Caesium 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.
Synthesis
Caesium bromide can be prepared via neutralization reactions:
CsOH + HBr → CsBr + H2O
Cs2(CO3) + 2 HBr → 2 CsBr + H2O + CO2
It can also be prepared by direct synthesis:
2 Cs + Br2 → 2 CsBr
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.[citation needed]
Cited sources
- Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. ISBN 1-4398-5511-0.
- 2012-12-18 at the Wayback Machine
External links
- 2007-10-17 at the Wayback Machine
- 2012-12-18 at the Wayback Machine,