Caesium bromide

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Caesium bromide
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Template:Longitem CsBr
Molar mass 212.809 g/mol[1]
Appearance White solid
Density 4.43 g/cm3[1]
Melting point Template:Chembox CalcTemperatures
Boiling point Template:Chembox CalcTemperatures
Template:Longitem −67.2·10−6 cm3/mol[2]
Template:Longitem 1.8047 (0.3 μm)
1.6974 (0.59 μm)
1.6861 (0.75 μm)
1.6784 (1 μm)
1.6678 (5 μm)
1.6439 (20 μm)[3]
Template:Longitem CsCl, cP2
Template:Longitem Pm3m, No. 221[4]
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a = 0.4291 nm
Template:Longitem Cubic (Cs+)
Cubic (Br−)
NFPA 704 (fire diamond) Template:NFPA 704 diamond
Flash point Template:Chembox CalcTemperatures
Template:Longitem Caesium fluoride
Caesium chloride
Caesium iodide
Caesium astatide
Template:Longitem Sodium bromide
Potassium bromide
Rubidium bromide
Francium bromide

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Caesium bromide or cesium bromide is an ionic compound of caesium and bromine with the chemical formula CsBr. It is a white or transparent solid with melting point at 636 °C that readily dissolves in water. Its bulk crystals have the cubic CsCl structure, but the structure changes to the rocksalt type in nanometer-thin film grown on mica, LiF, KBr or NaCl substrates.[6]

Synthesis

Caesium bromide can be prepared via following reactions:

CsOH (aq) + HBr (aq) → CsBr (aq) + H2O (l)
Cs2(CO3) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H2O (l) + CO2 (g)
  • Direct synthesis:
2 Cs (s) + Br2 (g) → 2 CsBr (s)

The direct synthesis is a vigorous reaction of caesium with bromine. Due to its high cost, it is not used for preparation.

Uses

Caesium bromide is sometimes used in optics as a beamsplitter component in wide-band spectrophotometers.

References

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  1. ↑ a b c Haynes, p. 4.57
  2. ↑ Haynes, p. 4.132
  3. ↑ Haynes, p. 10.240
  4. ↑ Script error: No such module "Citation/CS1".
  5. ↑ Caesium bromide. nlm.nih.gov
  6. ↑ Script error: No such module "Citation/CS1".

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* Crystran Ltd experimental data July 2021 Script error: No such module "webarchive".

Cited sources

External links

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