RbF2
Rubidium difluoride is a rare and unstable inorganic compound containing rubidium in an unusual oxidation state. Due to its high reactivity and tendency to decompose into more stable rubidium fluorides, it is primarily of interest in fundamental chemical research rather than practical industrial applications.
Key Properties
Cross-validated computational properties for RbF2, 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.
Reported Structures
Lowest-energy structures reported for RbF2, 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. |
|---|---|---|---|---|---|
| P42/mnm (No. 136) | tetragonal | 1.43 | 0.0516 | -3.718 | 2.94 |
| P-1 (No. 2) | Triclinic | — | — | — | 3.26 |
| Cm (No. 8) | Monoclinic | — | — | — | 1.61 |
| Cm (No. 8) | Monoclinic | — | — | — | 1.50 |
| Amm2 (No. 38) | Orthorhombic | — | — | — | 1.47 |
| P2/c (No. 13) | Monoclinic | — | — | — | 2.63 |
| P2/c (No. 13) | Monoclinic | — | — | — | 2.87 |
| Pmmn (No. 59) | Orthorhombic | — | — | — | 3.88 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.86 |
| Amm2 (No. 38) | Orthorhombic | — | — | — | 1.61 |
| Amm2 (No. 38) | Orthorhombic | — | — | — | 2.22 |
| C2/m (No. 12) | Monoclinic | — | — | — | 2.10 |
Applications
Where RbF2 is used.
Frequently Asked Questions
Common questions about RbF2, answered from cross-validated data.
What is RbF2?
Rubidium difluoride is a rare and unstable inorganic compound containing rubidium in an unusual oxidation state. Due to its high reactivity and tendency to decompose into more stable rubidium fluorides, it is primarily of interest in fundamental chemical research rather than practical industrial applications.
What is RbF2 used for?
What is the band gap of RbF2?
Is RbF2 a metal, semiconductor, or insulator?
Is RbF2 thermodynamically stable?
What is the crystal structure of RbF2?
What is the density of RbF2?
How many polymorphs of RbF2 are known?
What elements does RbF2 contain?
Where does the data for RbF2 come from?
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
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