Enhanced Cryogenic Magnetocaloric Effect Induced by Small Size GdNi_5 Nanoparticles  

作　　者：Jun Li Song Ma Han Wang Wenjie Gong Jingjing Jiang Shaojie Li Yong Wang Dianyu Geng Zhidong Zhang 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,and International Centre for Materials Physics,Chinese Academy of Sciences

出　　处：《Journal of Materials Science & Technology》2014年第10期973-978,共6页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.50901078 and 51271178);the National High Technology Research and Development Program (No.2011AA03A402) of China;the National High Technology Research and Development Program of China("863 Program",No.2011AA03A402)

摘　　要：GdNi5 nanoparticles and GdNis/Gd2O3 nanocapsules （with GdNi5 core and Gd2O3 shell） were prepared by arcdischarge technique under different hydrogen partial pressure. The GdNi5 nanoparticles show irregular spherical shape and have a size distribution of 10-50 nm with an average diameter of 15 nm. In comparison, the GdNi5/Gd2O3 nanocapsules present spherical morphology and show a size distribution of 10-100 nm with an average diameter of 60 nm. Under a magnetic field change of 50 kOe, the maximum magnetic entropy change of GdNi5 nanoparticles is 13.5 J/（kg K） at 5 K, while the corresponding value of the GdNis/Gd2O3 nanocapsuels is only 5.7 J/（kg K） at 31 K. The origin of the large magnetic entropy change of GdNi5 nanoparticles is ascribed to its high atomic moments and small anisotropy energy barrier induced by its small particle size.GdNi5 nanoparticles and GdNis/Gd2O3 nanocapsules （with GdNi5 core and Gd2O3 shell） were prepared by arcdischarge technique under different hydrogen partial pressure. The GdNi5 nanoparticles show irregular spherical shape and have a size distribution of 10-50 nm with an average diameter of 15 nm. In comparison, the GdNi5/Gd2O3 nanocapsules present spherical morphology and show a size distribution of 10-100 nm with an average diameter of 60 nm. Under a magnetic field change of 50 kOe, the maximum magnetic entropy change of GdNi5 nanoparticles is 13.5 J/（kg K） at 5 K, while the corresponding value of the GdNis/Gd2O3 nanocapsuels is only 5.7 J/（kg K） at 31 K. The origin of the large magnetic entropy change of GdNi5 nanoparticles is ascribed to its high atomic moments and small anisotropy energy barrier induced by its small particle size.

关 键 词：NANOPARTICLE Superparamagnetic property Cryogenic refrigeration Magnetocaloric effect NANOCAPSULE 

分 类 号：TB383.1[一般工业技术—材料科学与工程]