Chemistry:Barium tungstate
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3D model (JSmol)
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| 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
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| H302, H332 | |
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Related compounds
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Radium 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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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. doi:10.1107/S0567740874006431. ISSN 0567-7408. http://scripts.iucr.org/cgi-bin/paper?S0567740874006431.
- ↑ 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.
- ↑ 3.0 3.1 3.2 "MSDS-343137". Sigma-Aldrich. https://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?productNumber=343137&brand=ALDRICH.
- ↑ 4.0 4.1 Perry, Dale L. (2011). Handbook of Inorganic Compounds (2nd ed.). CRC Press. pp. 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" (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/.
- ↑ 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.
- ↑ 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.
- ↑ 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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