Bushra Salman Mahdi
Abstract
High temperature superconductors with a nominal composition Bi2-x (CuPb) xSr2Ca2Cu3O10+δ for (0≤x≤0.5) were prepared by solid state reaction method. The effect of (CuPb) ...
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High temperature superconductors with a nominal composition Bi2-x (CuPb) xSr2Ca2Cu3O10+δ for (0≤x≤0.5) were prepared by solid state reaction method. The effect of (CuPb) x substitution on Tc of Bi2-x(CuPb)xSr2Ca2Cu3O10+δ compound has been investigated by X-ray diffraction , resistance measurements and oxygen content to obtain the optimum conditions for the formation and stabilization of the high TC phase (2223- phase).The results showed that the optimum sintering temperature for the composition Bi2-x(CuPb)xSr2Ca2Cu3O10+δ is Ts=1133K for ts=140h. The x-ray diffraction (XRD) analysis showed that all the samples have almost two phases: high-Tc phase (2223- phase) and low-TC phase (2212- phase). It was found that all the samples having an orthorhombic structure with lattice parameter value (c) increased with increasing of the critical temperature Tc. Substitution of (CuPb)x to 0.1, 0.3, 0.4 increases the transition temperature to TC=107K, 125K, 95K, respectively.
