Effects of Synthesis Conditions on the Properties of a Superconducting Bi-Sr-Ca-Cu-O System

1 April 1988

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 27 (4A) , L548
https://doi.org/10.1143/jjap.27.l548

Abstract

With the aim of preparing a single, high-T _c phase in the Bi-Sr-Ca-Cu-O system, optimization of the composition and heat treatment have been studied. It was found that the temperature range at which the high-T _c phase forms, was very narrow (865–880°C) and a process of furnace-cooling was required to reduce a residual resistance due to the low-T _c phase. The high-T _c phase in this oxide system can easily form from a limited starting composition around Bi₁Sr₁Ca₁Cu₂O_x. T _c values for the high-T _c phase do not change much from the initial composition or the heat treatment, while that for the low-T _c phase moves considerably from about 88 K down to below 20 K. Existence of new superconducting phases in the Sr-Ca-Cu-O system is mentioned.

Keywords

This publication has 2 references indexed in Scilit:

An X-Ray Diffraction and Electron Microscopic Study of a New High-T_c Superconductor based on the Bi-Ca-Sr-Cu-O System
Japanese Journal of Applied Physics, 1988
A New High-T_c Oxide Superconductor without a Rare Earth Element
Japanese Journal of Applied Physics, 1988