Hydrostatic Piezoelectric Coefficients of the 2-2 Composite Based on 011 -poled 0.71Pb(Mg1/3Nb2/3)O-3-0.29PbTiO(3) Single Crystal

The effect of the polarisation orientation of [011]-poled polydomain PMN-0.29PT single crystal on the hydrostatic piezoelectric coefficients d(h)* and e(h)* of a parallel-connected 2-2 composite has been analysed. Orientation and volume-fraction dependences of the piezoelectric coefficients of the 2-2 PMN-0.29PT/polymer composite have been studied to determine extreme points of d(h)* and e(h)* in three cases of rotations of the main crystallographic axes of the PMN-0.29PT single crystal. The largest values of the hydrostatic piezoelectric coefficients vertical bar d(h)*vertical bar = 444 pC/N and e(h)* = 33.1 C/m(2) are of interest for hydroacoustic applications. Important contributions from the piezoelectric coefficients d(3j)* and e(3j)* into d(h)* and e(h)*, respectively, have been determined near the extreme points of the hydrostatic parameters.