中国物理B ›› 2011, Vol. 20 ›› Issue (6): 67502-067502.doi: 10.1088/1674-1056/20/6/067502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Hydrogenation, structure and magnetic properties of La(Fe0.91Si0.09)13 hydrides and deuterides

王志翠1, 何伦华1, 王芳卫1, F. Cuevas2, M. Latroche2, 沈俊3   

  1. (1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Chimie Metallurgique des Terres Rares, ICMPE-CNRS UMR 7182, 2-8 rue Henri Dunant, 94320 Thiais, France; (3)Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2011-01-24 修回日期:2011-03-10 出版日期:2011-06-15 发布日期:2011-06-15
  • 基金资助:
    Project supported by the National Basic Research Program of China (973 Program) (Grant No. 2010CB833102), the Knowl- edge Innovation Project of the Chinese Academy of Sciences, and the National Natural Science Foundation of China (Grant Nos. 10974244 and 11004204).

Hydrogenation, structure and magnetic properties of La(Fe0.91Si0.09)13 hydrides and deuterides

Wang Zhi-Cui(王志翠)a), He Lun-Hua(何伦华)a), F. Cuevasb), M. Latrocheb), Shen Jun(沈俊)c), and Wang Fang-Wei(王芳卫) a)†   

  1. a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; b Chimie Metallurgique des Terres Rares, ICMPE-CNRS UMR 7182, 2-8 rue Henri Dunant, 94320 Thiais, France; c Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2011-01-24 Revised:2011-03-10 Online:2011-06-15 Published:2011-06-15
  • Supported by:
    Project supported by the National Basic Research Program of China (973 Program) (Grant No. 2010CB833102), the Knowl- edge Innovation Project of the Chinese Academy of Sciences, and the National Natural Science Foundation of China (Grant Nos. 10974244 and 11004204).

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摘要： Hydrogenation, crystal structure and magnetic properties of La(Fe0.91Si0.09)13H(D)y have been studied by pressure-composition isotherms (PCI), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and magnetization measurements. The maximum absorption capacity is found to be 1.9 H(D) atoms per formula unit as a solid solution. All hydrides and deuterides crystallize in the NaZn13-type cubic structure with the lattice parameter increasing linearly with H(D) concentration. The H(D) absorption enhances the Curie temperature significantly. The magnetic entropy change of the highly H-absorbed compound La(Fe0.91Si0.09)13H1.81 reaches ~26 J/kg·K under a magnetic field change of 5 T near the Curie temperature TC=350 K. No observable isotope effect seems to imply that only the magnetovolume effect is responsible for the strong interplay between magnetism and lattice.

Abstract: Hydrogenation, crystal structure and magnetic properties of La(Fe0.91Si0.09)13H(D)y have been studied by pressure-composition isotherms (PCI), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and magnetization measurements. The maximum absorption capacity is found to be 1.9 H(D) atoms per formula unit as a solid solution. All hydrides and deuterides crystallize in the NaZn13-type cubic structure with the lattice parameter increasing linearly with H(D) concentration. The H(D) absorption enhances the Curie temperature significantly. The magnetic entropy change of the highly H-absorbed compound La(Fe0.91Si0.09)13H1.81 reaches ~26 J/kg·K under a magnetic field change of 5 T near the Curie temperature TC=350 K. No observable isotope effect seems to imply that only the magnetovolume effect is responsible for the strong interplay between magnetism and lattice.

Key words: magnetocaloric effect, magnetic entropy change, isotope effect

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

  • 75.30.Sg
65.40.gd (Entropy) 67.63.Cd (Molecular hydrogen and isotopes)