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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Anosovite-type V3O5: a new binary oxide of vanadium
1Institut für Chemie, TU Berlin, Straße des 17. Juni 135, D-10623 Berlin.
Inorganic Chemistry
|July 18, 2012
Summary
Researchers synthesized a new metastable vanadium oxide polymorph, V(3)O(5), with an anosovite-type structure. This discovery offers insights into vanadium oxide phases and their properties.
Area of Science:
- Solid-state chemistry
- Materials science
- Inorganic chemistry
Background:
- Vanadium oxides (VOx) exhibit diverse structures and properties.
- Understanding polymorphs is crucial for materials applications.
- V(3)O(5) has known monoclinic and other phases.
Purpose of the Study:
- To synthesize and characterize a new polymorph of V(3)O(5).
- To investigate the structural and energetic stability of the new phase.
- To explore the magnetic properties of the synthesized V(3)O(5) polymorph.
Main Methods:
- Synthesis via reaction of vanadium fluorides with a hydrogen-argon gas mixture.
- X-ray diffraction for structural determination.
- Quantum-chemical calculations for stability analysis.
- Phonon density of states calculations.
- Magnetic susceptibility measurements.
Main Results:
- Formation of a new V(3)O(5) polymorph with an orthorhombic anosovite-type structure.
- Anosovite-type structure is energetically less stable (15 kJ/mol) than the monoclinic Magnéli phase.
- Phonon calculations confirm the anosovite-type phase as a metastable polymorph.
- No magnetic ordering observed down to 3 K.
Conclusions:
- A novel, metastable V(3)O(5) polymorph with anosovite-type structure has been successfully synthesized.
- The anosovite-type V(3)O(5) is thermodynamically less stable than the Magnéli phase.
- The synthesized material exhibits no magnetic ordering at low temperatures, suggesting potential applications where magnetic interactions are undesirable.
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