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Abstract
The hydrostatic piezoelectricity of Pb ( Mg 1/3 Nb 2/3)–x PbTiO 3 (PMN–xPT) ceramics and PMN–0.32PT and Pb(Mg1/3Nb2/3)–Pb(In1/2Nb1/2)–PbTiO3 (PMN–PIN–PT) crystals were investigated through a quasi-static method. The results showed that pressure-induced depolarization occurred in PMN–xPT ceramics when pressure was above about 50 MPa, while there was no obvious pressure-induced depolarization for PMN–0.32PT and PMN–PIN–PT crystals in the whole pressure range (0~530 MPa). The hydrostatic piezoelectric coefficient d h of PMN–0.32PT and PMN–PIN–PT crystals was nearly independent of pressure. The d h of mono-domain orthorhombic and tetragonal phase crystals is slightly larger, on the order of 100 pC/N. In addition, the relationship between the hydrostatic piezoelectric coefficient d h and the longitudinal and transverse piezoelectric coefficients d33 and d31 for different crystal systems was summarized.
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