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Preparation, Structure, and Properties of V2GeO4F2—Chains of VO4F2 Octahedra in the First V(III) Metallate Fluoride

✍ Scribed by S.N. Achary; A.K. Tyagi; J. Köhler

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
331 KB
Volume
165
Category
Article
ISSN
0022-4596

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✦ Synopsis

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 ˚. The structure has been refined from X-ray powder diffraction data using the Rietveld method (R int =5.5% and R p =9.8%). The structure of V 2 GeO 4 F 2 exhibits close packed layers of the anions with an ordering of O and F. The characteristic building units are discrete GeO 4 tetrahedra with Ge-O distances of 1.75-1.80 A ˚. The V are coordinated by four O and two F to form VO 4 F 2 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 V 2 GeO 4 F 2 indicates antiferromagnetic correlations.

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