Blue nano tungsten oxide may be used to produce heat-insulating glass window film in a hydrogen reduction process. Some scholars have studied the reduction process of blue tungsten oxide to γ-tungsten oxide. It was found that as the blue tungsten oxide is reduced in hydrogen, the oxygen phase of the main phase component β-tungsten oxide in blue tungsten oxide decreases and the vacancy increases. The β-tungsten oxide is transformed into γ-tungsten oxide, and the surface roughness of the γ-tungsten oxide is further increased, the crack of the crack is enlarged. The particle is needle-like and short-rod, and the arrangement thereof is irregular, which is favorable for water discharge, and therefore hydrogen is introduced into the interior of particles for reduction more easily. The above process can be derived from the following image, from left to right in the figure, "particle morphology image of β-tungsten oxide and γ-tungsten oxide coexisting × 10000" and "particle morphology image of γ-tungsten oxide × 1000".
Among them, the particle morphology of γ-tungsten oxide depends on factors such as reduction temperature, heating rate, and thickness of the layer. Experiments show that it is beneficial to the formation of γ-tungsten oxide if the reduction temperature is not high, the heating rate is slow, and the thickness of the layer is thin.
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