Enhanced temperature stability in high piezoelectric performance of (K, Na)NbO3-based lead-free ceramics trough co-doped antimony and tantalum

Although KNN-based ceramics with high electric performance have been obtained by phase engineering strategy, the temperature stability is required to be the improved in the applications. Herein, a new environment-friendly 0.96K(0.4)Na(0.6)Nb(0.97-x)Ta(0.03)Sb(x)O(3)-0.04(Bi0.45Sm0.05)Na0.5ZrO3 (KNNTSx-BSNZ, x = 0 -0.08) ceramic system was designed, which exhibits excellent piezoelectric properties and good temperature stability. A high piezoelectric property of 510 pC/N is obtained by R-T phase engineering in the ceramics with x = 0.045. The temperature stability of electric properties is improved in the temperature range of T = 20-180 degrees C by Ta, Sb co-doping in KNNTSx-BSNZ ceramics with x = 0.02-0.045, benefiting from the combined effects of both the enhanced relaxor behavior and high T-C. Therefore, we believe that it can broaden the application of KNN-based ceramics. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

By phase engineering and co-doping with Ta and Sb, the piezoelectric performance and temperature stability of KNNTSx-BSNZ ceramics have been improved, expanding the application potential of KNN-based ceramics.