Effect of (CuPb)‎ x substitution on Tc of Bi2-x (CuPb)‎ x Sr2Ca2Cu3O10+δ superconductors

الملخص EN

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 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.