective coatings, and phase formation techniques (in-situ phase formation, altered conversion temperatures, accelerated reactions, etc). This family of refractory compositions would then be tailored for use in high-temperature, high-alkaline industrial environments like those found in the aluminum, chemical, forest products, glass, and steel industries. Both practical refractory development experience and computer modeling techniques were used to aid in the design of this new family of materials. The newly developed materials were expected to offer alternative material choices for high-temperature, high-alkali environments that were capable of operating at higher temperatures (goal of increasing operating temperature by 100-200oC depending on process) or for longer periods of time (goal of twice the life span of current materials or next process determined service increment). This would lead to less process down time, greater energy efficiency for associated manufacturing processes (more heat kept in process), and materials that could be installed/repaired in a more efficient manner. The overall project goal was a 5% improvement in energy efficiency (brought about through a 20% improvement in thermal efficiency) resulting in a savings of 3.7 TBtu/yr (7.2 billion ft3 natural gas) by the year 2030. Additionally, new

  15. High Temperature Membrane Working Group Meeting Minutes | Department of

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

    Energy Meeting Minutes High Temperature Membrane Working Group Meeting Minutes Minutes of the High Temperature Membrane Working Group Meeting held Oct. 14, 2010, in Las Vegas, NV high_temp_oct_2010_meeting.pdf (71.86 KB) More Documents & Publications Some durability considerations for proton exchange membranes Agenda for the High Temperature Membrane Working Group Meeting Progress and Status on Through-Plane Resistance and Conductivity Measurement of Fuel Cell Membranes

  16. High temperature bias line stabilized current sources

    DOE Patents [OSTI]

    Patterson, R.B. III.

    1984-09-11

    A compensation device for the base of emitter follower configured bipolar transistors becoming operable at elevated temperatures including a bipolar transistor of a geometry of not more than half the geometry of the bipolar emitter follower having its collector connected to the base of the emitter follower and its base and emitter connected together and to the emitter of the emitter follower. 1 fig.

  17. High temperature bias line stabilized current sources

    DOE Patents [OSTI]

    Patterson, III, Raymond B.

    1984-01-01

    A compensation device for the base of emitter follower configured bipolar transistors becoming operable at elevated temperatures including a bipolar transistor of a geometry of not more than half the geometry of the bipolar emitter follower having its collector connected to the base of the emitter follower and its base and emitter connected together and to the emitter of the emitter follower.

  18. High temperature ceramic composition for hydrogen retention

    DOE Patents [OSTI]

    Webb, R.W.

    1974-01-01

    A ceramic coating for H retention in fuel elements is described. The coating has relatively low thermal neutron cross section, is not readily reduced by H at 1500 deg F, is adherent to the fuel element base metal, and is stable at reactor operating temperatures. (JRD)

  19. Cryogenic deformation of high temperature superconductive composite structures

    DOE Patents [OSTI]

    Roberts, Peter R.; Michels, William; Bingert, John F.

    2001-01-01

    An improvement in a process of preparing a composite high temperature oxide superconductive wire is provided and involves conducting at least one cross-sectional reduction step in the processing preparation of the wire at sub-ambient temperatures.

  20. Preparation of Bi-Sr-Ca-Cu-O superconductors from oxide-glass precursors

    DOE Patents [OSTI]

    Hinks, David G.; Capone, II, Donald W.

    1992-01-01

    A superconductor and precursor therefor from oxide mixtures of Ca, Sr, Bi and Cu. Glass precursors quenched to elevated temperatures result in glass free of crystalline precipitates having enhanced mechanical properties. Superconductors are formed from the glass precursors by heating in the presence of oxygen to a temperature below the melting point of the glass.

  1. High temperature expanding cement composition and use

    DOE Patents [OSTI]

    Nelson, Erik B.; Eilers, Louis H.

    1982-01-01

    A hydratable cement composition useful for preparing a pectolite-containing expanding cement at temperatures above about 150.degree. C. comprising a water soluble sodium salt of a weak acid, a 0.1 molar aqueous solution of which salt has a pH of between about 7.5 and about 11.5, a calcium source, and a silicon source, where the atomic ratio of sodium to calcium to silicon ranges from about 0.3:0.6:1 to about 0.03:1:1; aqueous slurries prepared therefrom and the use of such slurries for plugging subterranean cavities at a temperature of at least about 150.degree. C. The invention composition is useful for preparing a pectolite-containing expansive cement having about 0.2 to about 2 percent expansion, by volume, when cured at at least 150.degree. C.

  2. Surface modification of high temperature iron alloys

    DOE Patents [OSTI]

    Park, J.H.

    1995-06-06

    A method and article of manufacture of a coated iron based alloy are disclosed. The method includes providing an iron based alloy substrate, depositing a silicon containing layer on the alloy surface while maintaining the alloy at a temperature of about 700--1200 C to diffuse silicon into the alloy surface and exposing the alloy surface to an ammonia atmosphere to form a silicon/oxygen/nitrogen containing protective layer on the iron based alloy. 13 figs.

