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 0.36BiScO3-0.64PbTi0.97Fe0.03O3 + 1 mol% MnO2 (BS-PTFMn + x% 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 (T 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.
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