Barium tungstate

Barium Tungstates.—The anhydrous normal salt, BaW04, may be obtained by fusing together sodium tungstate, sodium chloride, and barium chloride. It crystallises in colourless octahedra—tetragonal... 

Barium tungstate has been recommended for use instead of white lead and for colouring porcelain. ... 

The theory of electronic excitation, which occurs during plastic deformation and fragmentation of crystals, is discussed by Molotskii [99]. The mechanochemistry of inorganic solids has been reviewed by Boldyrev et al. [100] with particular reference to the work done in The Institute of Solid State Chemistry at Novosibirsk. The consequences of mechanical activation on the structures and properties of selected spinels have been examined and the rate of the reaction forming barium tungstate investigated. Prospects for the future development of this subject are assessed. 

The vaporization of barium tungstates (Sect. 4.2) is of interest for thermionic emitters used in certain types of arc lamps, that of ZrOj-based solid solutions for high-refractory ceramics (Sect. 4.3), and that of glasses for their production (Sect. 

In addition to the above, preparation in w/o microemulsions of nanoparticles of various other types of compounds, viz. silica-coated iron oxide, Fe203-Ag nanocomposite, oxides of ytrium, erbium, neodymium, vanadium and cobalt, titanates of barium and lead, ferrites of barium, strontium, manganese, cobalt and zinc, oxide superconductors, aluminates, zirconium silicate, barium tungstate, phosphates of calcium, aluminium and zinc, carbonates of calcium and barium, sulphides of molybdenum and sodium, selenides of cadmium and silver etc. have been reported. Preparative sources and related elaboration can be found in [24]. 

In the last step, the mixture is boiled. No colored precipitate is formed (distinctions of selenates and tungstates). Had the white precipitate been barium selenates or barium tungstates, they would have been reduced to elemental selenium and wolfram blue, respectively. ... 

Figure 8.1. Plots of equations 8.2 [O] and 8.3 [%]for data from the precipitation of barium tungstate at an initial concentration of 3 mol m. D is the median particle size ( am). After Sdhnel and Mullin, 1991)...

Figure 5.2. Microemulsion-generated (procedure described in [329]) barium tungstate nanowires. Photomicrograph kindly supplied by Prof. Limin Qi, Peking University, Beijing, People s Republic of China.

Barium titanate yellow, 2Ni0.3Ba0.17Ti02, is priderite yellow. Barium tungstate, BaW03, is hsted by the Colour Index (1971) as Cl 77128/Pigment White 13. 

Barium tungstate Raspite Stolzite Tungsten white... 

Lead tungstate (. v.) has been synthesised as a white pigment, as described by Riffault et al. (1874), although it is unknown what crystal system the synthetic form takes. It is sometimes referred to as tungsten white, although this is also apphed to barium tungstate (qq.v.). 

Lead group Tungsten group Albite Barium tungstate Lead tungstate Muscovite Quartz Raspite Scheelite Tungsten white Bersch (1901) 128 Bywater(1983) Kilias Konnerup-Madsen (1997) Plakhov et al. (1971) Riffault et al (1874) 159-160 Salter (1869) 414 15... 

Tungsten group Barium tungstate Bismuth vanadate Cadmium... 

Tungsten gronp Tungsten oxides and hydroxides group Barium tungstate Lead tungstate... 

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