CoCl2
Cobalt(II) chloride · Cobaltous chloride
Cobalt(II) chloride is a versatile inorganic compound that typically exists in a hydrated form characterized by its distinct color change upon exposure to moisture. It is widely utilized as a chemical indicator for the presence of water and serves as a precursor for the synthesis of other cobalt-based materials.
Key Properties
Cross-validated computational properties for Cobalt(II) chloride, 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 CoCl2, 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. |
|---|---|---|---|---|---|
| R-3m (No. 166) | trigonal | 0.08 | 0.0000 | -9.456 | 3.34 |
| P-3m1 (No. 164) | trigonal | 0.08 | 0.0012 | -9.455 | 3.33 |
| P-3m1 (No. 164) | trigonal | 0.09 | 0.0116 | -9.444 | 1.21 |
| C2/m (No. 12) | monoclinic | 0.06 | 0.1983 | -9.258 | 3.54 |
| Cm (No. 8) | Monoclinic | — | — | — | 3.97 |
| P1 (No. 1) | Triclinic | — | — | — | 5.67 |
| Cm (No. 8) | Monoclinic | — | — | — | 3.25 |
| Cm (No. 8) | Monoclinic | — | — | — | 3.62 |
| P-3m1 (No. 164) | Trigonal | — | — | — | 1.22 |
| P-1 (No. 2) | Triclinic | — | — | — | 3.16 |
| Cmcm (No. 63) | Orthorhombic | — | — | — | 5.60 |
| P-1 (No. 2) | Triclinic | — | — | — | 3.02 |
Applications
Where Cobalt(II) chloride is used.
Frequently Asked Questions
Common questions about Cobalt(II) chloride, answered from cross-validated data.
What is CoCl2?
Cobalt(II) chloride is a versatile inorganic compound that typically exists in a hydrated form characterized by its distinct color change upon exposure to moisture. It is widely utilized as a chemical indicator for the presence of water and serves as a precursor for the synthesis of other cobalt-based materials.
What is CoCl2 used for?
What is the band gap of CoCl2?
Is CoCl2 a metal, semiconductor, or insulator?
Is CoCl2 thermodynamically stable?
What is the crystal structure of CoCl2?
What is the density of CoCl2?
How many polymorphs of CoCl2 are known?
What elements does CoCl2 contain?
Where does the data for CoCl2 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.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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