Large Magnetocaloric Effect of PrNi Compound at Liquid-Hydrogen Temperatures

作者：Yawei Gao, Xinqi Zheng, Hu Zhang, Dingsong Wang, Baojie Jin, Hao Liu, Shanshan Zhen, Jiahao Gao, Yang Pan, Lei Xi, Jun Liu, Zhenxing Li, Jun Shen, Shouguo Wang, Baogen Shen · 发表于：IEEE Transactions on Magnetics · 年份：2023 · DOI：10.1109/tmag.2023.3282050 · 被引用次数：1 · 研究领域：Magnetic and transport properties of perovskites and related materials、Thermal Expansion and Ionic Conductivity、Rare-earth and actinide compounds

In the work, polycrystalline PrNi compound was synthesized by the arc-melting method. The crystal structure is determined as a CrB-type orthorhombic structure (Space group Pnma). The Curie temperature ($T_{\mathrm {C}}$) is determined to be 21.0 K according to the maximum absolute value of the first derivative of magnetization. The slope of the Arrott plots is positive around phase transition temperature, indicating the second-order phase transition (SOPT) characteristic. The magnetic entropy change ($-\Delta S_{\mathrm {M}}$) was calculated from the isothermal magnetization data based on Maxwell’s relationship. The maximum value of$-\Delta S_{\mathrm {M}}$is calculated to be 7.3 and 13.0 J/kg$\cdot \text{K}$for the magnetic field changes of 0–2 and 0–5 T, respectively. The large magnetocaloric effect (MCE) around 21.0 K with a SOPT feature indicates that PrNi is great potential in the application of magnetic refrigeration for hydrogen liquefaction.