Abstract
Barium strontium titanate is an important electronic functional ceramics, which has a strong dielectric nonlinearity and excellent ferroelectricity. In the present study Ba0.7Sr0.3TiO3 ceramics were synthesized by conventional solid state reaction method. The effects of sintering temperature on the microstructure, dielectric and ferroelectric properties of Ba0.7Sr0.3TiO3 ceramics have been investigated. The XRD results show that Ba0.7Sr0.3TiO3 ceramics sintered at 1350–1450 °C were single tetragonal phase. The lattice constant and tetragonality decreased as sintering temperature increasing. The grain size increased with the rise of sintering temperature. The dielectric properties of Ba0.7Sr0.3TiO3 ceramics sintered at 1350 °C were superior to that of the ceramic samples sintered at 1400 and 1450 °C. The decrease of tetragonality with the rise of sintering temperature leaded to the fall of the Curie temperature of Ba0.7Sr0.3TiO3 ceramics. Ba0.7Sr0.3TiO3 ceramics sintered at 1350–1450 °C were relaxor ferroelectrics. The diffuseness weakened as sintering temperature increase. The remnant polarization and coercive field gradually increased with the rise of sintering temperature.
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