Violet Tungsten Oxide (VTO or TVO) is the abbreviation of purple tungsten oxide. It is a kind of purple powder composed of 18 tungsten atoms and 49 oxygen atoms. Violet tungsten is the crystal structure of tungsten oxide. A special kind, the chemical formula of violet tungsten is W18O49 or WO2.72, and the molecular weight is 227.36.
Violet tungsten is a different form of tungsten oxide, which has a unique crystal structure from other tungsten oxides (blue tungsten), and its properties are also quite different. The large particles of blue tungsten have sharp edges and corners, and are composed of small cubes. The surface is broken to varying degrees and covered with cracks; the morphology of violet tungsten is obviously different from the other three. The large particles are loose particle clusters composed of needle-like or rod-like grains. All tungsten oxide pellets.
There are abundant cracks inside, among which the purple tungsten pellets are not only rich in cracks, but also the internal particles are needle-shaped or rod-shaped. The structure of violet tungsten particles has large gaps, which makes the bulk density low, which is conducive to the infiltration of hydrogen and the escape of water vapor during the reduction process, so that the reduction not only starts from the surface, but also proceeds simultaneously inside. The particle shape of violet tungsten is rod-shaped, and the shape of other tungsten oxide particles is nearly spherical; the particle size is the largest in violet tungsten particles.
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