PREPARATION OF THE TEXTURED BI-BASED OXIDE TAPES BY PARTIAL MELTING PROCESS

被引：127

作者：

KASE, J ^{[1
]}

MORIMOTO, T ^{[1
]}

TOGANO, K ^{[1
]}

KUMAKURA, H ^{[1
]}

DIETDERICH, DR ^{[1
]}

MAEDA, H ^{[1
]}

机构：

[1] NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期

关键词：

Bismuth Compounds - Superconductivity - Ceramic Materials - Superconductivity - Microscopic Examination - Scanning Electron Microscopy - Superconducting Materials - Microstructure - X-Rays - Diffraction;

D O I：

10.1109/20.133412

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Bi2Sr2Ca1Cu2O(x) textured tapes with an excellent J(c) were prepared by doctor-blade casting and a partial melt process. A green tape, composed of Bi2Sr2Ca1Cu2O(x) powder and organic formulation was laid on a silver foil and heat treated. A highly textured microstructure was formed during slow cooling between 890-degrees-C and 870-degrees-C. XRD and SEM observation indicated that initially an oriented Bi2Sr2Cu1O(x) structure forms by growth from the melt and its subsequently transforms to the Bi2Sr2Ca1Cu2O(x) phase. A grain alignment was significantry enhanced in oxide layer with a thickness less than 20-mu-m. Silver dissolved in the oxide from substrate also plays an important role for the grain alignment, by lowering the melting point of the oxide. The T(c) of a tape could be increased to 89K by quenching from 870-degrees-C. The J(c) was 1.3 X 10(4) A/cm2 at 77K, OT and 1.4 X 10(5) A/cm2 at 4.2K in a high magnetic field of 25T.

引用

页码：1254 / 1257

页数：4

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