The reason why tungsten trioxide powder can be used to prepare thermal insulation dispersion is that WO3 has photochromic properties. And this kind of performance is due to the unique phase structure of WO3, which results in excellent and unique physicochemical properties.
Tungsten trioxide also has good application prospects in the fields of photocatalytic materials, photosensitive materials, electrochromic materials, and thermochromic materials, such as photochromic devices, solar energy devices, smart windows, sensors, photoelectrochemical devices, and the like. This is also due to the fact that WO3 has a variety of phase structures, such as monoclinic phase, orthorhombic phase, cubic phase, hexagonal phase, and so on, while WO3 with one of these phase structures has excellent and unique physicochemical properties. It is worth to note that the crystal structure of tungsten trioxide is temperature dependent. It is tetragonal at temperature above 740°C, orthorhombic at the temperature range of 330~740°C, monoclinic at the temperature range of 17~330°C, and triclinic at the temperature range of -50~17°C. The most common structure of WO3 is monoclinic.
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