Blue tungsten oxide powder for producing transparent thermal insulation film is formed by polymerizing crystal grains. However, some of the crystals of blue tungsten oxide powder are affected by the calcination atmosphere, so that they are also intercalated with violet tungsten oxide crystal grains or other crystal grains of tungsten oxides in addition to blue tungsten oxide crystal grains.
After the blue tungsten oxide was ground and dispersed, it was observed by transmission electron microscopy. And it was found that, in addition to cubic blue tungsten oxide crystal grains, there were needle-shaped violet tungsten oxide crystal grains. Therefore, it can be judged that in addition to blue tungsten oxide particles, the blue tungsten oxide powder sample also contains needle-like violet tungsten oxide particles. Violet tungsten oxide is the phase component we least expect to appear in blue tungsten oxide powder. While this phenomenon is present in many blue tungsten oxide samples. So the preparation of blue tungsten oxide needs to be perfected in the calcination process and equipment.
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