| Title: | Ferroelectric nematics: materials with high permittivity or low resistivity? |
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| Authors: | ID Vaupotič, Nataša (Author)
ID Krajnc, Tine (Author)
ID Górecka, Ewa (Author)
ID Pociecha, Damian (Author)
ID Matko, Vojko (Author) |
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| Files: |  Ferroelectric_nematics__materials_with_high_permittivity_or_low_resistivity_.pdf (5,83 MB)
MD5: 0C95E42B09D9AE0B8A4227EA7332C4C8
 https://www.tandfonline.com/doi/full/10.1080/02678292.2025.2484234#abstract
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FERI - Faculty of Electrical Engineering and Computer Science
FNM - Faculty of Natural Sciences and Mathematics
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| Abstract: | Two models have recently been proposed to describe dielectric spectroscopy measurements of ferroelectric nematics (NF) in thin planar capacitors. The polarisation-external capacitance Goldstone reorientation mode (PCG model) considers the NF layer between the electrodes as an effective low resistivity material; the resistivity is inversely proportional to the square of polarisation magnitude. The ‘high-ε’ model considers the NF material as having a huge permittivity due to the ease of polarisation rotation. We study implications of both models and show, why both models describe the majority of the observed dielectric spectroscopy results equally well. We point out differences among the models’ predictions and explain why some observations can be explained only by the high-� model. The high-� model predicts that the frequency range within which capacitors filled with NF material effectively store energy can be increased by using thicker cells, while within the PCG model this frequency range reduces with increasing capacitor thickness. Within both models, a crucial parameter that determines the behaviour of the capacitors filled with an NF material is parasitic resistance, primarily due to the electrode resistance. We present measurements of electrode resistance and find that in ITO cells it is of the order of few hundred ohms. |
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| Keywords: | ferroelectric nematics, dielectric measurements, high-permittivity model, electrode resistance |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 23.11.2024 |
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| Article acceptance date: | 09.03.2025 |
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| Publication date: | 31.03.2025 |
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| Publisher: | Taylor & Francis Group |
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| Year of publishing: | 2025 |
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| Number of pages: | 13 str. |
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| PID: | 20.500.12556/DKUM-94372  |
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| UDC: | 621.317 |
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| ISSN on article: | 1366-5855 |
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| COBISS.SI-ID: | 231098115 |
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| DOI: | 10.1080/02678292.2025.2484234 |
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| Copyright: | © 2025 The Author(s)
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| Publication date in DKUM: | 14.08.2025 |
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| Views: | 199 |
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| Downloads: | 9 |
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| Metadata: |    |
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| Categories: | Misc.
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