Structural and Dielectric Properties of <scp> Bi (Mg _1/2 Ti _1/2 )O ₃ –BaTiO ₃ </scp> Lead‐Free Ceramics

Abstract

By the conventional mixed oxide method (1− x )Bi(Mg 1/2 Ti 1/2 )O 3 – x BaTiO 3 ( (1− x )BMT– x BT , x = 0.2−1.0) ceramics were prepared. For x ≤ 0.4, a bismuth‐rich phase was observed beside the perovskite phase. For 0.5 ≤ x ≤ 0.92 ceramics, all the compositions belong to the pseudocubic phase, while the tetragonal phases were formed when x ≥ 0.94. With the increase of BT content, a change from a relaxor‐like behavior to a normal ferroelectric behavior was observed, while the change of T max is in the form of “U” curve. Furthermore, stable dielectric permittivity (1500–3000) and low losses (tan δ &lt; 2%) were obtained in the 0.4 ≤ x ≤ 0.6 ceramics in the temperature range 200°C–400°C, indicating a potential for high‐temperature applications.