Bixbyite-Type V2O3A Metastable Polymorph of Vanadium Sesquioxide

A metastable polymorph of vanadium sesquioxide was prepared by the reaction of vanadium trifluoride with a water-saturated gaseous mixture of 10 vol % hydrogen in argon. The new polymorph crystallizes in the bixbyite-type structure. At temperatures around 823 K a transformation to the well-known cor...

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Published inInorganic chemistry Vol. 50; no. 14; pp. 6762 - 6766
Main Authors Weber, D, Stork, A, Nakhal, S, Wessel, C, Reimann, C, Hermes, W, Müller, A, Ressler, T, Pöttgen, R, Bredow, T, Dronskowski, R, Lerch, M
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 18.07.2011
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Summary:A metastable polymorph of vanadium sesquioxide was prepared by the reaction of vanadium trifluoride with a water-saturated gaseous mixture of 10 vol % hydrogen in argon. The new polymorph crystallizes in the bixbyite-type structure. At temperatures around 823 K a transformation to the well-known corundum-type phase is observed. Quantum-chemical calculations show that the bixbyite-type structure is about 9 kJ/mol less stable than the known corundum-based one. This result, in combination with the absence of imaginary modes in the phonon density of states, supports the classification of the bixbyite-type phase as a metastable V2O3 polymorph. At ∼50 K a paramagnetic to canted antiferromagnetic transition is detected.
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ISSN:0020-1669
1520-510X
DOI:10.1021/ic200799n