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

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

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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 languageEnglish
Pages (from-to)1278-1286
Number of pages9
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume65
Issue number7
Early online date11 May 2018
DOIs
Publication statusPublished - 1 Jul 2018

Fingerprint

Electromechanical coupling
Anisotropy
Lead
Single crystals
anisotropy
composite materials
Composite materials
single crystals
Polymer matrix
Aspect ratio
Volume fraction
aspect ratio
polymers
rods
matrices
inclusions
Piezoelectric materials
niobates
Ferroelectric materials
Large scale systems

Keywords

  • Ferroelectric materials
  • ferroelectric properties
  • piezoelectric and ferroelectric transducer materials

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

Cite this

Anisotropy Factors and Electromechanical Coupling in Lead-Free 1-3-Type Composites. / Topolov, Vitaly Yu; Bowen, Christopher R.; Isaeva, Ashura N.

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 65, No. 7, 01.07.2018, p. 1278-1286.

Research output: Contribution to journalArticle

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