Thermal Depolarization and Ferroelectric Properties of (Bi0.5Na0.5)1 - xBaxTiO3 Ceramics.

Ferroelectric (Bi0.5Na0.5)1 - xBaxTiO3 ceramics with different compositions near the morphotropic phase boundary were fabricated by a citric method. The crystalline structure, microstructure, piezoelectric and ferroelectric properties were systemically studied. A thermal depoling experiment was used to investigate the depolarization temperature and stability of polarization near their depolarization temperature. The results indicated that mix-structured compositions (x = 0.06) have a low depolarization temperature and showed a significant reduction in piezoelectric constant well below their depolarization temperature, while x = 0.08 showed a good resistance to thermal depoling up to their depolarization temperature. The variation trends of the pyroelectric coefficients with different temperature agreed with the thermal depoling experiments and revealed their ferroelectric nature. [ABSTRACT FROM AUTHOR]