Tungsten oxide can exhibit a variety of colors, including yellow, blue, purple and brown. These different colors are caused by factors such as the crystal structure, oxidation state and impurities of tungsten oxide.
Yellow Tungsten Oxide (YTO)
Yellow tungsten oxide is the most common tungsten oxide color, which is usually related to its purity and crystal structure. High-purity monoclinic tungsten oxide (such as W18O49) usually has a bright yellow color.
Blue Tungsten Oxide (BTO)
Blue tungsten oxide (WO2.9) is a special variant of tungsten oxide, usually with a special structure of oxidation state +4.9. Its color may be due to changes in electronic structure and energy bands.
Violet Tungsten Oxide (VTO)
Violet tungsten oxide (WO2.7) is another special tungsten oxide variant that usually has a special structure with a lower oxidation state (about +3.7). The purple color may be due to optical absorption and changes in the energy band structure.
Brown Tungsten Oxide
Brown tungsten oxide (WO2) is a darker shade of brown usually associated with the oxidation state and crystal structure of tungsten oxide. In some cases, tungsten oxide may appear brown due to insufficient oxidation.
The formation of color depends on the preparation conditions, crystal structure, oxidation state and impurities of tungsten oxide. Therefore, under specific experimental conditions, tungsten oxide variants of other colors may exist.
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