Novel High-Sensitivity Composites Based on Ferroelectric Ceramics

Abstract

The structure of a high-sensitivity 1–3-type composite is studied. The effect of the anisotropy of elastic moduli of the 0–3 matrix on piezoelectric sensitivity, hydrostatic piezoelectric coefficient and anisotropy of electromechanical coupling factors is analysed. Effective parameters are predicted and analysed for the 1–0–3 composite based on modified lead titanate ceramic. The large values of piezoelectric coefficients g*₃₃ ≈ 400 mV^.m/N and g* _h ≈ 200 mV^.m/N and the considerable anisotropy of electromechanical coupling factors (k*₃₃/k*₃₁ ≈ –15, k* _t /k* _p ≈ –9) of the studied composite are discussed.

Keywords:

• Composite
• ferroelectric ceramic
• piezoelectric sensitivity
• piezoelectric anisotropy

Keywords:

• PACS: 77.65.-j: Piezoelectricity and electromechanical effects; 77.84.Lf: Composite materials; 77.84.-s: Dielectric
• piezoelectric
• ferroelectric
• and antiferroelectric materials

Acknowledgments

The authors would like to thank Prof. Dr. R. Stevens (University of Bath, UK), Prof. Dr. A.E. Panich and Prof. Dr. I.A. Parinov (Southern Federal University, Russia), and Prof. Dr. P. Bisegna (University of Rome “Tor Vergata”, Italy) for their continued interest in the research problem.

Notes

At room temperature the modified PbTiO₃ FC is characterised [5] by elastic moduli c^E ₁₁ = 14.33, c^E ₁₂ = 3.220, c^E ₁₃ = 2.413, c^E ₃₃ = 13.16, and c^E ₄₄ = 5.587 (in 10¹⁰ Pa), piezoelectric coefficients e ₃₁ = 0.4584, e ₃₃ = 6.499 and e ₁₅ = 5.923 (in C/m²), g ₃₃ = 32.56 mV^.m/N, and dielectric permittivities ϵ^ξ ₁₁/ϵ ₀ = 210 and ϵ^ξ ₃₃/ϵ ₀ = 140.