Structure, Dielectric Properties and Temperature Stability of BaTiO 3 –Bi(Mg 1/2 Ti 1/2 )O 3 Perovskite Solid Solutions

(1− x )BaTiO 3 – x Bi(Mg 1/2 Ti 1/2 )O 3 (1− x )BT– x BMT polycrystalline ceramics were obtained via solid‐state processing techniques. The solubility limit for (1− x )BT– x BMT was determined to be about x =0.07. A systematic structural change from the ferroelectric tetragonal phase to pseudocubic phase was observed at about x ≥0.05 at room temperature. Dielectric measurements revealed a gradual change from normal ferroelectric of pure BaTiO 3 to highly dispersive relaxor‐like characteristics in the solid solution with 30–60 mol% Bi(Mg 1/2 Ti 1/2 )O 3 , showing low‐temperature coefficients of capacitance over a wide temperature range. The properties of Nb 2 O 5 ‐doped 0.85BT–0.15BMT ceramics were investigated to better understand the formation mechanism of core‐shell structure, for further improving the temperature stability of the dielectric behavior.