THE THEORETICAL STUDY OF SUPERCONDUCTIVITY IN OXIDE BaPb_1-xBi_xO₃

A local Hamiltonian is introduced to study BaPb_1-xBi_xO₃. The usual CPA method is used to deal with the substitutional disorder effect. The superconducting T_c ~ x relation is calculated and the result is in agreement with experiments. Some remarks on the characteristics of oxide superconductivity are presented.