Blue Tungsten Oxide
Tungsten oxide (W2O3) is a compound of tungsten and oxygen. It has beenreported (2006) as being grown as a thin film by atomic layer deposition at temperatures between 140-240 °C using W2(N(CH3)2)6 as a precursor. It is not referred to in major text books e.g. Some older literature refers to the compound W2O3 but as the atomic weight of tungsten was believed at the time to be 92, i.e approximately half the modern accepted value of 183.84 the compound actually being referred to was WO3.Blue tungsten oxide is is also called tungsten blue oxide (TBO). It is used primarily for the production of tungsten metal power and tungsten carbide. The formula of blue tungsten is H0.5WO3. Blue tungsten oxide is finely divided blue-violet crystalline powder and it is produced by rotary calcining ammonium paratungstate at closely controlled temperatures in a reducing atmosphere. And we usually use APT to manufacture it by calcination. Blue tungsten oxide paly an important role in the line from oxide to W and WC powder. The color varies between deep dark blue to blue,faint blue and green blue. Also the TBO particles are pseudomorphous to the original APT crystals, as described for tungsten trioxide. It is not a chemically defined compound, but consists of various different constituents, like trioxide, tungsten bronzes and different lower tungsten oxides. The relative amount of these compounds in TBO depends on the calcination parameters.
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