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Erschienen in:
2018 | OriginalPaper | Buchkapitel
5. Piezoelectric Coefficients \(\varvec{h}_{\varvec{ij}}^{\varvec{*}}\): New Opportunities to Improve Sensitivity
verfasst von : Vitaly Yu. Topolov, Christopher R. Bowen, Paolo Bisegna
Erschienen in: Piezo-Active Composites
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Abstract
Piezoelectric coefficients hij characterise a link between an external mechanical strain applied to a sample and an electric field caused by the direct piezoelectric effect. At the converse piezoelectric effect, the piezoelectric coefficients hij characterise the link between a mechanical stress in the sample and electric displacement. Examples of the volume-fraction behaviour of the effective piezoelectric coefficients \(h_{ij}^{*}\) and the piezoelectric sensitivity associated with \(h_{ij}^{*}\) are analysed for the 2–2-type, 1–3-type and 0–3-type composites based on ferroelectrics. Relations between the piezoelectric coefficients \(h_{ij}^{*}\) and \(e_{ij}^{*}\) and some cases of the large anisotropy of \(h_{3j}^{*}\) are discussed for some composites.