RbF
rubidium fluoride · rubidium(I) fluoride
Rubidium fluoride is a stable, insulating salt composed of rubidium and fluorine that is widely studied for its fundamental ionic properties.
About rubidium fluoride
Rubidium fluoride is a simple inorganic salt composed of rubidium and fluorine. As a wide-gap insulator, it exhibits high electronic stability and exists as a thermodynamically stable phase on the convex hull, making it a reliable subject for fundamental materials research. The compound is characterized by its high structural consistency, supported by extensive data across multiple material databases. Its chemical behavior is typical of alkali halides, where the ionic bonding dictates its crystal structure and physical properties. It serves as a foundational material in solid-state chemistry for studying ionic lattice dynamics and halide interactions.
Key Properties
Cross-validated computational properties for rubidium fluoride, 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 RbF. 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 RbF, 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. |
|---|---|---|---|---|---|
| — | — | 6.15 | 0.0000 | -2.857 | — |
| Fm-3m (No. 225) | cubic | 5.96 | 0.0000 | -2.869 | — |
| Fm-3m (No. 225) | cubic | 5.53 | 0.0000 | -4.321 | 3.88 |
| — | — | 6.16 | 0.0056 | -2.852 | — |
| — | — | 6.17 | 0.0144 | -2.843 | — |
| P-6m2 (No. 187) | hexagonal | 5.43 | 0.0192 | -2.850 | — |
| — | — | 6.22 | 0.0263 | -2.831 | — |
| — | — | 6.18 | 0.0341 | -2.823 | — |
| — | — | 6.18 | 0.0382 | -2.819 | — |
| — | — | 5.92 | 0.0418 | -2.816 | — |
| Pm-3m (No. 221) | cubic | 5.91 | 0.0516 | -4.269 | 4.53 |
| Pm-3m (No. 221) | cubic | 6.72 | 0.0519 | -2.817 | — |
Applications
Where rubidium fluoride is used.
Frequently Asked Questions
Common questions about rubidium fluoride, answered from cross-validated data.
What is RbF?
Rubidium fluoride is a stable, insulating salt composed of rubidium and fluorine that is widely studied for its fundamental ionic properties.
What is RbF used for?
What is the band gap of RbF?
Is RbF a metal, semiconductor, or insulator?
Is RbF thermodynamically stable?
What is the crystal structure of RbF?
How many polymorphs of RbF are known?
What elements does RbF contain?
Where does the data for RbF come from?
How It Compares
As a member of the alkali halide family, rubidium fluoride represents a stable, well-defined ionic compound. It serves as a benchmark for understanding the structural trends and bonding characteristics inherent to the group, providing a clear reference point for the study of larger alkali metal halides.
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.
Analyze RbF in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 85 source databases.
Explore the Platform →