Orientation dependent oxygen exchange kinetics on single crystal SrTiO sub(3) surfaces

The perovskite SrTiO sub(3) is arguably one of the most important oxide systems in condensed matter research. In this study, we report measurement of the orientation dependence of oxygen exchange on SrTiO sub(3) single crystal surfaces by dynamic conductivity measurements under electrochemical pertu...

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Published inPhysical chemistry chemical physics : PCCP Vol. 14; no. 34; pp. 11953 - 11960
Main Authors Kerman, Kian, Ko, Changhyun, Ramanathan, Shriram
Format Journal Article
LanguageEnglish
Published 01.08.2012
Subjects
Condensed matter
Dynamical systems
Dynamics
Orientation
Partial pressure
Single crystals
Strontium titanates
Surface chemistry
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Summary:The perovskite SrTiO sub(3) is arguably one of the most important oxide systems in condensed matter research. In this study, we report measurement of the orientation dependence of oxygen exchange on SrTiO sub(3) single crystal surfaces by dynamic conductivity measurements under electrochemical perturbations. Activation energy for electrical conduction in the 923-1223 K range at an oxygen partial pressure of similar to 10 super(-11) Pa of (100), (111), and (110) single crystals was found to be 2.6 eV, 2.7 eV, and 3.1 eV, respectively. The equilibration kinetics show profound dependence on the surface orientation and are modelled using a heterogeneous relaxation process. All surfaces show similar cationic sub-lattice limited rate behavior with (111), (100), and (110) having the fastest, intermediate, and slowest rates, respectively. We discuss the orientation dependence and its relation to local atomic structure in light of previous experimental and theoretical studies.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c2cp41918a