Dielectric, Ferroelectric, and High-Temperature Strain Behavior of Rare Earth Ce-Doped 0.67BiFeO3–0.33BaTiO3 Lead-Free Ferroelectric Ceramics Dielectric, Ferroelectric, and High-Temperature Strain Behavior of Rare Earth Ce-Doped 0.67BiFeO3–0.33BaTiO3 Lead-Free Ferroelectric Ceramics AITranslate

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DOI：https://doi.org/10.1021/acsaelm.3c01361

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A Ce4+-substituted 0.67BiFeO3–0.33BaTiO3 lead-free ceramic system was systematically investigated. The results indicate that all samples exhibit the coexistence of rhombohedral phase and pseudocubic phase. Dielectric measurements indicate that with the doping of Ce4+, the ferroelectric phase gradually transferred to the relaxor phase. The addition of an appropriate number of Ce4+ ions led to a larger grain size of the BiFeO3–BaTiO3 (BF–BT) ceramics, a lower Fe2+ content, and higher resistivity. At a Ce4+ concentration (x) of 0.3 mol %, the BF–BT–xCe ceramic exhibited excellent dynamic piezoelectric coefficients (d33* = 406 pm/V) and a high Curie temperature of 418.2 °C. Furthermore, the d33* (406 pm/V) at room temperature of BF–BT–0.003Ce significantly increased to 759 pm/V at 125 °C. The enhanced field-induced strain performance of the ceramics is attributable to lattice distortion induced by Ce4+ doping. The temperature-dependent behavior of the field-induced strain in the BF–BT–Ce ceramics was enhanced by thermally induced domain switching. This study confirms the potential of the investigated BF–BT–Ce ceramics as promising lead-free, environmentally friendly, and high-temperature piezoelectric material.