Thermodynamic model to study the ferroelectric behaviour of lactic acid derivatives with keto linkage group

IF 1.4 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2022-08-11 DOI:10.1080/01411594.2022.2106227

Abhilasha Singh, S. R, A. Rastogi

引用次数: 0

Abstract

ABSTRACT The electro-optical and structural properties of chiral lactic acid derivatives with keto linkage group ((S)-4-((1-alkoxy-1-oxopropan-2-yloxy) carbonyl)phenyl4’-alkyloylbiphenyl-4-carboxylates denoted as KL n/m) exhibiting Sm C* phase and Sm A*−Sm C* phase transition have been studied by using a thermodynamic model based on Landau-de-Gennes theory. The free-energy density of the system is expanded in terms of three degrees of freedom – tensor orientational order , the scalar smectic order , the polarisation vector P, the wave vector q, and the couplings between these order parameters. The values of the Landau coefficients involved in the free-energy density have been calculated by comparing the experimental data of tilt angle, spontaneous polarisation, and pitch of KL n/m. The theoretical and experimental data have been analysed, and a close agreement has been found between the two.

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用热力学模型研究含酮键基乳酸衍生物的铁电行为

采用基于Landau-de-Gennes理论的热力学模型，研究了具有酮键基团的手性乳酸衍生物((S)-4-((1-烷氧基-1-氧丙基-2-氧氧基)羰基)苯基4′-烷基联苯基-4-羧酸盐(KL n/m)具有Sm C*相和Sm A* - Sm C*相转变的电光和结构性质。系统的自由能密度以三个自由度展开——张量方向阶、标量密序、极化矢量P、波矢量q，以及这些阶参量之间的耦合。通过比较KL n/m的倾斜角、自发极化和螺距的实验数据，计算了与自由能密度有关的朗道系数值。对理论和实验数据进行了分析，发现两者非常吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.