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Relation of the Hydrostatic Electrostrictive Coefficient of Cubic Dielectrics with other Material Constants
Author(s) -
Kloos G.
Publication year - 1996
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170310615
Subject(s) - electrostriction , polarizability , dielectric , hydrostatic pressure , hydrostatic equilibrium , compressibility , thermodynamics , symmetry (geometry) , chemistry , ionic bonding , sign (mathematics) , alkali metal , condensed matter physics , materials science , physics , mathematical analysis , quantum mechanics , ion , mathematics , composite material , geometry , organic chemistry , molecule , piezoelectricity
A simple relation is derived that links the hydrostatic coefficient of quadratic electrostriction with the volume compressibility and an expression involving the dielectric constant. The first part of the derivation is mainly macroscopic and applicable to dielectrics with cubic symmetry. Making use of the Born‐Mayer potential, an expression of the derivative of the ionic polarizability with respect to volume is given in the second part. A negative sign of the hydrostatic coefficient is predicted for typical alkali halides. This result is in agreement with recent experimental findings reported in the literature, if the observed values are corrected for the influence of electrostatic stresses in an alternative way.