光致变色
钨酸盐
钨
氧化剂
吸收(声学)
氧烷
可见光谱
材料科学
拉曼光谱
三元运算
光化学
分析化学(期刊)
无机化学
化学
光学
光电子学
光谱学
冶金
复合材料
有机化学
物理
量子力学
计算机科学
程序设计语言
作者
Gaël Poirier,Marcelo Nalin,Younès Messaddeq,Sidney José Lima Ribeiro
标识
DOI:10.1016/j.ssi.2007.01.012
摘要
Vitreous samples were prepared in the NaPO3–BaF2–WO3 ternary system with high WO3 concentrations. These glasses exhibit a strong absorption in the visible due to the presence of reduced tungsten species and the use of oxidizing species is required. The couple Sb2O3/NaNO3 was introduced in the composition and allowed to obtain transparent glasses. These oxidized samples were illuminated by visible laser radiation and showed an efficient volumetric photochromic effect. The photosensitive effect appeared as a dark spot throughout the entire volume of the glasses. The effect was investigated by several techniques such as, UV-visible absorption, Raman and XANES at the L1 and L3 tungsten absorption edges. The results suggest a photoreduction of tungsten atoms without structural changes of the viteous network. Finally, the photochromic effect can be erased by thermal treatment at 200 °C for a few minutes.
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