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Structural and Dielectric Properties of Bi (Mg1/2Ti1/2)O3–BaTiO3 Lead‐Free Ceramics

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By the conventional mixed oxide method (1−x)Bi(Mg1/2Ti1/2)O3xBaTiO3 ((1−x)BMT–xBT, 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 < 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.

Document Type: Research Article


Publication date: 2011-12-01

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