As a typical tungsten oxide (WO3-x), blue tungsten oxide (referred to as “blue tungsten”), also known as tungsten blue oxide, refers to a class of tungsten (VI) and tungsten (V) mixed valence It is an inorganic compound composed of 20 tungsten atoms and 58 oxygen atoms. It is an oxygen deficiency/oxygen vacancy tungsten oxide. The English name is Blue Tungsten Oxide (abbreviated as BTO), and the chemical formula is WO2. 90 or W20O58. Note: Due to the different calcination conditions, the obtained blue tungsten phase composition is also different, but it is based on WO2.90 or ammonium tungsten bronze (ATB) as the main phase.
From the perspective of microstructure, blue tungsten maintains the appearance of ammonium paratungstate (APT), that is, the surface is broken to varying degrees and covered with cracks; large particles have sharp edges and corners, and are formed by agglomeration of small cubes. ; Molecular structure is a WO6 octahedron, composed of 8 tungsten ions and 24 oxygen ions.
From the point of view of physical and chemical properties, the appearance of blue tungsten is blue or dark blue powder, the measured density is 7.15 g/cm3, and the X-ray density is 7.16 g/cm3. Oxidation, good photochromic and electrochromic effects and other characteristics. From the point of view of the production method, the preparation method of blue tungsten is similar to that of purple tungsten, including closed calcination method of tungsten trioxide, APT hydrogen reduction method and direct synthesis method. It should be noted that the process parameters of the two are slightly different, mainly reflected in the concentration and flow rate of the reducing gas.
From the point of view of use, blue tungsten oxide can not only be used to produce lower-priced tungsten oxide, metal tungsten powder, tungsten carbide powder and tungstate, but also can be used as an oxygen scavenger for vacuum equipment and a color change for smart windows. Raw materials, gas sensitive materials, etc.
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