Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La0.5Pr0.5Fe11.4Si1.6 ribbons

doi:10.1088/1674-1056/abea91

中国物理B ›› 2021, Vol. 30 ›› Issue (8): 87502-087502.doi: 10.1088/1674-1056/abea91

Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La_0.5Pr_0.5Fe_11.4Si_1.6 ribbons

Qian Liu(刘倩)^1,2, Min Tong(佟敏)¹, Xin-Guo Zhao(赵新国)^1,2,†, Nai-Kun Sun(孙乃坤)^3,‡, Xiao-Fei Xiao(肖小飞)^1,2, Jie Guo(郭杰)^1,2, Wei Liu(刘伟)^1,2, and Zhi-Dong Zhang(张志东)^1,2

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
3 School of Science, Shenyang Ligong University, Shenyang 110159, China

收稿日期:2020-12-24 修回日期:2021-01-25 接受日期:2021-03-01 出版日期:2021-07-16 发布日期:2021-07-23
通讯作者: Xin-Guo Zhao, Nai-Kun Sun E-mail:xgzhao@imr.ac.cn;naikunsun@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51771197), the Fund from the Chinese Academy of Sciences (Grant No. KJZD-EW-M05), and the Liaoning Revitalization Talents Program, China (Grant No. XLYC1807122).

Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La_0.5Pr_0.5Fe_11.4Si_1.6 ribbons

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
3 School of Science, Shenyang Ligong University, Shenyang 110159, China

Received:2020-12-24 Revised:2021-01-25 Accepted:2021-03-01 Online:2021-07-16 Published:2021-07-23
Contact: Xin-Guo Zhao, Nai-Kun Sun E-mail:xgzhao@imr.ac.cn;naikunsun@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51771197), the Fund from the Chinese Academy of Sciences (Grant No. KJZD-EW-M05), and the Liaoning Revitalization Talents Program, China (Grant No. XLYC1807122).

摘要/Abstract

摘要： The effects of wheel speeds and high-pressure hydrogen treatment on phase evolution, microstructure, and magnetocaloric properties in La_0.5Pr_0.5Fe_11.4Si_1.6 melt-spun ribbons are studied in this work. The results reveal that the increase of wheel speed is beneficial to the formation of cubic NaZn₁₃-type phase and the grain refinement. The optimized wheel speed for microstructural and magnetocaloric properties is 30 m/s. The largest entropy change of 18.1 J/kg·K at 190 K under a magnetic field change of 0 T-5 T is obtained in La_0.5Pr_0.5Fe_11.4Si_1.6 ribbons melt-spun at 30 m/s. After a high-pressure hydrogen treatment of 50 MPa, the Curie temperature of the ribbons prepared at 30 m/s is adjusted to about 314 K and the large -ΔS_M of 17.9 J/kg·K under a magnetic field change of 0 T-5 T is achieved at room temperature with almost none hysteresis loss. The small thermal and magnetic hysteresis and the large -ΔS_M make the La_0.5Pr_0.5Fe_11.4Si_1.6 hydride ribbons appropriate for magnetic refrigerant applications around room temperature.

关键词: La-Pr-Fe-Si, melt-spun ribbon, hydrides, magnetic properties, microstructure

Abstract: The effects of wheel speeds and high-pressure hydrogen treatment on phase evolution, microstructure, and magnetocaloric properties in La_0.5Pr_0.5Fe_11.4Si_1.6 melt-spun ribbons are studied in this work. The results reveal that the increase of wheel speed is beneficial to the formation of cubic NaZn₁₃-type phase and the grain refinement. The optimized wheel speed for microstructural and magnetocaloric properties is 30 m/s. The largest entropy change of 18.1 J/kg·K at 190 K under a magnetic field change of 0 T-5 T is obtained in La_0.5Pr_0.5Fe_11.4Si_1.6 ribbons melt-spun at 30 m/s. After a high-pressure hydrogen treatment of 50 MPa, the Curie temperature of the ribbons prepared at 30 m/s is adjusted to about 314 K and the large -ΔS_M of 17.9 J/kg·K under a magnetic field change of 0 T-5 T is achieved at room temperature with almost none hysteresis loss. The small thermal and magnetic hysteresis and the large -ΔS_M make the La_0.5Pr_0.5Fe_11.4Si_1.6 hydride ribbons appropriate for magnetic refrigerant applications around room temperature.

Key words: La-Pr-Fe-Si, melt-spun ribbon, hydrides, magnetic properties, microstructure

中图分类号: (Magnetocaloric effect, magnetic cooling)

75.30.Sg

Qian Liu(刘倩), Min Tong(佟敏), Xin-Guo Zhao(赵新国), Nai-Kun Sun(孙乃坤), Xiao-Fei Xiao(肖小飞), Jie Guo(郭杰), Wei Liu(刘伟), and Zhi-Dong Zhang(张志东). Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La_0.5Pr_0.5Fe_11.4Si_1.6 ribbons[J]. 中国物理B, 2021, 30(8): 87502-087502.

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Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La_0.5Pr_0.5Fe_11.4Si_1.6 ribbons

Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La_0.5Pr_0.5Fe_11.4Si_1.6 ribbons

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