Erkoreka, A. orcid.org/0000-0003-1717-3226, Martinez-Perdiguero, J. orcid.org/0000-0002-9155-6279, Mandle, R.J. orcid.org/0000-0001-9816-9661 et al. (2 more authors) (Cover date: 1 October 2023) Dielectric spectroscopy of a ferroelectric nematic liquid crystal and the effect of the sample thickness. Journal of Molecular Liquids, 387. 122566. ISSN 0167-7322
Abstract
The recently discovered ferroelectric nematic liquid crystals have been reported to exhibit very large dielectric permittivity values. Here, we report a systematic investigation of the dielectric behavior of a prototypical ferroelectric nematogen by varying the thickness of the parallel capacitor measuring cell. While in the non-polar high temperature nematic phase results show only slight differences due to slight variations of the alignment, the measured permittivity values in the ferroelectric nematic phase show a linear dependence on the cell thickness. It is also shown that the characteristic relaxation frequency decreases inversely proportionally to the thickness. The results are discussed in terms of three different available models based on different underlying mechanisms, accounting for cancellation of the probe electric fields by polarization reorientation or by ionic charges, or based on a recently proposed continuous phenomenological model.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). |
Keywords: | Dielectric spectroscopy, Liquid crystals, Relaxation phenomena, Ferroelectric nematic phase |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Soft Matter Physics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Aug 2023 09:09 |
Last Modified: | 09 Aug 2023 09:09 |
Published Version: | https://www.sciencedirect.com/science/article/pii/... |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.molliq.2023.122566 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:202166 |
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