Preparation, structure, and properties of V2GeO4F2 - Chains of VO4F2 Octahedra 
in the First V(III) Metallate Fluoride

Achary, S. N.; Tyagi, A. K.; Köhler, J.

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Preparation, structure, and properties of V₂GeO₄F₂ - Chains of VO₄F₂ Octahedra in the First V(III) Metallate Fluoride

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Tyagi, A. K.
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Köhler, J.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Achary, S. N., Tyagi, A. K., & Köhler, J. (2002). Preparation, structure, and properties of V₂GeO₄F₂ - Chains of VO₄F₂ Octahedra in the First V(III) Metallate Fluoride. Journal of Solid State Chemistry, 165(1), 74-78.

Cite as: https://hdl.handle.net/21.11116/0000-000E-EE69-1

Abstract

Powder samples of the new oxide fluoride V2GeO4F2 have been
obtained by the reaction of appropriate amounts V2O3, VF3, and
GeO2 at 700 degreesC for 18h in an argon-filled sealed platinum
tube. V2GeO4F2 crystallizes in the space group Pnma with a =
9.336(1), h=8.898 (1), and c=4.912 (1)Angstrom. The structure
has been refined from X-ray powder diffraction data using the
Rietveld method (R-int = 5.5% and RP = 9.8%). The structure of
V2GeO4F2 exhibits close packed layers of the anions with an
ordering of O and F. The characteristic building units are
discrete GeO4 tetrahedra with Ge-O distances of 1.75-1.80
Angstrom. The V are coordinated by four 0 and two F to form
VO4F2 octahedra connected via two common edges to give zigzag
chains. These chains are linked via corners to form a three-
dimensional network. The temperature dependence of the magnetic
susceptibility of V2GeO4F2 indicates antiferromagnetic
correlations. (C) 2002 Elsevier Science (USA).