Rb2As3
Rb2As3 is a stable, semiconducting binary compound formed from rubidium and arsenic.
About Rb2As3
Rb2As3 is a thermodynamically stable inorganic compound composed of rubidium and arsenic. As a member of the alkali metal arsenide family, it exhibits semiconducting electronic properties that make it a subject of interest for fundamental materials science research.
Its position on the convex hull indicates high thermodynamic stability, which is supported by its appearance across multiple structural databases. This stability makes it a reliable candidate for investigating the complex bonding environments found in binary pnictide systems.
Key Properties
Cross-validated computational properties for Rb2As3, 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 Rb2As3. 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 Rb2As3, 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. |
|---|---|---|---|---|---|
| — | — | 0.58 | 0.0000 | -0.423 | — |
| Fmmm (No. 69) | orthorhombic | 0.47 | 0.0000 | -0.471 | — |
| Fmmm (No. 69) | orthorhombic | 0.40 | 0.0000 | -3.601 | 3.68 |
| C2/m (No. 12) | monoclinic | — | — | — | 2.87 |
| C2/m (No. 12) | monoclinic | — | — | — | 3.86 |
| C2/m (No. 12) | monoclinic | — | — | — | 2.64 |
| Fmmm (No. 69) | orthorhombic | — | — | — | 3.65 |
| Fmmm (No. 69) | orthorhombic | — | — | — | 3.61 |
| P-4m2 (No. 115) | tetragonal | — | — | — | 3.79 |
| Pmm2 (No. 25) | orthorhombic | — | — | — | 3.58 |
| Fmmm (No. 69) | orthorhombic | — | — | — | 3.52 |
| P-4m2 (No. 115) | tetragonal | — | — | — | 4.72 |
Applications
Where Rb2As3 is used.
Frequently Asked Questions
Common questions about Rb2As3, answered from cross-validated data.
What is Rb2As3?
Rb2As3 is a stable, semiconducting binary compound formed from rubidium and arsenic.
What is Rb2As3 used for?
What is the band gap of Rb2As3?
Is Rb2As3 a metal, semiconductor, or insulator?
Is Rb2As3 thermodynamically stable?
What is the crystal structure of Rb2As3?
How many polymorphs of Rb2As3 are known?
What elements does Rb2As3 contain?
Where does the data for Rb2As3 come from?
How It Compares
As a stable binary arsenide, Rb2As3 serves as a foundational example of the structural diversity inherent in alkali-metal pnictides. It represents a well-defined point in the phase space of rubidium-arsenic materials, providing a benchmark for understanding the electronic behavior of similar semiconducting compounds.
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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