  3. High temperature desulfurization of synthesis gas

    DOE Patents [OSTI]

    Najjar, Mitri S.; Robin, Allen M.

    1989-01-01

    The hot process gas stream from the partial oxidation of sulfur-containing heavy liquid hydrocarbonaceous fuel and/or sulfur-containing solid carbonaceous fuel comprising gaseous mixtures of H.sub.2 +CO, sulfur-containing gases, entrained particulate carbon, and molten slag is passed through the unobstructed central passage of a radiant cooler where the temperature is reduced to a temperature in the range of about 1800.degree. F. to 1200.degree. F. From about 0 to 95 wt. % of the molten slag and/or entrained material may be removed from the hot process gas stream prior to the radiant cooler with substantially no reduction in temperature of the process gas stream. In the radiant cooler, after substantially all of the molten slag has solidified, the sulfur-containing gases are contacted with a calcium-containing material to produce calcium sulfide. A partially cooled stream of synthesis gas, reducing gas, or fuel gas containing entrained calcium sulfide particulate matter, particulate carbon, and solidified slag leaves the radiant cooler containing a greatly reduced amount of sulfur-containing gases.

  4. Rotational viscometer for high-pressure high-temperature fluids

    DOE Patents [OSTI]

    Carr, Kenneth R.

    1985-01-01

    The invention is a novel rotational viscometer which is well adapted for use with fluids at high temperatures and/or pressures. In one embodiment, the viscometer includes a substantially non-magnetic tube having a closed end and having an open end in communication with a fluid whose viscosity is to be determined. An annular drive magnet is mounted for rotation about the tube. The tube encompasses and supports a rotatable shaft assembly which carries a rotor, or bob, for insertion in the fluid. Affixed to the shaft are (a) a second magnet which is magnetically coupled to the drive magnet and (b) a third magnet. In a typical operation, the drive magnet is rotated to turn the shaft assembly while the shaft rotor is immersed in the fluid. The viscous drag on the rotor causes the shaft assembly to lag the rotation of the drive magnet by an amount which is a function of the amount of viscous drag. A first magnetic pickup generates a waveform whose phase is a function of the angular position of the drive magnet. A second magnetic pickup generates a waveform whose phase is a function of the angular position of the third magnet. An output is generated indicative of the phase difference between the two waveforms.

  5. Rotational viscometer for high-pressure, high-temperature fluids

    DOE Patents [OSTI]

    Carr, K.R.

    1983-06-06

    The invention is a novel rotational viscometer which is well adapted for use with fluids at high temperatures and/or pressures. In one embodiment, the viscometer include a substantially non-magnetic tube having a closed end and having an open end in communication with a fluid whose viscosity is to be determined. An annular drive magnet is mounted for rotation about the tube. The tube encompasses and supports a rotatable shaft assembly which carries a rotor, or bob, for insertion in the fluid. Affixed to the shaft are (a) a second magnet which is magnetically coupled to the drive magnet and (b) a third magnet. In a typical operation, the drive magnet is rotated to turn the shaft assembly while the shaft rotor is immersed in the fluid. The viscous drag on the rotor causes the shaft assembly to lag the rotation of the drive magnet by an amount which is a function of the amount of viscous drag. A first magnetic pickup generates a waveform whose phase is a function of the angular position of the drive magnet. A second magnetic pickup generates a waveform whose phase is a function of the angular position of the third magnet. Means are provided to generate an output indicative of the phase difference between the two waveforms. The viscometer is comparatively simple, inexpensive, rugged, and does not require shaft seals.

  6. ANALYSIS OF A HIGH TEMPERATURE GAS-COOLED REACTOR POWERED HIGH TEMPERATURE ELECTROLYSIS HYDROGEN PLANT

    SciTech Connect (OSTI)

    M. G. McKellar; E. A. Harvego; A. M. Gandrik

    2010-11-01

    An updated reference design for a commercial-scale high-temperature electrolysis (HTE) plant for hydrogen production has been developed. The HTE plant is powered by a high-temperature gas-cooled reactor (HTGR) whose configuration and operating conditions are based on the latest design parameters planned for the Next Generation Nuclear Plant (NGNP). The current HTGR reference design specifies a reactor power of 600 MWt, with a primary system pressure of 7.0 MPa, and reactor inlet and outlet fluid temperatures of 322°C and 750°C, respectively. The reactor heat is used to produce heat and electric power to the HTE plant. A Rankine steam cycle with a power conversion efficiency of 44.4% was used to provide the electric power. The electrolysis unit used to produce hydrogen includes 1.1 million cells with a per-cell active area of 225 cm2. The reference hydrogen production plant operates at a system pressure of 5.0 MPa, and utilizes a steam-sweep system to remove the excess oxygen that is evolved on the anode (oxygen) side of the electrolyzer. The overall system thermal-to-hydrogen production efficiency (based on the higher heating value of the produced hydrogen) is 42.8% at a hydrogen production rate of 1.85 kg/s (66 million SCFD) and an oxygen production rate of 14.6 kg/s (33 million SCFD). An economic analysis of this plant was performed with realistic financial and cost estimating The results of the economic analysis demonstrated that the HTE hydrogen production plant driven by a high-temperature helium-cooled nuclear power plant can deliver hydrogen at a competitive cost. A cost of $3.03/kg of hydrogen was calculated assuming an internal rate of return of 10% and a debt to equity ratio of 80%/20% for a reactor cost of $2000/kWt and $2.41/kg of hydrogen for a reactor cost of $1400/kWt.

