A new order parameter model for the improper ferroelastic phase transitions in KMnF₃ single crystal.

IF 1.9 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Acta Crystallographica Section A: Foundations and Advances Pub Date : 2024-07-01 Epub Date: 2024-06-27 DOI:10.1107/S2053273324004352

Il Hun Kim, Il Hwan Kim, Kum Ok Jang, Song Won Kim

引用次数: 0

Abstract

This paper proposes a new order parameter model which satisfactorily explains complicated symmetry changes, the temperature-pressure (T-P) phase diagram and elastic anomalies observed experimentally with the improper ferroelastic phase transitions in multiferroic KMnF₃ single crystal. First, it is shown that the order parameter model is transformed according to the four-dimensional reducible representation of the wavevector star channel group. Second, based on the order parameter model and the singularity theory, the sixth-order structurally stable Landau potential model is constructed. Finally, the theoretical T-P phase diagram is plotted and the elastic anomalies possible for each of the phase transitions are discussed.

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KMnF3 单晶不恰当铁弹性相变的新阶参数模型。

本文提出了一种新的阶次参数模型，该模型能令人满意地解释多铁性 KMnF3 单晶中复杂的对称性变化、温度-压力（T-P）相图和实验观察到的弹性异常与不恰当的铁弹性相变。首先，研究表明阶次参数模型是根据波矢星形通道组的四维可还原表示进行转换的。其次，基于阶次参数模型和奇异性理论，构建了六阶结构稳定的朗道势模型。最后，绘制了理论 T-P 相图，并讨论了每个相变可能出现的弹性异常。

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

Acta Crystallographica Section A: Foundations and Advances CHEMISTRY, MULTIDISCIPLINARYCRYSTALLOGRAPH-CRYSTALLOGRAPHY

CiteScore

2.60

自引率

11.10%

发文量

419

期刊介绍： Acta Crystallographica Section A: Foundations and Advances publishes articles reporting advances in the theory and practice of all areas of crystallography in the broadest sense. As well as traditional crystallography, this includes nanocrystals, metacrystals, amorphous materials, quasicrystals, synchrotron and XFEL studies, coherent scattering, diffraction imaging, time-resolved studies and the structure of strain and defects in materials. The journal has two parts, a rapid-publication Advances section and the traditional Foundations section. Articles for the Advances section are of particularly high value and impact. They receive expedited treatment and may be highlighted by an accompanying scientific commentary article and a press release. Further details are given in the November 2013 Editorial. The central themes of the journal are, on the one hand, experimental and theoretical studies of the properties and arrangements of atoms, ions and molecules in condensed matter, periodic, quasiperiodic or amorphous, ideal or real, and, on the other, the theoretical and experimental aspects of the various methods to determine these properties and arrangements.

A new order parameter model for the improper ferroelastic phase transitions in KMnF3 single crystal.

Abstract

A new order parameter model for the improper ferroelastic phase transitions in KMnF₃ single crystal.