NaC
NaC has a DFT band gap of 0.56–3.73 eV across 40 reported structures in 13 space groups; its reference structure is tetragonal (I41/acd (No. 142)). Cross-validated across 3 computational databases.
CNa
At a glance
Key Properties
Cross-validated computational properties for NaC, 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.
0.56–3.73 eV
Range across DFT structures · ground state: insulator
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.
0.099 eV/atom
Best (lowest) across sources
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.
Metastable
3 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
40
3 databases, 13 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of NaC. 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.
0.47 / 1.00
Trust tier: low
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.132 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
3
jarvis, materials_project, oqmd
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Mixed (most: I41/acd (No. 142))
Crystallography
Reported Structures
Lowest-energy structures reported for NaC, 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. |
|---|---|---|---|---|---|
| Immm (No. 71) | orthorhombic | 3.73 | 0.0993 | 0.092 | — |
| I41/acd (No. 142) | tetragonal | 3.49 | 0.0999 | 0.092 | — |
| — | — | 3.68 | 0.1674 | 0.167 | — |
| — | — | 3.39 | 0.1677 | 0.168 | — |
| I41/acd (No. 142) | tetragonal | 3.40 | 0.2315 | -6.524 | 1.60 |
| Immm (No. 71) | orthorhombic | 3.49 | 0.2316 | -6.524 | 1.61 |
| — | — | 0.00 | 0.6007 | 0.601 | — |
| P4/nmm (No. 129) | tetragonal | 0.00 | 1.5799 | 1.572 | — |
| Pmmm (No. 47) | orthorhombic | 0.00 | 1.8904 | 1.883 | — |
| — | — | 0.00 | 2.1333 | 2.133 | — |
| — | — | 0.00 | 2.1517 | 2.152 | — |
| P-6m2 (No. 187) | hexagonal | 0.00 | 2.1587 | 2.151 | — |
Reference
Frequently Asked Questions
Common questions about NaC, answered from cross-validated data.
What is the band gap of NaC?
NaC has a DFT-computed band gap of 0.56–3.73 eV across 40 reported structures. Standard DFT underestimates band gaps, so the measured gap is typically larger.
More questions
Is NaC a metal, semiconductor, or insulator?
DFT predicts a wide band gap of up to 3.73 eV (an insulator or wide-band-gap material).
Is NaC thermodynamically stable?
NaC has a lowest energy above hull of 0.099 eV/atom (metastable).
What is the crystal structure of NaC?
The reference structure of NaC is tetragonal symmetry, space group I41/acd (No. 142).
How many polymorphs of NaC are known?
40 structures of NaC are reported across 3 databases, spanning 13 distinct space groups.
What elements does NaC contain?
NaC contains C and Na (2 elements).
Where does the data for NaC come from?
NaC data is cross-referenced from jarvis, oqmd, materials_project, cod, mpaloe.
Data sources & attribution
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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