  7. A summary of high-temperature electronics research and development

    SciTech Connect (OSTI)

    Thome, F.V.; King, D.B.

    1991-10-18

    Current and future needs in automative, aircraft, space, military, and well logging industries require operation of electronics at higher temperatures than today's accepted limit of 395 K. Without the availability of high-temperature electronics, many systems must operate under derated conditions or must accept severe mass penalties required by coolant systems to maintain electronic temperatures below critical levels. This paper presents ongoing research and development in the electronics community to bring high-temperature electronics to commercial realization. Much of this work was recently reviewed at the First International High-Temperature Electronics Conference held 16--20 June 1991 in Albuquerque, New Mexico. 4 refs., 1 tab.

  8. High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    Project objective: Advance the technology for well fluids lifting systems to meet the foreseeable pressure; temperature; and longevity needs of the Enhanced Geothermal Systems (EGS) industry.

  9. Scaling Studies for High Temperature Test Facility and Modular High Temperature Gas-Cooled Reactor

    SciTech Connect (OSTI)

    Richard R. Schult; Paul D. Bayless; Richard W. Johnson; James R. Wolf; Brian Woods

    2012-02-01

    The Oregon State University (OSU) High Temperature Test Facility (HTTF) is an integral experimental facility that will be constructed on the OSU campus in Corvallis, Oregon. The HTTF project was initiated, by the U.S. Nuclear Regulatory Commission (NRC), on September 5, 2008 as Task 4 of the 5-year High Temperature Gas Reactor Cooperative Agreement via NRC Contract 04-08-138. Until August, 2010, when a DOE contract was initiated to fund additional capabilities for the HTTF project, all of the funding support for the HTTF was provided by the NRC via their cooperative agreement. The U.S. Department of Energy (DOE) began their involvement with the HTTF project in late 2009 via the Next Generation Nuclear Plant (NGNP) project. Because the NRC's interests in HTTF experiments were only centered on the depressurized conduction cooldown (DCC) scenario, NGNP involvement focused on expanding the experimental envelope of the HTTF to include steady-state operations and also the pressurized conduction cooldown (PCC).

  10. McMillan-Rowell Like Oscillations in a Superconductor-InAs/GaSb-Superconductor Junction

    SciTech Connect (OSTI)

    Shi, Xiaoyan; Yu, Wenlong; Hawkins, Samuel D.; Klem, John F.; Pan, Wei

    2015-08-04

    We fabricated a superconductor (Ta)-InAs/GaSb bilayer-superconductor (Ta) junction device that has a long mean free path and can preserve the wavelike properties of particles (electrons and holes) inside the junction. Differential conductance measurements were also carried out at low temperatures in this device, and McMillan-Rowell like oscillations (MROs) were observed. A much larger Fermi velocity, compared to that from Shubnikov-de Haas oscillations, was obtained from the frequency of MROs. Possible mechanisms are discussed for this discrepancy.

  11. Project Profile: Engineering a Novel High Temperature Metal Hydride

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

    Thermochemical Storage | Department of Energy Project Profile: Engineering a Novel High Temperature Metal Hydride Thermochemical Storage Project Profile: Engineering a Novel High Temperature Metal Hydride Thermochemical Storage PNNL Logo Pacific Northwest National Lab (PNNL), through the Concentrating Solar Power: Efficiently Leveraging Equilibrium Mechanisms for Engineering New Thermochemical Storage (CSP: ELEMENTS) funding program, is developing a concept for high energy density

  12. Permanent magnet with MgB{sub 2} bulk superconductor

    SciTech Connect (OSTI)

    Yamamoto, Akiyasu; Ishihara, Atsushi; Tomita, Masaru; Kishio, Kohji

    2014-07-21

    Superconductors with persistent zero-resistance currents serve as permanent magnets for high-field applications requiring a strong and stable magnetic field, such as magnetic resonance imaging. The recent global helium shortage has quickened research into high-temperature superconductors (HTSs)—materials that can be used without conventional liquid-helium cooling to 4.2 K. Herein, we demonstrate that 40-K-class metallic HTS magnesium diboride (MgB{sub 2}) makes an excellent permanent bulk magnet, maintaining 3 T at 20 K for 1 week with an extremely high stability (<0.1 ppm/h). The magnetic field trapped in this magnet is uniformly distributed, as for single-crystalline neodymium-iron-boron. Magnetic hysteresis loop of the MgB{sub 2} permanent bulk magnet was determined. Because MgB{sub 2} is a simple-binary-line compound that does not contain rare-earth metals, polycrystalline bulk material can be industrially fabricated at low cost and with high yield to serve as strong magnets that are compatible with conventional compact cryocoolers, making MgB{sub 2} bulks promising for the next generation of Tesla-class permanent-magnet applications.

