Electronic structure and thermodynamics of V2O3 polymorphs.
A metastable bixbyite-type polymorph of vanadium sesquioxide, V(2)O(3), has recently been synthesized, and it transforms to the corundum-type phase at temperatures around 550 °C. The possibility of a paramagnetic to canted antiferromagnetic or even spin-glass-like transition has been discussed. Quantum-chemical calculations on the density-functional theory level including explicit electronic correlation confirm the metastability as well as the semiconducting behavior of the material and predict that the bixbyite-type structure is about 0.1 eV less stable than the well-known corundum-type phase. Nonetheless, quasiharmonic phonon calculations manifest that bixbyite-type vanadium sesquioxide is a dynamically stable compound. Other possible V(2)O(3) polymorphs are shown to be even less suitable candidates for the composition V(2)O(3).
Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany.
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Wessel
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Müller
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Dronskowski