High-power piezoelectric characteristics of manganese-modified BiScO _3-PbTiO3 high-temperature piezoelectric ceramics

Hard piezoelectric ceramics of manganese (Mn)-modified 0.36BiScO _3-0.64PbTiO3 (0.36BS-0.64PTM) with a high Curie temperature were prepared using the traditional solid-state reaction method. The effects of different concentrations of Mn on the structure, dielectric and piezoelectric properties of the 0.36BS-0.64PTM ceramics were investigated. X-ray diffraction results indicated that the 0.36BS-0.64PTM ceramics showed a single perovskite structure with tetragonal symmetry and the c/a ratio decreased slightly with increasing Mn content. The grain sizes of the 0.36BS-0.64PTM ceramics were enlarged by Mn addition, and their distributions were uniform. The dielectric loss tanδ decreased clearly with the increase in Mn content, and the mechanical quality factor Q m and vibration velocity v 0 were improved significantly at the same time. The Curie temperature T c, the planar electromechanical coupling factor k p, dielectric loss tanδ, mechanical quality factor Q m and vibration velocity v 0 of the 0.36BS-0.64PTM ceramics with 3mol% Mn were about 431°C, 0.57, 0.007, 134 and 1.05ms ¹, respectively. The maximum vibration velocity v ₀ of the 0.36BS-0.64PTM ceramics is much superior to those of PZT (0.4ms ¹) ceramics and PZT-PZM (0.72ms ¹). These results indicated that the 0.36BS-0.64PTM ceramics are promising candidates for high-temperature and high-power piezoelectric applications.