Novel Piezo-active 2–1–2 Composites with Sets of Large Hydrostatic Parameters

AbstractA 2–1–2 composite with two single-crystal components is studied for the first time to highlight large hydrostatic piezoelectric coefficients dh* and gh*, figure of merit dh*gh*, and electromechanical coupling factor kh*. Each 2–1–2 composite contains layers of domain-engineered [011]-poled relaxor-ferroelectric (1–x)Pb(Zn1/3Nb2/3)O3 – xPbTiO3 single crystal (x = 0.0475–0.09) and heterogeneous layers being systems of aligned piezoelectric Li2B4O7 single crystal rods in polyethylene, and these rods have an elliptic cylindrical shape. New diagrams show the volume-fraction ranges wherein large values of dh*> 10−9 C/N, dh*gh*> 2.10−10 Pa−1 and kh*≈ 0.5–0.6 are observed.Keywords: 2–1–2 composite[011]-poled domain-engineered single crystal1–3 composite layerHydrostatic piezoelectric coefficientsElastic anisotropyPACS: 77.84.-s: Dielectricpiezoelectricferroelectricand antiferroelectric materials AcknowledgmentsThe author would like to thank Prof. Dr C. R. Bowen (University of Bath, UK) and Prof. Dr P. Bisegna (University of Rome Tor Vergata, Italy) for their interest in the field of advanced piezoelectric materials and applications.Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research was supported by the Southern Federal University (research topic “Development and Materials-Science Substantiation of the Creation of Materials and Products Based on Piezoelectric Ceramics Using Additive Technologies”, contract No. 176/22-D, July 11th, 2022).