CNO
CNO is a metastable, semiconducting compound composed of carbon, nitrogen, and oxygen that exists in several distinct structural forms.
About CNO
CNO is a complex chemical species composed of carbon, nitrogen, and oxygen. As a semiconducting material, it exhibits electronic properties that bridge the gap between conductors and insulators, making it a subject of interest for fundamental studies in materials science.
Due to its position above the thermodynamic hull, this compound is considered metastable. Despite its inherent instability, researchers have identified various structural configurations, highlighting the intricate bonding possibilities within this elemental combination.
Key Properties
Cross-validated computational properties for CNO, 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of CNO. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for CNO, 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 | 0.00 | 0.8986 | -7.492 | 1.06 |
| P212121 (No. 19) | orthorhombic | 1.85 | 1.1348 | -7.087 | 1.46 |
| Pbca (No. 61) | orthorhombic | 1.51 | 1.9594 | -6.263 | 1.14 |
| P21/m (No. 11) | Monoclinic | — | — | — | 4.29 |
| P21 (No. 4) | Monoclinic | — | — | — | 2.77 |
| P21/m (No. 11) | Monoclinic | — | — | — | 3.15 |
| P-421m (No. 113) | tetragonal | — | — | — | 0.46 |
| Pna21 (No. 33) | orthorhombic | — | — | — | 0.37 |
Frequently Asked Questions
Common questions about CNO, answered from cross-validated data.
What is CNO?
CNO is a metastable, semiconducting compound composed of carbon, nitrogen, and oxygen that exists in several distinct structural forms.
What is the band gap of CNO?
Is CNO a metal, semiconductor, or insulator?
Is CNO thermodynamically stable?
What is the crystal structure of CNO?
What is the density of CNO?
How many polymorphs of CNO are known?
What elements does CNO contain?
Where does the data for CNO come from?
How It Compares
As an unclassified compound, CNO represents a unique entry in materials databases. Unlike more conventional stable oxides or nitrides, its metastable nature places it in a distinct category of experimental materials that require specialized synthesis conditions to stabilize.
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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