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Synthesis and Structure of a New Germanate Fluoride: NaCa2GeO4F

✍ Scribed by L.F. Schneemeyer; Lila Guterman; T. Siegrist; G.R. Kowach

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
416 KB
Volume
160
Category
Article
ISSN
0022-4596

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✦ Synopsis

We report the synthesis and structural characterization of a new oxoanion halide, NaCa 2 GeO 4 F. Crystal data: FW ‫؍‬ 235.74, Pnma (No. 62), orthorhombic, a ‫؍‬ 5.362(2), b ‫؍‬ 7.328(3), c ‫؍‬ 12.681(4) A > , V ‫؍‬ 498.3(3) A > 3 , Z ‫؍‬ 4, R(F) ‫؍‬ 0.044, R w (F) ‫؍‬ 0.046 for 404 averaged re6ections. Compositionally, this material can be viewed as the end-member of the hypothetical solid solution Ca 2 GeO 4 ' (CaO) 1؊x ' (NaF) x . However, in this unusual oxy6uoride, the 6uoride ion orders and fully occupies one anion site. The structure consists of complicated condensed chains of six-coordinated cations centered by 6uoride ions and linked by chains of isolated germanium oxide tetrahedra. The structure is best described in terms of the anion packing rather than the packing of cation-centered coordination polyhedra.

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Preparation, Structure, and Properties of V2GeO4F2β€”Chains of VO4F2 Octahedra in the First V(III) Metallate Fluoride
✍ S.N. Achary; A.K. Tyagi; J. KΓΆhler πŸ“‚ Article πŸ“… 2002 πŸ› Elsevier Science 🌐 English βš– 331 KB

Powder samples of the new oxide fluoride V 2 GeO 4 F 2 have been obtained by the reaction of appropriate amounts V 2 O 3 , VF 3 , and GeO 2 at 7001C for 18 h in an argon-filled sealed platinum tube. V 2 GeO 4 F 2 crystallizes in the space group Pnma with a=9.336(1), b=8.898 (1), and c=4.912 (1) A ˚.