Dielectric and piezoelectric properties of bismuth-containing complex perovskite solid solution of Bi_1/2Na_1/2TiO₃−Bi(Mg_2/3Nb_1/3)O₃

摘要

New lead-free bismuth-containing complex perovskite solid solution, (1−x)(Bi_1/2Na_1/2)TiO₃−xBi(Mg_2/3Nb_1/3)O₃, were synthesized by conventional solid state reaction method. Effect of Bi(Mg_2/3Nb_1/3)O₃ on crystal structure, dielectric and piezoelectric properties were investigated. The XRD analysis showed that all compositions can form single perovskite phase with rhombohedral symmetry. Addition of small amount of Bi(Mg_2/3Nb_1/3)O₃ improves piezoelectric properties and the optimal piezoelectric properties of d ₃₃ = 94 pC/N and k _t = 0.46 were obtained at x = 0.7% and x = 0.9%, respectively. Temperature dependence of dielectric constant ε _r measurement indicated these compounds were typical relaxor ferroelectric.