High-pressure synthesis of novel hydrides and intermetallic compound in Al-X systems (X = Sr, V, Hf)

Atsunori Kamegawa, Takuya Abiko, Masuo Okada

研究成果: Conference contribution

抄録

Al-based hydrides have been extensively investigated in order to their application for hydrogen storage. To explore new hydrides, the samples in Al-X-H systems (X = Sr, V, Hf) were synthesized at 873-1173 K for 2-8 h under 5 GPa with internal hydrogen source. Unidentified phases in XRD analysis were observed in samples with nominal composition of Al-50mol%SrH2, AlH3-60mol%VH2 and Al-50mol%HfH2. Judging from SEM-EDX analysis, the chemical composition of these phases were Al/Sr=1/1, Al/V=2/3 and Al/Hf=1/2. In Al-Sr system, hydrogen content was determined to be about 2.78mass% by fusion analysis. Corresponding chemical formula of the new hydride was estimated to be AlSrH3 with a perovskite-type crystal structure. Hydrogen desorption of 0.55 mass%H in the Al-60V sample was observed above about 400K by TG-TDS. The new compound, Al2V3H1.8~2.2 had a tetragonal structure. In Al-Hf system, the new compound had almost no hydrogen. Then, the chemical fomula of newly founf compound was estimated to be AlHf2 with a tetragonal structure.

本文言語English
ホスト出版物のタイトルTHERMEC 2013
編集者B. Mishra, Mihail. Ionescu, T. Chandra
出版社Trans Tech Publications Ltd
ページ1686-1691
ページ数6
ISBN(印刷版)9783038350736
DOI
出版ステータスPublished - 2014
外部発表はい
イベント8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013 - Las Vegas, NV, United States
継続期間: 2013 12 22013 12 6

出版物シリーズ

名前Materials Science Forum
783-786
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
国/地域United States
CityLas Vegas, NV
Period13/12/213/12/6

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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