Strontium oxide segregation at SrLaAlO4 surfaces

被引：14

作者：

Becerra-Toledo, A. E. ^{[1
]}

Marks, L. D. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

SURFACE SCIENCE | 2010年 / 604卷 / 17-18期

关键词：

Electron microscopy; Surface segregation; Diffusion and migration; SrLaAlO4; Single crystal surfaces; SRLAGAO4; CRYSTALS; DEFECTS; CHEMISTRY; GROWTH; SRTIO3; GA;

D O I：

10.1016/j.susc.2010.05.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report observable segregation of strontium oxide at the surface of strontium lanthanum aluminate single-crystals annealed in oxidizing conditions. Electron microscopy imaging and energy-dispersive X-ray spectroscopy showed that Sr and O segregation occurs on strontium lanthanum aluminate surfaces in the form of polycrystalline islands. The appearance of islands on the (100) and other high-free energy surfaces is strongly suggestive of rocksalt SrO formation. The loss of strontium oxide from the bulk is not compensated solely by point defects, but rather by non-stoichiometric stacking faults which locally result in stable perovskite structures. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1476 / 1480

页数：5

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