Author/Authors :
Zhijian Wang، نويسنده , , Minghe Cao، نويسنده , , Zhonghua Yao، نويسنده , , Guangyao Li، نويسنده , , Yi-Zhe Song، نويسنده , , Wei Hu، نويسنده , , Hua Hao، نويسنده , , Hanxing Liu، نويسنده , , Zhiyong Yu، نويسنده ,
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.
Keywords :
B. Nonstoichiometry , C. Energy storage property , microstructure , D. SrTiO3 ceramic
