PREPARATION AND FORMATION OF HIGH-T_c PHASE IN Bi_2−xPb_xSr₂Ca₂Cu₃O_y SYSTEM

Abstract

With the aim of preparing a single, high-T c phase in the Bi 2−x Pb x Sr 2 Ca 2 Cu 3 O y system, optimization of the composition and heat treatment have been studied. It was found that the composition at which the more high-T c phase forms, was x=0.4 and in condition (3). For sample 3 (x=0.4), specific heat anomaly indicates that the superconductivity of high-T c phase was bulk phenomenon. This means there is more volume fraction of high-T c phase in this sample.