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ID 20039
file
creator
Nakagawa, Tessui
Iida, Ryo
Leng, Haiyan
Takeichi, Nobuhiko
Kiyobayashi, Tetsu
Takeshita, Hiroyuki
Fujii, Hironobu
subject
hydrogen absorbing materials
crystal growth
gas-solid reactions
X-ray diffraction
NDC
Physics
abstract
The in-situ XRD measurements on dehydrogenation/rehydrogenation of the Li-Mg-N-H system were performed in this work. The ballmilled mixture of 8LiH and 3Mg(NH2)2 as a hydrogenated phase gradually changed into Li2NH as a dehydrogenated phase during heat-treatment at 200 °C in vacuum for 50 h. Neither Mg-related phases nor other intermediate phases were recognized in the dehydrogenated phase. With respect to the hydrogenation process, the dehydrogenated state gradually returned to the mixed phase of the LiH and Mg(NH2)2 without appearance of any intermediate phases during heat treatment at 200 °C under 5 MPa H2 for 37 h and during slow cooling down to room temperature through 24 h. In the hydrogenation process at 200 °C under 1 MPa H2, however, the growing up of the LiNH2 and LiH phase was observed in the XRD profiles before the 3Mg(NH2)2 and 8LiH phases were formed as the final hydrogenated state. This indicates that the LiNH2 and LiH phase essentially appears as an intermediate state in the Li-Mg-N-H system composed of 3Mg(NH2)2 and 8LiH.
journal title
Journal of Alloys and Compounds
volume
Volume 430
issue
Issue 1-2
start page
217
end page
221
date of issued
2007-03-14
publisher
Elsevier B.V.
issn
0925-8388
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2006 Elsevier B.V.
relation url
department
Graduate School of Advanced Sciences of Matter
Natural Science Center for Basic Research and Development
Institute for Advanced Materials Research