GRAIN-BOUNDARY STUDIES BY THE COINCIDENT-SITE LATTICE MODEL AND ELECTRON-ENERGY-LOSS SPECTROSCOPY OF THE OXYGEN-K EDGE IN YBA2CU3O7-DELTA

被引：52

作者：

ZHU, YM ^{[1
]}

WANG, ZL ^{[1
]}

SUENAGA, M ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1993年 / 67卷 / 01期

关键词：

D O I：

10.1080/01418619308207140

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electron-energy-loss spectroscopy for the oxygen K edge was performed at and near grain boundaries of YBa2Cu3O7 using an electron beam of 20 angstrom diameter in a transmission electron microscope. The analysis of the pre-peak at the absorption edge revealed that there exist both oxygen-deficient (100 angstrom or less wide) and fully oxygenated grain boundaries. These differences depend on the structural misorientations between grains separated by boundaries. The results were consistent with earlier predictions of variable oxygen contents at YBa2Cu3O7 grain boundaries, depending on the misorientations, based on the constrained coincident-site lattice model for the boundary structures.

引用

页码：11 / 28

页数：18

共 39 条

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