  13. New Membranes for High Temperature Proton Exchange Membrane Fuel Cells

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

    Based on Heteropoly Acids | Department of Energy High Temperature Proton Exchange Membrane Fuel Cells Based on Heteropoly Acids New Membranes for High Temperature Proton Exchange Membrane Fuel Cells Based on Heteropoly Acids "Summary of Colorado School of Mines heteropolyacid research presented to the High Temperature Membrane Working Group Meeting, Orlando FL, October 17, 2003 " htwgf_fall2003.pdf (4.98 MB) More Documents & Publications Novel Approaches to Immobilized

  14. New Polyelectrolyte Materials for High Temperature Fuel Cells | Department

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

    of Energy Polyelectrolyte Materials for High Temperature Fuel Cells New Polyelectrolyte Materials for High Temperature Fuel Cells Part of a $100 million fuel cell award announced by DOE Secretary Bodman on Oct. 25, 2006. 1_lbnl.pdf (20.59 KB) More Documents & Publications Polyelectrolyte Materials for High Temperature Fuel Cells Nitrided Metallic Bipolar Plates Durable Low Cost Improved Fuel Cell Membranes

  15. Aerogel-Based Insulation for High-Temperature Industrial Processes

    Office of Scientific and Technical Information (OSTI)

    (Technical Report) | SciTech Connect Aerogel-Based Insulation for High-Temperature Industrial Processes Citation Details In-Document Search Title: Aerogel-Based Insulation for High-Temperature Industrial Processes Under this program, Aspen Aerogels has developed an industrial insulation called Pyrogel HT, which is 4-5 times more thermally efficient than current non-aerogel technology. Derived from nanoporous silica aerogels, Pyrogel HT was specifically developed to address a high temperature

  16. High temperature interfacial superconductivity (Patent) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Patent: High temperature interfacial superconductivity Citation Details In-Document Search Title: High temperature interfacial superconductivity High-temperature superconductivity confined to nanometer-scale interfaces has been a long standing goal because of potential applications in electronic devices. The spontaneous formation of a superconducting interface in bilayers consisting of an insulator (La.sub.2CuO.sub.4) and a metal (La.sub.1-xSr.sub.xCuO.sub.4), neither of which is superconducting

  17. 2006 High Temperature Membrane Working Group Meeting Archives | Department

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

    of Energy 6 High Temperature Membrane Working Group Meeting Archives 2006 High Temperature Membrane Working Group Meeting Archives View 2006 meeting presentations from the High Temperature Membrane Working Group. September 14, 2006, San Francisco, California Agenda Minutes Discussion Overview, James Fenton, University of Central Florida Membrane Performance and Durability Overview for Automotive Fuel Cell Applications, Tom Greszler, GM Measuring Physical Properties of Polymer Electrolyte

  18. 2007 High Temperature Membrane Working Group Meeting Archives | Department

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

    of Energy 7 High Temperature Membrane Working Group Meeting Archives 2007 High Temperature Membrane Working Group Meeting Archives View 2007 meeting presentations from the High Temperature Membrane Working Group. October 10, 2007, Washington, D.C. This meeting was held in conjunction with the Electrochemical Society's fall meeting. Meeting Agenda Meeting Minutes Structure and Dynamics of Polymer Nanocomposites by Grazing-Incidence X-Ray Techniques, Jin Wang, Argonne National Laboratory

  19. 2009 High Temperature Membrane Working Group Meeting Archives | Department

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

    of Energy 9 High Temperature Membrane Working Group Meeting Archives 2009 High Temperature Membrane Working Group Meeting Archives View information from meetings of the High Temperature Membrane Working Group held in 2009. November 16, 2009, Palm Springs, California This meeting was held in conjunction with the Fuel Cell Seminar. Minutes U.S. Fuel Cell Council: The Voice of the Fuel Cell Industry Membrane Requirements for Back-up Power Applications, Michael Hicks, IdaTech GenSys Blue: Fuel

