Influence of Composition on Properties of BNT-BT Lead-Free Piezoceramics
来源期刊：JOURNAL OF RARE EARTHS2006年增刊第2期
论文作者：Gao Chunhua Chen Zhigang Huang Xinyou Liu Huiping
Key words：(Bi1/2Na1/2)TiO3; lead-free piezoelectric ceramics; piezoelectric ceramics; lanthanum oxide; barium titanate;
Abstract: Lead-free piezoelectric ceramics of (Bi1/2Na1/2)TiO3-BaTiO3(BNT-BT) were prepared by the conventional piezoelectric ceramic preparation technique (free air atmosphere sintering). The influence of BaTiO3 additive amount and La2O3 additive amount on the properties of BNT-BT lead-free piezoceramics were investigated. The results show that the dielectric constant(ε) and piezoelectric strain constant(d33) of materials start increasing and then decreasing while BaTiO3 additive amount increasing, the ε and d33 of materials have maximum value (ε=1650, d33=120 PC·N-1) while x(BaTiO3)=0.06 mol. The ε and d33 of materials start increasing and then decreasing while La2O3 additive amount increasing, the ε and d33 of materials have maximum value (ε=1684, d33=153 PC·N-1) while w(La2O3)=0.3%. The influence of La2O3 additive amount on the microstructure of BNT-BT piezoelectric ceramics was analysed by SEM(scanning electron microscope). The influence mechanism of La2O3 additive amount on the properties of BNT-BT piezoelectric ceramics was discussed. The BNT-BT ceramics with optimum comprehensive properties were obtained.
Gao Chunhua1，Chen Zhigang1，Huang Xinyou1，Liu Huiping1
(1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China)
Abstract:Lead-free piezoelectric ceramics of (Bi1/2Na1/2)TiO3-BaTiO3(BNT-BT) were prepared by the conventional piezoelectric ceramic preparation technique (free air atmosphere sintering). The influence of BaTiO3 additive amount and La2O3 additive amount on the properties of BNT-BT lead-free piezoceramics were investigated. The results show that the dielectric constant(ε) and piezoelectric strain constant(d33) of materials start increasing and then decreasing while BaTiO3 additive amount increasing, the ε and d33 of materials have maximum value (ε=1650, d33=120 PC·N-1) while x(BaTiO3)=0.06 mol. The ε and d33 of materials start increasing and then decreasing while La2O3 additive amount increasing, the ε and d33 of materials have maximum value (ε=1684, d33=153 PC·N-1) while w(La2O3)=0.3%. The influence of La2O3 additive amount on the microstructure of BNT-BT piezoelectric ceramics was analysed by SEM(scanning electron microscope). The influence mechanism of La2O3 additive amount on the properties of BNT-BT piezoelectric ceramics was discussed. The BNT-BT ceramics with optimum comprehensive properties were obtained.
Key words:(Bi1/2Na1/2)TiO3; lead-free piezoelectric ceramics; piezoelectric ceramics; lanthanum oxide; barium titanate;
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