Zr2M型金属間化合物の水素誘起不均化

概要

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Hydrogen induced disproportionation and reproportionation of the metallic compounds, Zr2Fe, Zr2Co, Zr2Ni and Zr2Cu, were studied at 25 to 900℃ by X-ray diffraction. Zr2Fe, Zr2Co and Zr2vCu formed Zr-deficient compounds and ZrHx through disproportionation reactions at room temperatures as follows [ Zr2Fe : 9Zr2Fe + 18.5H2 → 5Zr3FeH7 + 2ZrFe2 + ZrH2 ]; [ Zr2Co : Zr2Co + 2.5H2 → ZrCoH3 + ZrH2 ]; [ Zr2Cu : Zr2Cu + H2 → ZrCu + ZrH2 ] ; [ Zr2Cu + 2.5H2 → CuH + 2ZrH2 ]; Zr2Ni formed only its hydride through Zr2Ni : Zr2Ni + 2.5H2 → Zr2NiH5 and did not disproportionate under the experimental conditions. The disproportionated Zr2Fe and Zr2Co reproportionated in hydrogen atmosphere at 550℃. The disproportionated Zr2Fe and Zr2Co did not reproportionate in hydrogen atmosphere: but only reproportionated in vacuum above 800℃. Differences in disproportionateon and reproportionation are considered due to relative stability of hydride and Zr-deficient intermetallic phase of the respective Zr-M systems.
富山大学の論文