WI2
tungsten diiodide · tungsten(II) iodide
Tungsten diiodide is a binary inorganic compound composed of tungsten and iodine. It is primarily utilized as a precursor in chemical synthesis and materials research for the preparation of other tungsten-based compounds.
Key Properties
Cross-validated computational properties for tungsten diiodide, aggregated across 3 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 WI2, 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. |
|---|---|---|---|---|---|
| Cmce (No. 64) | orthorhombic | 1.96 | 0.0000 | -5.797 | 6.40 |
| P-1 (No. 2) | Triclinic | — | — | — | 8.89 |
| P1 (No. 1) | Triclinic | — | — | — | 6.37 |
| P1 (No. 1) | Triclinic | — | — | — | 6.18 |
| C2/m (No. 12) | Monoclinic | — | — | — | 8.05 |
| C2/m (No. 12) | Monoclinic | — | — | — | 7.88 |
| P-1 (No. 2) | Triclinic | — | — | — | 8.66 |
| P1 (No. 1) | Triclinic | — | — | — | 6.57 |
| P1 (No. 1) | Triclinic | — | — | — | 8.02 |
| P1 (No. 1) | Triclinic | — | — | — | 7.52 |
| P1 (No. 1) | Triclinic | — | — | — | 6.29 |
| P-1 (No. 2) | Triclinic | — | — | — | 7.99 |
Applications
Where tungsten diiodide is used.
Frequently Asked Questions
Common questions about tungsten diiodide, answered from cross-validated data.
What is WI2?
Tungsten diiodide is a binary inorganic compound composed of tungsten and iodine. It is primarily utilized as a precursor in chemical synthesis and materials research for the preparation of other tungsten-based compounds.
What is WI2 used for?
What is the band gap of WI2?
Is WI2 a metal, semiconductor, or insulator?
Is WI2 thermodynamically stable?
What is the crystal structure of WI2?
What is the density of WI2?
How many polymorphs of WI2 are known?
What elements does WI2 contain?
Where does the data for WI2 come from?
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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