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11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Bixbyite-type V2O3--a metastable polymorph of vanadium sesquioxide
1Institut für Chemie, TU Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany.
Inorganic Chemistry
|June 15, 2011
Summary
Researchers synthesized a new metastable vanadium sesquioxide (V2O3) polymorph with a bixbyite-type structure. This phase is less stable than the corundum form and exhibits a magnetic transition around 50 K.
Area of Science:
- Materials Science
- Solid State Chemistry
- Crystallography
Background:
- Vanadium sesquioxide (V2O3) is known to exist in several polymorphic forms.
- Understanding the phase behavior and stability of V2O3 is crucial for its applications.
Purpose of the Study:
- To synthesize and characterize a new metastable polymorph of vanadium sesquioxide.
- To investigate the structural, energetic, and magnetic properties of this new phase.
Main Methods:
- Synthesis via reaction of vanadium trifluoride with a hydrogen-argon gas mixture.
- X-ray diffraction for structural determination.
- Quantum-chemical calculations for stability analysis.
- Temperature-dependent magnetic susceptibility measurements.
Main Results:
- A novel metastable polymorph of V2O3 crystallizing in the bixbyite-type structure was successfully prepared.
- The bixbyite-type structure transforms to the corundum-type phase around 823 K.
- Quantum-chemical calculations indicated the bixbyite-type structure is metastable, being ~9 kJ/mol less stable than the corundum form.
- A paramagnetic to canted antiferromagnetic transition was observed at approximately 50 K.
Conclusions:
- The synthesized bixbyite-type V2O3 is confirmed as a metastable polymorph.
- The study provides insights into the phase diagram and magnetic properties of vanadium sesquioxide.
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