Features of electromechanical properties of 1-3 composites based on PbTiO3-type ceramics

This work is devoted to the comparative study on 1-3 ferroelectric ceramic/polymer composites based on solid solutions of (Pb1-xCax)TiO3 with 0.10 <= x <= 0.30. Effective electromechanical properties of these composites are determined in a volume fraction range 0 < m <= 0.60 by means of the effective field method, the finite element method and using the dilute approach. The computed effective properties are compared and discussed for the case when the ( Pb1-xCax) TiO3 ceramic component exhibits the largest piezoelectric anisotropy at 0.10 <= x <= 0.30. Rigorous lower and upper bounds on the effective electromechanical properties are evaluated on the basis of the approach developed by Bisegna and Luciano (1996 J. Mech. Phys. Solids 44 583)

Electromechanical coupling and its anisotropy in a novel 1–3–0 composite based on single-domain 0.58Pb(Mg1/3Nb2/3)O3–0.42PbTiO3 crystal

The anisotropic piezo-active composite with 1–3–0 connectivity is studied to show features of the piezoelectric response and electromechanical coupling at variations of microgeometric characteristics of the composite matrix. A system of the anisotropy factors is analysed for the single-domain 0.58Pb(Mg1/3Nb2/3)O3–0.42PbTiO3 crystal/porous polyurethane composite wherein the porosity and aspect ratio of pores are varied. Examples of extreme of electromechanical coupling factors and their anisotropy factors are analysed. The important role of the piezoelectric anisotropy factor of the composite and the elastic anisotropy of the porous polymer matrix is emphasised in connection with the non-monotonic volume-fraction dependence of some effective parameters of the composite and with large ratios of its electromechanical coupling factors ( and ). Some advantages of this anisotropic 1–3–0 composite over the conventional highly anisotropic PbTiO3-type ceramics are discussed

Performance of novel piezo-active alpha-beta composites based on relaxor-ferroelectric single crystals

This work simulates the electromechanical properties and related parameters of 0.67Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 single crystal / polymer composites with 0–3, 1–3 and 2–2 connectivities. Advantages in performance are related to the presence of the highly piezo-active component. Comparison of results for 0–3 connectivity is made

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)O3-0.07PbTiO3 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