Large and temperature-independent piezoelectric response in Pb(Mg1/3Nb2/3)O3-BaTiO3-PbTiO3

TL;DR

This study investigates the temperature stability of piezoelectric properties in a specific lead-based ceramic, revealing a composition with a notably stable and high piezoelectric response over a broad temperature range.

Contribution

It demonstrates that BaTiO3 doping in Pb(Mg1/3Nb2/3)O3-PbTiO3 ceramics results in a large, temperature-independent piezoelectric response, which is a novel finding.

Findings

Large piezoelectric response (d31=-170 pC/N, d33=530 pC/N) at 300 K.

Piezoelectric response remains nearly constant from 185 to 360 K.

Broad ferroelectric phase transition influenced by BaTiO3 doping.

Abstract

The temperature dependence of elastic, dielectric, and piezoelectric properties of (65-x)Pb(Mg1/3Nb2/3)O3-xBaTiO335-PbTiO3 ceramics with x=0, 1, 2, 3, and 4 was investigated. Compound with x=2 was found to exhibit a large piezoelectric response (d31=-170 pC/N, d33=530 pC/N at 300 K). Particularly, its d31 value was nearly a constant over a temperature range from 185 to 360 K. A broad ferroelectric phase transition tuned by BaTiO3 doping was deduced from the dielectric constant, elastic compliance constant and Raman spectra. The temperature-stable piezoelectric response was attributed to the counter-balance of contributions from the dielectric and elastic responses.