2–2 composites based on [011]-poled relaxor-ferroelectric single crystals: Analysis of the piezoelectric anisotropy and squared figures of merit for energy harvesting applications

C. R. Bowen, D. N. Betts, H. A. Kim, V. Yu. Topolov

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3 Citations (Scopus)
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Abstract

In this paper we explore the effect of the orientation of the main crystallographic axes in relaxor-ferroelectric single crystals (SCs) on the piezoelectric anisotropy and squared figures of merit of 2-2 parallel-connected SC/auxetic polymer composites. The single-crystal component for the composite is chosen from the perovskite-type solid solutions with compositions near the morphotropic phase boundary and poled along the perovskite unit-cell [011] direction (mm 2 symmetry of domain-engineered SCs). The orientation of the main crystallographic axes in the single-crystal component is observed to strongly influence the piezoelectric coefficients d3j* squared figures of merit d3j* g3j* electromechanical coupling factors k3j* and hydrostatic analogs of these parameters of the 2-2 composite. Inequalities | d33*/ d 3f*| > 5 and | k33*/ k3f*| > 5 (f = 1 and 2) are achieved at specific orientations of the main crystallographic axes due to the significant anisotropy of the elastic and piezoelectric properties of the single-crystal component. The use of an auxetic polyethylene (a polymer component with a negative Poisson's ratio) leads to a significant increase in the hydrostatic parameters. Particular advantages of such composites over conventional ceramic/polymer composites are taken into account for transducer, hydroacoustic, energy harvesting, and other applications.
Original languageEnglish
Pages (from-to)709-717
Number of pages9
JournalMicrosystem Technologies
Volume20
Issue number4-5
Early online date7 Dec 2013
DOIs
Publication statusPublished - 30 Apr 2014

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  • Projects

  • Energy Harvesting

    Kim, A. & Bowen, C.

    Engineering and Physical Sciences Research Council

    26/01/1225/07/15

    Project: Research council

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