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ID 20043
本文ファイル
著者
Hino, Satoshi
Leng, Haiyan
Fujii, Hironobu
キーワード
Hydrogen storage materials
Gas-solid reactions
High-energy ball milling
Mechanochemical synthesis
Thermal analysis
NDC
物理学
抄録(英)
After synthesizing calcium amide (Ca(NH2)2) through the reaction of calcium hydride (CaH2) with ammonia (NH3), the thermal decomposition properties have been examined. The results indicated that Ca(NH2)2 decomposed to calcium imide (CaNH) and NH3 gas with increasing temperature, where the desorption of NH3 started from about 60 °C and peaked around 300 °C in the thermal desorption mass spectra (TDMS). From the X-ray diffraction profiles, the product after heat treatment up to 350 °C was CaNH, but an unknown phase appeared in further heating up to 500 °C. Hydrogen (H2) desorption properties of a mixture of Ca(NH2)2 and CaH2 with 1:3 molar ratio were also examined. The H2 gas of 3.5 wt.% in total was desorbed with two-peak structure in TDMS. The first peak corresponds to the reaction: Ca(NH2)2 + CaH2 → 2CaNH + 2H2, and the second one originates in the reaction: CaNH + CaH2 → Ca2NH + H2. Simultaneously performed differential thermal analysis indicated that the former and the latter reactions were respectively exothermic and endothermic, so that the H2 desorption corresponding to the first peak in TDMS disappeared after long time milling at room temperature.
掲載誌名
Journal of Alloys and Compounds
398巻
1-2号
開始ページ
62
終了ページ
66
出版年月日
2005-08-02
出版者
Elsevier B.V.
ISSN
0925-8388
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2005 Elsevier B.V.
関連情報URL
部局名
先端物質科学研究科
自然科学研究支援開発センター
先進機能物質研究センター