PREPARATION OF HIGH-TC (110K) BI-SR-CA-CU-O SUPERCONDUCTORS FROM AMORPHOUS FILMS BY RAPID QUENCHING AFTER RAPID MELTING

被引：9

作者：

YOSHIMURA, M

SUNG, TH

NAKAGAWA, ZE

NAKAMURA, T

机构：

[1] Tokyo Inst of Technology, Japan

来源：

JOURNAL OF MATERIALS SCIENCE LETTERS | 1989年 / 8卷 / 06期

关键词：

Bismuth Compounds--Amorphous - Ceramic Materials--Amorphous - Copper Oxide--Amorphous - Electric Conductivity - X-Ray Analysis;

D O I：

10.1007/BF01730443

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The authors report the rapid quenching after rapid melting (RQRM method) of Bi2Sr2Ca2Cu3Ox and crystallization of the high-Tc (110 K) phase from the amorphous film. The film was heated under various conditions and examined by thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffraction, scanning electron microscopy and measurement of resistivity. The film consists of an amorphous phase showing haloes at 2θ = 20, 30 and 50°. A small amount of CaO crystallized in the sample. Reheating yielded polycrystalline products. The film specimen reheated at 1153 K in air for 1 h showed metallic conduction at room temperature and a two-step superconducting transition at 111 and 90 K. Longer periods or higher temperatures in reheating did not result in the formation of the pure high-Tc (110 K) phase.

引用

页码：687 / 688

页数：2