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  • 1
    Electronic Resource
    Electronic Resource
    (Tl, Pb, Bi)Sr2Ca2Cu3Oz superconductors with zero resistance at 120 K (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1281-1283 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have synthesized new superconductors of nearly single phase with zero-resistance temperatures around 120 K employing a novel method for sintering. The samples included a nominal composition of (Tl0.64Pb0.2Bi0.16)Sr2Ca3Cu4Oz. This sample was prepared from the mixture of presynthesized (Tl0.64Pb0.2Bi0.16)Sr2CaCu2Oz (1212 phase), CaO, and CuO powders. The mixed powder was sintered at 920 °C in O2 gas and post-annealed at 400–600 °C in O2 gas. The powder x-ray diffraction revealed that the sample was isostructural with the Tl-based (Tl, Pb, Bi)Sr2Ca2Cu3Oz (1223 phase). The sample exhibited a sharp superconducting transition at Tonsetc=125 K and TR=0c=120 K and the superconducting diamagnetic signal at 10 K was about 20% of a full Meissner effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103174
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of Tl-based "2234'' superconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2347-2350 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nearly single-phase samples of superconducting Tl–Ba–Ca–Cu–O "2234'' were successfully synthesized. The sample sintered in air had Tc of 112 K. Post-annealing of the sintered sample in a high-pressure oxygen gas made its Tc increase up to 115 K. The sample sintered in argon gas had Tc of 90 K. The thermoelectric power (TEP) of the sample was also measured. All the samples showed positive TEP signals. The magnitude of TEP signal decreased as Tc increased. Thus, it was likely that the as-sintered 2234 phase was in an under-doped state with respect to the optimum carrier concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351087
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    Paper (German National Licenses)
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