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Sodium tungsten bronze (Na WO3)-doped near-infrared-shielding bulk glasses for energy-saving applications

Yang, G., Qi, Y., Hu, D., Wang, H., Chen, H., Zhang, L., Cao, C., Liu, B., Xia, F.ORCID: 0000-0002-4950-3640 and Gao, Y. (2021) Sodium tungsten bronze (Na WO3)-doped near-infrared-shielding bulk glasses for energy-saving applications. Journal of Materials Science & Technology, 89 . pp. 150-157.

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Tungsten bronze coatings and films have attracted global attention for their applications in near-infrared (NIR)-shielding windows. However, they are unstable in strong ultraviolet, humid heat, alkaline and/or oxidizing environments and are difficult to be coated on glass surfaces with complex shape. Here, we address these limitations by doping sodium tungsten bronze (NaxWO3) into bulk glasses using a simple glass melting method. X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, TEM and SEM-EDS characterization confirmed the presence of sodium tungsten bronze (NaxWO3) functional units inside the 34SiO2-38B2O3-28NaF glass matrix. Because the functional units are well protected by the glass matrix, the fabricated glasses are stable under hot, humid, oxidizing conditions, as well as under ambient conditions, with no change after 360 days. The NIR-shielding performance of these glasses can be adjusted to as high as 100 % by varying WOx concentration (2−8 mol%) and quenching temperature (1000−1400 °C). With a content of 6 mol% WOx and a quenching temperature of 1000 °C, the bulk glass shows 63 % transmission of visible light and only 11 % transmission of NIR light at 1100 nm. Thermal insulation experiments show that the NIR-shielding performance of the glasses are far superior to commercial soda lime window glass or indium-doped tin oxide (ITO) glass, and comparable to cesium tungsten bronze coated glass. The novel bulk glasses have higher stability, simpler processing, and can be easily made into complex shapes, making them excellent alternative materials for energy-saving glasses.

Item Type: Journal Article
Murdoch Affiliation(s): Chemistry and Physics
Harry Butler Institute
Publisher: Elsevier BV
Copyright: © 2021 Elsevier B.V.
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