W2O5
W2O5 is a metastable semiconducting oxide of tungsten used in the study and development of electrochromic materials.
About W2O5
W2O5 is a semiconducting oxide that belongs to the class of refractory-metal oxides. As a metastable phase, it represents a unique structural arrangement within the tungsten-oxygen system, offering distinct electronic properties that are of significant interest for advanced material design.
This compound is primarily investigated for its potential in electrochromic devices, where its ability to undergo reversible color changes is highly valued. Its existence as a metastable phase makes it a compelling subject for researchers aiming to tune the performance of transition metal oxides in thin-film technologies.
Key Properties
Cross-validated computational properties for W2O5, aggregated across 2 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for W2O5, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| Pmmn (No. 59) | orthorhombic | 0.00 | 0.0763 | -9.285 | 7.38 |
| Cmcm (No. 63) | orthorhombic | 0.00 | 0.2477 | -9.114 | 6.50 |
| Pba2 (No. 32) | orthorhombic | 0.97 | 0.2497 | -9.112 | 6.57 |
| Cmcm (No. 63) | orthorhombic | 2.39 | 0.2607 | -9.101 | 5.45 |
| R3m (No. 160) | Trigonal | — | — | — | 13.94 |
| C2/m (No. 12) | Monoclinic | — | — | — | 7.39 |
| P2/m (No. 10) | Monoclinic | — | — | — | 5.69 |
| R3m (No. 160) | Trigonal | — | — | — | 11.66 |
| P-1 (No. 2) | Triclinic | — | — | — | 7.90 |
| Cm (No. 8) | Monoclinic | — | — | — | 7.74 |
| C2/m (No. 12) | Monoclinic | — | — | — | 7.68 |
| Cm (No. 8) | Monoclinic | — | — | — | 13.91 |
Applications
Where W2O5 is used.
Frequently Asked Questions
Common questions about W2O5, answered from cross-validated data.
What is W2O5?
W2O5 is a metastable semiconducting oxide of tungsten used in the study and development of electrochromic materials.
What is W2O5 used for?
What is the band gap of W2O5?
Is W2O5 a metal, semiconductor, or insulator?
Is W2O5 thermodynamically stable?
What is the crystal structure of W2O5?
What is the density of W2O5?
How many polymorphs of W2O5 are known?
What elements does W2O5 contain?
Where does the data for W2O5 come from?
How It Compares
Within the electrochromic and refractory-metal oxides class.
Within the family of refractory-metal oxides, W2O5 occupies a niche position compared to more common members like WO3 or V2O5. While WO3 is widely utilized as a standard electrochromic material, W2O5 offers a different stoichiometry that influences its electronic character and structural stability, providing a specialized alternative for applications where specific metastable phase behaviors are required.
Related Compounds
Other Electrochromic and Refractory-Metal Oxides in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
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