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  • 1985-1989  (3)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Superconducting properties of powder metallurgically processed Ti-alloyed Nb3Sn microcomposites (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1937-1942 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CuNb3Sn microcomposite wires with Ti additions have been produced by the hot-powder-metallurgical preparation method. The influence of the Nb3Sn filament diameter, heat treatment, and Ti addition on the superconducting properties are discussed on the basis of critical current densities (up to fields of 22 T), critical temperatures, as well as x-ray microprobe analyses. Critical current measurements of Nb3Sn multifilamentary tapes indicate that filament/matrix interfaces are dominant flux pinning centers in these composites. When Ti is incorporated into the A15 phase, the upper critical field is enhanced by about 2 T with respect to unalloyed superconductors. A drastic improvement of the superconducting properties can be achieved by the utilization of larger Nb powder particles. In microcomposites prepared from larger Nb powder (100–300 μm), Bc2 is enhanced by about 3–4 T with respect to finer Nb powder (20–45 μm). Critical fields up to 21.4 T and critical current values of 1.2×104 A/cm2 at a magnetic field of 16 T and 4.5×103 A/cm2 at 18 T are obtained for microcomposites prepared from coarser Nb powder with an addition of 2 wt. % Ti.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339530
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stability limits of the perovskite structure in the Y-Ba-Cu-O system (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2148-2150 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The equilibrium (molecular) oxygen partial pressure of the Y1Ba2Cu3O7−x phase has been measured by an electrochemical method. The investigations are focused on the low-temperature range between 560 and 750 °C and on oxygen stoichiometries close to the oxygen-poor phase boundary. In particular, the oxygen partial pressure has been determined below which the perovskite structure becomes thermodynamically unstable. This critical value should be considered during the preparation of high Tc Y1Ba2Cu3O7−x superconductors, especially in the case of an in situ preparation of thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101513
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phase formation in mechanically alloyed Nb-Al powders (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1399-1401 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nb-Al alloys have been prepared by mechanical alloying of elemental crystalline powders and investigated with x-ray diffraction and transmission electron microscopy. Crystalline equilibrium phases form for Al-rich alloys. Amorphous phase formation is observed for the Nb50Al50 composition. Mechanically alloyed powders with more than 70 at. % Nb exhibit the metastable bcc (A2) solid solution which transforms after thermal annealing into the A15 phase. Formation of the different phases can be understood by considering the free-energy curves of the amorphous and bcc phases as calculated from the phase diagram and additional thermodynamic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99989
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    Paper (German National Licenses)
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