Thermodynamic model to study the structural and electro-optical properties of chiral antiferroelectric smectic C phase exhibited by mesogenic homologous series 3FnHBM6(s) and W-316 mixture

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2023-10-06 DOI:10.1080/01411594.2023.2262701

Abhilasha Singh, Ayushi Rastogi, Shri Singh

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引用次数: 0

Abstract

ABSTRACTUsing a thermodynamic model developed by us to study the structural and electro-optical properties of SmCA∗ phase, we investigate the temperature dependence of helical pitch, tilt angle and spontaneous polarization of a homologous series of fluorinated biphenyl benzoate esters (3FnHBM6, n = 2, 5, 7) and one of the series W-316-3 obtained from the mixture of two chiral liquid crystalline compounds 6F2OBi and 3F6HBM6. The free-energy density of the system exhibiting SmCA∗ phase is written as an expansion series in terms of all the relevant degrees of freedom: Qij, ψ, P, q and the resulting coupling terms between these order parameters. The values of Landau coefficients are determined from the experimental data of antiferroelectric mesogens 3FnHBM6 (n = 2, 5, 7) and W-316-3 in the SmCA∗ phase. Using these coefficients, the electro-optical and structural properties have been studied. We have found good agreements between the theoretical and experimental results.KEYWORDS: Free energy density expansionantiferroelectric liquid crystalspontaneous polarizationsorder parametersstructural propertieselectro-optical properties AcknowledgementI would like to acknowledge JSSMVP Mysore for their kind support and encouragement.Disclosure statementNo potential conflict of interest was reported by the author(s).

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用热力学模型研究了3FnHBM6(s)和W-316混合物的手性反铁电近晶C相的结构和电光性质

摘要:利用我们建立的热力学模型研究SmCA *相的结构和电光性质，研究了同源系列氟化联苯酯(3FnHBM6, n = 2,5,7)和系列W-316-3 (6F2OBi和3F6HBM6)的螺旋节距、倾斜角和自发极化对温度的依赖关系。显示SmCA *相的系统的自由能密度被写成所有相关自由度的展开级数:Qij， ψ， P, q和这些序参数之间的耦合项。利用反铁电介元3FnHBM6 (n = 2,5,7)和W-316-3在SmCA∗相中的实验数据确定了朗道系数的值。利用这些系数，研究了材料的电光性能和结构性能。我们发现理论和实验结果吻合得很好。关键词:自由能密度，膨胀反铁电液晶，自发极化，有序参数，结构性质，电光性质感谢JSSMVP Mysore的支持和鼓励。披露声明作者未报告潜在的利益冲突。

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.