Anosovite-type V3O5: a new binary oxide of vanadium.
The reaction of either V(2)F(6)·4H(2)O or a mixture of 60 wt % VF(2)·4H(2)O and 40 wt % VF(3)·3H(2)O with a water-saturated gaseous mixture of 15-20 vol % hydrogen in argon leads to the formation of a new polymorph of V(3)O(5) crystallizing in the orthorhombic anosovite-type structure. Quantum-chemical calculations show that the anosovite-type structure is about 15 kJ/mol less stable than the corresponding monoclinic Magnéli phase. In addition, there are no imaginary modes in the phonon density of states, supporting the classification of the anosovite-type phase as a metastable V(3)O(5) polymorph. Susceptibility measurements down to 3 K reveal no hint for magnetic ordering.
Institut für Chemie, TU Berlin, Straße des 17. Juni 135, D-10623 Berlin.
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Weber
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Wessel
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Reimann
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Schwickert
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Müller
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Ressler
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Pöttgen
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Bredow
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Dronskowski
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Lerch