Phase transition, dielectric and piezoelectric properties of NaNbO3-Bi0.5Li0.5TiO3 lead-free ceramics

作者：Fu Lingling; Lin Dunmin^*; Zheng Qiaoji; Wu Xiaochun; Wu Lang; Sun Hailing; Wan Yang; Fan Ximing; Xu Chenggang

来源：Current Applied Physics, 2012, 12(6): 1523-1528.

DOI：10.1016/j.cap.2012.04.032

• Lead-free
• Piezoelectric
• Ferroelectric
• Dielectric
• NaNbO3

Lead-free ceramics (1-x)NaNbO3-xBi0.5Li0.5TiO3 have been fabricated by an ordinary sintering technique, and their electric properties and temperature characteristics have been studied. All the ceramics possess a perovskite structure with orthorhombic symmetry, indicating that (Bi0.5Li0.5)TiO3 diffuses into NaNbO3 lattices to form a new solid solution. A low (Bi0.5Li0.5)TiO3 doping level transforms the NaNbO3 ceramics from antiferroelectric to ferroelectric. The ceramics with x <= 0.075 are normal ferroelectric, and the ferroelectric-paraelectric phase become diffusives with the doping level of Bi0.5Li0.5TiO3 increasing. As x increases, the Curie temperature of the ceramics decreases linearly, while the relative permittivity er increases. 0.925NaNbO(3)-0.075(Bi0.5Li0.5)TiO3 ceramic exhibits the relatively large piezoelectric constant (d(33) = 58 pC/N), high Curie temperature (T-C = 228 degrees C) and good temperature stability, suggesting that the ceramics are one of new possible candidates for lead-free piezoelectric materials.

• 出版日期2012-11
• 单位四川师范大学; 西南科技大学