Barium tungstate

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Barium tungstate
Names
Other names
  • Barium wolframate
  • Tungstate white
  • Wolfram white
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.029.195 Edit this at Wikidata
EC Number
  • 232-114-3
  • InChI=1S/Ba.4O.W/q+2;;;2*-1;
    Key: SJPVUFMOBDBTHQ-UHFFFAOYSA-N
  • [O-][W](=O)(=O)[O-].[Ba+2]
Properties[3]
BaWO4
Molar mass 385.16 g·mol−1
Appearance white solid
Density 5.04 g·cm−3 (25 °C)
7.26 g·cm−3 (high pressure form)[1]
Melting point 1502 °C[2]
insoluble
Structure[4]
tetragonal
a = 561.4 pm, c = 1271.5 pm
Hazards
GHS labelling:[3]
GHS07: Exclamation mark
H302, H332
Related compounds
Related compounds
 Radium tungstate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Barium tungstate is an inorganic chemical compound of barium and the tungstate anion.

Synthesis and properties

Barium tungstate can be obtained from the precipitation reaction between barium nitrate and ammonium paratungstate or sodium tungstate.[5][6]

Ba(NO3)2 + Na2WO4 → BaWO4↓ + 2 NaNO3

It is a white solid,[3] which at normal conditions forms tetragonal crystals similar to scheelite, CaWO4. Under pressures above 7 GPa, the compound undergoes transformation to a monoclinic structure similar to fergusonite, YNbO4.[7]

Uses

Barium tungstate can be used as a frequency shifter in laser technology.[8] It has uses in X-ray photography and as a pigment.[4]

References

  1. ISSN 0567-7408
    .
  2. ISSN 0021-8979
    .
  3. ^ a b c "MSDS-343137". Sigma-Aldrich. Retrieved 2020-07-10.
  4. ^
    ISBN 978-1-4398-1461-1
    .
  5. ISSN 1687-8108
    .
  6. ISSN 2008-9244
    .
  7. S2CID 55297808
    .
  8. ISBN 978-0-7503-0963-9
    .
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