Cadmium tungstate

Structural formula
General
Surname	Cadmium tungstate
other names	CWO Cadmium tungsten oxide
Molecular formula	CdWO 4
Brief description	white to yellow solid
External identifiers / databases
CAS number 7790-85-4 EC number 232-226-2 ECHA InfoCard 100.029.297 PubChem 4985693 Wikidata Q1969116
properties
Molar mass	360.25 g mol −1
Physical state	firmly
density	8.0 g cm −3
Melting point	1325 ° C
solubility	poorly soluble in water soluble in ammonium hydroxide
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary Caution H and P phrases H: 302-312-332-315-319-335-410 P: 261-273-302 + 352-312-304 + 340 + 312-337 + 313-391
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Cadmium tungstate is an inorganic chemical compound of cadmium from the group of tungstates .

Extraction and presentation

Cadmium tungstate can be obtained by reacting cadmium oxide with tungsten trioxide or cadmium salt solutions (such as cadmium nitrate or cadmium (II) chloride ) with sodium tungstate .

${\displaystyle \mathrm {CdO+WO_{3}\ \longrightarrow {}\ CdWO_{4}} }$

${\displaystyle \mathrm {Cd(NO_{3})_{2}+Na_{2}WO_{4}\ \longrightarrow {}\ CdWO_{4}\downarrow +\ 2\ NaNO_{3}} }$

properties

Cadmium tungstate is a white to yellow solid that is sparingly soluble in water. It has a monoclinic crystal structure with the space group P 2 / c (space group no. 13) .

use

Cadmium tungstate is used as a scintillator in particle physics . It is also used in fluorescent paints and X-ray screens .

Individual evidence

1. ^ ^{A b c} William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 54 ( limited preview in Google Book search).
2. ↑ ^{a b c} R. Blachnik: Pocket book for chemists and physicists Volume 3: Elements, inorganic compounds and materials, minerals . Springer-Verlag, 2013, ISBN 978-3-642-58842-6 , pp. 370 ( limited preview in Google Book search).
3. ↑ ^{a b c} data sheet cadmium tungstate, −325 mesh from Sigma-Aldrich , accessed on June 11, 2016 ( PDF ).
4. ↑ crystals.saint-gobain.com: CdWO4 data sheet.pdf ( Memento of the original from June 12, 2016 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. , accessed June 12, 2016 
5. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry cadmium compounds, with the exception of cadmium selenosulphide (xCdS.yCdSe) and reaction mass of cadmium sulphide and zinc sulphide (xCdS.yZnS) , Reaction mass of cadmium sulfide and mercury sulfide (xCdS yHgS) as well as the cadmium compounds, which are listed separately in this appendix in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on March 23, 2019. Manufacturers or distributors can use the harmonized classification and expand labeling .
6. ↑ S. Mostafa Hosseinpour-Mashkani, Ali Sobhani-Nasab: A simple sonochemical synthesis and characterization of CdWO ₄ nanoparticles and its photocatalytic application. In: Journal of Materials Science: Materials in Electronics. 27, 2016, p. 3240, doi : 10.1007 / s10854-015-4150-5 .
7. ↑ Yonggang WANG, Linlin YANG, Yujiang WANG, Xin XU, Xiaofeng WANG: Controllable synthesis of CdWO ₄ nanorods and nanowires via a surfactant-free hydrothermal method. In: Journal of the Ceramic Society of Japan. 120, 2012, p. 259, doi : 10.2109 / jcersj2.120.259 .
8. ^ Y. Abraham, NAW Holzwarth, RT Williams: Electronic structure and optical properties of CdMoO ₄ and CdWO ₄ . In: Physical Review B. 62, 2000, p. 1733, doi : 10.1103 / PhysRevB.62.1733 .
9. ↑ L. Bardelli, M. Bini, PG Bizzeti, L. Carraresi, FA Danevich, TF Fazzini, BV Grinyov, NV Ivannikova, VV Kobychev, BN Kropivyansky, PR Maurenzig, LL Nagornaya, SS Nagorny, AS Nikolaiko, AA Pavlyuk, DV Poda, IM Solsky, MV Sopinskyy, Yu.G. Stenin, F. Taccetti, VI Tretyak, Ya.V. Vasiliev, SS Yurchenko: Further study of CdWO ₄ crystal scintillators as detectors for high sensitivity experiments: Scintillation properties and pulse-shape discrimination. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 569, 2006, p. 743, doi : 10.1016 / j.nima.2006.09.094 .
10. ^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 84 ( limited preview in Google Book search).