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<p>Exploiting the magnetocaloric effect for low-temperature magnetic refrigeration presents a compelling green technology for cryogenic applications in space science and hydrogen liquefaction. In this work, we investigate the structural and magnetic properties of RE(Fe<sub>0.25</sub>Co<sub>0.75</sub>)<sub>2</sub>H<sub>3</sub> compounds, where RE represents Ho and Er. These compounds crystallize in the cubic MgCu<sub>2</sub> (C15) structure with a lattice parameter of 7.62 Å for RE = Ho and 7.60 Å for RE = Er. Magnetization measurements as a function of temperature, performed in a 0.05 T magnetic field, reveal that both hydrides exhibit ferrimagnetic behaviour. The Curie temperatures (T<sub>C</sub>) for Ho and Er hydrides were determined to be 124&#xa0;K and 75&#xa0;K, respectively. We studied the magnetic entropy change (−∆S<sub>M</sub>) and refrigerant capacity (RC) of both samples by measuring isothermal magnetizations under various field changes between 0 and 7 Tesla. With increasing applied field, both −∆S<sub>M</sub> and RC increase, and the temperature span of the −∆S<sub>M</sub> versus T plots widens. Furthermore, from the −∆S<sub>M</sub> (T) curves under an external magnetic field change of 5 T, we observed a maximum -ΔS<sub>M</sub> of ∼ 3.11 and 4.41 Jkg<sup>-1</sup>K<sup>-1</sup> for RE = Ho and Er, respectively. The corresponding temperature-averaged entropy change over a 10&#xa0;K temperature span was TEC<sub>10K</sub> ∼2.9 and ∼3.8 Jkg<sup>-1</sup>K<sup>-1</sup> for RE = Ho and Er, respectively. These results indicate that Er(Fe<sub>0.25</sub>Co<sub>0.75</sub>)<sub>2</sub>H<sub>3</sub> exhibits superior thermomagnetic properties compared to Ho(Fe<sub>0.25</sub>Co<sub>0.75</sub>)<sub>2</sub>H<sub>3</sub> particularly for low-temperature magnetic cooling applications.</p>

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Cryogenic magnetic properties and magnetocaloric performance in the RE(Fe0.25Co0.75)2H3 (RE = Ho and Er) laves phase compounds

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • I. Chaaba,
  • R. M’nassri

摘要

Exploiting the magnetocaloric effect for low-temperature magnetic refrigeration presents a compelling green technology for cryogenic applications in space science and hydrogen liquefaction. In this work, we investigate the structural and magnetic properties of RE(Fe0.25Co0.75)2H3 compounds, where RE represents Ho and Er. These compounds crystallize in the cubic MgCu2 (C15) structure with a lattice parameter of 7.62 Å for RE = Ho and 7.60 Å for RE = Er. Magnetization measurements as a function of temperature, performed in a 0.05 T magnetic field, reveal that both hydrides exhibit ferrimagnetic behaviour. The Curie temperatures (TC) for Ho and Er hydrides were determined to be 124 K and 75 K, respectively. We studied the magnetic entropy change (−∆SM) and refrigerant capacity (RC) of both samples by measuring isothermal magnetizations under various field changes between 0 and 7 Tesla. With increasing applied field, both −∆SM and RC increase, and the temperature span of the −∆SM versus T plots widens. Furthermore, from the −∆SM (T) curves under an external magnetic field change of 5 T, we observed a maximum -ΔSM of ∼ 3.11 and 4.41 Jkg-1K-1 for RE = Ho and Er, respectively. The corresponding temperature-averaged entropy change over a 10 K temperature span was TEC10K ∼2.9 and ∼3.8 Jkg-1K-1 for RE = Ho and Er, respectively. These results indicate that Er(Fe0.25Co0.75)2H3 exhibits superior thermomagnetic properties compared to Ho(Fe0.25Co0.75)2H3 particularly for low-temperature magnetic cooling applications.