Crystal Structure and Optoelectronic Properties of Hexagonal MxWO_3

摘要

Hexagonal tungsten bronze (HTB) MxWO_3 (M= alkali metal; 0.19 ≤ x ≤ 0.37) has been studied in recent years because it has the excellent shielding characteristic in the range of near infrared (NIR) and ultraviolet wavelengths. It can be used as thermal insulation layer in the field of architectural and automotive window glasses. To improve the NIR-shielding performance HTB, it is imperative to confirm the crystal structure and then make clear the NIR-shielding mechanism of Cs_(0.33)WO_3 for enhancing the NIR-shielding efficiency.To produce single crystal via molten-salt method. The crystal structure was also analyzed and refined with a full-matrix least-squares method of the Bruker SHELTAL software package based on the XRD intensity data. Consequently, the experimental results indicate that the space group of the HTB is P6_322.The absorption spectra of CsxWO_3 nanoparticles clearly exhibit that the absorption with the maximum transmission percent of visible light occurred at wavelengths close to 530 nm and NIR were cut off in therange of 900 to 2100 nm.