Tungsten trioxide, with molecular formula WO3 and molecular weight of 231.85, is a kind of tungstic anhydride.
It is a kind of tungstic anhydride, a tungstate product. Tungsten oxide includes tungsten trioxide and tungsten dioxide, and there is no tungsten dioxide product in actual industrial production. Tungsten trioxide salt is divided into tungstic acid, sodium tungstate, calcium tungstate, ammonium secotungstate, ammonium metatungstate and other products according to the content of tungsten trioxide.
The color of tungsten oxide nanoparticles, in the W – O system, there are tungsten oxides such as WO3, WO 2.9, WO 2.72, WO2, etc. WO3 (yellow) — WO 2.90 (blue) – WO 2.72, (violet) That is to say, there are three kinds of stable oxides of tungsten: yellow oxides (WO3, VK-WO3), blue oxides (WO2.90, VK-WO2.9), violet oxide (WO2.72, VK-WO2.7).
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