Dielectric method for determining the electrical critical field in ferroelectric liquid crystalsReport as inadecuate




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Abstract : Both the electrical field and the dielectric constant ε0 ΔεG associated with the Goldstone mode in the ferroelectric liquid crystals are related to the helical pitch. A direct relation between these two physical quantities is established. We have calculated the electrical critical field for both DOBAMBC and DOBA-1-MPC compound from the measured temperature variation of ε0 ΔεG and polarization without any adjustable parameter. Just below the transition temperature region, the results obtained agree qualitatively with the experimental data. Away from the transition temperature, there exist systematic deviations.





Author: A. Levstik Z. Kutnjak B. Zeks S. Dumrongrattana C. Huang

Source: https://hal.archives-ouvertes.fr/



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