本文選題：硬水鋁石 + 變色效應　； 參考：《光譜學與光譜分析》2017年11期

【摘要】：硬水鋁石(α-AlOOH)是鋁土礦的主要組成礦物之一,常用于工業(yè)提煉鋁以及制作耐火材料。近年來,一種具有變色效應的硬水鋁石晶體開始在市場中出現(xiàn)。采用X射線熒光能譜儀、紅外光譜儀、拉曼光譜儀、紫外可見近紅外分光光度計以及測量顏色參數(shù)等方法獲得了變色硬水鋁石和無變色效應硬水鋁石的光譜學特征,并探討了其變色效應的成因。變色硬水鋁石在日光下常呈黃綠色而在白熾燈下呈褐紅色,其紅外光譜與拉曼光譜與普通硬水鋁石的特征峰較為一致,其中紅外光譜中的特征峰主要集中在400~1 200,1 800~2 110和2 900~3 000cm~(-1)三個范圍內,拉曼特征峰則主要位于154,331,448,665和1 189cm-1附近。對比化學成分分析和紫外可見吸收光譜的測試結果,認為Fe~(3+)和Cr~(3+)的d—d電子躍遷導致變色硬水鋁石在可見光綠-黃綠色光區(qū)(500~560nm)和橙黃-紅色光區(qū)(600~780nm)的透射程度較為接近,環(huán)境光源中紅光和綠光相對功率分布的差異使硬水鋁石產(chǎn)生變色效應。對變色硬水鋁石在模擬日光和白熾燈光條件下的顏色參數(shù)進行了測定,結果顯示不同光源下樣品顏色參數(shù)a*和h0的變化,可定量地描述變色硬水鋁石的變色效應。為硬水鋁石的應用拓展、性能改善以及氫氧化物材料光學性質的深入探討提供了科學依據(jù)和數(shù)據(jù)支持。
[Abstract]:Hard boehmite (偽 -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.
【作者單位】： 中國地質大學(北京)珠寶學院;國土資源部珠寶玉石首飾管理中心;
【基金】：國土資源部公益性行業(yè)科研專項項目(201011005-2B) 國家自然科學基金項目(41373055)資助
【分類號】：O657.3;P575

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