LAUSR

Abstract 0.6(Na0.5Bi0.5)TiO3-0.4(Bi1-ySry)TiO3 ceramics (abbreviated BNT-BSyT, y = 0.2, 0.3, 0.5, 0.7, and 0.9 mol) were fabricated using a traditional solid-state processing route, and the effects of Sr2+ on phase structure, di- and ferroelectric properties, and electrostrictive properties were systematically investigated. The values of γ for BNT-BSyT ceramics are greater than 1.8, revealing that these materials exhibit relaxor ferroelectric properties derived from the co-occupation of Bi3+, Na+, and Sr2+ in the A-site and inhomogeneous polarization states (i.e., coexistence of rhombohedral and tetragonal states). In addition, Td decreases with increasing Sr2+ content along with a stable and increased tetragonal phase. BNT-BS0.9T ceramic has a slightly large maximum polarization Pmax = 16.15 μC/cm2, a small remanent polarization Pr = 1.6 μC/cm2, and a relatively good energy storage property (density W1 = 0.220 J/cm3 and efficiency η = 72.13%), indicating that Sr2+ substitution helps to promote energy storage characteristics. Moreover, there is a superior electrostrictive coefficient (Q33 = 0.0385 m4/C2) for BNT-BS0.3T ceramic. Therefore, we propose that this lead-free electrostrictor is a good candidate for practical applications.