Abstract
Grain growth behavior as a function of sintering time and effect of grain size on piezoelectric constant of Na0.5Bi0.5TiO3 are investigated. Grain sizes of NBT ceramics are 0.38, 1.23, 1.73, 1.99, 2.31 and 3.65μm. Interface controlled grain growth occurs during isothermal sintering with a grain growth exponent of 2.1. Piezoelectric constant is 17pC/N for a sample with grain size of 0.38μm and around 73pC/N for the remaining samples. Drastic reduction of piezoelectric constant for the sample with sub-micron size grains is due to decrease of non-180o domain wall movement as evidenced by the intensity ratio of (111)/(111¯) of poled samples.
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