Achieving both large transduction coefficient and high Curie temperature of Bi and Fe co-doped PZT piezoelectric ceramics

Abstract

Achieving both the large transduction coefficient (the product of piezoelectric charge d 33 and voltage coefficients g 33 ) and high Curie temperature is very important to improve the power generation performance and their thermal stability of piezoelectric energy harvesters. It is difficult to improve the transduction coefficient of the commercial PZT based piezoelectric ceramics due to the same variation trend of piezoelectric charge coefficient and dielectric constant with chemical modifications. In this work, Bi 2 O 3 and Fe 2 O 3 co-modified ((Pb 1-x Bi x )((Zr 0.53 Ti 0.47 ) 1-x Fe x )O 3 ) ceramics were prepared by conventional solid state reaction method, and their dielectric and piezoelectric properties were studied. The piezoelectric charge coefficient d 33 increases by Bi and Fe co-modifications due to the enlarged grain size and reduced lattice distortion, while the dielectric constant ε 33 deceases mainly owing to the increased micro-pores in grains, leading to the enhancement transduction coefficient d 33 × g 33 . The Curie temperature T c and maximum transduction coefficient d 33 × g 33 are 346 °C and 17169 × 10 −15 m 2 /N, respectively, which are both higher than those of commercial PZT and PZN-PZT based piezoelectric ceramics. This work provides a new way to enhance the transduction coefficient of PZT based ceramics for piezoelectric energy harvesters used in wide temperature range.