MICROSTRUCTURES IN HIGH-TC BI(PB)-FAMILY-2212 SUPERCONDUCTORS AS REVEALED BY SCANNING AND TRANSMISSION ELECTRON-MICROSCOPY

被引:2
作者
HORIUCHI, S [1 ]
HIRASAKA, M [1 ]
TSUTSUMI, M [1 ]
KOSUDA, K [1 ]
SZERER, MY [1 ]
BENDOR, L [1 ]
机构
[1] HEBREW UNIV JERUSALEM,DEPT INORGAN & ANALYT CHEM,IL-91904 JERUSALEM,ISRAEL
关键词
MICROSTRUCTURE; HIGH-TC BI(PB)-2212 SUPERCONDUCTOR; SOL-GEL METHOD; SEM; TEM; POWDER XRD; EPMA; MAGNETIZATION; CRACK; AMORPHOUS SUBSTANCE; MODULATED STRUCTURE;
D O I
10.1002/jemt.1070300307
中图分类号
R602 [外科病理学、解剖学]; R32 [人体形态学];
学科分类号
100101 ;
摘要
Microstructures of Bi(Pb)-family 2212 superconductors, which were prepared by a sol-gel method with three different compositions, were examined mainly by scanning and transmission electron microscopy. The magnetization of the specimens strongly depends on the ratio between Bi and Pb content, while Tc is almost constant. In specimen 1, prepared with the nominal composition of Bi/Pb = 9/1, small grains of 2212 phase are formed with a minor fraction of some impurity phases. In specimen 2, with Bi/Pb = 17/3, which is optimum from the viewpoint of magnetization, large grains of the 2212 phase are formed during heating at 800 degrees C, also with the impurity phases. In specimen 3, with Bi/Pb = 8/2, the 2212 grains are divided by layers of(Bi,,,, Pb-0.14) (Ca-0.7, Sr-0.3)O-x. Moreover, plate-like 2212 crystals are severely bent so that small cracks appear often with an inclusion of amorphous substance being rich in Ca and Pb. These layers and cracks must degrade the magnetization. A modulated structure of Bi-type is formed in the 2212 grains of specimens 1 and 2, while not only Bi-type but also Pb-type are formed in specimen 3. The wavelength of Pi-type is different for each specimen. (C) 1995 Wiley-Liss, Inc.
引用
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页码:258 / 264
页数:7
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