NaAs
NaAs is a stable semiconducting binary compound formed from sodium and arsenic.
About NaAs
NaAs is a binary inorganic compound composed of sodium and arsenic. As a thermodynamically stable material situated on the convex hull, it represents a robust phase that maintains structural integrity under standard conditions.
This compound exhibits semiconducting electronic character, making it a subject of interest for fundamental studies in solid-state physics. Its existence across multiple databases reflects its significance as a well-characterized material within the broader landscape of alkali metal pnictides.
Key Properties
Cross-validated computational properties for NaAs, 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 NaAs. 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 NaAs, 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. |
|---|---|---|---|---|---|
| — | — | 0.76 | 0.0000 | -0.450 | — |
| P21/c (No. 14) | monoclinic | 0.74 | 0.0000 | -0.453 | — |
| P21/c (No. 14) | monoclinic | 0.72 | 0.0000 | -0.453 | — |
| P21/c (No. 14) | monoclinic | 0.57 | 0.0000 | -9.655 | 3.50 |
| P21/c (No. 14) | monoclinic | 0.73 | 0.0003 | -0.453 | — |
| — | — | 0.76 | 0.0006 | -0.450 | — |
| P212121 (No. 19) | orthorhombic | 0.55 | 0.0041 | -9.651 | 3.39 |
| P212121 (No. 19) | orthorhombic | 0.58 | 0.0043 | -0.449 | — |
| P212121 (No. 19) | orthorhombic | 0.58 | 0.0043 | -0.449 | — |
| P212121 (No. 19) | orthorhombic | 0.57 | 0.0046 | -0.449 | — |
| — | — | 0.00 | 0.0475 | -0.403 | — |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.1406 | -0.313 | — |
Applications
Where NaAs is used.
Frequently Asked Questions
Common questions about NaAs, answered from cross-validated data.
What is NaAs?
NaAs is a stable semiconducting binary compound formed from sodium and arsenic.
What is NaAs used for?
What is the band gap of NaAs?
Is NaAs a metal, semiconductor, or insulator?
Is NaAs thermodynamically stable?
What is the crystal structure of NaAs?
How many polymorphs of NaAs are known?
What elements does NaAs contain?
Where does the data for NaAs come from?
How It Compares
As a thermodynamically stable phase, NaAs serves as a foundational reference point for understanding the bonding and electronic behavior of binary sodium-arsenic systems, providing a stable benchmark for investigating similar pnictide-based materials.
Data sources & attribution
- 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)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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