Improving the piezoelectric properties of CBN‐based ceramic by a Ce ion

Abstract

AbstractCaBi2Nb2O9 (CBN), one of the bismuth‐layered structural ferroelectrics, with high Curie temperature (TC), has great potential in high‐temperature applications. In this work, high Curie temperature and piezoelectric constant (d33) are realized in modified CaBi2Nb2O9 ceramics with Ce‐substitution. Ce‐substitution changes the crystal structures and domain structures of CBN‐based ceramics, so as to improve the piezoelectric properties. The optimal performances are obtained with a high d33 value (∼18.0 pC/N) and a TC value (∼930°C), together with a low tan δ value (∼0.028 at 500°C). Moreover, the thermal stability is also enhanced, where the d33 value maintains 93.9% of its original value after annealing at 900°C for 2 h. Thus, these findings play a meaningful role in devices manufacturing, where the apply temperature is often more than 500°C.