화학공학소재연구정보센터
Materials Chemistry and Physics, Vol.151, 187-195, 2015
New orientation effect in piezo-active 1-3-type composites
This paper demonstrates the influence of the mutual orientation of the poling direction of single-crystal and ceramic components on the properties of 1-0-3 composites containing two ferroelectric components and a piezo-passive polymer. Effective properties to be considered are hydrostatic piezoelectric performance, anisotropy of squared figures of merit and electromechanical coupling factors. We demonstrate that the elastic and piezoelectric anisotropy of the 0-3 connectivity ferroelectric ceramic/polymer matrix with prolate inclusions leads to large hydrostatic piezoelectric coefficients (d(h)* and g(h)*) and squared figure of merit (d(h)*g(h)*) in a 1-0-3 0.67Pb(Mg1/3Nb2/3)O-3-0.33PbTiO(3) single crystal/(Pb1-xCax)TiO3 ceramic/araldite composite with x = 0.20-0.25. In this type of composite values of maxg(h)* similar to 10(2) mV m/N and max(d(h)*g(h)*) similar to 10(-11) Pa-1 are achieved at specific volume-fraction and rotation-angle ranges due to a new orientation effect in the presence of a highly anisotropic 0-3 matrix. Such composites are of interest for sensor, actuator and energy-harvesting applications. (C) 2014 Elsevier B.V. All rights reserved.