Effects of Annealing in Different Atmosphere on the Near-Infrared Shielding Properties of Cs_xWO₃ Particles

Abstract:

Using sodium tungstate and cesium carbonate as raw materials, cesium tungsten bronze (Cs_xWO₃) powders were synthesized by low temperature hydrothermal reaction with citric acid as the reducing agent. Effects of annealing in different atmosphere on the near-infrared shielding properties of Cs_xWO₃ were investigated. The microstructure of Cs_xWO₃ powders was characterized by X-ray diffraction. The Cs_xWO₃ films were prepared on glass using polyvinyl alcohol solution as film-forming agent, and the optical transmission properties of Cs_xWO₃ films were investigated. The results indicate that the near-infrared shielding ability of samples after annealed at 200°C in the air atmosphere did not deteriorate apparently, but the 400°C-annealed samples in the air atmosphere showed apparent decrease of near-infrared shielding properties. Annealing in the carbon powder atmosphere had no apparent effects on the properties of Cs_xWO₃ particles. As for the N₂ annealing, the 500°C-annealed samples showed best improved near-infrared shielding as well as high transparency in the visible light region.

• Periodical: Advanced Materials Research (Volumes 712-715)
• Pages: 284-287
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.712-715.284
• Online since: June 2013
• Authors: Qiang Xu, Jing Xiao Liu, Fei Shi, Jia Yu Luo, Yan Yan Jiang, Gui Shan Liu
• Keywords: Annealing, Atmosphere, Cs_xWO₃, Hydrothermal Synthesis, Near-Infrared Shielding

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