このエントリーをはてなブックマークに追加
ID 20038
file
creator
Okamoto, Keisuke
Tokoyoda, Kazuhiko
Fujii, Hironobu
subject
hydrogen storage materials
mechanochemical synthesis
X-ray diffraction
thermal analysis
NDC
Physics
abstract
We successfully established a method to synthesize the Li-Mg-N-H hydrogen storage system composed of Mg(NH2)2 and LiH from Mg and LiNH2 as starting materials. First of all, Mg and Li2NH were homogeneously mixed by ball-milling for 2 h under 1 MPa argon atmosphere. After that, the mixture was heat-treated at 250 °C for 16 h under vacuum condition to be transformed into Mg3N2 and Li2NH. Target materials, Mg(NH2)2 and LiH, were synthesized by a further heat-treatment for Mg3N2 and Li2NH at 200 °C under 10 MPa hydrogen atmosphere for 12 h. The phases in the sample at each processing stage were examined by X-ray diffraction and Fourier transformation infra-red absorption measurements and confirmed to be the expected ones. From experimental results of a thermal desorption mass spectroscopy, the final hydrogenated sample indicated that ~7 mass% hydrogen was desorbed starting from about 150 °C and peaked around 230 °C under helium flow condition at 5 °C/min heating rate without ammonia emission in our experimental accuracy.
journal title
Journal of Alloys and Compounds
volume
Volume 432
issue
Issue 1-2
start page
289
end page
292
date of issued
2007-04-25
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
Natural Science Center for Basic Research and Development
Institute for Advanced Materials Research