Anisotropy Factors and Electromechanical Coupling in Lead-Free 1-3-Type Composites

Vitaly Yu Topolov; Christopher R. Bowen; Ashura N. Isaeva

doi:10.1109/TUFFC.2018.2833856

Anisotropy Factors and Electromechanical Coupling in Lead-Free 1-3-Type Composites

Vitaly Yu Topolov, Christopher R. Bowen, Ashura N. Isaeva

Department of Mechanical Engineering

Southern Federal University

Research output: Contribution to journal › Article › peer-review

9 Citations (SciVal)

111 Downloads (Pure)

Abstract

The effective electromechanical properties and anisotropy factors of novel lead-free 1-3-type composites are studied to demonstrate their large piezoelectric anisotropy and considerable level of electromechanical coupling. The composites studied contain two single-crystal (SC) components and a polymer component. The first piezoactive component is a domain-engineered [001]-poled SC based on ferroelectric alkali niobates-tantalates, and this component is in the form of a system of long rods that are parallel to the poling axis OX ₃. The second SC component is a system of spheroidal piezoelectric Li ₂B ₄O ₇ inclusions aligned in a continuous and relatively large polymer matrix. The SC rods are surrounded by an SC/polymer matrix, and the connectivity of the composite is 1-0-3. It is shown that the conditions d ₃₃/d ₃₁ ≥5, which indicates a large degree of anisotropy of the piezoelectric coefficients, and k ₃₃/k ₃₁ ≥5 and k _t/k _p\ ≥ 5, which indicate a large anisotropy of the electromechanical coupling factors (ECFs), can be achieved simultaneously in specific ranges of the component volume fractions and inclusion aspect ratios. Moreover, in the same volume-fraction and aspect-ratio ranges, large ECFs (k ₃₃ k _t\ ∼0.8-0.9) are also achieved. In this context, the important role of the elastic properties of the continuous anisotropic matrix is discussed. The properties and anisotropy factors of the lead-free 1-3-type composites are compared to the similar parameters of conventional lead-containing piezoelectric materials, and the advantages of the composite system studied are described.

Original language	English
Pages (from-to)	1278-1286
Number of pages	9
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	65
Issue number	7
Early online date	11 May 2018
DOIs	https://doi.org/10.1109/TUFFC.2018.2833856
Publication status	Published - 1 Jul 2018

Keywords

Ferroelectric materials
ferroelectric properties
piezoelectric and ferroelectric transducer materials

ASJC Scopus subject areas

Instrumentation
Acoustics and Ultrasonics
Electrical and Electronic Engineering

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10.1109/TUFFC.2018.2833856

Topolov-Bow-Is-IEEE-TUFFC-2018
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title = "Anisotropy Factors and Electromechanical Coupling in Lead-Free 1-3-Type Composites",

abstract = "The effective electromechanical properties and anisotropy factors of novel lead-free 1-3-type composites are studied to demonstrate their large piezoelectric anisotropy and considerable level of electromechanical coupling. The composites studied contain two single-crystal (SC) components and a polymer component. The first piezoactive component is a domain-engineered [001]-poled SC based on ferroelectric alkali niobates-tantalates, and this component is in the form of a system of long rods that are parallel to the poling axis OX 3. The second SC component is a system of spheroidal piezoelectric Li 2B 4O 7 inclusions aligned in a continuous and relatively large polymer matrix. The SC rods are surrounded by an SC/polymer matrix, and the connectivity of the composite is 1-0-3. It is shown that the conditions d 33/d 31 ≥5, which indicates a large degree of anisotropy of the piezoelectric coefficients, and k 33/k 31 ≥5 and k t/k p\ ≥ 5, which indicate a large anisotropy of the electromechanical coupling factors (ECFs), can be achieved simultaneously in specific ranges of the component volume fractions and inclusion aspect ratios. Moreover, in the same volume-fraction and aspect-ratio ranges, large ECFs (k 33 k t\ ∼0.8-0.9) are also achieved. In this context, the important role of the elastic properties of the continuous anisotropic matrix is discussed. The properties and anisotropy factors of the lead-free 1-3-type composites are compared to the similar parameters of conventional lead-containing piezoelectric materials, and the advantages of the composite system studied are described. ",

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Anisotropy Factors and Electromechanical Coupling in Lead-Free 1-3-Type Composites

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