title: Bixbyite-type V2O3--a metastable polymorph of vanadium sesquioxide.
abstract: 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 V(2)O(3) polymorph. At ~50 K a paramagnetic to canted antiferromagnetic transition is detected.
authors.affiliation: Institut für Chemie, TU Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Weber
authors.forename: A
authors.initials: A
authors.lastname: Stork
authors.forename: S
authors.initials: S
authors.lastname: Nakhal
authors.forename: C
authors.initials: C
authors.lastname: Wessel
authors.forename: C
authors.initials: C
authors.lastname: Reimann
authors.forename: W
authors.initials: W
authors.lastname: Hermes
authors.forename: A
authors.initials: A
authors.lastname: Müller
authors.forename: T
authors.initials: T
authors.lastname: Ressler
authors.forename: R
authors.initials: R
authors.lastname: Pöttgen
authors.forename: T
authors.initials: T
authors.lastname: Bredow
authors.forename: R
authors.initials: R
authors.lastname: Dronskowski
authors.forename: M
authors.initials: M
authors.lastname: Lerch