Defect-related properties of SrTiO3.

The defect structure and the chemical diffusion coefficients Dchem were determined in Ti excess undoped and Nb doped SrTiO3 thin films as well as in undoped SrTiO3 single crystal (1 0 0). The observed difference in Dchem was explained basing on the defect structure models. In both cases of SrTiO3 thin films, the low-mobility strontium vacancies are the predominant defects, while in case of SrTiO3 single crystal the high-mobility oxygen vacancies are responsible for the much faster oxygen gradient decay.