CsxWO3 Applied for Near-infrared Shielding Material

CsxWO3, as a near-infrared shielding material, can be prepared by a molten salt method at an air atmosphere of 400 °C. What is CsxWO3? It is cesium tungsten bronze. Why use the molten salt method? Because the reaction temperature of the conventional solid-phase method is too high. And it requires an atmosphere. So, the molten salt method is selected to save production costs.

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Some experts have prepared cesium tungsten bronze by molten salt method, and studied its micromorphology, thermal stability and optical properties. Wherein, the reaction raw materials are the same as the solid-phase method’s, and the molten salt is a mixed salt of LiCl/KCl. The experimental results show that CsxWO3 prepared by the molten salt method is nanorod-shaped. The thermogravimetric test results show that after the raw materials and molten salt are mixed uniformly, when the temperature is raised from room temperature to 150 °C, the adsorbed water is released on the surface of the reactant, and the reactant loses bound water at 220 °C. At 345 °C, the molten salt LiCl-KCl began to melt, accelerating the mass transfer of the reactants and blocking the air to form CsxWO3. Optical performance test results show that CsxWO3 has high visible light transmittance (54%) and excellent near-infrared shielding performance (94%).

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