Investigation of Structural and Electrical Properties of B-Site Complex Ion (Mg1/3Nb2/3)4+-Modified High-Curie-Temperature BiFeO3-BaTiO3 Ceramics

B-site complex ion (Mg1/3Nb2/3)-modified high-temperature ceramics 0.71BiFeO(3)-0.29BaTi(1-x) (Mg1/3Nb2/3) (x) O-3 (BF-BTMNx) have been fabricated by the conventional solid-state reaction method. The compositional dependence of thea phase pound structure, electrical properties, and depolarization temperature of the ceramics was studied. The main phase structure of BF-BTMNx ceramics is perovskite phase with pseudocubic symmetry. The experimental results show that the dielectric and piezoelectric properties, and temperature stability strongly depend on the (Mg1/3Nb2/3)(4+) content. The optimum (Mg1/3Nb2/3) content enhances the piezoelectric properties, Curie temperature, and depolarization temperature. The ceramic with x = 1% exhibited enhanced electrical properties of d (33) = 158 pC/N and k (p) = 0.322, combined with high-temperature stability with Curie temperature of T (c) = 453A degrees C and depolarization temperature of T (d) = 400A degrees C. These results show that the ceramic with x = 1% is a promising lead-free high-temperature piezoelectric material.