The hydrostatic piezoelectric properties of [011] poled Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) crystals and corresponding 2-2 crystal/epoxy composites were investigated.The crystal volume ratio and compositional dependencies of the hydrostatic charge and voltage coefficients (d h and g h ) and hydrostatic figure of merit (FOM) d h  g h were determined, where large FOM value of 3.2 pm 2 /N with high stability as a function of hydrostatic pressure was achieved for rhombohedral crystal composites.In addition, the stress amplification effects of the face-plate and different epoxy matrixes were investigated, with maximum FOM value being on the order of 92 pm 2 /N, indicating that 2-2 crystal/epoxy composites are promising materials for hydrostatic applications.
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Li et al. (2014) studied this question.
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