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- W2048883135 abstract "First attempts to synthesize a lanthanoid(III) oxide fluoride sulfide were successful by reacting DyF 3 and Dy 2 O 3 with dysprosium and sulfur in a 2 : 5 : 1 : 3 molar ratio at 850 ◦ C in tightly sealed tantalum ampoules. In analogy to the dysprosium compound Dy 3 OF 5 S, the other representatives of the M 3 OF 5 S series with M = Nd, Sm, Gd-Ho could be prepared as well. Almost phase-pure samples were obtained under similar flux-assisted (NaCl) conditions according to 2M +5MF 3 +M 2 O 3 + 3S →3M 3 OF 5 S. In the hexagonal crystal structure (space group: P6 3 /m; a ≈ 961 - 939 pm, c ≈ 378 - 367 pm; c/a≈0.39,Vm ≈91 - 84 cm 3 mol −1 , Z = 2), the M 3+ cations reside in ninefold anionic coordination realized as tricapped trigonal prisms formed by seven light (O 2− /F − ) and two heavier S 2− anions. One light-anion position exhibits the exclusive character of F − in trigonal non-planar coordination (CN = 3), while the other position with a tetrahedral cationic environment (CN = 4) is mixed occupied by F − and O 2− in a 2 : 1 ratio. The S 2− anions are coordinated in a trigonal prismatic way by six M 3+ cations. From the data of single-crystal X-ray structure analyses, no indication of any ordering for the O 2− and F − anions could be obtained, but bond-valence and MAPLE calculations confirmed the results of electron-beam microanalyses carried out earlier to reveal ordered models for Dy 3 OF 5 S." @default.
- W2048883135 created "2016-06-24" @default.
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- W2048883135 date "2011-03-01" @default.
- W2048883135 modified "2023-09-25" @default.
- W2048883135 title "Oxidfluoridsulfide der Lanthanoide vom Formeltyp M3OF5S (M = Nd, Sm, Gd–Ho) / Oxide Fluoride Sulfides of the Lanthanoids with the Formula M3OF5S (M = Nd, Sm, Gd–Ho)" @default.
- W2048883135 doi "https://doi.org/10.1515/znb-2011-0301" @default.
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