2014 年 39 巻 2 号 p. 137-140
Mn-doped 0.45(Bi0.5K0.5)TiO3-0.1Bi(Mg0.5Ti0.5)O3-0.45BiFeO3 (BKT-BMT-BF) ceramics were prepared using BiFeO3 (BF) particles synthesized by a hydrothermal synthesis as a starting material to reduce defects originating from evaporation of Bi2O3. X-ray diffraction patterns revealed that the synthesized BF powder and the sintered BKT-BMT-BF ceramics consisted of a single perovskite phase. The grain size of the BKT-BMT-BF ceramics was lager than that prepared by a conventional solid state synthesis. The high-field piezoelectric properties were largely improved because of de-pinning of domain walls. The remanent polarization of 24.5 μC/cm2 and the apparent piezoelectric coefficient (d33*) of 268 pm/V were recorded.