F-doped cesium tungsten bronze may be applied for preparing window heat insulation film. According to experts, the key to improve the near-infrared shielding performance of F-doping cesium tungsten bronze is to select a suitable heat treatment time and temperature. But what effect does heat treatment have on F doped cesium tungsten bronze?
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Experts say that a suitable heat treatment temperature helps to fix the F- in the lattice. While if the heat treatment temperature is too high, it tends to cause F- to escape the lattice. Therefore, choosing proper heat treatment time and temperature is a key for improving the properties of F doping cesium tungsten bronze. Further, since W element in cesium tungsten bronze is in a reduced state, cesium tungsten bronze will be oxidized to cesium tungsten acid salt when it is heat-treated by exposure to air. Therefore, the expert heat-treated the F doped cesium tungsten bronze at different temperatures for different times by introducing N2 as a shielding gas in a tube-type heating furnace. Experts also mentioned that heat treatment plays an important role in crystal form and properties of cesium tungsten bronze. After heat treatment, the crystal form of cesium tungsten bronze becomes complete, but the particle size becomes large. Complete crystal form can improve the near-infrared shielding performance. While it will reduce the absorption of near-infrared rays if the particle size becomes large.
