Abstract
The structure of amorphous Ni 56Dy 44, loaded with 32 at% and 60 at% hydrogen, was investigated by X-ray and neutron diffraction using the isotopic substitution method. The results are discussed on the basis of the pair distribution functions. The incorporation of hydrogen atoms causes a change of the Ni–Dy matrix, i.e., an increase of the atomic distances and of the coordination numbers, in particular those of the Dy–Dy correlations. The H-atoms are preferentially located in a tetrahedral Dy-coordination, but also some hydrogen–Ni coordination was found. The hydrogen–metal distances agree with the distances between tetrahedral interstitial sites and the metal atoms in the crystalline hydrides DyH 2 and Ni 57H 43. A distance correlation between the hydrogen atoms was found at 2.78 Å.
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