中国物理B ›› 2021, Vol. 30 ›› Issue (8): 87502-087502.doi: 10.1088/1674-1056/abea91
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
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
摘要: The effects of wheel speeds and high-pressure hydrogen treatment on phase evolution, microstructure, and magnetocaloric properties in La0.5Pr0.5Fe11.4Si1.6 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 La0.5Pr0.5Fe11.4Si1.6 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 -ΔSM 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 -ΔSM make the La0.5Pr0.5Fe11.4Si1.6 hydride ribbons appropriate for magnetic refrigerant applications around room temperature.
中图分类号: (Magnetocaloric effect, magnetic cooling)