Enhanced piezoelectric properties of PYN-PHT ceramics by LiF addition in low temperature sintering

0.1Pb(Yb0.5Nb0.5)O-3-0.9Pb(Hf0.45Ti0.55)O-3 (PYN-PHT) ceramics with LiF addition were prepared via a solidstate method, and their sintering characteristics and piezoelectric properties were investigated in detail. Results showed that LiF effectively lowered sintering temperature and promoted sintering densification of PYN-PHT ceramics, and that F- doping in PYN-PHT gave rise to phase transition from the tetragonal to rhombohedral, which was beneficial to piezoelectric properties. The PYN-PHT sample exhibited excellent electrical properties, i. e. d(33) = 522 pC/N, T-C = 350 degrees C, epsilon(r) = 1900, tan delta = 0.9%, P-r = 35.4 mu C/cm(2), with a LiF doping content of 0.3% and at a sintering temperature as low as 1050 degrees C. Moreover, the sample possessed better thermal stability, the d(33) of which maintained a high value of 434 pC/N at the depoling temperature of 300 degrees C. This study suggests a novel PHT-based piezoceramic system that can be employed over a broader temperature range for piezoelectric devices. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study prepared LiF-added PYN-PHT ceramics via a solid-state method and found that LiF effectively reduced sintering temperature, promoted densification, and improved piezoelectric properties. The PYN-PHT sample showed excellent electrical properties and thermal stability, suggesting its potential for broader temperature range applications in piezoelectric devices.