Enhanced piezoelectric strain response in 〈100〉 grain‐oriented lead‐free bismuth ferrite–based piezoelectric ceramics. Issue 5 (4th January 2023)

• Record Type: Journal Article
• Authors: Khanal, Gopal Prasad; Fujii, Ichiro; Ueno, Shintaro; Wada, Satoshi
• Is Part Of: Journal of the American Ceramic Society. Volume 106:Issue 5(2023)
• Page Start: 2930
• Page End: 2940
• Publication Date: 2023-01-04
• Subjects: BiFeO3‐based -- 〈100〉 grain orientation -- lead‐free -- piezoelectric strain constant (d33*) -- reactive templated grain growth (RTGG) -- relaxor‐ferroelectrics; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.18963
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: The 〈100〉 grain‐oriented 0.11(Bi0.5 K0.5 )TiO3 –0.23BaTiO3 –0.02Bi(Mg0.5 Ti0.5 )O3 –0.64BiFeO3 piezoelectric ceramics were prepared by a reactive templated grain growth method using a platelike H1.08 Ti1.73 O4 · n H2 O (HTO) template and Bi2 O3 –KHCO3 –MgO–Fe2 O3 –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/cm 2, and 384 pm/V for the as‐sintered ceramics to 812, 29.9 μC/cm 2, 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.