Abstract
Lead-free piezoelectric ceramics of (Bi 1/2Na 1/2)TiO 3-BaTiO 3(BNT-BT) were prepared by the conventional piezoelectric ceramic preparation technique (free air atmosphere sintering). The influence of BaTiO 3 additive amount and La 2O 3 additive amount on the properties of BNT-BT lead-free piezoceramics were investigated. The results show that the dielectric constant(ɛ) and piezoelectric strain constant ( d 33) of materials start increasing and then decreasing while BaTiO 3 additive amount increasing, the ɛ and d 33 of materials have maximum value (ɛ = 1650, d 33 = 120 PC · N −1) while x (BaTiO 3) = 0.06 mol. The ɛ and d 33 of materials start increasing and then decreasing while La 2O 3 additive amount increasing, the ɛ and d 33 of materials have maximum value (ɛ = 1684, d 33 = 153 PC · N −1) while w(La 2O 3) = 0.3%. The influence of La 2O 3 additive amount on the microstructure of BNT-BT piezoelectric ceramics was analysed by SEM (scanning electron microscope). The influence mechanism of La 2O 3 additive amount on the properties of BNT-BT piezoelectric ceramics was discussed. The BNT-BT ceramics with optimum comprehensive properties were obtained.
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