Cesium Tungstate Applied For Smart Glass Thermal Insulating Coating

Cesium tungstate for preparing smart glass thermal insulating coating is mainly hexagonal Cs0.33WO3 with excellent near-infrared absorption performance that can be synthesized by a facile molten-salt route. For example, some experts have prepared hexagonal Cs0.33WO3, Rb0.33WO3 and K0.30WO3 crystals by a facile molten-salt route.

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The experts prepared the three isostructural compounds successfully from the reaction of MxWO3 powders (M = Cs, Rb, K) in the CsCl/NaCl, RbCl/NaCl and KCl/NaCl fluxes, respectively. And it was found that the structure determination and refinement, based on single-crystal X-ray diffraction data, are in agreement with previous works, possessing space group P63/mcm. Both the volumes of unit-cell and WO6 octahedra vary linearly with M+ cations, which become smaller from Cs0.33WO3 to K0.30WO3. The distortion of WO6 octahedra as well as isotropic displacement parameters increases from Cs0.33WO3 to K0.30WO3. The geometry of the WO6 octahedron becomes more regular with increasing M+ cations. These structural trends arise from the effective size of the M+ cation.

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