CsBr
Cesium bromide · Caesium bromide
Cesium bromide is a stable, insulating salt widely utilized for its excellent optical transparency in specialized scientific and industrial instrumentation.
About Cesium bromide
Cesium bromide is a robust, thermodynamically stable inorganic salt characterized by its wide-band-gap insulating electronic structure. Its ability to maintain structural integrity under various conditions makes it a reliable material for high-precision optical applications.
Because of its transparency across a broad range of the electromagnetic spectrum, this compound is highly valued in the manufacturing of optical windows and prisms. Its insulating nature also allows it to function effectively in specialized sensing technologies where electronic stability is paramount.
Key Properties
Cross-validated computational properties for Cesium bromide, aggregated across 2 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 CsBr. 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 CsBr, 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. |
|---|---|---|---|---|---|
| Pm-3m (No. 221) | cubic | 4.24 | 0.0000 | -3.324 | 4.37 |
| — | — | 4.49 | 0.0008 | -1.963 | — |
| — | — | 4.52 | 0.0010 | -1.963 | — |
| — | — | 4.47 | 0.0013 | -1.963 | — |
| — | — | 4.51 | 0.0015 | -1.963 | — |
| Fm-3m (No. 225) | cubic | 4.26 | 0.0051 | -3.319 | 3.60 |
| — | — | 4.49 | 0.0399 | -1.924 | — |
| — | — | 4.51 | 0.0411 | -1.923 | — |
| — | — | 0.00 | 0.0452 | -1.919 | — |
| — | — | 4.07 | 0.0830 | -1.881 | — |
| — | — | 4.12 | 0.0878 | -1.877 | — |
| — | — | 3.92 | 0.3240 | -1.640 | — |
Applications
Where Cesium bromide is used.
Frequently Asked Questions
Common questions about Cesium bromide, answered from cross-validated data.
What is CsBr?
Cesium bromide is a stable, insulating salt widely utilized for its excellent optical transparency in specialized scientific and industrial instrumentation.
What is CsBr used for?
What is the band gap of CsBr?
Is CsBr a metal, semiconductor, or insulator?
Is CsBr thermodynamically stable?
What is the crystal structure of CsBr?
What is the density of CsBr?
How many polymorphs of CsBr are known?
What elements does CsBr contain?
Where does the data for CsBr come from?
How It Compares
As a stable halide compound, cesium bromide serves as a fundamental example of an insulating salt within its chemical class, providing a benchmark for optical clarity and structural durability in inorganic materials.
Data sources & attribution
- 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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