RbBr
Rubidium bromide · Rubidium monobromide
Rubidium bromide is a stable, insulating salt formed from rubidium and bromine that is widely utilized in fundamental materials research.
About Rubidium bromide
Rubidium bromide is a crystalline alkali halide composed of rubidium and bromine. As a thermodynamically stable compound, it maintains a robust structural integrity that makes it a reliable subject for fundamental solid-state research.
Characterized by its wide-gap insulating electronic profile, this material serves as a classic example of ionic bonding in inorganic chemistry. Its extensive documentation across multiple structural databases highlights its significance in understanding halide lattice dynamics.
Key Properties
Cross-validated computational properties for Rubidium bromide, 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 RbBr. 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 RbBr, 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. |
|---|---|---|---|---|---|
| Fm-3m (No. 225) | cubic | 4.44 | 0.0000 | -1.866 | — |
| Fm-3m (No. 225) | cubic | 4.19 | 0.0000 | -3.337 | 3.33 |
| — | — | 4.44 | 0.0006 | -1.928 | — |
| — | — | 4.42 | 0.0010 | -1.927 | — |
| — | — | 4.32 | 0.0011 | -1.927 | — |
| — | — | 4.40 | 0.0021 | -1.926 | — |
| Pm-3m (No. 221) | cubic | 4.41 | 0.0022 | -1.864 | — |
| P-6m2 (No. 187) | hexagonal | 3.94 | 0.0188 | -1.847 | — |
| Pm-3m (No. 221) | cubic | 3.92 | 0.0316 | -3.306 | 3.91 |
| — | — | 4.25 | 0.0449 | -1.883 | — |
| — | — | 4.35 | 0.0466 | -1.882 | — |
| — | — | 4.15 | 0.0553 | -1.873 | — |
Applications
Where Rubidium bromide is used.
Frequently Asked Questions
Common questions about Rubidium bromide, answered from cross-validated data.
What is RbBr?
Rubidium bromide is a stable, insulating salt formed from rubidium and bromine that is widely utilized in fundamental materials research.
What is RbBr used for?
What is the band gap of RbBr?
Is RbBr a metal, semiconductor, or insulator?
Is RbBr thermodynamically stable?
What is the crystal structure of RbBr?
How many polymorphs of RbBr are known?
What elements does RbBr contain?
Where does the data for RbBr come from?
How It Compares
As a prominent member of the alkali halide family, rubidium bromide exemplifies the predictable structural trends and insulating behavior typical of this class of ionic solids.
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)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- 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)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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