Enhanced d_(33) value of Bi_(0.5)Na_(0.5)TiO_3-(Ba_(0.85)Ca_(0.15))(Ti_(0.90)Zr_(0.10))O_3 lead-free ceramics

摘要

(1-x)Bi_(0.5)Na_(0.5)TiO_3-(Ba_(0.85)Ca_(0.15))(Ti_(0.90)Zr_(0.10))O_3 [(1-x)BNT-xBCTZ] lead-free piezoelectric ceramics were prepared by a conventional solid reaction method. A stable solid solution is well formed between BNT and BCTZ. The ε_r increases, and the T_m, T_d, and the density slightly decrease with increasing BCTZ content. Moreover, the d_(33) value of (1 -x)BNT-xBCTZ ceramics with x - 0.06 demonstrates a temperature independence and a poling electric field dependence. (1 - x)BNT-xBCTZ ceramics with x = 0.06 exhibit an optimum electrical behavior: d_(33) ~ 158 pC/N, k_p ~31.2%, and ε_r ~ 1165, which is much better than that of pure BNT ceramic. As a result, (1 - x)BNT-xBCTZ ceramics are a promising candidate material for the piezoelectric device.