RbI
Rubidium iodide · RbI
Rubidium iodide is a crystalline salt composed of rubidium and iodine. It is primarily utilized in specialized optical components and as a research chemical in various laboratory settings.
IRb
Overview
Key Properties
Cross-validated computational properties for Rubidium iodide, aggregated across 4 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.
3.35–3.78 eV
Range across DFT structures
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.
0.000 eV/atom
Best (lowest) across sources
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.
On hull (stable)
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
61
4 databases, 17 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for RbI, 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 | 3.78 | 0.0000 | -2.948 | 3.51 |
| Pm-3m (No. 221) | cubic | 3.35 | 0.0297 | -2.918 | 4.02 |
| C2/m (No. 12) | Monoclinic | — | — | — | 2.53 |
| P-1 (No. 2) | Triclinic | — | — | — | 3.49 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.58 |
| P-1 (No. 2) | Triclinic | — | — | — | 2.54 |
| P1 (No. 1) | Triclinic | — | — | — | 4.49 |
| P1 (No. 1) | Triclinic | — | — | — | 2.53 |
| P1 (No. 1) | Triclinic | — | — | — | 2.43 |
| Cmc21 (No. 36) | Orthorhombic | — | — | — | 4.42 |
| Cmc21 (No. 36) | Orthorhombic | — | — | — | 3.53 |
| Cmc21 (No. 36) | Orthorhombic | — | — | — | 3.22 |
Uses
Applications
Where Rubidium iodide is used.
Optical materialsScintillation detectorsChemical research
Reference
Frequently Asked Questions
Common questions about Rubidium iodide, answered from cross-validated data.
What is RbI?
Rubidium iodide is a crystalline salt composed of rubidium and iodine. It is primarily utilized in specialized optical components and as a research chemical in various laboratory settings.
More questions
What is RbI used for?
Rubidium iodide (RbI) is used in optical materials, scintillation detectors, and chemical research.
What is the band gap of RbI?
Rubidium iodide (RbI) has a DFT-computed band gap of 3.35–3.78 eV across 61 reported structures.
Is RbI a metal, semiconductor, or insulator?
With a wide band gap up to 3.78 eV it is an insulator / wide-band-gap material.
Is RbI thermodynamically stable?
Yes — Rubidium iodide (RbI) sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of RbI?
The lowest-energy reported polymorph of Rubidium iodide (RbI) is cubic symmetry, space group Fm-3m (No. 225).
What is the density of RbI?
The computed density of the ground-state structure of Rubidium iodide (RbI) is 3.51 g/cm³.
How many polymorphs of RbI are known?
61 structures of RbI are reported across 4 databases, spanning 17 distinct space groups.
What elements does RbI contain?
Rubidium iodide (RbI) contains I and Rb (2 elements).
Where does the data for RbI come from?
RbI data is cross-referenced from materials_project, mpaloe, jarvis.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
Analyze RbI in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 53 integrated data sources.
Explore the Platform →