Barium tungstate

Barium tungstate  Names

Other names

* Barium wolframate
* Tungstate white
* Wolfram white

Identifiers

CAS Number

* 7787-42-0

3D model (JSmol)

* Interactive image

ChemSpider |

* 145169

EC Number |

* 232-114-3

PubChem CID

* 4280986

InChI

* InChI=1S/Ba.4O.W/q+2;;;2*-1;

Key: SJPVUFMOBDBTHQ-UHFFFAOYSA-N

SMILES

* [O-][W](=O)(=O)[O-].[Ba+2]

Properties[3]

Chemical formula

| 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]

Solubility in water

| insoluble
Structure[4]

Crystal structure

| tetragonal

Lattice constant

a = 561.4 pm, c = 1271.5 pm

Hazards
GHS pictograms |

GHS hazard statements

| H302, H332

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

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. ↑ Kawada, I.; Kato, K.; Fujita, T. (1974-08-01). "BaWO 4 -II (a high-pressure form)". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry 30 (8): 2069–2071. doi:10.1107/S0567740874006431. ISSN 0567-7408. http://scripts.iucr.org/cgi-bin/paper?S0567740874006431.
2. ↑ Ge, W. W.; Zhang, H. J.; Wang, J. Y.; Liu, J. H.; Xu, X. G.; Hu, X. B.; Jiang, M. H.; Ran, D. G. et al. (2005). "Thermal and mechanical properties of BaWO4 crystal" (in en). Journal of Applied Physics 98 (1): 013542. doi:10.1063/1.1957125. ISSN 0021-8979. http://aip.scitation.org/doi/10.1063/1.1957125.
3. ↑ 3.0 3.1 3.2 "MSDS-343137". Sigma-Aldrich. https://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?productNumber=343137&brand=ALDRICH.
4. ↑ 4.0 4.1 Perry, Dale L. (2011). Handbook of Inorganic Compounds (2nd ed.). CRC Press. pp. 59. ISBN 978-1-4398-1461-1.
5. ↑ Vidya, S.; Solomon, Sam; Thomas, J. K. (2013). "Synthesis, Characterization, and Low Temperature Sintering of Nanostructured BaWO4 for Optical and LTCC Applications" (in en). Advances in Condensed Matter Physics 2013: 1–11. doi:10.1155/2013/409620. ISSN 1687-8108. http://www.hindawi.com/journals/acmp/2013/409620/.
6. ↑ Mohamed Jaffer Sadiq, M.; Samson Nesaraj, A. (2015). "Soft chemical synthesis and characterization of BaWO4 nanoparticles for photocatalytic removal of Rhodamine B present in water sample" (in en). Journal of Nanostructure in Chemistry 5 (1): 45–54. doi:10.1007/s40097-014-0133-y. ISSN 2008-9244. http://link.springer.com/10.1007/s40097-014-0133-y.
7. ↑ Errandonea, D.; Pellicer-Porres, J.; Manjón, F. J.; Segura, A.; Ferrer-Roca, Ch.; Kumar, R. S.; Tschauner, O.; López-Solano, J. et al. (2006-06-05). "Determination of the high-pressure crystal structure of BaWO4 and PbWO4" (in en). Physical Review B 73 (22): 224103. doi:10.1103/PhysRevB.73.224103. ISSN 1098-0121. https://link.aps.org/doi/10.1103/PhysRevB.73.224103.
8. ↑ Colin E., Webb; Jones, Julian D. C. (2004). Handbook of Laser Technology and Applications: Laser Design and Laser Systems.. CRC Press. pp. 486. ISBN 978-0-7503-0963-9. https://books.google.com/books?id=DEgn44m6OREC&pg=PA486.

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*[CID]: Compound ID
*[H302]: Harmful if swallowed
*[H332]: Harmful if inhaled