TY - GEN
T1 - High-pressure synthesis of novel hydrides and intermetallic compound in Al-X systems (X = Sr, V, Hf)
AU - Kamegawa, Atsunori
AU - Abiko, Takuya
AU - Okada, Masuo
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - Al-based hydride
KW - High-pressure synthesis
KW - Intermetallic compound
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U2 - 10.4028/www.scientific.net/msf.783-786.1686
DO - 10.4028/www.scientific.net/msf.783-786.1686
M3 - Conference contribution
AN - SCOPUS:84904574914
SN - 9783038350736
T3 - Materials Science Forum
SP - 1686
EP - 1691
BT - THERMEC 2013
A2 - Mishra, B.
A2 - Ionescu, Mihail.
A2 - Chandra, T.
PB - Trans Tech Publications Ltd
T2 - 8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
Y2 - 2 December 2013 through 6 December 2013
ER -