Chiang Mai Journal of Science

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Piezoelectric properties of a solid solution based on three components of bismuth sodium titanate, (Bi_1/2Na_1/2)TiO₃(BNT), bismuth potassium titanate, (Bi_1/2K_1/2)TiO₃(BKT), and barium titanate, BaTiO₃ (BT), that is, x(Bi_1/2Na_1/2)TiO_3-y(Bi_1/2K_1/2)TiO₃-zBaTiO₃ [abbreviated to BNBKy:z(x); y:z=2:1, 4:1 and 10:1, x+y+z=1] are studied as a lead-free piezoelectric material. The highest electromechanical coupling factor, k₃₃, and piezoelectric constant, d33, were 0.56 and 186 pC/N for BNBK2:1(0.878), 0.56 and 191 pC/N for BNBK4:1(0.852), and 0.52 and 180 pC/N for BNBK10:1(0.826). Nevertheless, the second phase transitions, T2, of these compositions are about 120ºC. The T₂s shift to higher temperatures with decreasing the amount (x) of BNT content. Finally, the T₂ higher than 200ºC was obtained with x £ 0.75, that the k₃₃ and d₃₃ for BNBK2:1(0.75) and BNBK4:1(0.75) were 0.44 and 116 pC/N, and 0.45 and 134 pC/N, respectively.

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