Piezoelectric and pyroelectric coefficients for ferroelectric crystals with polarizable molecules
- 15 October 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 26 (8) , 4564-4570
- https://doi.org/10.1103/physrevb.26.4564
Abstract
Expressions for piezoelectric and pyroelectric coefficients for a crystal of polarizable point dipoles are derived. The effect of crystal structure on the local electric field acting to polarize the molecules is included via the Lorentz-factor formalism. The derived expressions for the piezo- and pyroelectric coefficients are found to contain terms dependent on derivatives of the Lorentz factors. These terms reflect the changing of molecular dipole moments in response to the changing local electric field in the strained crystal. Inclusion of this effect results in predictions of coefficients substantially different from those obtained using the Lorentz field approximation.Keywords
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