期刊
SURFACE SCIENCE
卷 595, 期 1-3, 页码 115-126出版社
ELSEVIER
DOI: 10.1016/j.susc.2005.07.041
关键词
strontium titanate; polycrystalline surface; oxidation; segregation; defect chemistry
Structural and chemical phenomena observed after high temperature oxidation (1200 degrees C for 30 h) of initially reduced Nb-doped (5 at.%) polycrystalline SrTiO3 are reported. The reoxidation procedure leads to the formation of Sr-rich islands on the surface. These islands exhibit characteristic areal densities, shapes, and sizes that depend on the surface orientation of the corresponding grain. A correlation between grain orientation (determined by orientation imaging microscopy) and tendency towards island formation was found and discussed in terms of surface energies. The structure and the composition of the islands were investigated by transmission electron microscopy and significant differences were observed for islands of different height located on differently oriented surfaces. While a small island stayed in the perovskite structure (despite a gradual and partly strong Ti depletion) a crystal structure change was found for a larger island containing Sr cations only. (c) 2005 Elsevier B.V. All rights reserved.
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