Abstract
The temperature dependence of elastic, dielectric, and piezoelectric properties of (65−x)[Pb(Mg1/3Nb2/3)O3]–xBaTiO3-35PbTiO3 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.
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