Abstract
Abstract The electrical conductivity of polycrystalline strontium titanate with ( Sr Ti = 0.996, 0.99, and 0.98 was determined for the oxygen partial pressure range of 100 to 10−22 atm and the temperature range of 850–1050°C. These data were found to be similar to that obtained for the sample with ideal cationic ratio. The observed data were proportional to the − 1 6 power of oxygen partial pressure for PO2 P −1 4 O 2 for the pressure range 10−8–10−15 atm, and proportional to P +1 4 O 2 for PO2 > 10−4atm. The deviation from the ideal Sr-to-Ti ratio was found to be accommodated by neutral vacancy pairs, (V″Sr V″0. The results indicate that the single-phase field of strontium titanate extends beyond 50.505 mole% TiO2 at elevated temperatures.
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