Temperature Dependence of Electrical Resistivity for pure and Ag Doped Bi-Pb-Sr-Ca-Cu-O Superconductor
Dr. Pawan Kumar
Associate Prof., Department of Physics, A.S. (P.G.) College,Sikandrabad, U.P., India.
The temperature dependent resistance of pure and Ag doped Bi-Pb-Sr-Ca-Cu-O has been observed. It has been found that Ag additions to Bi-Pb-Sr-Ca-Cu-O depress Tc and Jc drestically and cause a large decrease in lattice parameters when samples are treated in air or pure oxygen. However, the lattice parameters Tc and Jc remain unaffected by Ag additions when samples heated in 0.030-0.067 atm oxygen. It is clear that the Ag reacts with and destabilises the superconducting phase when the samples are treated in air or pure oxygen while, when the samples are heated in low oxygen partial pressures, the Ag remains as an isolated inert metal phase that improves the week links between the grains.
Keywords: Electrical Resistivity, ceramics, superconductivity.
