FORMATION AND GROWTH MECHANISMS OF BI2SR2CACU2OY ON AN AG SUBSTRATE IN THE PARTIAL MELTING METHOD

被引：15
作者：
HASEGAWA, T [1 ]
KOBAYASHI, H [1 ]
KUMAKURA, H [1 ]
TOGANO, K [1 ]
机构：
[1] NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN
来源：
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1994年 / 7卷 / 08期
关键词：
D O I：
10.1088/0953-2048/7/8/008
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigated the phase changes of a Bi-Sr-Ca-Cu-O/Ag composite tape during cooling from a partially molten state using the high-temperature-x-ray-diffraction and oil-quenching techniques. In the cooling process, (SrCa)CuO2 and Bi(SrCa)2Oy appeared at the areas where the (SrCa)2CuO3 phase disappeared. At around 860-degrees-C, these solid phases melted into the liquid phase, and then Bi2Sr2CaCu2Oy (Bi-2212) grew rapidly at the surface. First, nucleation of Bi-2212 occurred at the surface of the liquid phase. With decreasing temperature the Bi-2212 crystal growth proceeded slowly from the surface to the inner area with the a-b plane almost parallel to the surface. During the growth of Bi-2212, excess Bi was ejected from Bi-2212, and a thin Bi-enriched layer was formed at the growth front of Bi-2212.
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页码：579 / 582
页数：4
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