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  1. No Access

    Article

    Microscopic Study of Metal Hydrides Using Electron Spin Resonance

    Electron spin resonance (ESR) of dilute paramagnetic ions in nonmagnetic metallic hydrides provides microscopic information about the hydrogen ions in the immediate vicinity of the impurity. By comparing ESR s...

    E. L. Venturini in MRS Online Proceedings Library (2011)

  2. No Access

    Article

    Stability of Tl–Ba–Ca–Cu–O superconducting thin films

    We report the stability of TlBa2CaCu2O7 and Tl2Ba2CaCu2O8 on LaAlO3(100) epitaxial thin films, under a variety of conditions. All films are stable in acetone and methanol and with repeated thermal cycling to cryo...

    M. P. Siegal, D. L. Overmyer, E. L. Venturini… in Journal of Materials Research (1999)

  3. No Access

    Article

    A new hybrid two-zone/crucible furnace process for the growth of epitaxial Tl2Ba2CaCu2O8 superconducting films

    Epitaxial Tl2Ba2CaCu2O8 (Tl-2212) films ∼5500 Å thick are grown on LaAlO3(100) substrates using a new hybrid two-zone/crucible furnace process enabling precise control of thallination. This method combines the be...

    M. P. Siegal, D. L. Overmyer, E. L. Venturini… in Journal of Materials Research (1998)

  4. No Access

    Article

    Growth and Characterization of TlBaCaCuO Thin Films

    We discuss two methods tor the ex-situ furnace growth of pure TIBaCaCuO superconducting thin films on LaAlO3(100) substrates. The traditional approach of “crucible processing” is used to grow high-quality films o...

    M. P. Siegal, E. L. Venturini, D. L. Overmyer… in Journal of Superconductivity (1998)

  5. No Access

    Article

    Correlation of Intermediate Ion Energy Induced Extended Defect Continuity to Enhanced Pinning Potential in Tl-2212 Films

    Lattice defects are introduced into the structure to suppress the motion of magnetic vortices and enhance the critical current density in high temperature superconductors. Point defects are not very effective ...

    P. Newcomer Provencio, E. L. Venturini, B. L. Doyle… in MRS Online Proceedings Library (1997)

  6. No Access

    Article

    Synthesis and properties of Tl–Ba–Ca–Cu–O superconductors

    We review the synthesis methods and properties of single crystal, powder, and thin film TlBaCaCuO high-temperature superconducting (Tl-HTS) materials. With transition temperatures ≥ 100 K for several compounds...

    M. P. Siegal, E. L. Venturini, B. Morosin, T. L. Aselage in Journal of Materials Research (1997)

  7. No Access

    Article

    HRTEM of Extended Defects in TL-2212 Thin Films

    Many applications of high temperature superconductors, HTS, require the presence of lattice defects in the material structure to suppress the motion of magnetic vortices and enhance the critical current densit...

    P. P. Newcomer, E. L. Venturini, H. Schöne, B. L. Doyle… in MRS Online Proceedings Library (1996)

  8. No Access

    Article

    Stability of the Tl-1223 phases

    The thermodynamic stability of TlBa2Ca2Cu3O9–y (1223) and substitutionally related phases has been studied by performing extended high-temperature anneals in a two-zone furnace. This approach allows for independe...

    T. L. Aselage, E. L. Venturini, J. A. Voigt, D. J. Miller in Journal of Materials Research (1996)

  9. No Access

    Article

    Magnetic Properties of Nanosize Iron Clusters

    Isolated, monodisperse α-Fe clusters between 1.4 and 15 nm in diameter were prepared inside inverse micelles using an oil-continuous, nonaqueous system. The magnetic properties of these clusters were studied i...

    E. L. Venturini, J. P. Wilcoxon, P. P. Newcomer in MRS Online Proceedings Library (1994)

  10. No Access

    Article

    Two-zone annealing of Tl0.5Pb0.5(Sr0.8Ba0.2)2Ca2Cu3Oy

    Stable conditions have been identified for two-zone processing of the superconducting thallium cuprate Tl0.5Pb0.5(Sr0.8Ba0.2)2Ca2Cu3Oy. With P(O2) of 0.8 atm, P(Tl2O) of 4.4 × 10−3 atm, and a sample temperature o...

