Effect of Ferroelectric Properties on Heat Treatment for Bi_4-x+yLa_xTi₃O_12-δ (x=0.5, y=0; x=0.75, y=0; x=0.75, y=0.15) Ferroelectric Ceramics

Abstract

We investigated the effect of ferroelectric property on heat treatment at high oxygen partial pressure or vacuum for Bi_4-x+yLa_xTi₃O_12-δ (x=0.75, y=0; x=0.50, y=0; x=0.75, y=0.15). The remnant polarization (P_r) increases with increasing oxygen partial pressure during heat treatment. The coercive electric field (E_c) showed the same tendency as P_r at x=0.75 and y=0. In x=0.5 and y=0, E_c decreased with increasing oxygen partial pressure during heat treatment. T_c decreased by heat treatment under high oxygen partial pressure.