Abstract
Structural, dielectric and piezoelectric properties of (1− x)(Na 1/2Bi 1/2)TiO 3– xPb(Mg 1/3Nb 2/3)O 3 (NBT– xPMN) solid solution have been investigated. An addition of PMN into NBT transformed the structure of sintered samples from rhombohedral to pseudocubic phase where x is larger than 0.1. In calcined powders, however, the intermediate structure were observed between rhombohedral and cubic phases near x=0.1. The formation of solid solution between NBT and PMN modified the dielectric and piezoelectric properties of NBT to be suitable for high temperature dielectric and piezoelectric material. With increasing the content of PMN, the temperature-stability of ε r( T) increased and the high temperature dielectric loss decreased. In addition, the piezoelectric property of NBT– xPMN was enhanced, for the decrease of coercive field and conductivity promoted the domain reversal under the high electric field of the poling process.
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