Thermodynamic equilibrium studies of nanocrystallite SrTiO3 grain boundaries by high temperature photoelectron spectroscopy |
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Authors: | Zhenxiang Liu and Kan Xie |
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Affiliation: | (1) Institute of Physics, State Key Laboratory of Surface Physics, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | Nanostructured strontium titanate (SrTiO3) thin films are studied by high temperature photoelectron spectroscopy and thermal gravimetric analysis. The results indicate
that ion migration and redistribution as well as transformation between lattice oxygen and gas phase oxygen take place near
the grain boundaries during thermodynamic equilibrium process, which lead to obvious variation of the surface composition
with temperature. The lattice oxygen ions migrate from bulk to grain surface with temperature rising up; meanwhile Ti ions
also migrate to grain surface and combine with oxygen ions forming Ti-0 complex. An opposite process takes place during temperature
falling down, but the latter process is much slower than the former one. A primary model is proposed to explain this phenomenon. |
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Keywords: | surface oxides grain boundary |
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