Improvements of depolarization temperature, piezoelectric and energy harvesting properties of BNT-based ceramics by doping an interstitial dopant

An important problem of many BNT-based perovskite piezoelectric materials for real applications is to increase and/or to disappear the depolarization temperature (T-d) as well as to achieve high piezoelectric properties. Many previous works, through various techniques, have tried to shift up the T-d and also enhance piezoelectric properties. In the present work, we report an alternative way to increase the T-d by using a boron oxide (B2O3) additive, where the boron ion in B2O3 is an interstitial dopant. The increase of T-d is proposed to relate with an internal stress formation in the ceramic, due to the doping effect. Furthermore, improvements of remanent polarization (P-r), piezoelectric properties, loss tangent value and energy harvesting performance of the ceramics are also enhanced for the doped samples. (C) 2021 Published by Elsevier B.V.