Theoretical modelling of magnetic and magnetocaloric properties in rare-earth high-entropy compounds: Insights from Gd0.2Tb0.2Dy0.2Ho0.2Er0.2Al2

被引：0

作者：

de Oliveira, R. S. ^{[1
]}

Carvalho, A. M. G. ^{[2
,3
,4
]}

de Sousa, V. S. R. ^{[2
]}

Nobrega, E. P. ^{[2
]}

dos Santos Jr, S. S. ^{[2
]}

von Ranke, P. J. ^{[2
]}

Ribeiro, P. O. ^{[2
]}

Alho, B. P. ^{[2
]}

机构：

[1] Univ Estado Rio de Janeiro UERJ, Inst Matemat & Estat, BR-20550013 Rio De Janeiro, RJ, Brazil

[2] Univ Estado Rio de Janeiro UERJ, Inst Fis Armando Dias Tavares, BR-20550013 Rio De Janeiro, RJ, Brazil

[3] Univ Fed Sao Paulo, Dept Engn Quim, BR-09913030 Diadema, SP, Brazil

[4] Univ Estadual Maringa, Dept Engn Mecan, BR-87020900 Maringa, PR, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2025年 / 1036卷

关键词：

Magnetocaloric effect; High-entropy compounds; High-entropy alloys; Mean field magnetic model; Magnetic refrigeration;

D O I：

10.1016/j.jallcom.2025.181775

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, we investigate the magnetic and magnetocaloric properties of the high-entropy compound (HECs) Gd0.2Tb0.2Dy0.2Ho0.2Er0.2Al2, focusing on the complex interactions between rare-earth sublattices. Our multisublattice Hamiltonian model considers crystalline electric field interactions, Zeeman effect for the five rareearth sublattices and the exchange interaction among combinations of rare-earth ions. Intra-and intersublattice exchange interactions were adjusted based on parent RAl2 compounds and pseudo-binary R1-xR'xAl2 (with R and R' corresponding to rare-earth elements) materials to match the Curie temperature and magneto-caloric behavior. Our theoretical model shows good agreement with experimental data. The easy magnetization direction was determined to be along the (111) axis. We also compared the magnetocaloric performance of the HECs with simulated composites. This study suggests that HECs based on RAl2 compounds have potential for optimizing magnetocaloric behavior, particularly in low-temperature cooling applications.

引用

页数：5

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