Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5447774 | Materials Chemistry and Physics | 2017 | 11 Pages |
Abstract
This paper reports the piezoelectric performance and important related hydrostatic parameters of 2-0-2 composites based on lead-free ferroelectric and piezoelectric single crystals with 4mm symmetry. We demonstrate that ferroelectric domain-engineered alkali niobate-tantalate based single crystals provide large values of the piezoelectric coefficients g3jâ and related parameters when used in a 2-0-2 composite system with a relatively wide range of volume fractions of single-crystal components. An 'aspect-ratio effect' as a result of the presence of inclusions of a piezoelectric Li2B4O7 single crystal in a polymer medium is studied for the first time for a case where the elastic compliance s12 in the single crystal/polymer layer of the composite passes through zero. It is observed that changes in the aspect ratio and volume fraction of the Li2B4O7 inclusions influence the hydrostatic piezoelectric coefficient ghâ, squared figure of merit dhâghâ and electromechanical coupling factor khâ of the composite, and large values of ghââ¼102 mV·m/N, dhâghââ¼ (10â11-10â10) Paâ1 and khââ 0.6-0.7 are achieved. A link between max khâ and a change in sgns12 is first described for the 2-2-type composite, and a comparison of the hydrostatic parameters of the novel and related composites is made. The present results show the potential of lead-free 2-0-2 composites that are suitable for piezoelectric sensor, energy-harvesting and hydroacoustic applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
V. Yu. Topolov, C.R. Bowen, A.A. Panich, A.N. Isaeva,