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

Atsunori Kamegawa, Takuya Abiko, Masuo Okada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationTHERMEC 2013
EditorsB. Mishra, Mihail. Ionescu, T. Chandra
PublisherTrans Tech Publications Ltd
Pages1686-1691
Number of pages6
ISBN (Print)9783038350736
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013 - Las Vegas, NV, United States
Duration: 2013 Dec 22013 Dec 6

Publication series

NameMaterials Science Forum
Volume783-786
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

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

Keywords

  • Al-based hydride
  • High-pressure synthesis
  • Intermetallic compound

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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