Poling temperature tuned electric-field-induced ferroelectric to antiferroelectric phase transition in 0.89Bi_0.5Na _0.5TiO₃-0.06BaTiO₃-0.05K_0.5Na _0.5NbO₃ ceramics

We report the electric-field-induced ferroelectric (FE_IN) to antiferroelectric (AFE) phase transition that is tuned by the poling temperatures in 0.89Bi_0.5Na_0.5TiO₃-0. 06BaTiO₃-0.05K_0.5Na_0.5NbO₃ (0.89BNT-0.06BT-0.05KNN) ceramics. Phase transition and pyroelectric behaviors of the ceramics were investigated as functions of temperature and electric field. Pyroelectric coefficient peaks of (3 ∼ 6.5) × 10^-8 °C cm^-2 K^-1 are detected at about 10 C above the poling temperatures for the samples poled at different temperatures. The poling temperature tuned pyroelectric behaviors are attributed to the FE_IN to AFE phase transition when the temperature increases.