  20. 2010 High Temperature Membrane Working Group Meeting Archives | Department

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

    of Energy 10 High Temperature Membrane Working Group Meeting Archives 2010 High Temperature Membrane Working Group Meeting Archives View information from meetings of the High Temperature Membrane Working Group held in 2010. October 14, 2010, Las Vegas, Nevada Minutes Continuum Modeling of Membrane Properties, Ahmet Kusoglu and Adam Z. Weber, Lawrence Berkeley National Laboratory Some Durability Considerations for Proton Exchange Membranes, Steven Hamrock, 3M Fuel Cell Components Program

  1. Alternative Refrigerant Evaluation for High-Ambient-Temperature

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

    Environments: R-22 and R-410A Alternatives for Mini-Split Air Conditioners | Department of Energy Alternative Refrigerant Evaluation for High-Ambient-Temperature Environments: R-22 and R-410A Alternatives for Mini-Split Air Conditioners Alternative Refrigerant Evaluation for High-Ambient-Temperature Environments: R-22 and R-410A Alternatives for Mini-Split Air Conditioners The Oak Ridge National Laboratory High-Ambient-Temperature Evaluation Program for Low Global Warming Potential (Low-GWP)

  2. Minutes of the Fall 2009 High Temperature Membrane Working Group |

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

    Department of Energy Fall 2009 High Temperature Membrane Working Group Minutes of the Fall 2009 High Temperature Membrane Working Group Minutes of the Fall 2009 High Temperature Membrane Working Group, November 16, 2009 htmwg_nov09_minutes.pdf (41.2 KB) More Documents & Publications GenSys Blue: Fuel Cell Heating Appliance 2009 Fuel Cell Market Report 2008 Fuel Cell Technologies Market Report

  3. Lead Research and Development Activity for High Temperature, Low Relative

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

    Humidity Membrane Program | Department of Energy Lead Research and Development Activity for High Temperature, Low Relative Humidity Membrane Program Lead Research and Development Activity for High Temperature, Low Relative Humidity Membrane Program A presentation to the High Temperature Membranes Working Group meeting, May 19, 2006. fenton.pdf (448.4 KB) More Documents & Publications Discussion Overview In Plane Conductivity Testing, BekkTech LLC Progress and Status on Through-Plane

  4. High Temperature Membrane Working Group, Minutes of Meeting on September

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

    14, 2006 | Department of Energy Group, Minutes of Meeting on September 14, 2006 High Temperature Membrane Working Group, Minutes of Meeting on September 14, 2006 These meeting minutes provide information about the High Temperature Membrane Working Group meeting on September 14, 2006 in San Francisco, Ca. htmwg_sept06_minutes.pdf (205.28 KB) More Documents & Publications Membrane Performance and Durability Overview for Automotive Fuel Cell Applications Discussion Overview High Temperature

  5. First high-temperature electronics products survey 2005.

    SciTech Connect (OSTI)

    Normann, Randy Allen

    2006-04-01

    On April 4-5, 2005, a High-Temperature Electronics Products Workshop was held. This workshop engaged a number of governmental and private industry organizations sharing a common interest in the development of commercially available, high-temperature electronics. One of the outcomes of this meeting was an agreement to conduct an industry survey of high-temperature applications. This report covers the basic results of this survey.

  6. Apparatus for monitoring high temperature ultrasonic characterization

    DOE Patents [OSTI]

    Lanagan, Michael T.; Kupperman, David S.; Yaconi, George A.

    1998-01-01

    A method and an apparatus for nondestructive detecting and evaluating chas in the microstructural properties of a material by employing one or more magnetostrictive transducers linked to the material by means of one or more sonic signal conductors. The magnetostrictive transducer or transducers are connected to a pulser/receiver which in turn is connected to an oscilloscope. The oscilloscope is connected to a computer which employs an algorithm to evaluate changes in the velocity of a signal transmitted to the material sample as function of time and temperature.

  7. Apparatus for monitoring high temperature ultrasonic characterization

    DOE Patents [OSTI]

    Lanagan, M.T.; Kupperman, D.S.; Yaconi, G.A.

    1998-03-24

    A method and an apparatus for nondestructive detecting and evaluating changes in the microstructural properties of a material by employing one or more magnetostrictive transducers linked to the material by means of one or more sonic signal conductors. The magnetostrictive transducer or transducers are connected to a pulser/receiver which in turn is connected to an oscilloscope. The oscilloscope is connected to a computer which employs an algorithm to evaluate changes in the velocity of a signal transmitted to the material sample as function of time and temperature. 6 figs.

  8. High temperature solid oxide fuel development activities

    SciTech Connect (OSTI)

    Ray, E.R.

    1993-11-01

    This paper presents an overview of the Westinghouse tubular SOFC development activities and current program status. Goal is to develop a cell that can operate for 50,000 to 100,000 h. Test results are presented for multiple single cell tests which have now successfully exceeded 40,000 hours of continuous power operation at temperature. Two 25-kW SOFC customer tests units were delivered in 1992; a 20-kW SOFC system is bein manufactured and will be operated by Southern California Edison in 1995. Megawatt class generators are being developed.

