As a typical tungsten oxide, purple tungsten oxide (referred to as “purple tungsten”), also known as tungsten purple oxide, is an inorganic compound composed of 18 tungsten atoms and 49 oxygen atoms. It is an oxygen vacancy Tungsten oxide is a purple or blue-purple finely divided crystalline powder, its English name is Violet Tungsten Oxide or Purple Tungsten Oxide (abbreviated as VTO), its chemical formula is W18O49 or WO2.72, and its molecular weight is 227.36. The valence of tungsten in W18O49 is +5 or +6.
From the structural point of view, purple tungsten has a unique crystal structure. Each large particle is a loose particle group composed of needle-shaped or rod-shaped grains, and there are abundant cracks inside the particle group, which makes purple tungsten have excellent physical properties. chemical properties.
From the perspective of physical and chemical properties, the appearance of purple tungsten is purple or blue-purple powder, with a density of 7.724-7.989 g/cm3 and an X-ray density of 7.78 g/cm3. It can be dissolved in ammonia and lye, and insoluble in water, alcohol and most acids. Liquid, with large specific surface area, high chemical activity, low bulk density, high reduction, weak oxidation, good electrochromic performance, heat insulation performance, ultraviolet and near-infrared light absorption characteristics, etc.
From the perspective of production methods, the main preparation methods of purple tungsten include tungsten trioxide (WO3) closed calcination method, ammonium paratungstate (APT) hydrogen reduction method and direct synthesis method. Among them, WO3 closed calcination method: first mix tungsten powder and WO3 according to a certain ratio, and then put the mixed powder in a closed environment for calcination. APT hydrogen reduction method, under certain conditions, ammonium paratungstate is calcined, and ammonia gas is decomposed to produce hydrogen, so that APT is calcined in a reducing atmosphere, decomposed and reduced to purple tungsten. Direct synthesis method: Under certain conditions, react tungsten powder with oxygen to obtain violet tungsten.
From the point of view of use, the uses of purple tungsten oxide include making tungsten products, making lithium battery negative electrode materials, making light-switching glass, making near-infrared photothermal diagnosis and treatment drugs, making photocatalysts, making shielding materials, making fuel cell carriers, and making resistance components.
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