Abstract
In situ XRD measurements at high temperatures and high hydrogen pressures were performed on Fe–H alloys, and in combination with all available data a p(H 2)– T diagram was constructed up to p(H 2)=10 GPa and T=1500 °C. A drastic reduction of the melting point with dissolution of hydrogen, down to 800 °C at 3 GPa, was observed. In the f.c.c. phase, a gradual lattice contraction due to superabundant vacancy formation was found to take place over several hours. The lattice parameter at 784 °C, 4.7 GPa decreased by 6%, which implies that a vacancy concentration as high as 19 at.% was attained.
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