Thermodynamic analysis of electro-optic coefficients of ferroelectrics

The electro-optic coefficients of ferroelectric materials were obtained by Landau thermodynamic theory. It is proved that if the permittivity tensor is diagonal, then some ratios of the electro-optical coefficients are equal to the ratios of its diagonal components. The dependence of electro-optic c...

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Bibliographic Details
Published in:Journal of applied physics 2023-02, Vol.133 (6)
Main Authors: Shirokov, V. B., Timoshenko, P. E., Kalinchuk, V. V.
Format: Article
Language:English
Subjects:
Applied physics
Barium titanates
Coefficients
Dielectric strength
Electric field strength
Ferroelectric materials
Ferroelectricity
Nonlinear response
Single crystals
Tensors
Thermodynamics
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Summary:The electro-optic coefficients of ferroelectric materials were obtained by Landau thermodynamic theory. It is proved that if the permittivity tensor is diagonal, then some ratios of the electro-optical coefficients are equal to the ratios of its diagonal components. The dependence of electro-optic coefficients on the external electric field for single-crystal barium titanate was studied and discussed. It is shown that electro-optic coefficients are rather high for barium titanate due to a non-linear response of dielectric susceptibility to electric field strength.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0137409