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

doi:10.1088/1674-1056/20/6/067502

Abstract Hydrogenation, crystal structure and magnetic properties of La(Fe_0.91Si_0.09)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(Fe_0.91Si_0.09)₁₃H_1.81 reaches ~26 J/kg·K under a magnetic field change of 5 T near the Curie temperature T_C=350 K. No observable isotope effect seems to imply that only the magnetovolume effect is responsible for the strong interplay between magnetism and lattice.

Keywords: magnetocaloric effect magnetic entropy change isotope effect

Received: 24 January 2011
Revised: 10 March 2011
Accepted manuscript online:

PACS:	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	65.40.gd	(Entropy)
	67.63.Cd	(Molecular hydrogen and isotopes)

Fund: 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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Wang Zhi-Cui(王志翠), He Lun-Hua(何伦华), F. Cuevas, M. Latroche, Shen Jun(沈俊), and Wang Fang-Wei(王芳卫) Hydrogenation, structure and magnetic properties of La(Fe_0.91Si_0.09)₁₃ hydrides and deuterides 2011 Chin. Phys. B 20 067502

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

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Hydrogenation, structure and magnetic properties of La(Fe_0.91Si_0.09)₁₃ hydrides and deuterides