Sol–gel synthesis and characterization of Ba(1−x)SrxTiO3 ceramics

Ba(1−x)SrxTiO3 (x = 0, 0.1, 0.2, 0.3) nanopowders were synthesized from alkoxide solution precursor by sol–gel process. The Ba(1−x)SrxTiO3 powders calcined at 800 °C for 2 h were maintained in cubic phase and the cell parameters were in the range of 4.0282–3.9786. The effects of Sr doping and sintering temperature on structure and dielectric characteristics of the Ba(1−x)SrxTiO3 ceramics were investigated. The increase of Sr content in the Ba(1−x)SrxTiO3 ceramics causes the inhibition of grain growth and downward shift of Curie temperature (Tc). The Tc shift rate is 2.5 °C/mol% with increasing Sr content. At Tc, the dielectric constants of Ba(1−x)SrxTiO3 ceramics increase with the increasing of sintering temperature, and the highest permittivity (7032) is obtained for x = 0.1 sample sintered at 1400 °C.