Author
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) 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.
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