A/C YBA2CU3O7 BOUNDARIES - PREFERENTIAL SITES FOR THE NUCLEATION OF EPITAXIAL Y2O3 PRECIPITATES

被引：9

作者：

CATANA, A

SCHLOM, DG

MANNHART, J

BEDNORZ, JG

机构：

[1] IBM Research Division, Zurich Research Laboratory

来源：

APPLIED PHYSICS LETTERS | 1992年 / 61卷 / 06期

关键词：

D O I：

10.1063/1.107803

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Y2O3 precipitates with typical sizes between 70 and 300 nm2 have been identified by high-resolution electron microscopy and image calculations in mixed a- and c-axis oriented YBa2CU3O7 sputtered films. The precipitates are densely distributed (10(15) cm-3), have tabular shape and grow epitaxially at boundaries between a- and c-axis oriented grains, with the (001) Y2O3 plane parallel to the a,b plane of the a-axis oriented grain and the (110) Y2O3 plane parallel to the a,b plane of the c-axis oriented grain. Their largest interfacial facet lies parallel to the a,b plane of the a-axis oriented regions. Lattice-matching arguments show that energetically this situation is the most favorable one, which explains the nucleation of precipitates at a/c boundaries.

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页码：720 / 722

页数：3

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