TEMPERATURE CHARACTERISTICS STUDIES OF NANOCRYSTALLITE SRTIO3 GRAIN-BOUNDARIES BY X-RAY PHOTOELECTRON-SPECTROSCOPY

Strontium titanate (SrTiO3) nanocrystallite thin films have been studi ed by x-ray photoelectron spectroscopy st different temperature. The s urface oxygen concentration and Ti/Sr ratio increase with temperature rising up to 700K, and then decrease. New Ols and Ti 3d peaks appear a t the low binding energy side of the corresponding main peaks, these n ew peaks have some different features from the corresponding main peak s, this phenomenon was not observed in single crystal SrTiO3. A model is proposed to explain this interesting phenomenon.