Magnetic Materials of La2/3-xEuxCa1/3MnO3 Manganites for the Refrigeration Application from 150 to 225 K

IF 1.6 4区物理与天体物理 Q3 PHYSICS, APPLIED

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-03-01 DOI:10.1007/s10948-023-06517-4

Binlong Pan, Huafu Chen, Xiang Li, Nengjun Yu, Minxiang Pan, Yundan Yu, Jieyang Fang, Qiong Wu, Hangfu Yang, Hongliang Ge

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Abstract

The phase structure and magnetic and magnetocaloric effect (MCE) properties have been studied in La_2/3-xEu_xCa_1/3MnO₃ (0 ≤ x ≤ 0.08) manganites prepared by conventional solid-state reaction. There is no miscellaneous phase in the samples, which are analyzed by the Rietveld refinement method. The refinement data shows the lattice decreases gradually with smaller radius of Eu³⁺ substitution. The Curie temperature of the material is continuity distributed from 150 to 225 K. Large magnetic entropy changes (ΔS_M) are obtained with Eu³⁺ substitution, the highest value of −ΔS_M is 4.93 J·kg⁻¹ K⁻¹ in the magnetic field change at 2 T, and the relative cooling power (RCP) value is around ~ 110 J·kg⁻¹. The samples undergo a first-order magnetic phase transition with small hysteresis, for x = 0.00, 0.02, when x ≥ 0.4, the samples under a second-order magnetic phase transition. The results show that the substitution of Eu³⁺ can be used to modify the Curie temperature and obtain a continuous operating temperature interval, without sacrificing the MCE. The large MCE performance, continuous working temperature interval, and high cooling efficiency make our samples be used for the application of magnetic refrigeration.

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150 ~ 225k制冷用La2/3-xEuxCa1/3MnO3锰铁磁性材料

摘要研究了传统固相法制备的La2/3-xEuxCa1/3MnO3(0≤x≤0.08)锰矿石的相结构、磁性和磁热效应(MCE)性能。样品中无杂相，采用Rietveld精化法进行分析。精化数据表明，随着Eu3+取代半径的减小，晶格逐渐减小。材料的居里温度在150 ~ 225k范围内连续分布。Eu3+取代得到了较大的磁熵变化(ΔSM)，在2 T磁场变化中，- ΔSM的最大值为4.93 J·kg−1 K−1，相对冷却功率(RCP)值约为~ 110 J·kg−1。样品发生一阶磁相变，磁滞较小，当x = 0.00, 0.02时，当x≥0.4时，样品发生二阶磁相变。结果表明，Eu3+的取代可以在不牺牲MCE的情况下，改变居里温度并获得连续的工作温度区间。MCE性能大，工作温度区间连续，冷却效率高，可用于磁制冷应用。

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来源期刊

Journal of Superconductivity and Novel Magnetism 物理-物理：凝聚态物理

CiteScore

3.70

自引率

11.10%

发文量

342

审稿时长

3.5 months

期刊介绍： The Journal of Superconductivity and Novel Magnetism serves as the international forum for the most current research and ideas in these fields. This highly acclaimed journal publishes peer-reviewed original papers, conference proceedings and invited review articles that examine all aspects of the science and technology of superconductivity, including new materials, new mechanisms, basic and technological properties, new phenomena, and small- and large-scale applications. Novel magnetism, which is expanding rapidly, is also featured in the journal. The journal focuses on such areas as spintronics, magnetic semiconductors, properties of magnetic multilayers, magnetoresistive materials and structures, magnetic oxides, etc. Novel superconducting and magnetic materials are complex compounds, and the journal publishes articles related to all aspects their study, such as sample preparation, spectroscopy and transport properties as well as various applications.