变色硬水铝石的光谱学特征及其变色机理

发布时间：2018-06-23 04:07

本文选题：硬水铝石 + 变色效应　；参考：《光谱学与光谱分析》2017年11期

【摘要】：硬水铝石(α-AlOOH)是铝土矿的主要组成矿物之一,常用于工业提炼铝以及制作耐火材料。近年来,一种具有变色效应的硬水铝石晶体开始在市场中出现。采用X射线荧光能谱仪、红外光谱仪、拉曼光谱仪、紫外可见近红外分光光度计以及测量颜色参数等方法获得了变色硬水铝石和无变色效应硬水铝石的光谱学特征,并探讨了其变色效应的成因。变色硬水铝石在日光下常呈黄绿色而在白炽灯下呈褐红色,其红外光谱与拉曼光谱与普通硬水铝石的特征峰较为一致,其中红外光谱中的特征峰主要集中在400~1 200,1 800~2 110和2 900~3 000cm~(-1)三个范围内,拉曼特征峰则主要位于154,331,448,665和1 189cm-1附近。对比化学成分分析和紫外可见吸收光谱的测试结果,认为Fe~(3+)和Cr~(3+)的d—d电子跃迁导致变色硬水铝石在可见光绿-黄绿色光区(500~560nm)和橙黄-红色光区(600~780nm)的透射程度较为接近,环境光源中红光和绿光相对功率分布的差异使硬水铝石产生变色效应。对变色硬水铝石在模拟日光和白炽灯光条件下的颜色参数进行了测定,结果显示不同光源下样品颜色参数a*和h0的变化,可定量地描述变色硬水铝石的变色效应。为硬水铝石的应用拓展、性能改善以及氢氧化物材料光学性质的深入探讨提供了科学依据和数据支持。
[Abstract]:Hard boehmite (伪 -AlOOH) is one of the main minerals of bauxite, which is often used in industrial extraction of aluminum and in the manufacture of refractories. In recent years, a hard-boehmite crystal with discoloration effect began to appear in the market. The spectroscopic characteristics of chromotropic hard boehmite and non-chromotropic hard boehmite were obtained by means of X-ray fluorescence spectrometer, infrared spectrometer, Raman spectrometer, UV-Vis near infrared spectrophotometer and measurement of color parameters. The cause of its discoloration effect is also discussed. The chromatic hard boehmite is usually yellowish green in the sun and brownish red in the incandescent lamp. Its infrared and Raman spectra are consistent with the characteristic peaks of the common hard boehmite. The characteristic peaks in IR spectra are mainly in the range of 1 800 cm ~ (-1) and 2 900 ~ (3 000) cm ~ (-1), while the Raman characteristic peaks are mainly located in the vicinity of 154331448665 and 1 189cm-1. Compared with chemical composition analysis and UV-Vis absorption spectra, the d-d electron transitions of Fe ~ (3) and Cr ~ (3) lead to the close transmission of chromotropic hard boehmite in the visible green-yellowish green (500~560nm) and orange yellow-red (600~780nm) regions. The difference of relative power distribution between red light and green light in ambient light source results in discoloration effect of hard boehmite. The color parameters of discoloration hard boehmite under simulated sunlight and incandescent lighting are measured. The results show that the variation of sample color parameters a * and h 0 under different light sources can quantitatively describe the discoloration effect of discoloration hard boehmite. It provides scientific basis and data support for the application of hard boehmite, the improvement of properties and the further study of optical properties of hydroxide materials.
【作者单位】：中国地质大学(北京)珠宝学院;国土资源部珠宝玉石首饰管理中心;
【基金】：国土资源部公益性行业科研专项项目(201011005-2B) 国家自然科学基金项目(41373055)资助
【分类号】：O657.3;P575

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