Abstract
Some lead-free piezoelectrics cannot meet the requirement for application in extremely harsh high-temperature surroundings. In this work, an enhanced piezoelectric performance with high piezoelectric coefficient (d33) and high Curie temperature (Tc) has been achieved by replacing the Ti4+ with the Co3+ in Na0.5Bi4.46Ce0.04Ti4-xCoxOy ceramics. The introduction of Co3+ decreases the B–O bond lengths, leading to the shrinkage of BO6 octahedra and lattice volume. The electron localization degree of B–O bond and the polarity of the BO6 octahedra were improved by diminution of lattice volume concomitantly, which were indicated by the first principle calculations. Therefore, an enhanced piezoelectric coefficient of 22 pC/N and high Tc of 690.2 °C have been realized in Na0.5Bi4.46Ce0.04Ti4-xCoxOy ceramics with x = 0.02 mol. Our work gives a good paradigm to design superhigh temperature piezoelectric devices for practical application in extremely harsh circumstances.
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