  9. Aerogel-Based Insulation for High-Temperature Industrial Processes...

    Office of Scientific and Technical Information (OSTI)

    Aerogel-Based Insulation for High-Temperature Industrial Processes Dr. Owen Evans 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; COMPETITION; ENERGY CONSUMPTION; MARKET;...

  10. High Temperature Gas Reactors: Assessment of Applicable Codes...

    Office of Scientific and Technical Information (OSTI)

    Technical Report: High Temperature Gas Reactors: Assessment of Applicable Codes and ... applicable to HTGR plants, the operating history of past and present HTGR plants, and with ...

  11. Apparatus for preventing high temperatures in a glazed solar collector

    DOE Patents [OSTI]

    Buckley, Bruce S.

    1979-01-01

    Venting the glazing (i.e., transparent cover) of a solar collector can be used to prevent the collector's absorber surface from reaching too high a temperature.

  12. High-Temperature Downhole Tools | Open Energy Information

    Open Energy Info (EERE)

    and Analysis of Geothermal Technologies Albuquerque, NM 941,000 941,000 Feasibility and Design for a High-Temperature Downhole Tool Tennessee Oak Ridge National...

  13. High Temperature Thin Film Polymer Dielectric Based Capacitors...

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

    Thin Film Polymer Dielectric Based Capacitors for HEV Power Electronic Systems High Temperature Thin Film Polymer Dielectric Based Capacitors for HEV Power Electronic Systems 2009 ...

  14. Alternative Refrigerant Evaluation for High-Ambient-Temperature...

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

    The Oak Ridge National Laboratory High-Ambient-Temperature Evaluation Program for Low Global Warming Potential (Low-GWP) Refrigerants project was aimed to develop an understanding ...

  15. Overview of Fraunhofer IPM Activities in High Temperature Bulk...

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

    Fraunhofer IPM, new funding situation in Germany, high temperature material and modules, ... Programme 7 and additional activities in Germany Standardization of Transport Properties ...

  16. Microchannel High-Temperature Recuperator for Fuel Cell Systems

    SciTech Connect (OSTI)

    2010-02-01

    This factsheet describes a research project whose goal is to build an efficient, microchannel-based waste heat recuperator for a high-temperature fuel cell system.

  17. Deep Burn: Development of Transuranic Fuel for High-Temperature...

    Office of Scientific and Technical Information (OSTI)

    discusses: (1) Core and Fuel Analysis; (2) Spent Fuel Management; (3) Fuel Cycle Integration of the HTR (high temperature helium-cooled reactor); (4) TRU (transuranic elements) ...

  18. High-Speed, Temperature Programmable Gas Chromatography Utilizing...

    Office of Scientific and Technical Information (OSTI)

    High-Speed, Temperature Programmable Gas Chromatography Utilizing a Microfabricated Chip ... Chromatography Utilizing a Microfabricated Chip with an Improved Carbon Nanotube ...

  19. Detecting Fractures Using Technology at High Temperatures and...

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

    Fractures Using Technology at High Temperatures and Depths - Geothermal Ultrasonic Fracture Imager (GUFI); 2010 Geothermal Technology Program Peer Review Report Detecting Fractures ...

  20. High-Throughput Analytical Model to Evaluate Materials for Temperature...

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

    High-Throughput Analytical Model to Evaluate Materials for Temperature Swing Adsorption Processes Previous Next List mcontent.jpg Julian P. Sculley, Wolfgang M. Verdegaal, Weigang...

  1. 2006 DOE Hydrogen Program Dimensionally Stable High Temperature...

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

    More Documents & Publications High Temperature Membrane Working Group, Minutes of Meeting on September 14, 2006 Measuring Physical Properties of Polymer Electrolyte Membranes ...

  2. Project Profile: Advanced High Temperature Trough Collector Developmen...

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

    Project Profile: Advanced High Temperature Trough Collector Development Solar Millennium logo The Solar Millennium Group and its subsidiary Flagsol, under the CSP R&D FOA, are ...

  3. Materials and Process Design for High-Temperature Carburizing...

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

    Materials and Process Design for High-Temperature Carburizing Materials and Process Design ... Case hardening would enable major productivity gains in the forging, forming, and die ...

  4. Project Profile: High-Temperature Solar Selective Coating Development...

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

    Solar Selective Coating Development for Power Tower Receivers Project Profile: High-Temperature Solar Selective Coating Development for Power Tower Receivers Sandia National ...

  5. Enhanced High Temperature Performance of NOx Storage/Reduction...

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

    (LNT) Materials Enhanced High Temperature Performance of NOx StorageReduction (NSR) Materials Deactivation Mechanisms of Base MetalZeolite Urea Selective Catalytic Reduction...

  6. Feasibility and Design Studies for a High Temperature Downhole Tool

    Broader source: Energy.gov [DOE]

    Project objective: Perform feasibility and design studies for a high temperature downhole tool; which uses nuclear techniques for characterization purposes; using measurements and modeling/simulation.

