Synthesis and diffused phase transition of Ba0.7Sr0.3TiO3 ceramics by a reaction-sintering process

Ba0.7Sr0.3TiO3 (BST) ceramics prepared by a reaction-sintering process were investigated. BST ceramics could be obtained after 2-6 h sintering at 1330-1370 degrees C without any calcination involved. BST with density 5.68 g/cm(3) (99.8% of the theoretic value) was obtained at 1350 degrees C for 6 h sintering. Grains of 2-15 mu m were formed after 2-6 h sintering at 1330-1370 degrees C. A diffused ferroelectric-paraelectric transition was observed in pellets sintered at 1330 degrees C for 2 h and disappeared at a longer soak time or a higher sintering temperature. (C) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.