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Caesium bromide

Caesium(I) bromide 420 g/L (11 °C) See References 560 /L (15°C) 1020 g/L (28.5 °C) 1180 g/L (31 °C) 1240 g/L (32.5 °C) 1380 g/L (35 °C) 1.6974 (0.59 μm) 1.6861 (0.75 μm) 1.6784 (1 μm) 1.6678 (5 μm) 1.6439 (20 μm) Cubic (Br−) | NFPA-H = 2 | NFPA-F = 0 | NFPA-R = 0 Caesium chloride Caesium iodide Caesium astatide Potassium bromide Rubidium bromide Francium bromide

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.

References

Cited sources

References

  1. Haynes, p. 4.57
  2. Haynes, p. 10.240
  3. Haynes, p. 4.132
  4. (1964). "Elastic Constants of CsBr and CsI from 4.2K to Room Temperature". Journal of Applied Physics.
  5. [https://pubchem.ncbi.nlm.nih.gov/#tab/sidsrcname=ChemIDplus&query=7787-69-1&input_type=text Caesium bromide]. nlm.nih.gov
  6. (1951). "Polymorphism of cesium and thallium halides". Acta Crystallographica.
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caesium-compounds alkali-metal-bromides caesium-chloride-crystal-structure
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