Abstract
A 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.
Acknowledgments
The 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 Statement
No potential conflict of interest was reported by the author(s).