Abstract
AbstractCaBi2Nb2O9 (CBN)‐based high Curie temperature piezoelectric ceramics with formula Ca0.8‐xSrx(Li0.5Ce0.15Bi0.35)0.2Bi2Nb1.94Ta0.04W0.02O9 were prepared by conventional solid‐state reaction method. The effects of strontium substitution for calcium in CBN pseudo‐perovskite structure A‐site were systematically studied. Results showed that the addition of Sr2+ ions lead to an improvement of the tetragonality of lattice structure, which resulted in an enhancement of piezoelectric and ferroelectric properties together with high Curie temperature TC and good resistance to thermal depolarization. The analysis of dielectric spectrums revealed that the space charge polarization induced an additional dielectric anomaly occurred below TC. The composition with x = 0.025 showed good integrated performance, the piezoelectric coefficient d33 and TC were ~17.5 pC/N and ~917°C, respectively. Even though the as‐studied ceramics underwent high depolarizing temperature reached up to 875°C, d33 decreased by 8% merely. The remanent polarization 2Pr and the resistivity ρ at 650°C were on the order of ~10 μC/cm2 and 3 × 105 Ω cm, respectively.
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