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Caesium tungstate

Chemical compound From Wikipedia, the free encyclopedia

Caesium tungstate or cesium tungstate is an inorganic chemical compound with the formula Cs2WO4.[2] It is notable for forming a very dense liquid in solution (a solution containing 85.6g Cs2WO4 per 100g water has a specific gravity of 3.0133).[3] The solution is used in diamond processing, since diamond sinks in it, whereas most other rocks float.[4]

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Caesium tungstate
Names
Other names
  • Cesium tungstate
  • Cesium tungsten oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.639 Edit this at Wikidata
EC Number
  • 237-019-0
  • InChI=1S/2Cs.4O.W/q2*+1;;;2*-1;
    Key: VPXSRGLTQINCRV-UHFFFAOYSA-N
  • [O-][W](=O)(=O)[O-].[Cs+].[Cs+]
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).
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Properties

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

Preparation

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.

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