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
ECHA InfoCard	100.029.195
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 labelling:^[3]
Pictograms
Hazard statements	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). Infobox references

Chemical compound

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

^ 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. Bibcode:1974AcCrB..30.2069K. doi:10.1107/S0567740874006431. ISSN 0567-7408.
^ Ge, W. W.; Zhang, H. J.; Wang, J. Y.; Liu, J. H.; Xu, X. G.; Hu, X. B.; Jiang, M. H.; Ran, D. G.; Sun, S. Q.; Xia, H. R.; Boughton, R. I. (2005). "Thermal and mechanical properties of BaWO4 crystal". Journal of Applied Physics. 98 (1): 013542. doi:10.1063/1.1957125. ISSN 0021-8979.
^ ^a ^b ^c "MSDS-343137". Sigma-Aldrich. Retrieved 2020-07-10.
^ ^a ^b Perry, Dale L. (2011). Handbook of Inorganic Compounds (2nd ed.). CRC Press. p. 59. ISBN 978-1-4398-1461-1.
^ Vidya, S.; Solomon, Sam; Thomas, J. K. (2013). "Synthesis, Characterization, and Low Temperature Sintering of Nanostructured BaWO₄ for Optical and LTCC Applications". Advances in Condensed Matter Physics. 2013: 1–11. doi:10.1155/2013/409620. ISSN 1687-8108.
^ 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". Journal of Nanostructure in Chemistry. 5 (1): 45–54. doi:10.1007/s40097-014-0133-y. ISSN 2008-9244.
^ Errandonea, D.; Pellicer-Porres, J.; Manjón, F. J.; Segura, A.; Ferrer-Roca, Ch.; Kumar, R. S.; Tschauner, O.; López-Solano, J.; Rodríguez-Hernández, P.; Radescu, S.; Mujica, A. (2006-06-05). "Determination of the high-pressure crystal structure of BaWO₄ and PbW_O4". Physical Review B. 73 (22): 224103. arXiv:cond-mat/0602632. Bibcode:2006PhRvB..73v4103E. doi:10.1103/PhysRevB.73.224103. ISSN 1098-0121. S2CID 55297808.
^ Colin E., Webb; Jones, Julian D. C. (2004). Handbook of Laser Technology and Applications: Laser Design and Laser Systems. CRC Press. p. 486. ISBN 978-0-7503-0963-9.