LAUSR

Compared with pure Pb-based perovskite ferroelectric materials, Bi(Me)O3–PbTiO3 (Me = Sc3+, In3+, Yb3+) have attracted attention due to their remarkable advantage in their Curie temperature. Among them, BiScO3–PbTiO3 piezoelectric ceramic is a potential piezoelectric material in high-temperature applications for its high Curie temperature and excellent piezoelectric coefficient. However, its shortcomings are high dielectric loss and low mechanical quality factor. Herein, we report the improvement of the mechanical quality factor of 0.36BS–0.64PT ceramics through the addition of glass composition (GeO2). There is a small change in the Curie temperature after GeO2 addition. The piezoelectric coefficient d33 and planar electromechanical coupling factor kp increase first and then decrease, and the mechanical quality factor Qm monotone increases with an increase in GeO2. The 0.36BS–0.64PT + 0.5 mol%GeO2 ceramics have optimal electrical properties with TC of 455 °C, d33 of 385 pC N−1, kp of 58%, and Qm of 90. In addition, the thermal stability of 0.36BS–0.64PT + xGeO2 and 0.36BS–0.64PT ceramics is almost the same. It was concluded that the mechanical quality factor of BS–PT ceramics can be enhanced by the addition of GeO2 with other properties remaining unchanged.