An ab initio study to investigate the physical properties of CsEuX3 (X=Cl, Br, and I) using different Exchange-Correlation potentials

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Results in Physics Pub Date : 2024-09-19 DOI:10.1016/j.rinp.2024.107980
Anas Y. Al-Reyahi , Said M. Al Azar , Saber Saad Essaoud , Mohammed Elamin Ketfi , Mufeed Maghrabi
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Abstract

Several exchange–correlation potentials within the framework of Density Functional Theory (DFT) were used to study the structural, electronic, magnetic, optical, and thermoelectric properties of cubic perovskites CsEuX3 (X=Cl, Br, and I). The exchange–correlation potentials used in this study include GGA, mBJ, and GGA+U, both with and without spin–orbit coupling (SOC). The stability of all compounds was confirmed by the obtained values of the cohesive energy, formation energy, and tolerance factor. When GGA+U with SOC is used, all compounds show direct bandgap with no effect of the spin state on the bandgap value. The bandgap varies differently for spin-up and spin-down states under pressure. Europium ions control the magnetic properties. Optical investigations indicate that CsEuBr3 and CsEuI3 exhibit identical characteristics, whereas CsEuCl3 has a similar trend but shifted to higher energy. Absorption mostly takes place in the UV region, whereas there is about 20 % reflectance in the infrared (IR) and visible regions. All compounds have low energy loss and excellent transparency. Our investigation indicates that the present compounds are good thermoelectric materials with a high figure of merit. For example, CsEuCl3 demonstrates a figure of merit (ZT) ranging from 0.82 to 0.86 for spin-up and around 1 for spin-down over the temperature range 50–800 K. Such encouraging results indicate that all compounds are potential candidates for optical applications and thermoelectric devices.

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使用不同交换相关电势研究 CsEuX3(X=Cl、Br 和 I)物理性质的 ab initio 研究
在密度泛函理论(DFT)框架内使用了几种交换相关势来研究立方包晶 CsEuX3(X=Cl、Br 和 I)的结构、电子、磁性、光学和热电特性。研究中使用的交换相关电势包括 GGA、mBJ 和 GGA+U,包括自旋轨道耦合(SOC)和非自旋轨道耦合(SOC)。所有化合物的内聚能、形成能和容限因子值都证实了它们的稳定性。当使用带有 SOC 的 GGA+U 时,所有化合物都显示出直接带隙,自旋态对带隙值没有影响。在压力下,自旋上升态和自旋下降态的带隙变化不同。铕离子控制着磁性能。光学研究表明,CsEuBr3 和 CsEuI3 具有相同的特性,而 CsEuCl3 具有类似的趋势,但能量更高。吸收主要发生在紫外线区域,而在红外线(IR)和可见光区域有大约 20% 的反射率。所有化合物的能量损耗都很低,透明度极佳。我们的研究表明,目前的化合物是具有高优点的良好热电材料。例如,在 50-800 K 的温度范围内,CsEuCl3 的自旋上升功勋值(ZT)为 0.82 至 0.86,自旋下降功勋值(ZT)约为 1。
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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