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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Experimental and theoretical analysis of magnetocaloric behavior of Dy_(1-x)Er_xNi_2 intermetallics (x = 0.25, 0.5, 0.75) and their composites for low-temperature refrigerators performing an Ericsson cycle
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Experimental and theoretical analysis of magnetocaloric behavior of Dy_(1-x)Er_xNi_2 intermetallics (x = 0.25, 0.5, 0.75) and their composites for low-temperature refrigerators performing an Ericsson cycle

机译：DY_（1-X）ER_XNI_2金属间机构的实验和理论分析（x = 0.25,0.5,0.75）及其用于执行爱立信周期的低温冰箱的复合材料

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摘要

In the present work, the structural, magnetic, and thermodynamic properties of Dy_(1-x)Er_xNi_2 (x = 0.25, 0.5, 0.75) Laves-phase intermetallics. being continuous solid solutions in the DyNi_2-ErNi_2 system, synthesized by arc melting, are experimentally studied and analyzed in accordance with mutual substitution within the rare-earth sublattice. The existence of Laves-phase superstructure (space group F43m) in the substituted Dy_(1-x)Er_xNi_2 compounds was found by x-ray diffraction analysis. Low-temperature magnetic studies showed the ferromagnetic behavior of the compounds: their Curie temperatures correlate with the erbium content; namely, they decrease from 16.8 K for Dy_(0.75)Er_(0.25)Ni_2 to 10.0 K for Dy_(0.75)Er_(0.25)Ni_2. Heat capacity measurements performed in magnetic fields of 1 and 2 T allowed us to estimate the isothermal magnetic entropy and adiabatic temperature changes for Dy_(1-x)Er_xNi_2. Independently, a theoretical analysis was performed for a polycrystalline sample in the frame of a model Hamiltonian taking into account the Zeeman exchange interaction and crystal electric field anisotropy and was expanded to experimental results. Composites with optimum proportions of the individual Dy_(0.75)Er_(0.25)Ni_2, Dy_(0.5)Er_(0.5)Ni_2, and Dy_(0.25)Er_(0.75)Ni_2 components were theoretically determined. The results indicate that the proposed composites are good candidates to be used as the refrigerant material in a magnetic refrigerator performing an Ericsson cycle at low temperatures. The relative cooling power RCP. refrigerant capacity RC, temperature averaged entropy change TEC, and the changes of emitted or absorbed quantity of heat △Q were calculated for investigated samples. Direct measurements of the adiabatic temperature change in the vicinity of the magnetic transition temperature were carried out in magnetic fields up to 14 T. The regularities found are discussed in terms of Landau's theory of second-order magnetic phase transitions.
机译：在本作的工作中，DY_（1-X）ER_XNI_2（x = 0.25,0.5,0.75）熔炉相金属的结构，磁性和热力学性能。在Dyni_2-Erni_2系统中是连续的固体溶液，通过电弧熔化合成，通过稀土化学内的互换进行实验研究和分析。通过X射线衍射分析发现取代的DY_（1-X）ER_XNI_2化合物中的Laves相超级结构（空间组F43m）的存在。低温磁性研究显示了化合物的铁磁性行为：它们的居里温度与铒含量相关;即，对于Dy_（0.75）ER_（0.25）NI_2，它们从16.8 k减小到DY_（0.75）ER_（0.25）ER_（0.25）NI_2至10.0K。在1和2 T的磁场中进行的热容量测量允许我们估计DY_（1-x）ER_XNI_2的等温磁熵和绝热温度变化。独立地，考虑到塞曼交换相互作用和晶体电场各向异性，对模型Hamiltonian的框架中的多晶样品进行了理论分析，并扩展到实验结果。具有最佳比例的单独DY _（0.75）ER_（0.25）NI_2，DY_（0.5）ER_（0.5）NI_2和DY_（0.25）ER_（0.75）NI_2分量的复合材料在理论上确定。结果表明，所提出的复合材料是用作在低温下执行爱立信循环的磁冰箱中的制冷剂材料的良好候选。相对冷却功率RCP。制冷剂容量RC，温度平均熵改变TEC，并计算用于研究样品的发射或吸收量的热量的变化。磁性转变温度附近的绝热温度变化的直接测量在磁场中进行，最高可达14吨。在Landau的二阶磁相转变理论方面讨论了所发现的规律性。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2021年第21期|214429.1-214429.14|共14页
  • 作者

    Jacek Cwik; Yurii Koshkidko; Konstantin Nenkov; Alexandra Mikhailova; Malgorzata Malecka; Tetiana Romanova; Natalia Kolchugina; Nilson Antunes de Oliveira;

  • 作者单位

    Institute of Low Temperature and Structure Research PAS Okolna 2 50-422 Wroclaw Poland;

    Institute of Low Temperature and Structure Research PAS Okolna 2 50-422 Wroclaw Poland;

    IFW Dresden Institute of Metallic Materials D-01171 Dresden Germany;

    Baikov Institute of Metallurgy and Materials Science RAS 119991 Moscow Russia;

    Institute of Low Temperature and Structure Research PAS Okolna 2 50-422 Wroclaw Poland;

    Institute of Low Temperature and Structure Research PAS Okolna 2 50-422 Wroclaw Poland;

    Baikov Institute of Metallurgy and Materials Science RAS 119991 Moscow Russia;

    Instituto de Fisica Armando Dias Tavares-Universidade do Estado do Rio de Janeiro Rua Sao Francisco Xavier 524 20550-013 Rio de Janeiro RJ Brazil;

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