Effect of Crystal Structure on the Electrical Properties of CaTi1 – xFexO3 – δ

The electrical conductivity of CaTi1 – xFexO3 – δ(x= 0–0.5) was measured as a function of temperature and oxygen partial pressure. At 1000°C, the highest conductivity was observed at x= 0.2. The crystal structure of the materials with x= 0, 0.2, 0.25, and 0.3 was studied by x-ray powder diffraction and refined by the full-profile analysis method. The results were used to elucidate the mechanisms of the high-temperature (≥1000°C) formation, ordering, and transport of oxygen vacancies in CaTiO3upon substitution of Fe3+for Ti4+. The composition dependences of ionic conductivity calculated for CaTi1 – xFexO3 – δagree well with experiment.