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Effect of surface treatment on SrTiO3: An x‐ray photoelectron spectroscopic study

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3 Author(s)
Nagarkar, P.V. ; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 ; Searson, P.C. ; Gealy, F.D.

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X‐ray photoelectron spectroscopy was used to study the reoxidation kinetics of both mechanically and chemically polished as well as freshly fractured SrTiO3 surfaces. X‐ray take‐off angles were varied in order to resolve surface contributions from those further into the sample. Most surfaces were found to have Sr/Ti ratios that varied significantly from the stoichiometric ratio of 1. Only the oxygen peaks were found to be take‐off angle sensitive. We tentatively identify both adsorbed hydroxyl and carbonate O 1s levels as these angle sensitive peaks, indicating that hydroxyl adsorption occurs very rapidly.

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Journal of Applied Physics  (Volume:69 ,  Issue: 1 )