    T. L. Aselage, E. L. Venturini, J. A. Voigt, D. L. Lamppa… in Journal of Materials Research (1994)

  11. No Access

    Article

    Structural studies on Tl–Ca–Ba–Cu−0 superconducting thin films

    The microstructure of mixed phase, c-axis oriented Tl–Ca–Ba–Cu–O thin films, exhibiting excellent superconducting properties, has been examined by transmission electron microscopy and x-ray diffraction. Although ...

    Bruno Morosin, Grant M. Norton, Barry C. Carter… in Journal of Materials Research (1993)

  12. No Access

    Article

    Tl-Based Films: A Comparison of Processing Procedures

    The structural, electrical and magnetic properties are compared for three superconducting Tl-Ca-Ba-Cu-O thin films prepared by different deposition and sintering protocols. One film containing a mixture of Tl2Ca2

    B. Morosin, E. L. Venturini, C. P. Tigges, D. S. Ginley… in MRS Online Proceedings Library (1992)

  13. No Access

    Article

    Rapid Thermal Processing Of High Temperature Superconducting Fiber

    We report on the rapid thermal processing (RTP) of YBa2Cu3O7 (Y-123) fibers. Unsintered fibers are densified by RTP. We show that fibers which were originally semiconducting and tetragonal before RTP form normal ...

    J. W. Halloran, M. J. Neal, D. S. Ginley, E. L. Venturini… in MRS Online Proceedings Library (1990)

  14. No Access

    Chapter

    Flux Motion Effects in Tl-Ca-Ba-Cu-O Thin Films

    Flux motion effects, flow and creep, have been identified as one of the major problem areas in high temperature superconductors. In this paper, we examine these effects in polycrystalline thin films of the Tl-...

    C. P. Tigges, E. L. Venturini, D. S. Ginley… in Science and Technology of Thin Film Superc… (1990)

  15. No Access

    Article

    Annealing and Strain Effects on Tl-Ba-Ca-Cu-O Crystals and Ceramics

    Superconducting transition temperatures (Tc’S) in the Tl-Ba-Ca-Cu-O system are shown to be a function of processing for both single crystals and bulk ceramics. Crystals with the identical structural phase and nom...

    E. L. Venturini, B. Morosin, D. S. Ginley, J. F. Kwak… in MRS Online Proceedings Library (1989)

  16. No Access

    Article

    Cation Disordering in the Tl-2122 Superconductors

    We have examined several crystals belonging to the Tl-2122 structure type (Tl2CaBa2Cu2O8 with c=29Å), and have shown that cation solid solution occurs. Such cation disorder appears to be responsible for the obser...

    B. Morosin, D. S. Ginley, E. L. Venturini, R. J. Baughman… in MRS Online Proceedings Library (1989)

  17. No Access

    Article

    Superconductivity and Stoichiometry in Tl2Ca2Ba2Cu3Ox Single Crystals

    Magnetization and resistivity data are presented which show a substantial difference in superconducting transitions for nominal Tl2Ca2Ba2Cu3Ox plates with identical crystal structures grown from two different “me...

    E. L. Venturini, C. P. Tigges, R. J. Baughman… in MRS Online Proceedings Library (1989)

  18. No Access

    Article

    Ion-Irradiation Effects in Tl2Ca2Ba2Cu3010 Superconductors

    The effects of oxygen and helium ion irradiation on the superconducting properties of Tl2Ca2Ba2Cu3010 thin films were investigated. The transition temperature and width were monitored as a function of ion fluence...

    J. C. Barbour, J. F. Kwak, E. L. Venturini, D. S. Ginley… in MRS Online Proceedings Library (1989)

  19. No Access

    Article

    Novel Processing of Hts Based Conductors

    Conductor development is one of the major long term goals in high temperature superconductor research. In this paper we report on two promising processing technologies that have been utilized to produce superc...

    D. S. Ginley, E. L. Venturini, J. F. Kwak, R. J. Baughman… in MRS Online Proceedings Library (1989)

  20. No Access

    Article

    Freestanding thick films of YBa2Cu3O6.9 by screenprinting techniques

    Thick (20–300 μm) freestanding polycrystalline films of ceramic YBa2Cu3O6.9 have been obtained by resintering YBa2Cu3O6.9 powder in air after screen printing onto fused silica substrates. An interfacial reaction ...

    D. S. Ginley, M. A. Mitchell, J. F. Kwak, E. L. Venturini… in Journal of Materials Research (1989)

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