Abstract
Bi4Ti3-x(Mg1/2W1/2)xO12 (BTMW100x) ceramics were synthesized using a direct reaction method combined with a two-step sintering technique. The study systematically investigated the effects of B-site equivalent substitution of (Mg1/2W1/2)4+ on BTMW100x ceramics. The experimental results indicate that an appropriate amount of (Mg1/2W1/2)4+ doping effectively reduces grain thickness, enhances grain distribution uniformity, and decreases the concentration of oxygen vacancies. Consequently, these modifications lead to improved piezoelectric performance while maintaining a high Curie temperature. Notably, Bi4Ti2.95(Mg1/2W1/2)0.05O12 (BTMW5) ceramics exhibit excellent piezoelectric properties and thermal stability, with a piezoelectric coefficient of 23 pC/N and a Curie temperature of 683 °C. These findings suggest that BTMW5 ceramics are promising candidates for high-temperature piezoelectric applications.
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