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Updated: May 1, 2026
11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Structure and properties of bimetallic titanium and vanadium oxide clusters
Benjamin Helmich1, Marek Sierka, Jens Döbler
1Humboldt-Universität zu Berlin, Institut für Chemie, Unter den Linden 6, D-10099 Berlin, Germany. js@chemie.hu-berlin.de.
Physical Chemistry Chemical Physics : PCCP
|March 27, 2014
Summary
This study explores stable structures of titanium and vanadium oxide clusters using computational methods. Vanadium oxo groups are key to stability, with structure depending on composition, impacting oxidative power.
Area of Science:
- Materials Science
- Computational Chemistry
- Inorganic Chemistry
Background:
- Bimetallic oxide clusters are crucial in catalysis and materials science.
- Understanding their structure-property relationships is essential for designing new materials.
- Titanium and vanadium oxides offer tunable electronic and catalytic properties.
Purpose of the Study:
- To determine the most stable minimum energy structures of bimetallic titanium-vanadium oxide clusters with four metal atoms.
- To investigate the influence of composition and stoichiometry on cluster structure and stability.
- To evaluate the oxidative power of selected cluster compositions.
Main Methods:
- Utilized a genetic algorithm combined with density functional theory (DFT) calculations (B3LYP functional).
- Investigated cluster compositions: VnTin-4O10(-) (n=1-4), (TiO2)VOn(-) (n=1-4), and (TiO2)VOn(+) (n=1-3).
- Analyzed structural motifs, magnetic coupling, and simulated infrared spectra.
Main Results:
- Vanadium oxo groups are integral to stable structures, except for (TiO2)3VO(-).
- Anti-ferromagnetic coupling significantly lowers energy when spin centers are adjacent.
- Vanadium-rich/oxygen-poor clusters favor symmetric cage structures, while vanadium-poor/oxygen-rich clusters exhibit diverse motifs.
- Non-symmetric cages for Ti4O10(-) were found to be more stable than symmetric ones.
- Simulated IR spectra of adamantane-like cages matched experimental data best.
- Oxidative power varied, with pure vanadium oxides showing higher potential than mixed oxides.
Conclusions:
- The stability and structure of titanium-vanadium oxide clusters are highly dependent on their composition and stoichiometry.
- Computational methods effectively predict stable structures and properties of these complex systems.
- Structural diversity in vanadium-poor/oxygen-rich clusters offers avenues for novel material design.
- The adamantane-like cage structure, despite not always being the most stable, best reproduces experimental vibrational spectra.
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