Abstract
RENiX2 compounds, where RE = rare-earth element and X = p-block element, have been highly regarded for cryogenic magnetocaloric applications. Depending on the elements, they can crystallize in CeNiSi2-type, NdNiGa2-type, or MgCuAl2-type crystal structures, showing different types of magnetic ordering and thus affect their magnetic properties. Regarding the magnetocaloric effect, MgCuAl2-type aluminides show larger values than those of the CeNiSi2-type silicides and the NdNiGa2-type gallides due to the favored ferromagnetic ground state. However, RENiGa2 gallides can crystallize in either NdNiGa2- or MgCuAl2-type structures depending on the RE element. In this work, we select heavy RE (HRE) elements for exploring the microstructure, magnetic ordering and magnetocaloric performance of HRENiGa2 (HRE = Dy, Ho or Er) gallides. They all crystallize in the desired MgCuAl2-type crystal structure which undergoes a second-order transition from ferro- to para-magnetic state with increasing temperature. The maximum isothermal entropy change (∣∆Sisomax∣) values are 6.2, 10.4, and 11.4 J kg−1 K−1 (0–5 T) for DyNiGa2, HoNiGa2, and ErNiGa2, respectively, which are comparable to many recently reported cryogenic magnetocaloric materials. Particularly, the excellent magnetocaloric properties of HoNiGa2 and ErNiGa2 compounds, including their composite, fall in the temperature range that enables them for the in-demand hydrogen liquefaction systems.
摘要
RENiX2化合物(其中RE为稀土元素, X为p区元素)在低温磁制冷 应用中受到高度关注. 它们根据元素的不同可以结晶成CeNiSi2型、 NdNiGa2型或MgCuAl2型晶体结构, 并表现出不同类型的磁有序性从 而影响其磁性. MgCuAl2型铝化物由于具有有利的铁磁基态从而表现 出比CeNiSi2型硅化物和NdNiGa2型镓化物更大的磁热性能. 此外, RENiGa2 镓化物根据RE元素的不同可以结晶成NdNiGa2或MgCuAl2型结 构. 本文中, 我们选择重稀土(HRE)元素来探索HRENiGa2 (HRE = Dy, Ho或Er)镓化物的微观结构、磁有序和磁热性能. 三种化合物均以 MgCuAl2型晶体结构结晶, 并且随着温度的升高经历了从铁磁到顺磁 的二级磁相转变. DyNiGa2, HoNiGa2和ErNiGa2化合物的最大等温磁 熵变(∣ΔSisomax∣)值分别为6.2, 10.4和11.4 J kg−1 K−1 (0–5 T), 这与许多最 近报道的低温磁制冷材料性能相当. 特别地, HoNiGa2和ErNiGa2化合 物(包括它们的复合材料)在氢气液化的温度范围内表现出优异的磁热 性能.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (52071197), the Science and Technology Commission of Shanghai Municipality (19ZR1418300 and 19DZ2270200), the Independent Research and Development Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University (SKLASS 2021-Z05), Grant PID2019-105720RB-I00 funded by MCIN/AEI/10.13039/501100011033, US/JUNTA/FEDER-UE (US-1260179), and Consejería de Economía, Conocimiento, Empresas y Universidad de la Junta de Andalucía (P18-RT-746). Guo D would like to acknowledge the support provided by China Scholarship Council (CSC) of the Ministry of Education, China (202006890050). Moreno-Ramírez LM acknowledges a postdoctoral fellowship from Junta de Andalucía and European Social Fund (ESF).
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Zhang Y and Law JY designed the idea of the research. Guo D and Zhang Y performed the experiments. Guo D, Moreno-Ramírez LM, and Law JY performed the data analysis and prepared the manuscript. All the authors contributed to the general discussion and review and editing. Franco V and Zhang Y contributed to the conceptualization and supervision.
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Dan Guo is a PhD student at the School of Materials Science and Engineering, Shanghai University (SHU), China. She is now a visiting scholar at the University of Seville, Spain, sponsored by the China Scholarship Council. Her research interests focus on magnetic properties and magnetocaloric effect of heavy rare-earth based compounds.
Jia-Yan Law obtained her PhD degree from the School of Materials Science and Engineering, Nanyang Technological University, Singapore. Currently, she is a postdoctoral researcher at the University of Seville (Spain), leading the research line “Functional High-Entropy Alloys”. Her research interests include the development of magnetic and magnetocaloric materials, device and novel evaluation techniques as well as additive manufacturing.
Yikun Zhang received her PhD degree from Northeastern University (China); afterward, she was granted by the Alexander von Humboldt (AvH) scholarship for postdoctoral research. Currently, she is a professor at Hangzhou Dianzi University (China). Her research mainly focuses on designing and exploring magnetic functional materials, especially rare-earth-based magnetic refrigeration materials.
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Guo, D., Moreno-Ramírez, L.M., Law, JY. et al. Excellent cryogenic magnetocaloric properties in heavy rare-earth based HRENiGa2 (HRE = Dy, Ho, or Er) compounds. Sci. China Mater. 66, 249–256 (2023). https://doi.org/10.1007/s40843-022-2095-6
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DOI: https://doi.org/10.1007/s40843-022-2095-6