RbSb2
RbSb2 is a stable, semiconducting binary compound formed from rubidium and antimony.
About RbSb2
RbSb2 is a binary intermetallic compound composed of rubidium and antimony. It exists as a thermodynamically stable phase, sitting directly on the convex hull, which indicates a robust structural configuration under standard conditions. As a semiconducting material, it offers unique electronic properties that distinguish it from simple metallic alloys. Its structural diversity is highlighted by multiple reported configurations across various databases, making it a subject of interest for fundamental materials research.
Key Properties
Cross-validated computational properties for RbSb2, aggregated across 4 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 RbSb2. 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 RbSb2, 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. |
|---|---|---|---|---|---|
| C2/m (No. 12) | monoclinic | 0.39 | 0.0000 | -0.346 | — |
| — | — | 0.34 | 0.0000 | -0.305 | — |
| C2/m (No. 12) | monoclinic | 0.27 | 0.0000 | -3.489 | 4.37 |
| — | — | 0.00 | 0.0371 | -0.268 | — |
| P-1 (No. 2) | triclinic | — | — | — | 3.96 |
| C2/m (No. 12) | monoclinic | — | — | — | 4.38 |
| P-1 (No. 2) | triclinic | — | — | — | 3.85 |
| C2/m (No. 12) | monoclinic | — | — | — | 4.29 |
| C2/m (No. 12) | monoclinic | — | — | — | 4.41 |
| P-1 (No. 2) | triclinic | — | — | — | 4.01 |
Applications
Where RbSb2 is used.
Frequently Asked Questions
Common questions about RbSb2, answered from cross-validated data.
What is RbSb2?
RbSb2 is a stable, semiconducting binary compound formed from rubidium and antimony.
What is RbSb2 used for?
What is the band gap of RbSb2?
Is RbSb2 a metal, semiconductor, or insulator?
Is RbSb2 thermodynamically stable?
What is the crystal structure of RbSb2?
How many polymorphs of RbSb2 are known?
What elements does RbSb2 contain?
Where does the data for RbSb2 come from?
How It Compares
As a standalone representative of its specific stoichiometry in the rubidium-antimony system, RbSb2 serves as a critical reference point for understanding the electronic and structural behavior of alkali-metal antimonides.
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)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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