Magnesium tungstate

Structural formula
General
Surname	Magnesium tungstate
other names	Magnesium tungsten oxide
Molecular formula	MgWO 4
Brief description	white solid
External identifiers / databases
EC number	236-999-7
ECHA InfoCard	100.033.621
PubChem	5222468
Wikidata	Q18211703
properties
Molar mass	272.14 g mol −1
Physical state	firmly
Melting point	1358 ° C
solubility	practically insoluble in water
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Magnesium tungstate is an inorganic chemical compound of magnesium from the group of tungstates .

Occurrence

Magnesium tungstate occurs naturally in the form of the reddish brown mineral huanzalaite .

Extraction and presentation

Magnesium tungstate can be obtained by reacting magnesium oxide with tungsten trioxide and a magnesium salt, e.g. B .: Magnesium nitrate and sodium tungstate can be obtained.

{\ displaystyle \ mathrm {MgO + WO_ {3} \ \ longrightarrow {} \ MgWO_ {4}}}

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

properties

Magnesium tungstate is a white solid that is practically insoluble in water. It has a monoclinic crystal structure with the space group P 2 / c (space group no. 13) . There is still a high temperature form above 1065 ° C. The dihydrate has a crystal structure with the space group P 2 ₁ / c (no. 14) and is converted into the anhydrate at 650 ° C. Template: room group / 13Template: room group / 14

use

Magnesium tungstate is used as a phosphor .

Individual evidence

↑ ^a ^b ^c data sheet magnesium tungstate from AlfaAesar, accessed on June 11, 2016 ( PDF )(JavaScript required) .
↑ ^a ^b ^c data sheet magnesium wolframate, −325 mesh, 99.9% trace metals basis from Sigma-Aldrich , accessed on June 11, 2016 ( PDF ).
↑ Allen Alper: High Temperature Oxides . Elsevier, 2012, ISBN 978-0-323-15834-3 , pp. 116 ( limited preview in Google Book search).
↑ mineralienatlas.de: Mineralienatlas Lexikon - Huanzalait , accessed on June 11, 2016
↑ J. Ruiz-Fuertes, D. Errandonea, S. López-Moreno, J. González, O. Gomis, R. Vilaplana, FJ Manjón, A. Muñoz, P. Rodríguez-Hernández, A. Friedrich, IA Tupitsyna, LL Nagornaya: High-pressure Raman spectroscopy and lattice-dynamics calculations on scintillating MgWO ₄ : Comparison with isomorphic compounds. In: Physical Review B. 83, 2011, doi : 10.1103 / PhysRevB.83.214112 .
^ Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 845 ( limited preview in Google Book search).
↑ John R. Günter, Erich Dubler: Crystal structure and topotactic dehydration of magnesium tungstate dihydrate, MgWO4 - 2H2O. In: Journal of Solid State Chemistry. 65, 1986, p. 118, doi : 10.1016 / 0022-4596 (86) 90096-4 .
↑ M. Amberg, JR Günter, H. Schmalle, G. Blasse: Preparation, crystal structure, and luminescence of magnesium molybdate and tungstate monohydrates, MgMoO4 - H2O and MgWO4 - H2O. In: Journal of Solid State Chemistry. 77, 1988, p. 162, doi : 10.1016 / 0022-4596 (88) 90104-1 .
^ Gunter Buxbaum: Industrial Inorganic Pigments . John Wiley & Sons, 2008, ISBN 3-527-61210-6 , pp. 249 ( limited preview in Google Book search).
↑ G. Blasse, BC Grabmaier: Luminescent Materials . Springer Science & Business Media, 2012, ISBN 978-3-642-79017-1 , p. 112 ( limited preview in Google Book search).

[Alfa-1] ta sheet magnesium tungstate from AlfaAesar, accessed on June 11, 2016 ( PDF )(JavaScript required) .

[Sigma-2] ta sheet magnesium wolframate, −325 mesh, 99.9% trace metals basis from Sigma-Aldrich , accessed on June 11, 2016 ( PDF ).

[Allen_Alper-3] Allen Alper: High Temperature Oxides . Elsevier, 2012, ISBN 978-0-323-15834-3 , pp. 116 ( limited preview in Google Book search).

[mineralienatlas.de-4] ralienatlas.de: Mineralienatlas Lexikon - Huanzalait , accessed on June 11, 2016

[DOI10.1103/PhysRevB.83.214112-5] J. Ruiz-Fuertes, D. Errandonea, S. López-Moreno, J. González, O. Gomis, R. Vilaplana, FJ Manjón, A. Muñoz, P. Rodríguez-Hernández, A. Friedrich, IA Tupitsyna, LL Nagornaya: High-pressure Raman spectroscopy and lattice-dynamics calculations on scintillating MgWO ₄ : Comparison with isomorphic compounds. In: Physical Review B. 83, 2011, doi : 10.1103 / PhysRevB.83.214112 .

[Richard_C._Ropp-6] Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 845 ( limited preview in Google Book search).

[DOI10.1016/0022-4596(86)90096-4-7] John R. Günter, Erich Dubler: Crystal structure and topotactic dehydration of magnesium tungstate dihydrate, MgWO4 - 2H2O. In: Journal of Solid State Chemistry. 65, 1986, p. 118, doi : 10.1016 / 0022-4596 (86) 90096-4 .

[DOI10.1016/0022-4596(88)90104-1-8] M. Amberg, JR Günter, H. Schmalle, G. Blasse: Preparation, crystal structure, and luminescence of magnesium molybdate and tungstate monohydrates, MgMoO4 - H2O and MgWO4 - H2O. In: Journal of Solid State Chemistry. 77, 1988, p. 162, doi : 10.1016 / 0022-4596 (88) 90104-1 .

[Gunter_Buxbaum-9] Gunter Buxbaum: Industrial Inorganic Pigments . John Wiley & Sons, 2008, ISBN 3-527-61210-6 , pp. 249 ( limited preview in Google Book search).

[G._Blasse,_B.C._Grabmaier-10] G. Blasse, BC Grabmaier: Luminescent Materials . Springer Science & Business Media, 2012, ISBN 978-3-642-79017-1 , p. 112 ( limited preview in Google Book search).