Distortion control of (1-x)Ba(Hf,Ti)O3-x(Ba,Ca)TiO3 piezoelectric ceramics to improved piezoelectric properties and related Curie temperature

초록

In this paper, we have studied the correlation between the Curie temperature and tolerance factor of the (1-x)BHT-xBCT system. In a perovskite system, the distortion between the lattice parameters, a and c, can be used to investigate the tolerance factor. By changing the (Ba,Ca)TiO3 ratio in the (1-x)BHT-xBCT system, the distortion of the lattice parameter can be varied. The tolerance factor is also related to the distortion values of perovskite systems. Therefore, the Curie temperature of (1-x)BHT-xBCT ceramics can be controlled by the tolerance factor. To confirm this assumption, we fabricated and analyzed (1-x)BHT-xBCT ceramics for x = 0.3, 0.4, 0.5, 0.6, and 0.7, sintered at the various temperature range from 1400° to 1600 °C. We confirmed that the highest piezoelectric property, d33 of 540 pC/N was observed in the polymorphic phase transition (PPT) region when x = 0.5, for all sintering temperature conditions. © 2021 Elsevier B.V.

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