Calcium tungstate

Base Information

• Chemical Name: Calcium tungstate
• CAS No.: 7790-75-2
• Deprecated CAS: 113933-94-1,210909-23-2,699019-75-5,1362691-61-9,1412435-72-3,1786413-14-6,2095253-92-0,2266561-57-1,2703860-32-4,2749963-17-3
• Molecular Formula: Ca*O₄W
• Molecular Weight: 287.926
• Hs Code.: 28418030
• Mol file: 7790-75-2.mol

Synonyms:Tungsticacid (H2WO4), calcium salt (1:1) (8CI);C.I. 77250;Calcium tungstate;Calciumtungstate (CaWO4);Calcium tungsten tetraoxide;Cronex Par Speed;Detail;DuPont Hi-Plus;EU-V 1A;EU-V 2;Hi-Plus;Lightning-Plus;Tungstate (WO42-),calcium (1:1), (T-4)-;Tungsten Yellow;VP 2;VP 2 (tungstate);

Chemical Property of Calcium tungstate

Chemical Property:

• Appearance/Colour: powder
• Melting Point: 1620 °C
• PSA: 80.26000
• Density: 6.06 g/mL at 25 °C(lit.)
• LogP: -0.47520
• Storage Temp.: -20°C
• Solubility.: Insoluble in H{2}O. Decomposes by hot HCl, HNO{3}
• Water Solubility.: insoluble H2O; decomposed by hot HCl, HNO3 [MER06]
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 4
• Rotatable Bond Count: 0
• Exact Mass: 287.893183
• Heavy Atom Count: 6
• Complexity: 85.2

Purity/Quality:

99.9% ^*data from raw suppliers

Calcium tungstate, 98% ^*data from reagent suppliers

Safty Information:

• Pictogram(s):  
• Hazard Codes: 

MSDS Files:

SDS file from LookChem

Useful:

• Canonical SMILES: [O-][W](=O)(=O)[O-].[Ca+2]
• Uses: Calcium tungsten oxide is used as a luminophore. Calcium tungstate can be ued for preparing screens for x-ray observations and photographs; in luminous paints; in scintillation counters.

Technology Process of Calcium tungstate

There total 81 articles about Calcium tungstate which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield: 95.24%

sodium tungstate + calcium(II) nitrate (13477-34-4) → calcium tungstate (7790-75-2)

Guidance literature:

With sodium nitrate; In melt; mixt. of NaNO3, Ca(NO3)2 and Na2WO4 heated in fused quartz tube at 400°C for 40-50 min with periodic stirring of the melt; poured into porcelain cup; cooled; washed with H2O; dried to const. weight at 200°C; elem. anal.;

DOI:10.1134/S0036023606040036

Reference yield:

sodium tungstate + calcium carbonate (792848-15-8) → scheelite (7790-75-2) + sodium carbonate (497-19-8)

Guidance literature:

In water; Displacement reactions are carried out with single crystal plates and powders which are reacted at different temp. (20-100°C) with an excess of aq. Na-salt soln. for different times.;

DOI:10.1016/0040-6031(88)87147-8

Reference yield:

sodium tungstate + aragonite (792848-15-8) → scheelite (7790-75-2) + sodium carbonate (497-19-8)

Guidance literature:

In water; Displacement reactions are carried out with single crystal plates and powders which are reacted at different temp. (20-100°C) with an excess of aq. Na-salt soln. for different times.;

DOI:10.1016/0040-6031(88)87147-8

upstream raw materials:

calcium chloride

calcium(II) nitrate

tungsten

sodium tungstate (VI) dihydrate

Refernces

• 1、 Charkin,Kazakov,Lebedev. "Study of cationic substitution in Bi2WO6 and derived structures in the framework of the modular approach". . p. 1248 - 1256. Retrieved 2010.
• 2、 Wu, Feng-Nian,Yu, Hua-Jian,Hu, Yan-Yan,Zhang, Hua-Di,Zhang, Rui,Li, Jing,Liu, Bing,Wang, Xu-Ping,Yang, Yu-Guo,Wei, Lei. "Effects of slight structural distortion on the luminescence performance in (Ca1-xEux)WO4 luminescent materials". . p. 237 - 246. Retrieved 2021.
• 3、 Sanchez, C.,Livage, J.,Launay, J. P.,Fournier, M.,Jeannin, Y.. "Electron Delocalization in Mixed-Valence Molybdenum Polyanions". . p. 3194 - 3202. Retrieved 1982.
• 4、 Li, Liping,Su, Yiguo,Li, Guangshe. "Size-induced symmetric enhancement and its relevance to photoluminescence of scheelite CaWO4 nanocrystals". . . Retrieved 2007.
• 5、 Gaultois, Michael W.,Dunstan, Matthew T.,Bateson, Adam W.,Chan, Martin S. C.,Grey, Clare P.. "Screening and Characterization of Ternary Oxides for High-Temperature Carbon Capture". . p. 2535 - 2543. Retrieved 2018.
• 6、 Xu, Wei,Cui, Ying,Hu, Yuwei,Zheng, Longjiang,Zhang, Zhiguo,Cao, Wenwu. "Optical temperature sensing in Er3+-Yb3+ codoped CaWO4 and the laser induced heating effect on the luminescence intensity saturation". . p. 547 - 555. Retrieved 2017.
• 7、 Abdel-Rehim. "Thermal analysis and X-ray diffraction of synthesis of scheelite". . p. 1283 - 1296. Retrieved 2001.
• 8、 Zhang,Fang,Tang,Hou,Qiu. "Synthesis and characterization of CaWO4 phosphor powders in glycerol solvent by solvothermal method". . p. 2386 - 2388. Retrieved 2015.
• 9、 Barbosa, Helliomar P.,Silva, Ivan G.N.,Felinto, Maria Claudia F.C.,Teotonio, Ercules E.S.,Malta, Oscar L.,Brito, Hermi F.. "Photoluminescence of single-phased white light emission materials based on simultaneous Tb3+, Eu3+and Dy3+doping in CaWO4matrix". . p. 820 - 827. Retrieved 2017.
• 10、 Gomez, Germán E.,López, Carlos A.,Ayscue, R. Lee,Knope, Karah E.,Torres Deluigi, Mariá Del R.,Narda, Griselda E.. "Strong photoluminescence and sensing performance of nanosized Ca0.8Ln0.1Na0.1WO4 (Ln = Sm,Eu) compounds obtained by the dry top-down grinding method". . p. 12080 - 12087. Retrieved 2019.