Mn4.8Cu0.2Ge3在循环磁场中的磁热稳定性

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-08-18 DOI:10.1016/j.jmmm.2025.173449

Mani Barathi A , Athul S R , Fredrick Jean Paul J , Anvar Kadirbardeev , Swathi Sakthivel , Adler Gamzatov , Nagalakshmi Ramamoorthi

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引用次数: 0

摘要

采用电弧熔炼法制备了一种具有六方晶体结构、空间基团为P63/mcm的Mn4.8Cu0.2Ge3多晶合金。在Tc= 276.5 K时，合金经历了从铁磁相到顺磁相的二阶转变。该样品的磁热效应（MCE）是通过在循环外加磁场中直接测量来研究的，这与商用冰箱的情况完全相似。样品表现出更好的磁热特性，并且在长期暴露15分钟（对应于施加ΔB = 0-1.8 t的循环磁场190次）的情况下性能稳定。材料的MCE具有不可解释的频率依赖性，其中绝热温度变化值在1 Hz - 10 Hz的频率范围内下降16%。在施加磁场ΔB = 0-1.8 T时，通过热容测量间接测量到的磁热效应显示出2.8 J/kg的磁熵变化和1.7 K的绝热温度变化，这与直接测量的研究结果相当。

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Magnetocaloric stability of Mn4.8Cu0.2Ge3 in cyclic magnetic fields

A polycrystalline Mn_4.8Cu_0.2Ge₃ alloy with a hexagonal crystal structure and space group P6₃/mcm was synthesized using arc melting. The alloy undergoes a second-order transition from a ferromagnetic to a paramagnetic phase at T_c= 276.5 K. This sample is studied for its magnetocaloric effect (MCE) by direct measurements in a cyclic applied magnetic field, which is exactly a similar scenario of commercial refrigerators. The sample shows better magnetocaloric characteristics, and the properties are stable for long-term exposure of 15 min, corresponding to 190 cycles of an applied cyclic magnetic field of ΔB = 0–1.8 T. The MCE of the material has an unaccounted frequency dependence in which the value of adiabatic temperature change shows a 16 % drop over a frequency range of 1 Hz − 10 Hz. The magnetocaloric effect, also measured indirectly from heat capacity measurements for an applied magnetic field of ΔB = 0–1.8 T, shows a magnetic entropy change of 2.8 J/kg and adiabatic temperature change of 1.7 K, which are comparable with the direct measurement studies.

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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.