Abstract

The piezoelectric effect in novel 1–3-type composites with lead-free components is studied in terms of the effective piezoelectric coefficients d3j* and g3j*, electromechanical coupling factors k3j* and anisotropy factors d33* / d31* and k33* / k31*. The piezoelectric component is either a domain-engineered [001]-poled single crystal or a poled ceramic, and both the single crystal and ceramic are based on ferroelectric alkali-niobate—alkali-tantalate solid solutions. In the studied composites this component represents a system of long rods that are oriented parallel to the poling axis OX3, and the rods are surrounded by a large piezo-passive polymer matrix that can be either monolithic (in 1–3 composites) or porous (in 1–3–0 composites). The high level of piezoelectric sensitivity of the lead-free 1–3 and 1–3–0 composites is noted due to the longitudinal piezoelectric coefficient g33* ~ 102–103 mV.m / N. Conditions for a large anisotropy d33∗ / | d31∗ | = g33* / | g31* | ≥ 5 and k33* / | k31* | ≥ 5 are valid in specific volume-fraction ranges of the ferroelectric component and porosity in the polymer component. The important role of the pore shape in achieving the large anisotropy of d3j* and k3j* of the 1–3–0 composite is discussed. The studied 1–3-type composites are of interest for the selection of advanced piezoelectric materials for transducer, sensor and related applications, with additional respect to the environment due to the lead-free nature of the composite components.

Original languageEnglish
Title of host publicationSpringer Proceedings in Materials
Place of PublicationU. S. A.
PublisherSpringer Nature
Pages161-176
Number of pages16
ISBN (Electronic)9783030764814
ISBN (Print)9783030764807
DOIs
Publication statusE-pub ahead of print - 11 Aug 2021

Publication series

NameSpringer Proceedings in Materials
Volume10
ISSN (Print)2662-3161
ISSN (Electronic)2662-317X

Keywords

  • Anisotropy factor
  • Composite
  • Lead-free
  • Piezoelectric coefficient
  • Piezoelectric sensitivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Renewable Energy, Sustainability and the Environment

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