Like sodium tungsten bronze (NaxWO3) and potassium tungsten bronze (KxWO3), ammonium tungsten bronze ((NH4)xWO3) is also a kind of tungsten bronze. Although NaxWO3, KxWO3 and (NH4)xWO3 have similar crystal structures, that is, cubic crystals or tetragonal crystals, their physicochemical properties and uses are slightly different due to different added elements.
In terms of chemical composition, ammonium tungsten bronze is a non-stoichiometric compound composed of four elements: tungsten, nitrogen, hydrogen and oxygen. The English name is ammonium tungsten bronze (ATB). between 0 and 1.
From the structural point of view, ATB has two kinds of hexagonal structure and tetragonal structure. ATB with hexagonal structure is a slender round grain with a size between 80-500nm. There are two chemical valence states of W, +5 and +6, which are suitable as Blue tungsten in industrial production; ATB with a tetragonal structure has larger grains, lower ammonium content, less specific surface area, and weaker chemical activity.
From the perspective of physical and chemical properties, the appearance of ATB is blue powder, which has the characteristics of high chemical activity, large specific surface area, and strong reducibility. Note: As the value of x changes, the specific performance indicators of ammonium tungsten bronze will also be different.
From the point of view of the production method, the production steps of ATB are: first dissolve tungsten hexachloride in oleic acid solution, and stir evenly, then add oleylamine, mix until uniform, and finally move the mixed solution to the reaction kettle for crystallization After the reaction, the powder is centrifuged, washed and vacuum-dried to obtain the desired product.
In terms of usage, besides being used as blue tungsten oxide, ammonium tungsten bronze can also be used to produce tungsten powder and tungsten carbide powder. In addition, the film containing ATB nanopowder not only has high visible light transmittance, but also has strong ultraviolet and near infrared shielding ability.
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