Preparation, Structure, and Properties of V2GeO4F2—Chains of VO4F2 Octahedra in the First V(III) Metallate Fluoride |
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Authors: | S.N. AcharyA.K. Tyagi,J. Kö hler |
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Affiliation: | a Applied Chemistry Division, Bhabha Atomic Research Center, Mumbai, 400 085, Indiab Max-Planck-Insitut für Festkörperforschung Heisenbergstrasse 1, D-70569, Stuttgart, Germanyf1j.koehler@fkf.mpg.def1 |
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Abstract: | Powder samples of the new oxide fluoride V2GeO4F2 have been obtained by the reaction of appropriate amounts V2O3, VF3, and GeO2 at 700°C for 18 h in an argon-filled sealed platinum tube. V2GeO4F2 crystallizes in the space group Pnma with a=9.336(1), b=8.898 (1), and c=4.912 (1) Å. The structure has been refined from X-ray powder diffraction data using the Rietveld method (Rint=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 Å. The V are coordinated by four O 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. |
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Keywords: | vanadium oxide fluoride crystal structure magnetic properties. |
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