Orientation effects in 1-3 composites based on 0.93Pb(Zn1/3Nb2/3)O3- 0.07PbTiO3 single crystals

This paper studies polarisation orientation effects in 1-3 composites with two piezo-active components. It is shown how the orientation of the main crystallographic axes in 0.93Pb(Zn1/3Nb2/3)O 3-0.07PbTiO3 single-crystal rods and the poling direction of a polyvinylidene fluoride matrix affect the volume fraction behaviour of the piezoelectric coefficients, squared figure of merit and hydrostatic parameters of the composites. For a fixed orientation, effective parameters calculated using the matrix approach are compared with those evaluated by the finite element method. Possible property advantages concerned with orientation effects, maxima of effective parameters and high performance of these composites are analysed taking into consideration the electromechanical properties of the components.