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Caesium nitrate or cesium nitrate is a chemical compound with the chemical formula CsNO3. An alkali metal nitrate, it is used in pyrotechnic compositions, as a colorant and an oxidizer, e.g. in decoys and illumination flares. The caesium emissions are chiefly due to two powerful spectral lines at 852.113 nm and 894.347 nm.

Caesium nitrate[1]
Cesium nitrate.JPG
3D model (JSmol)
ECHA InfoCard 100.029.224
EC Number 232-146-8
RTECS number FL0700000
UN number 1451
Molar mass 194.91 g/mol
Appearance white solid
Density 3.685 g/cm3
Melting point 414 °C (777 °F; 687 K)
Boiling point decomposes, see text
9.16 g/100 ml (0 °C)
196.8 g/100 ml (100 °C)
Solubility in acetone soluble
Solubility in ethanol slightly soluble
GHS pictograms Ox. Sol. 3
GHS signal word WARNING
H272, H315, H319, H335
P210, P220, P221, P280, P370+378, P501
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
2390 mg/kg (oral, rat)[2]
Related compounds
Other anions
Caesium nitrite
Other cations
Lithium nitrate
Sodium nitrate
Potassium nitrate
Rubidium nitrate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Caesium nitrate prisms are used in infrared spectroscopy, in x-ray phosphors, and in scintillation counters.[3] It is also used in making optical glasses and lenses.

As with other alkali metal nitrates, caesium nitrate decomposes on gentle heating to give caesium nitrite:

2CsNO3 → 2CsNO2 + O2

Caesium also forms two unusual acid nitrates, which can be described as CsNO3·HNO3 and CsNO3·2HNO3 (melting points 100 °C and 36–38 °C respectively).[1]


  1. ^ a b Weast, Robert C., ed. (1981). CRC Handbook of Chemistry and Physics (62nd ed.). Boca Raton, FL: CRC Press. p. B-92. ISBN 0-8493-0462-8..
  2. ^
  3. ^ Budavari, Susan, ed. (2001), The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (13th ed.), Merck, p. 345, ISBN 0911910131.

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