Rb2O
rubidium oxide
Rubidium oxide is a stable, semiconducting binary compound consisting of rubidium and oxygen atoms.
About rubidium oxide
Rubidium oxide is a binary inorganic compound composed of rubidium and oxygen. As a thermodynamically stable phase located on the convex hull, it represents a well-defined state within its chemical system, supported by extensive structural characterization across multiple databases.
Exhibiting semiconducting electronic characteristics, this material is of significant interest for fundamental studies in solid-state chemistry and alkali metal oxide physics. Its stable configuration makes it a primary subject for understanding the bonding and electronic behavior of heavy alkali metal oxides.
Key Properties
Cross-validated computational properties for rubidium oxide, 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 Rb2O. 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 Rb2O, 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 | 1.35 | 0.0000 | -1.177 | — |
| — | — | 0.78 | 0.0000 | -1.051 | — |
| R-3m (No. 166) | trigonal | 0.45 | 0.0000 | -3.436 | 3.23 |
| P3 (No. 143) | trigonal | 0.19 | 0.0026 | -3.434 | 2.98 |
| Fm-3m (No. 225) | cubic | 1.32 | 0.0032 | -3.433 | 4.02 |
| — | — | 1.64 | 0.0035 | -1.048 | — |
| — | — | 1.46 | 0.0058 | -1.045 | — |
| — | — | 0.60 | 0.0064 | -1.045 | — |
| — | — | 0.86 | 0.0104 | -1.041 | — |
| — | — | 0.71 | 0.0104 | -1.041 | — |
| — | — | 0.74 | 0.0118 | -1.039 | — |
| Pbca (No. 61) | orthorhombic | 0.94 | 0.0141 | -3.422 | 3.96 |
Applications
Where rubidium oxide is used.
Frequently Asked Questions
Common questions about rubidium oxide, answered from cross-validated data.
What is Rb2O?
Rubidium oxide is a stable, semiconducting binary compound consisting of rubidium and oxygen atoms.
What is Rb2O used for?
What is the band gap of Rb2O?
Is Rb2O a metal, semiconductor, or insulator?
Is Rb2O thermodynamically stable?
What is the crystal structure of Rb2O?
What is the density of Rb2O?
How many polymorphs of Rb2O are known?
What elements does Rb2O contain?
Where does the data for Rb2O come from?
How It Compares
As a primary binary oxide of rubidium, this compound serves as a fundamental reference point for understanding the structural and electronic trends within the alkali metal oxide family, providing a baseline for comparative studies of heavier group one oxides.
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)
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