Abstract
AbstractThe 〈100〉 grain‐oriented 0.11(Bi0.5K0.5)TiO3–0.23BaTiO3–0.02Bi(Mg0.5Ti0.5)O3–0.64BiFeO3 piezoelectric ceramics were prepared by a reactive templated grain growth method using a platelike H1.08Ti1.73O4·nH2O (HTO) template and Bi2O3–KHCO3–MgO–Fe2O3–BaCO3 matrix particles. The high degree of texturing (a Lotgering orientation factor of 80%) and high density (95%) were achieved by employing weight‐pressing treatment during the binder‐removal and sintering treatment along with optimizing the sintering temperature. The water‐quenching treatment has a significant impact on the enhancement of dielectric, ferroelectric, and piezoelectric properties with the increase of dielectric constant, remanent polarization, and piezoelectric strain constant from 764, 13.6 μC/cm2, and 384 pm/V for the as‐sintered ceramics to 812, 29.9 μC/cm2, and 526 pm/V after the water‐quenching treatment at 850°C, respectively. The obtained piezoelectric strain constant with a 1.8 times enhancement compared to that of the ceramics with randomly oriented grains is significantly higher than those reported for other lead‐free piezoelectric ceramics with Curie temperature >300°C. This study suggested the strong potentiality of this material system for high‐temperature actuator application.
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