Piezoelectric sensitivity and hydrostatic response of novel lead-free 2–0–2 composites with two single-crystal components

V Yu Topolov, C. R. Bowen, A A Panich, A. N. Isaeva

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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 g3j 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 gh , squared figure of merit dh gh and electromechanical coupling factor kh of the composite, and large values of gh ∼102 mV·m/N, dh gh ∼ (10−11–10−10) Pa−1 and kh ≈ 0.6–0.7 are achieved. A link between max kh 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.

Original languageEnglish
Pages (from-to)224-234
Number of pages11
JournalMaterials Chemistry and Physics
Early online date19 Aug 2017
Publication statusPublished - 1 Nov 2017


  • Elastic properties
  • Hydrostatic parameters
  • Piezo-active composite
  • Piezoelectric properties
  • Single crystal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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