Atomic structure of a Ca-doped [001] tilt grain boundary in MgO

被引：14

作者：

Yan, Y

Chisholm, MF

Duscher, G

Pennycook, SJ

机构：

[1] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA

[2] Univ Illinois, Dept Phys, Chicago, IL 60607 USA

来源：

JOURNAL OF ELECTRON MICROSCOPY | 1998年 / 47卷 / 02期

关键词：

Z-contrast; EELS; STEM; grain boundary; MgO;

D O I：

10.1093/oxfordjournals.jmicro.a023567

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

The atomic structure of a symmetric 24 degrees[001] tilt grain boundary in MgO has been derived directly from high-resolution Z-contrast images obtained in a scanning transmission electron microscope. The images indicate the presence of impurities (Z>12) and vacancies at the boundary. High spatial resolution electron energy-loss spectroscopy has been used to determine that the segregated impurity is Ca. The specific sites occupied by Ca are obtained from the image and bond valence sum analysis.

引用

页码：115 / 120

页数：6

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