Ferroelectric polarization and piezoelectric properties of layer-structured K0.5Bi4.5Ti4O15 single crystals

Abstract

Single crystals of ferroelectric K0.5Bi4.5Ti4O15 with a Bi-layered structure were grown by the flux method, and the properties of polarization hysteresis, piezoelectric strain, and leakage current were investigated along the polar a axis at 25°C. K0.5Bi4.5Ti4O15 crystals exhibited a large remanent polarization of 31μC∕cm2, which suggests that K0.5Bi4.5Ti4O15 has the largest spontaneous polarization among Bi layer-structured ferroelectrics with four TiO6 layers in the perovskite blocks. Strain measurements showed that the piezoelectric strain constant was 31pm∕V.