C2Cs2
C2Cs2 is an insulating binary compound of carbon and cesium that is typically found in a metastable state.
About C2Cs2
C2Cs2 is a binary compound composed of carbon and cesium that exhibits wide-band-gap insulating behavior. Its electronic structure suggests a highly localized bonding environment typical of insulating materials within this chemical family.
Despite its existence in multiple structural configurations across various databases, the compound is characterized as being above the thermodynamic hull. This indicates that it is likely metastable or unstable under standard conditions, making it a subject of interest for fundamental studies in solid-state chemistry.
Key Properties
Cross-validated computational properties for C2Cs2, 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 C2Cs2, 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. |
|---|---|---|---|---|---|
| Pnma (No. 62) | orthorhombic | 3.11 | 0.3705 | -4.722 | 3.71 |
| — | — | — | — | — | 3.88 |
| Cmcm (No. 63) | — | — | — | — | — |
| Imma (No. 74) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| Cmcm (No. 63) | — | — | — | — | — |
| R-3m (No. 166) | — | — | — | — | — |
| P4/nmm (No. 129) | — | — | — | — | — |
Frequently Asked Questions
Common questions about C2Cs2, answered from cross-validated data.
What is C2Cs2?
C2Cs2 is an insulating binary compound of carbon and cesium that is typically found in a metastable state.
What is the band gap of C2Cs2?
Is C2Cs2 a metal, semiconductor, or insulator?
Is C2Cs2 thermodynamically stable?
What is the crystal structure of C2Cs2?
What is the density of C2Cs2?
How many polymorphs of C2Cs2 are known?
What elements does C2Cs2 contain?
Where does the data for C2Cs2 come from?
How It Compares
As a unique binary system, C2Cs2 occupies a distinct niche in materials research. Without direct structural analogs in its immediate class, it serves as an important reference point for understanding the interplay between alkali metal coordination and carbon-based anionic frameworks in insulating solids.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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