Tungsten Trioxide Crystal Structure

The ideal tungsten oxide crystal is a colorless and transparent insulator in strict accordance with the stoichiometric ratio. The chemical formula is Re O3. As shown in the figure can be seen tungsten oxide crystal structure. The ideal tungsten trioxide has a molecular weight of 231.85. The ideal density of 7.16g / cm3, the melting point of 1473 degrees Celsius, the boiling point of 1750 degrees Celsius, forbidden band width of 2.9eV. The chemical properties of tungsten trioxide at a relatively low temperature will be in a relatively stable state.

However, during the actual working and production of tungsten trioxide, due to the defects of oxygen atoms in the crystal structure of tungsten oxide or the deformation of the crystal structure of tungsten trioxide, the formula of tungsten trioxide will be changed to tungsten trioxide-x. Resulting in the crystal structure of tungsten trioxide is not octahedron, but has a certain degree of distortion.

In recent years there are many ways to synthesize tungsten trioxide, of which magnetron sputtering method is a widely used preparation method. The tungsten trioxide film prepared by magnetron sputtering has better adhesion, uniform film thickness and stable crystal structure. Both for experimental research, but also easy to large-scale industrial production. These advantages make magnetron sputtering a relatively ideal method for the preparation of tungsten trioxide. The preparation of tungsten trioxide by RF magnetron sputtering can study the effect of argon-oxygen ratio, sputtering power and reaction pressure on the electrochromic properties.

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