Abstract
Effects of nonstoichiometric SrTiO3 ceramics have been investigated in the range of Sr/Ti=0.994–1.004. A cubic perovskite structure is maintained at all compositions without any secondary phase. Grain size increases at the beginning and then decreases with increasing Sr/Ti ratio. The highest breakdown strength and energy density are obtained at Sr/Ti=0.996, 283 kV/cm and 1.21 J/cm3, respectively, which are higher than that of stoichiometric SrTiO3 ceramic (210 kV/cm of breakdown strength, 0.7 J/cm3 of energy density). Sr/Ti>1 ST ceramics are prone to semi-conductivity process. Among them, the ST ceramic at Sr/Ti=1.004 has the highest permittivity, 2455.
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