Tricritical behavior of the smectic-hexatic phase transitions in binary mixtures using the landau mean field theory

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2023-04-28 DOI:10.1080/01411594.2023.2203395

H. Yurtseven, E. Kilit Dogan

引用次数: 0

Abstract

ABSTRACT The smectic-hexatic phase transitions are studied by the Landau mean field theory in binary mixtures, particularly, THI-14 + MPR-6 liquid crystalline system. By considering the phase lines of SmA-Hex B, SmC-SmF (Hex F) and SmF-Hex B as the first order; SmA-SmC and SmC-SmF as the second order, in the presence of the two tricritical points (C-F-B and A-C-B), we calculate the T-X phase diagram of the binary mixture studied. The phase line equations obtained from the free energies of the smectic and hexatic phases, are fitted to the experimental data given in the literature. We find that the Landau mean field theory explains satisfactorily the observed T-X phase diagram for the smectic-hexatic transitions in the binary mixture of THI-14 + MPR-6.

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用landau平均场理论研究二元混合物中近晶六方相变的三临界行为

用朗道平均场理论研究了二元混合物，特别是ti -14 + MPR-6液晶体系的近六相相变。通过考虑SmA-Hex B、SmC-SmF (Hex F)和SmF-Hex B的一阶相线;在两个三临界点(C-F-B和A-C-B)存在的情况下，我们计算了所研究二元混合物的T-X相图。由近晶相和六晶相的自由能得到的相线方程与文献中给出的实验数据拟合。我们发现朗道平均场理论很好地解释了ti -14 + MPR-6二元混合物中近六态转变的T-X相图。

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.