Abstract
After melting and quenching, the ternary silicides U 2Fe 17- y Si y exist far 3.3 ≤ y ≤ 4.5 but they partially decompose after annealing at 850-900°C. Their crystal structure, determined by X-ray diffractometry on both single crystals and powder, derives from the hexagonal Th 2Ni 17-type but depends strongly on the silicon content. For y = 3.7 some uranium sites are partially replaced by pairs of iron atoms and conversely. This structure shows some similarities to that observed for the binary compound Ho 2Fe 17. On the other hand, for y = 4.2, all the uranium atoms and pairs of iron atoms are statistically distributed. In contrast, the ternary silicide U 2Co 15Si 2, which is obtained as single phase after annealing at 850°C, adopts the Th 2Ni 17-type structure. In all compounds, iron or cobalt atoms of the pair are never substituted by silicon atoms.
Published Version
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