CaBi 2 Nb 2 O 9 ( CBN )‐based high Curie temperature piezoelectric ceramics with formula Ca 0.8‐ x Sr x (Li 0.5 Ce 0.15 Bi 0.35 ) 0.2 Bi 2 Nb 1.94 Ta 0.04 W 0.02 O 9 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 Sr 2+ 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 T C and good resistance to thermal depolarization. The analysis of dielectric spectrums revealed that the space charge polarization induced an additional dielectric anomaly occurred below T C . The composition with x = 0.025 showed good integrated performance, the piezoelectric coefficient d 33 and T C were ~17.5 pC/N and ~917°C, respectively. Even though the as‐studied ceramics underwent high depolarizing temperature reached up to 875°C, d 33 decreased by 8% merely. The remanent polarization 2 P r and the resistivity ρ at 650°C were on the order of ~10 μC/cm 2 and 3 × 10 5 Ω cm, respectively.
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Xie et al. (2018) studied this question.
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