Abstract
The ErFe 2-H system has been thermodynamically characterized from pressure-composition-temperature data. Six different solid phases form with five two-solid-phase coexistence regions; although, for one, the plateau pressure is not well defined over the temperature range investigated. The plateau pressures of the various two-phase regions must naturally increase with the average hydrogen content of the two-phase region; however, the enthalpies for hydride formation do not increase regularly with the plateau pressures. The D/H isotope effect, RT ln( p D 2 p H 2 ) 1 2 , is small and changes sign over the measured temperature range from 273 to 403 K. Disproportionation to ErH 2 ± δ and Fe occurs at elevated temperatures.
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