Magnetism and cryogenic magnetocaloric effect of triangular-lattice LnOF (Ln = Gd, Dy, Ho, and Er) compounds

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2025-01-01 DOI:10.1016/j.jre.2023.10.005

Jianjian Gong , Lu Tian , Lei Zhang , Zhaojun Mo , Yuanpeng Wang , Jun Shen

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引用次数: 0

Abstract

Frustrated lanthanide oxides with dense magnetic lattice and suppressed ordering temperature have potential applications in cryogenic magnetic refrigeration. Herein, the crystal structure, magnetic properties, magnetic phase transition (MPT) together with magnetocaloric effect (MCE) of LnOF (Ln = Gd, Dy, Ho, and Er) compounds were investigated. Crystallographic study shows that these compounds crystallize in the centrosymmetric space group

R \bar{3} m

with an ideal triangular lattice. No long-range magnetic ordering is observed above 2 K for LnOF (Ln = Gd, Ho, and Er). However, DyOF compound undergoes an MPT from paramagnetic (PM) to antiferromagnetic (AFM) at the Néel temperature (T_N ≈ 4 K). Considerable reversible MCE is observed in these triangular-lattice compounds. Under the magnetic field change (μ₀ΔH) of 0–2 T, the maximum values of magnetic entropy change

(- Δ S_{M}^{max})

of them are 6.1, 9.4, 12.7, and 14.1 J/(kg·K), respectively. Interestingly, the value of ErOF with Ising-like spin is 2.3 times that of GdOF, which provides an approach for exploring magnetic refrigerants with excellent low-field cryogenic magnetocaloric effect.

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三角形晶格LnOF （Ln = Gd, Dy, Ho, Er）化合物的磁性和低温磁热效应

具有致密磁晶格和抑制有序温度的受挫镧系氧化物在低温磁制冷中具有潜在的应用前景。本文研究了LnOF （Ln = Gd, Dy, Ho, Er）化合物的晶体结构、磁性能、磁相变（MPT）和磁热效应（MCE）。晶体学研究表明，这些化合物在中心对称空间群R3¯m中结晶，具有理想的三角晶格。LnOF （Ln = Gd， Ho和Er）在2 K以上没有观察到远程磁有序。然而，DyOF化合物在n温度（TN≈4 K）下经历了顺磁性（PM）到反铁磁性（AFM）的相变。在这些三角晶格化合物中观察到相当大的可逆相变。在0 ~ 2 T的磁场变化（μ0ΔH）下，它们的磁熵变化（-ΔSMmax）最大值分别为6.1、9.4、12.7和14.1 J/（kg·K）。有趣的是，具有ising类自旋的ErOF值是GdOF的2.3倍，这为探索具有优异低场低温磁热效应的磁性制冷剂提供了途径。

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

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.