Effect of Crystallographic Texture on the Field-Induced-Phase Transformation Behavior of Bi 0.5Na 0.5TiO 3−7BaTiO 3−2K 0.5 Na 0.5NbO 3

Abstract

The electric-field-induced phase transformation of {001}pc oriented Bi0.5Na 0.5TiO 3−7BaTiO 3−2K 0.5Na 0.5NbO 3 bulk ceramics with a 8.3 multiples of a random distribution fiber texture was investigated using in situ diffraction. Field-dependent diffraction suggests that the high strain is a result of an electric-field-induced pseudo-cubic to tetragonal phase transformation, where the induced tetragonal phase has a strong domain texture. The effect of electric field direction was investigated by applying the electric field parallel and perpendicular to the fiber texture axis. Applied field direction affected the lattice spacing of the induced phase, domain texture, and increased poling field to induce the phase transformation.