Tungstates


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tungstates

 

salts of tungstic acid. There are normal tungstates—the salts of H2WO4 (such as H2O·WO3)— and polytungstates—salts of polyacids with the general formula .xH2O · y WO3, which are not separated out in the free state. Polytungstates conform to the general formula xMe2O · yWO3 (where x < y); their nomenclature is complicated (metatungstates, paratungstates, and others). Several normal tungstates have practical uses—for example, Na2WO4, CaWO4, and ammonia paratungstate 5(NH4)2O · 12WO3 · 11H2O. Tungstates are used in the textile and paint and varnish industries and in X-ray technology.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
[40]that the primitive cell of the tungstate crystal includes two formula units, and the Raman spectra of scheelite crystals can be divided into two groups, internal and external.
The scheelite tungstate compounds are well known for their luminescence activity.
Thus, the application of ZnW[O.sub.4] photocatalyst has been limited, and an energy saving and environmently friendly synthesis method of nanoscale tungstate has received extensive attention.
Sodium tungstate ([Na.sub.2] W[O.sub.4] x 2[H.sub.2]O) and zinc chloride (Zn[Cl.sub.2]) were the staring materials.
Electrochemical Characteristics of Lithium Insertion in Several 3D Metal Tungstates (MWO4, M=Mn, Co, Ni and Cu) Prepared by Aqueous Reactions, Ceram.
Scheelite calcium tungstate is well known for their interesting luminescence and structural particularities and therefore has been extensively studied during the past century.
Nanostructured tungstate materials have aroused much interest because of their luminescence behaviour, structural properties, and potential applications.
In the present work, manganese tungstate nanoparticles are synthesized by careful control of the reaction kinetics of aqueous precipitation.
Tungsten-188 with a maxima specific activity of 185 GBq per gram of tungsten as sodium tungstate in 0.26 mol [L.sup.-1] of NaOH, with a concentration of 7.6 GBq per millilitre, can be used.
[25] proposed a new concept in which [sup.188]W obtained by (n, [gamma]) reaction of natural tungsten can be incorporated into a titanium tungstate based gel.