Title: Influence of the Oxygen Partial Pressure in the Reducing Gas on SrTiO<sub>3</sub> Semiconductor Ceramics
Abstract: SrTiO3 ceramics were sintered under various oxygen partial pressures. The relationship between the oxygen partial pressure and properties of sintered samples was investigated by TEM, EDX and XRD measurements. At lower oxygen partial pressure, the Ti8O15 phase about 5μm in diameter existed at triple points. On the contrary, at higher oxygen partial pressure the Ti3O5 phase about 0.5μm in diameter existed at triple points. The stability of Magnéli phases was discussed on the basis of thermodynamic data. Lowering of oxygen partial pressure resulted in an increase in oxygen vacancies and lattice parameters and further in a decrease in electric resistivity.