Caesium tungstate

Caesium tungstate
Names
Other names
Cesium tungstate, Cesium tungsten oxide
Identifiers
ECHA InfoCard 100.033.639 Edit this at Wikidata
Properties
Cs2WO4
Molar mass 513.65 g/mol
Melting point >350 °C[1]
Related compounds
Other cations
Lithium tungstate
Sodium tungstate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Caesium tungstate or cesium tungstate is an inorganic chemical compound that is notable for forming a very dense liquid in solution. The solution is used in diamond processing, since diamond sinks in it, whereas most other rocks float.

Properties

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Caesium tungstate forms colorless crystals, which are strongly hygroscopic. A phase transition from orthorhombic to hexagonal crystal system occurs at 536 °C.

Preparation

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Caesium tungstate can be obtained by the reaction between caesium chloride (CsCl) and silver tungstate (Ag2WO4) or the reaction between tungstic acid and caesium hydroxide.

References

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