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Effect of Variations in Stoichiometry on the Surface Structure of SrTiO 3 (001)
Author(s) -
Liang Yong,
Bonnell Dawn
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08033.x
Subject(s) - stoichiometry , sublimation (psychology) , annealing (glass) , auger electron spectroscopy , sputtering , rutherford backscattering spectrometry , analytical chemistry (journal) , scanning tunneling microscope , chemistry , auger , materials science , atomic physics , thin film , nanotechnology , metallurgy , psychology , physics , chromatography , nuclear physics , psychotherapist
Variations in Stoichiometry of SrTiO 3 (001) surfaces with high‐temperature exposure to reducing environments were quantified with Rutherford backscattering and Auger electron spectroscopies. In addition to the expected oxygen loss, cation‐cation ratios varied systematically. Specifically, the surface becomes Ti‐ and O‐deficient at all temperatures. The associated surface structures determined by scanning tunneling microscopy showed that the surface accommodates nonstoichiometry by adopting periodic structures of characteristic suboxides with the formula Sr n+1 Ti n O 3n+1 . The chemical and structural variations are discussed in terms of mass transport models for sublimation and segregation. Since previous surface studies had been concerned with effects of sputtering or the behavior of stoichiometric surfaces, the results presented here represent the first systematic study of compositional variations upon annealing of the (001) surface.