Domain structure and Y2BaCuO5 distribution in single- and multiple-domain melt-textured YBaCuO

被引：3
作者：
Diko, P
Todt, VR
Miller, DJ
Goretta, KC
机构：
[1] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439
[2] ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439
[3] ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439
来源：
SUPERLATTICES AND MICROSTRUCTURES | 1997年 / 21卷 / 03期
基金：
美国国家科学基金会;
关键词：
melt-grown YBaCuO; subgrains; Y2BaCuO5; segregation; grain boundaries;
D O I：
10.1006/spmi.1996.0409
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Microstructural features such as subgrains, Y2BaCuO5 particles, ana high-angle boundaries were studied in single- and multiple-domain melt-textured YBaCuO levitators. Subgrains elongated in the c- or a-direction and rectangular in cross section were formed during solidification by cellular growth. Formation of subgrains by combination of a- and c-growth was also observed. Their boundaries were predominantly low angle, and were not cracked or wetted by second phases. Macrosegregation of Y2BaCuO5 particles developed mainly in the regions formed by c-axis growth. The segregation is related to a Y2BaCuO5 particle pushing by the YBa2CU3O7-x growth front, in combination with coarsening by Ostwald ripening and agglomeration. The structure of 90 degrees high-angle grain boundaries appeared to be similar to that of the low-angle grain boundaries. (C) 1997 Academic Press Limited.
引用
收藏
页码：403 / 413
页数：11
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