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ChemInform Abstract: Synthesis and Crystal Structure of the γ-Modifications of US2 and USe2.

✍ Scribed by H. KOHLMANN; H. P. BECK

Publisher
John Wiley and Sons
Year
2010
Weight
28 KB
Volume
28
Category
Article
ISSN
0931-7597

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✦ Synopsis

Synthesis and Crystal Structure of the γ-Modifications of US2 and USe2.

-Microcrystalline powders of γ-UX2 (X: S, Se) are prepared from U3X5 and X at 600 and 800 K, resp., in evacuated silica ampoules by a presumably topotactic reaction. γ-USe2 is also formed from . alpha.-USe2 at 4 GPa and 773 K. Rietveld refinement of the powder XRD data shows that the γ-phase adopts the hexagonal space group P62m (anti-Fe2P type structure). Structural relations to the educt, U3X5, and the reaction mechanism are discussed. -(KOHLMANN, H.;

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