High-Pressure Synthesis of Novel Hydrides and Intermetallic Compound in Al-X Systems (X=Sr, V, Hf)

Atsunori Kamegawa; Takuya Abiko; Masuo Okada

doi:10.4028/www.scientific.net/MSF.783-786.1686

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786High-Pressure Synthesis of Novel Hydrides and...

High-Pressure Synthesis of Novel Hydrides and Intermetallic Compound in Al-X Systems (X=Sr, V, Hf)

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, Al₂V₃H_1.8_~_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.

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Materials Science Forum (Volumes 783-786)

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1686-1691

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https://doi.org/10.4028/www.scientific.net/MSF.783-786.1686

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May 2014

Authors:

Atsunori Kamegawa*, Takuya Abiko, Masuo Okada

Keywords:

Al-Based Hydride, High-Pressure Synthesis, Intermetallic Compound

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