A Study on Oxide Superconductor Bi-Sr-Ca-Cu-O System Prepared by Oxalate Coprecipitation Method

Abstract

The oxalate coprecipitation method was applied to the preparation of a new high-T_c superconductor BiSrCaCu₂O_x and crystalline phases obtained by heat treatment were studied in connection with superconducting preperties. The pyrolysis of the coprecipitates was completed below 500°C and subsequent heat treatment above 800°C resulted in the formation of the layered structure characteristic to the superconducting phase. The particle shape was of thin flakes with the size of 10μm. The superconducting phase with T_c of 110K was formed by the heat treatment just below the melting point, which was enhanced in the melt - cooled sample.