期刊
SURFACE SCIENCE
卷 604, 期 17-18, 页码 1476-1480出版社
ELSEVIER
DOI: 10.1016/j.susc.2010.05.011
关键词
Electron microscopy; Surface segregation; Diffusion and migration; SrLaAlO4; Single crystal surfaces
资金
- US Department of Energy [DOE DE-FG02-01ER45945]
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
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.
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