Off-morphotropic-phase-boundary 74(Bi1/2Na1/2)TiO3 – 20.8(Bi1/2K1/2)TiO3 -

5.2BaTiO3 ceramics were fabricated at different sintering temperatures. It was

found out that as the sintering temperature increased, the volatilization of the A-site

elements was aggravated, thus generating the oxygen vacancies; meanwhile, the

tetragonality of the perovskite lattice was gradually reduced. Besides, the

temperature-dependent dielectric responses revealed that as the sintering

temperature was increased, the depolarization temperature Td decreased while the

Curie–Weiss point TC increased. It was suggested that the lattice distortion, other

than the oxygen vacancies, was the crucial factor in influencing the depolarization

temperature.

[Dependence of Depolarization Temperature on Cation Vacancies and Lattice

Distortion for Lead-Free 74(Bi1/2Na1/2)TiO3–20.8(Bi1/2K1/2)TiO3–5.2BaTiO3

Ferroelectric Ceramics. M.Zhu, H.Hu, N.Lei, Y.Hou, H.Yan: Applied Physics

Letters, 2009, 94[18], 182901