Tungsten trioxide powder is a kind of transparent thermal insulation material discovered in recent years, which has good performance of shielding ultraviolet rays and near infrared rays in the sunlight.
Chemical Properties of Tungsten Trioxide Powder
The outer electron configuration of tungsten is 5d^46s^2. The complexity of the electronic structure of outer layer of tungsten makes it have multiple valence states. Therefore, there are five valence states including +2, +3, +4, +5, and +6 in the compound. And different valence states often coexist. The complexity of the outer electronic structure of tungsten can also make oxygen content in tungsten trioxide does not meet the strict requirement on stoichiometric ratio.
Tungsten trioxide is also commonly used to make electrochromic devices. The basic principle of electrochromism is that the reversible injection of materials by external ions and electrons causes W6+ and W5+ to interconvert, thereby achieving color changing (generally dark blue) and color fading of the material.
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