Structural, magnetic and magnetocaloric properties of rare-earth based TbGd(MoO4)3 molybdates

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-08-09 DOI:10.1016/j.jmmm.2025.173434

Athira P , Debasmita Bala , Abhijit Nayak , Devajyoti Mukherjee , Jyothinagaram Krishnamurthy

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Abstract

Rare-earth molybdates have drawn tremendous attention due to their magnetoelectric nature, including type-II multiferroicity and structural phase transitions linked to displacive type ferroelectricity, making them well-suited for multicaloric effect in solid-state refrigeration phenomena. This study focuses on the synthesis and crystal structure analysis, temperature and field- dependent magnetic susceptibility, and magnetocaloric properties of TbGd(MoO₄)₃ (TGMO) polycrystals. The magnetic field and temperature variation of magnetization and specific heat capacity were conducted to evaluate the spin contributed magnetic entropy changes (−ΔS_M) and temperature change under adiabatic (ΔT_ad) conditions in the synthesised sample. The investigated compound exhibits no obvious long-range order with in the measured low-temperature limit. The calculated –ΔS_M shows a maximum value of 13.6 Jkg⁻¹K⁻¹ at 3.5 K for 70 kOe. Moreover, the estimated temperature change under adiabatic conditions for TGMO was found to be 8.5 K. These characteristics, including a significant magnetocaloric effect with magnetic field and the absence of thermal and magnetic hysteresis loss, is comparable to good magnetic refrigerants near liquid helium temperatures.

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稀土基TbGd(MoO4)3钼酸盐的结构、磁性和磁热学性质

稀土钼酸盐由于其磁电性质引起了极大的关注，包括ii型多铁性和与位移型铁电性相关的结构相变，使其非常适合于固态制冷现象中的多热效应。本研究重点研究了TbGd(MoO4)3 （TGMO）多晶的合成、晶体结构分析、温度场依赖性磁化率和磁热特性。在绝热（ΔTad）条件下，对合成的样品进行了磁场和温度的变化（磁化强度和比热容），以评估自旋贡献的磁熵变化（−ΔSM）和温度变化。所研究的化合物在测得的低温极限内没有明显的长程序。计算结果-ΔSM显示，在3.5 K、70 kOe条件下，最大值为13.6 Jkg−1K−1。此外，TGMO在绝热条件下的温度变化估计为8.5 K。这些特性，包括与磁场的显著磁热效应和没有热和磁滞损失，可与液氦温度附近的良好磁性制冷剂相媲美。

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 Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.