Electric field induced monoclinic phase stability in Ca doped Na0.5Bi0.5TiO3: Case of 0.93Na0.5Bi0.5 TiO3 - 0.07CaTiO3 ferroelectric ceramics

Abstract

The ferroelectric perovskite complex 0.93Na0.5Bi0.5TiO3 - 0.07CaTiO3 (NBT -0.07CT) ceramics were studied by a simple X-ray diffraction upon application of an increasing electric field. It is shown that the field induced rhombohedral (R3c) to monoclinic (Cc) phase transition at room temperature. This induced phase is stable after removal the electric field. Our results has been interpreted by intrinsic polarization rotation theory, in comparison with Pb-base system such as PMT-PT, PZN-PT, …near the morphotropic phase boundary (MPB) region. Apparently, the NBT - 0.07CT pretends to have a ferroelectric and structural instability around room temperature.