Rb4Br2O
Rb4Br2O is a semiconducting, near-hull rubidium compound that serves as a specialized subject for solid-state materials research.
About Rb4Br2O
Rb4Br2O is a complex rubidium-based compound characterized by its semiconducting electronic nature. Its structural configuration suggests a unique arrangement of bromine and oxygen anions within the rubidium lattice, marking it as a subject of interest for fundamental solid-state chemistry studies.
As a near-hull material, this compound is considered a promising candidate for experimental synthesis. Its existence across multiple structural databases highlights its significance as a stable, albeit specialized, inorganic phase within the broader landscape of alkali metal halides and oxides.
Key Properties
Cross-validated computational properties for Rb4Br2O, 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 Rb4Br2O. 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 Rb4Br2O, 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. |
|---|---|---|---|---|---|
| — | — | 0.73 | 0.0088 | -1.569 | — |
| I4/mmm (No. 139) | tetragonal | 0.50 | 0.0197 | -1.564 | — |
| I4/mmm (No. 139) | tetragonal | 0.58 | 0.1372 | -3.242 | 3.36 |
| I4/mmm (No. 139) | tetragonal | — | — | — | 3.36 |
| I4/mmm (No. 139) | tetragonal | — | — | — | 3.20 |
| I4/mmm (No. 139) | tetragonal | — | — | — | 3.36 |
| I4/mmm (No. 139) | tetragonal | — | — | — | 3.28 |
Applications
Where Rb4Br2O is used.
Frequently Asked Questions
Common questions about Rb4Br2O, answered from cross-validated data.
What is Rb4Br2O?
Rb4Br2O is a semiconducting, near-hull rubidium compound that serves as a specialized subject for solid-state materials research.
What is Rb4Br2O used for?
What is the band gap of Rb4Br2O?
Is Rb4Br2O a metal, semiconductor, or insulator?
Is Rb4Br2O thermodynamically stable?
What is the crystal structure of Rb4Br2O?
How many polymorphs of Rb4Br2O are known?
What elements does Rb4Br2O contain?
Where does the data for Rb4Br2O come from?
How It Compares
As a unique member of the rubidium-bromine-oxygen system, Rb4Br2O occupies a distinct structural niche. Unlike simpler binary alkali halides, this compound incorporates oxygen into its lattice, providing a more complex electronic environment that distinguishes it from standard ionic insulators.
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)
- 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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