Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6) ribbons  

作　　者：Qian Liu Min Tong Xin-Guo Zhao Nai-Kun Sun Xiao-Fei Xiao Jie Guo Wei Liu Zhi-Dong Zhang 刘倩;佟敏;赵新国;孙乃坤;肖小飞;郭杰;刘伟;张志东(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;School of Science,Shenyang Ligong University,Shenyang 110159,China)

机构地区：[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

出　　处：《Chinese Physics B》2021年第8期502-508,共7页中国物理B（英文版）

基　　金：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);the Liaoning Revitalization Talents Program,China(Grant No.XLYC1807122).

摘　　要：The effects of wheel speeds and high-pressure hydrogen treatment on phase evolution,microstructure,and magnetocaloric properties in La_(0.5)Pr_(0.5)Fe_(11.4)Si_(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 NaZn_(13)-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_(0.5)Pr_(0.5)Fe_(11.4)Si_(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_(0.5)Pr_(0.5)Fe_(11.4)Si_(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 

分 类 号：O469[理学—凝聚态物理]