  7. Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion...

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

    Energy Conversion for Efficient Waste Heat Recovery Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion for Efficient Automotive Waste Heat Recovery ...

  8. High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells

    Broader source: Energy.gov [DOE]

    DOE Geothermal Peer Review 2010 - Presentation. Project objectives: Design, demonstrate, and qualify high-temperature high pressure zonal isolation devices compatible with the high temperature downhole Enhanced Geothermal Systems (EGS) environment.

  9. Comparative Assessment of Direct Drive High Temperature Superconducting Generators in Multi-Megawatt Class Wind Turbines

    SciTech Connect (OSTI)

    Maples, B.; Hand, M.; Musial, W.

    2010-10-01

    This paper summarizes the work completed under the CRADA between NREL and American Superconductor (AMSC). The CRADA combined NREL and AMSC resources to benchmark high temperature superconducting direct drive (HTSDD) generator technology by integrating the technologies into a conceptual wind turbine design, and comparing the design to geared drive and permanent magnet direct drive (PMDD) wind turbine configurations. Analysis was accomplished by upgrading the NREL Wind Turbine Design Cost and Scaling Model to represent geared and PMDD turbines at machine ratings up to 10 MW and then comparing cost and mass figures of AMSC's HTSDD wind turbine designs to theoretical geared and PMDD turbine designs at 3.1, 6, and 10 MW sizes. Based on the cost and performance data supplied by AMSC, HTSDD technology has good potential to compete successfully as an alternative technology to PMDD and geared technology turbines in the multi megawatt classes. In addition, data suggests the economics of HTSDD turbines improve with increasing size, although several uncertainties remain for all machines in the 6 to 10 MW class.

  10. Microsoft Word - Extreme Electron Correlation in the Strange Metal Phase of High

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

    October 2011 An exemplary fit of ARPES data using the ECFL theory. In this fit, the very wide energy of the data are fit including the rising background, thanks to the "caparison factor" of the ECFL theory. Extreme Electron Correlation in the Strange Metal Phase of High- temperature Superconductors High-temperature superconductors are known for their "strange metal phase," which presents a rich but strange set of phenomena that challenge understanding. A requirement for

  11. The high-pressure-high-temperature behavior of bassanite (Journal...

    Office of Scientific and Technical Information (OSTI)

    The room-temperature cell-volume data, from 0.001 to 33 GPa, were fitted to a third-order ... Sponsoring Org: USDOE Country of Publication: United States Language: ENGLISH Subject: 58 ...

  12. Advancing the technology base for high-temperature membranes

    SciTech Connect (OSTI)

    Dye, R.C.; Birdsell, S.A.; Snow, R.C.

    1997-10-01

    This is the final report of a two-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). This project addresses the major issues confronting the implementation of high-temperature membranes for separations and catalysis. We are pursuing high-temperature membrane systems that can have a large impact for DOE and be industrially relevant. A major obstacle for increased use of membranes is that most applications require the membrane material to withstand temperatures above those acceptable for polymer-based systems. Advances made by this project have helped industry and DOE move toward high-temperature membrane applications to improve overall energy efficiency.

  13. Apparatus for accurately measuring high temperatures

    DOE Patents [OSTI]

    Smith, Douglas D.

    1985-01-01

    The present invention is a thermometer used for measuring furnace temperaes in the range of about 1800.degree. to 2700.degree. C. The thermometer comprises a broadband multicolor thermal radiation sensor positioned to be in optical alignment with the end of a blackbody sight tube extending into the furnace. A valve-shutter arrangement is positioned between the radiation sensor and the sight tube and a chamber for containing a charge of high pressure gas is positioned between the valve-shutter arrangement and the radiation sensor. A momentary opening of the valve shutter arrangement allows a pulse of the high gas to purge the sight tube of air-borne thermal radiation contaminants which permits the radiation sensor to accurately measure the thermal radiation emanating from the end of the sight tube.

  14. Dynamics of high temperature plasmas. Final report

    SciTech Connect (OSTI)

    Dialetis, D.; Finn, J.; Freund, H.; Mondelli, A.; Ott, E.

    1985-10-01

    Contents include: envelope model for beam transport and focusing in an induction linac; high-current accelerators; free-electron laser studies; laser beat-wave particle acceleration; orbitron maser design; electron-beam stability in the modified betatron; relativistic electron beam diode design; free electron laser application to xuv production and particle acceleration; high-current betatron with stellarator fields; a bumpy-torus betatron; design and operation of a collective millimeter-wave free-electron laser; study of gain, bandwidth, and tunability of a millimeter-wave free-electron laser operating in the collective regime; nonlinear analysis of free-electron-laser amplifiers with axial guide fields; unstable electrostatic beam modes in free-electron-laser systems; three-dimensional theory of free electron lasers with an axial guide field; three-dimensional theory of the free-electron laser in the collective regime; rapid electron beam accelerators; excitation of the plasma waves in the laser beat wave accelerator; dynamics of space-charge waves in the laser beat wave accelerator; finite larmor radius diocotron instability; one dimensional models for relativistic electron beam diode design; collective instabilities and high-gain regime in a free electron laser; and free electron lasers for the xuv spectral region.

