Abstract
Compounds of the system, Tl1−xBixBa2Ca2Cu3O9, were synthesized and studied. Bi substitutes at the Tl-site for values of x up to x=0.2. The superconducting transition temperature, Tc, increases from 110K for x=0.0 to 116K for x=0.2. SEM images reveal a plate-like morphology which is highly suitable for powder-in-tube processing. M-H loops show that the Bi-substituted phase has significantly better low temperature flux pinning properties than the pristine Tl-cuprate, and exhibits only a weak dependence on temperature and field when compared to that of unsubstituted phase. The Jc values calculated using the Bean model are: 3 × 107 A/cm2 at 10K,1T and 2 × 104 A/cm2 at 77K.1T. Substitution of 20% of Bi in TlBa2Ca2Cu3O9 makes the compound an excellent choice for magnet wire applications at relatively low temperatures.
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Badri, V., Wang, Y. & Hermann, A. Enhanced Superconductivity in the Tl1−XBiXBa2Ca2Cu3Oy System. Journal of Superconductivity 11, 91–94 (1998). https://doi.org/10.1023/A:1022654501377
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DOI: https://doi.org/10.1023/A:1022654501377