CI2
This compound is a highly unstable chemical species consisting of carbon and iodine. Due to its extreme reactivity and tendency to decompose, it is primarily studied in specialized laboratory settings rather than used in practical applications.
Key Properties
Cross-validated computational properties for CI2, aggregated across 4 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 CI2, 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. |
|---|---|---|---|---|---|
| P21/c (No. 14) | monoclinic | 2.58 | 0.2902 | -3.803 | 3.55 |
| P3m1 (No. 156) | Trigonal | — | — | — | 6.59 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.91 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.92 |
| Cmm2 (No. 35) | Orthorhombic | — | — | — | 5.89 |
| Cm (No. 8) | Monoclinic | — | — | — | 8.00 |
| P1 (No. 1) | Triclinic | — | — | — | 3.21 |
| Cc (No. 9) | Monoclinic | — | — | — | 5.05 |
| P3m1 (No. 156) | Trigonal | — | — | — | 4.46 |
| P1 (No. 1) | Triclinic | — | — | — | 4.14 |
| P1 (No. 1) | Triclinic | — | — | — | 4.52 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.54 |
Frequently Asked Questions
Common questions about CI2, answered from cross-validated data.
What is CI2?
This compound is a highly unstable chemical species consisting of carbon and iodine. Due to its extreme reactivity and tendency to decompose, it is primarily studied in specialized laboratory settings rather than used in practical applications.
What is the band gap of CI2?
Is CI2 a metal, semiconductor, or insulator?
Is CI2 thermodynamically stable?
What is the crystal structure of CI2?
What is the density of CI2?
How many polymorphs of CI2 are known?
What elements does CI2 contain?
Where does the data for CI2 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.
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