Abstract

The dielectric and ferroelectric properties of Ba 1− x Sr x TiO 3 (BST) ( x = 0.10 , 0.20 , 0.30 , 0.40 and 0.60) ceramics and Ba 1−2 x Sr x Ca x TiO 3 (BSCT) ( x = 0.10 , 0.20 , 0.30 ) ceramics have been investigated. The low temperature phase transitions of BST ceramics vanish after Ca 2+ substitution while the high temperature transition is diffused and relaxed, which becomes more obvious with increasing x . Ca 2+ substitution obviously decreases the dielectric constant maximum, K m , of BST ceramics and changes the temperature of dielectric constant maximum, T m , of BST ceramics. The shift of T m in BST is attributed mainly to the Sr 2+ and Ba 2+ concentration. BST ceramics exhibit almost normal ferroelectric characteristics, while a typical relaxor behavior was observed in BSCT ceramics. The relaxor behavior observations may be understood by a random electric field induced domain state.

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