放射光を利用したアルミニウム－遷移金属合金水素化物の高温高圧合成

抄録

Aluminum has low hydrogen affinity and aluminum-based alloy hydrides have rarely been reported so far. We have tried to obtain aluminum-based alloy hydride by hydrogenating alloys consisting of metals with low hydrogen affinities only. The first aluminum-based interstitial hydride Al₂CuH was obtained by hydrogenating Al₂Cu alloy at 10 GPa. However, other aluminum-based interstitial hydrides have yet to be obtained. We investigated hydrogenation reactions of other alloys consisting of metals with low hydrogen affinities only and have tried to obtain new classes of aluminum-based hydrides based on the obtained information. We have synthesized a novel hydride Al₃FeH₄. The obtained Al₃FeH₄ was turned out to be thermodynamically stable near ambient conditions. It is likely that unique structural units in Al₃FeH₄ stabilize the hydride.