Electrical properties of Sb₂O₃-modified BiScO₃–PbTiO₃-based piezoelectric ceramics

Abstract

Compared with pure Pb-based perovskite ferroelectric materials, BiMeO₃-PbTiO₃ (Me = Sc³⁺, In³⁺, and Yb³⁺) systems have remarkable advantages in their Curie temperatures. As a member of this group, the BiScO₃-PbTiO₃ (BS-PT) solid solution has drawn considerable attention from scientists for its high Curie temperature and excellent piezoelectric coefficient. However, BS-PT ceramics still have some shortcomings, such as high dielectric loss and low mechanical quality factor, which make them unsuitable for high-temperature applications. Herein, we report the effect of the addition of complex ions on the electrical properties of BS-PT ceramics. Sb₂O₃-doped 0.36BiScO₃-0.64PbTi_0.97Fe_0.03O₃ + 1 mol% MnO₂ (BS-PTFMn + <i>x</i>% Sb₂O₃) ceramics were fabricated and their electrical properties were studied. BS-PTFMn + 0.75% Sb₂O₃ had an optimal piezoelectric coefficient, exhibiting which indicates that Sb₂O₃ doping can improve the piezoelectric properties of the BS-PT ceramics, exhibiting a "soft" effect of Sb₂O₃ doping. In addition, the thermal depolarization temperature (<i>T</i> _d) of BS-PTFMn + 0.75% Sb₂O₃ ceramics remained above 300 °C, such as 325 °C for BS-PTFMn + 0.75% Sb₂O₃. It was concluded that the piezoelectric properties of BS-PT ceramics were enhanced by the addition of Sb₂O₃.