Abstract
The 0.74Na1/2Bi1/2TiO3–0.26SrTiO3 codoped with Li2CO3 and B2O3 is studied to develop the low‐temperature sintered lead‐free piezoceramic for multilayer applications. The studied piezoceramics are synthesized by a conventional solid‐state reaction method. Their crystal structures, microstructures, ferroelectrics, and strain properties are analyzed. Interestingly, the addition of Li2CO3 and B2O3 reduces the sintering temperature of the 0.74Na1/2Bi1/2TiO3–0.26SrTiO3 sample from 1175 to 975 °C. All samples show a pseudocubic perovskite structure with a dense microstructure and an inhomogeneous grain size distribution. The electric‐field‐induced polarization loops of the samples are saturated at 4 kV mm−1. More importantly, the 0.74Na1/2Bi1/2TiO3–0.26SrTiO3 + 1 wt%Li2CO3 + 1 wt%B2O3 sample sintered at 975 °C shows a Smax/Emax value of 510 pm/V under an applied electric field of 2 kV mm−1, which is promising for multilayer lead‐free piezoelectric actuator applications.
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