Barium tungstate

Structural formula
General
Surname	Barium tungstate
other names	Barium white; Tungsten white; Barium tungsten oxide;
Molecular formula	BaWO 4
Brief description	white solid
External identifiers / databases
EC number	232-114-3
ECHA InfoCard	100.029.195
PubChem	4280986
Wikidata	Q20979871
properties
Molar mass	385.16 g mol −1
Physical state	firmly
density	5.04 g cm −3 (25 ° C); 7.26 g cm −3 (letterpress type);
Melting point	1502 ° C
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 302-332
	P: no P-phrases
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Barium tungstate is an inorganic chemical compound of barium from the group of tungstates .

Extraction and presentation

Barium tungstate can be obtained by reacting salt solutions of tungsten and barium such as barium nitrate with ammonium paratungstate or sodium tungstate .

{\ displaystyle \ mathrm {Ba (NO_ {3}) _ {2} + Na_ {2} WO_ {4} \ \ longrightarrow {} \ BaWO_ {4} \ downarrow +2 \ NaNO_ {3}}}

It can also be obtained by reacting barium oxide with tungsten trioxide , although with Ba ₃ WO ₆ mainly another barium tungstate is formed.

{\ displaystyle \ mathrm {BaO + WO_ {3} \ \ longrightarrow {} \ BaWO_ {4}}}

properties

Barium tungstate is a white solid. Under normal conditions it has a tetragonal crystal structure of the Scheelite type with the space group I 4 ₁ / a (space group no. 88) . At pressures above 7 GPa, the compound changes into a monoclinic fergusonite structure with the space group P 2 ₁ / n (space group no. 14, position 2) . Template: room group / 88 Template: room group / 14.2

use

Barium tungstate can be used as a frequency shift material for laser applications .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f data sheet barium wolframate, −100 mesh, 99.9% trace metals basis from Sigma-Aldrich , accessed on June 10, 2016 ( PDF ).
^ I. Kawada, K. Kato, T. Fujita: BaWO4-II (a high-pressure form). In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 30, p. 2069, doi : 10.1107 / S0567740874006431 .
^ WW Ge, HJ Zhang, JY Wang, JH Liu, XG Xu, XB Hu, MH Jiang, DG Ran, SQ Sun, HR Xia, RI Boughton: Thermal and mechanical properties of BaWO [4] crystal. In: Journal of Applied Physics. 98, 2005, p. 013542, doi : 10.1063 / 1.1957125 .
^ S. Vidya, Sam Solomon, JK Thomas: Synthesis, Characterization, and Low Temperature Sintering of Nanostructured BaWO4 for Optical and LTCC Applications. In: Advances in Condensed Matter Physics. 2013, 2013, p. 1, doi : 10.1155 / 2013/409620 .
↑ M. Mohamed Jaffer Sadiq, A. Samson Nesaraj: Soft chemical synthesis and characterization of BaWO4 nanoparticles for photocatalytic removal of Rhodamine B present in water sample. In: Journal of Nanostructure in Chemistry. 5, 2015, p. 45, doi : 10.1007 / s40097-014-0133-y .
^ W Tungsten Supplement Volume A 7 Metal, Chemical Reactions with Inorganic and Organic Compounds . Springer Science & Business Media, 2013, ISBN 978-3-662-08687-2 , pp. 244 ( limited preview in Google Book search).
↑ D. Errandonea, J. Pellicer-Porres, FJ Manjón, A. Segura, Ch. Ferrer-Roca, RS Kumar, O. Tschauner, J. López-Solano, P. Rodríguez-Hernández, S. Radescu, A. Mujica , A. Muñoz, G. Aquilanti: Determination of the high-pressure crystal structure of BaWO ₄ and PbWO ₄ . In: Physical Review B. 73, 2006, doi : 10.1103 / PhysRevB.73.224103 .
^ Colin E. Webb, Julian DC Jones: Handbook of Laser Technology and Applications: Laser design and laser systems . CRC Press, 2004, ISBN 978-0-7503-0963-9 , pp. 486 ( limited preview in Google Book search).

[Sigma-1] ↑ ^a ^b ^c ^d ^e ^f data sheet barium wolframate, −100 mesh, 99.9% trace metals basis from Sigma-Aldrich , accessed on June 10, 2016 ( PDF ).

[DOI10.1107/S0567740874006431-2] I. Kawada, K. Kato, T. Fujita: BaWO4-II (a high-pressure form). In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 30, p. 2069, doi : 10.1107 / S0567740874006431 .

[DOI10.1063/1.1957125-3] WW Ge, HJ Zhang, JY Wang, JH Liu, XG Xu, XB Hu, MH Jiang, DG Ran, SQ Sun, HR Xia, RI Boughton: Thermal and mechanical properties of BaWO [4] crystal. In: Journal of Applied Physics. 98, 2005, p. 013542, doi : 10.1063 / 1.1957125 .

[DOI10.1155/2013/409620-4] S. Vidya, Sam Solomon, JK Thomas: Synthesis, Characterization, and Low Temperature Sintering of Nanostructured BaWO4 for Optical and LTCC Applications. In: Advances in Condensed Matter Physics. 2013, 2013, p. 1, doi : 10.1155 / 2013/409620 .

[DOI10.1007/s40097-014-0133-y-5] M. Mohamed Jaffer Sadiq, A. Samson Nesaraj: Soft chemical synthesis and characterization of BaWO4 nanoparticles for photocatalytic removal of Rhodamine B present in water sample. In: Journal of Nanostructure in Chemistry. 5, 2015, p. 45, doi : 10.1007 / s40097-014-0133-y .

[6] W Tungsten Supplement Volume A 7 Metal, Chemical Reactions with Inorganic and Organic Compounds . Springer Science & Business Media, 2013, ISBN 978-3-662-08687-2 , pp. 244 ( limited preview in Google Book search).

[DOI10.1103/PhysRevB.73.224103-7] D. Errandonea, J. Pellicer-Porres, FJ Manjón, A. Segura, Ch. Ferrer-Roca, RS Kumar, O. Tschauner, J. López-Solano, P. Rodríguez-Hernández, S. Radescu, A. Mujica , A. Muñoz, G. Aquilanti: Determination of the high-pressure crystal structure of BaWO ₄ and PbWO ₄ . In: Physical Review B. 73, 2006, doi : 10.1103 / PhysRevB.73.224103 .

[Colin_E._Webb,_Julian_D._C._Jones-8] Colin E. Webb, Julian DC Jones: Handbook of Laser Technology and Applications: Laser design and laser systems . CRC Press, 2004, ISBN 978-0-7503-0963-9 , pp. 486 ( limited preview in Google Book search).