Caesium tungstate

Last updated
Caesium tungstate
Names
Other names
  • Cesium tungstate
  • Cesium tungsten oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.639 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 237-019-0
PubChem CID
  • 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).

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]

Contents

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.

References

  1. Cesium tungstate
  2. Perry, Dale L. (2011). Handbook of inorganic compounds (2nd ed.). Boca Raton: CRC Press. ISBN   978-1-4398-1461-1.
  3. WO2000036165A2,Young, Tom L.; Bauer, Kathy& Greene, Michael G.et al.,"Heavy caesium salt containing liquids for use in separation processes",issued 2000-06-22
  4. US20230114534A1,Cardarelli, Francois,"High Temperature Chemical Process For The Preparation Of Cesium Tungstate",issued 2023-04-13