Abstract
Powder neutron diffraction analysis has been used to determine hydrogen site occupation at room temperature in the lattice of the oxygen-stabilized Zr 4Pd 2O phase. For the composition Zr 4Pd 2OD 4.5 it was established that only two types of interstices, designated as D7 and D2, were occupied. Hydrogen in the D7 site is octahedrally surrounded by 6Zr. This site is nearly filled. In the D2 site hydrogen is tetrahedrally co-ordinated to 3Zr and Pd and is 1/3 filled. The distribution of hydrogen on the D2 sites is random.
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