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Updated: Jun 26, 2026
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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
New vanadium(IV) and titanium(IV) oxyfluorotellurates(IV): V2Te2O7F2 and TiTeO3F2.
Jean Paul Laval1, Nefla Jennene Boukharrata
1Science des Procédés Céramiques et de Traitements de Surface, UMR-CNRS 6638, Faculté des Sciences et Techniques, Université de Limoges, 123 Avenue A. Thomas, Limoges 87060, France. jean-paul.laval@unilim.fr
Summary
Two new oxyfluorotellurate(IV) compounds, TiTeO(3)F(2) and V(2)Te(2)O(7)F(2), were synthesized and structurally characterized. These materials exhibit high thermal and chemical stability, suggesting potential nonlinear optical applications.
Area of Science:
- Solid-state chemistry
- Inorganic materials science
- Crystallography
Background:
- Oxyfluorotellurates(IV) are explored for nonlinear optical properties.
- Previous studies characterized MTeO(3)F phases with trivalent cations.
- Understanding structure-property relationships in these materials is ongoing.
Purpose of the Study:
- To synthesize and characterize two new oxyfluorotellurate(IV) phases: titanium(IV) tellurium(IV) trioxide difluoride (TiTeO(3)F(2)) and divanadium(IV) ditellurium(IV) heptaoxide difluoride (V(2)Te(2)O(7)F(2)).
- To investigate the structural features and stability of these novel compounds.
- To contribute to the growing family of oxyfluorotellurates(IV).
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Chemical and thermal stability analysis.
- Analysis of polyhedral coordination and anion ordering.
Main Results:
- TiTeO(3)F(2) features linear double rows of TiO(3)F(3) polyhedra connected by Te(2)O(5) bipolyhedra.
- V(2)Te(2)O(7)F(2) exhibits zigzag chains of VO(4)F(2) octahedra linked by Te(2)O(5) bipolyhedra, forming mixed layers.
- Both structures show stereochemically active electronic lone pairs on Te(IV) and possess high thermal and chemical stability due to the absence of direct Te-F bonds.
Conclusions:
- TiTeO(3)F(2) and V(2)Te(2)O(7)F(2) are new, stable members of the oxyfluorotellurate(IV) family.
- The structural diversity, including anion ordering and polyhedral arrangements, is highlighted.
- The inherent stability suggests potential for applications, possibly in nonlinear optics.
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