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

Abstract

A 2–1–2 composite with two single-crystal components is studied for the first time to highlight large hydrostatic piezoelectric coefficients d_h* and g_h*, figure of merit d_h*g_h*, and electromechanical coupling factor k_h*. Each 2–1–2 composite contains layers of domain-engineered [011]-poled relaxor-ferroelectric (1–x)Pb(Zn_1/3Nb_2/3)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 d_h*> 10⁻⁹ C/N, d_h*g_h*> 2^.10⁻¹⁰Pa⁻¹ and k_h*≈ 0.5–0.6 are observed.

Keywords:

• 2–1–2 composite
• [011]-poled domain-engineered single crystal
• 1–3 composite layer
• Hydrostatic piezoelectric coefficients
• Elastic anisotropy

PACS:

•  77.84.-s: Dielectric
• piezoelectric
• ferroelectric
• and antiferroelectric materials

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).

Additional information

Funding

This 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).