  15. Detecting Fractures Using Technology at High Temperatures and Depths -

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

    Geothermal Ultrasonic Fracture Imager (GUFI); 2010 Geothermal Technology Program Peer Review Report | Department of Energy Detecting Fractures Using Technology at High Temperatures and Depths - Geothermal Ultrasonic Fracture Imager (GUFI); 2010 Geothermal Technology Program Peer Review Report Detecting Fractures Using Technology at High Temperatures and Depths - Geothermal Ultrasonic Fracture Imager (GUFI); 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal

  16. High Temperature Evaluation of Tantalum Capacitors - Test 1

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Cieslewski, Grzegorz

    2014-09-28

    Tantalum capacitors can provide much higher capacitance at high-temperatures than the ceramic capacitors. This study evaluates selected tantalum capacitors at high temperatures to determine their suitability for you in geothermal field. This data set contains results of the first test where three different types of capacitors were evaluated at 260C.

  17. High Temperature Evaluation of Tantalum Capacitors - Test 1

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Cieslewski, Grzegorz

    Tantalum capacitors can provide much higher capacitance at high-temperatures than the ceramic capacitors. This study evaluates selected tantalum capacitors at high temperatures to determine their suitability for you in geothermal field. This data set contains results of the first test where three different types of capacitors were evaluated at 260C.

  18. Superconductivity Program Overview High-Temperature Superconductivity

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

    SuperconducTiviTy program haS Three FocuS areaS: SuperconducTiviTy applicaTionS Developing HTS-based electric power equipment such as transmission and distribution cables and fault current limiters Second-generaTion Wire developmenT Developing high-performance, low-cost, second- generation HTS wire at long lengths STraTegic reSearch Supporting fundamental research activities to better understand relationships between the microstructure of HTS materials and their ability to carry large electric

  19. The Progress on Low-Cost, High-Quality, High-Temperature Superconducting Tapes Deposited by the Combustion Chemical Vapor Deposition Process

    SciTech Connect (OSTI)

    Shoup, S.S.; White, M.K.; Krebs, S.L.; Darnell, N.; King, A.C.; Mattox, D.S.; Campbell, I.H.; Marken, K.R.; Hong, S.; Czabaj, B.; Paranthaman, M.; Christen, H.M.; Zhai, H.-Y. Specht, E.

    2008-06-24

    The innovative Combustion Chemical Vapor Deposition (CCVD) process is a non-vacuum technique that is being investigated to enable next generation products in several application areas including high-temperature superconductors (HTS). In combination with the Rolling Assisted Biaxially Textured Substrate (RABiTS) technology, the CCVD process has significant promise to provide low-cost, high-quality lengths of YBCO coated conductor. Over 100 meter lengths of both Ni and Ni-W (3 at. Wt.%) substrates with a surface roughness of 12-18 nm were produced. The CCVD technology has been used to deposit both buffer layer coatings as well as YBCO superconducting layers. Buffer layer architecture of strontium titanate (SrTiO{sub 3}) and ceria (CeO{sub 2}) have been deposited by CCVD on textured nickel substrates and optimized to appropriate thicknesses and microstructures to provide templates for growing PLD YBCO with a J{sub c} of 1.1 MA/cm{sup 2} at 77 K and self-field. The CCVD buffer layers have been scaled to meter plus lengths with good epitaxial uniformity along the length. A short sample cut from one of the lengths enabled high critical current density PLD YBCO. Films of CCVD YBCO superconductors have been grown on single crystal substrates with critical current densities over 1 MA/cm{sup 2}. In addition, superconducting YBCO films with an I{sub c} of 60 A/cm-width (J{sub c} = 1.5 MA/cm{sup 2}) were grown on ORNL RABiTS (CeO{sub 2}/YSZ/Y{sub 2}O{sub 3}/Ni/Ni-3W) using CCVD process.

  20. Thermocouples For High Temperature In-Pile Testing

    SciTech Connect (OSTI)

    J. L. Rempe

    2005-11-01

    Many advanced nuclear reactor designs require new fuel, cladding and structural materials. Data are needed to characeterize the performance of these new materials in high temperature, oxidizing and radiation conditions. To obtain this data, robust instrumentation is needed htat can survive proposed test conditions. Traditional methods for measuring temperature in-pile degrade at temperatures above 1080 degrees C. Hence, a project was intiated to develop specialized thermocouples for high temperature in-pile applications (see Rempe and Wilkins, 2005). This paper summarizes efforts to develop, fabricate and evaluate these specialized thermocouples.