缅甸绿色翡翠的致色机理及色度学研究

发布时间：2018-07-07 16:51

本文选题：翡翠 + 致色机理　；参考：《昆明理工大学》2015年硕士论文

【摘要】：翡翠的颜色是衡量其市场价值的重要指标之一,关于翡翠的致色机理和色度的差异,一直以来都是科学研究中的重点和难点。本研究采用红外光谱仪、能谱仪、紫外—可见分光光度计和USB2000+光纤光谱仪等仪器对缅甸翡翠进行测试,主要对比分析了无色翡翠和绿色翡翠以及不同色级的绿色翡翠在成分、结构以及颜色等方面的差异,重点分析了翡翠的致色机理,并依据色度学原理进行颜色的量化分级。研究结果如下：(1)红外光谱的测试中发现,在3500cm-1的位置均有宽吸收带出现；在1080cm-1、 960 cm-1、745cm-1、664cm-1、588cm-1和530cm-1附近出现了典型吸收峰；通过透射红外光谱吸收峰的位置可以区分硬玉质翡翠和绿辉石质翡翠。(2)能谱测试中,白色翡翠只检测到Na、Al、O和Si元素,而这些都是组成硬玉的主要元素；绿色翡翠除检测到Na、Al、O和Si元素以外,还检测到Cr、Mg、 Fe和Ca等元素；Cr与Mg、Fe、Ca的相对含量存在差异时会导致翡翠的颜色产生变化。(3)紫外可见吸收光谱的分析发现,均在437nm的位置存在吸收峰；绿色翡翠与白色翡翠相比出现了明显的Cr3+的吸收峰,表明绿色是因Cr元素的存在而导致的。(4)淡绿色翡翠样品的反射率曲线表现比较平缓且反射率大多位于10%～20%之间,反射峰位于500nm左右的位置；绿色由淡至浓的翡翠样品的反射率曲线的特点主要为反射峰比较尖锐且大多位于530nm的位置,同时,反射率多位于10%-30%之间。(5)绿色翡翠的色调角位于(1950,210°),主波长在491nm～493nm范围内,色调为蓝绿色；色调角位于(180°,195°),主波长在493nm～497nm范围内,色调为泛蓝的绿色；色调角位于(165°,180°),主波长在497nm～509nm范围内,色调为绿色；色调角位于(150°,1650),主波长在509nm～538nm范围内,色调为泛黄的绿色；色调角位于(1350,1500),主波长在539nm～553nm范围内,色调为黄绿色。
[Abstract]:The color of jadeite is one of the important indexes to measure the market value of jadeite. The difference of color mechanism and chromaticity of jadeite has always been the focus and difficulty in scientific research. In this study, the Myanmar jadeite was tested by infrared spectrometer, energy spectrometer, UV-Vis spectrophotometer and USB2000 optical fiber spectrometer. Based on the differences in structure and color, the mechanism of color formation of jadeite jade was analyzed, and the color quantification classification was carried out according to the principle of chromaticity. The results are as follows: (1) it is found that there are wide absorption bands in 3500cm-1, typical absorption peaks appear near 1080cm-1,960 cm-1745cm-1664cm-1588cm-1 and 530cm-1. The hard jade and the green pyrophyllite jadeite can be distinguished by the position of the absorption peak of the transmission infrared spectrum. (2) in the energy spectrum test, only the elements of Najadeite O and Si are detected in the white jadeite, which are the main elements of the jadeite. Green jadeite not only detects the elements of Na _ (Al) O and Si, but also detects the difference of the relative contents of Cr and mg, Fe and Ca, which will lead to the change of the color of the jade. (3) the analysis of UV-Vis absorption spectrum shows that the relative content of Cr and mg ~ (2 +) Fe ~ (2 +) is different from that of mg ~ (2 +) Fe ~ (2 +). The absorption peaks of Cr _ 3 in green jadeite and white jadeite appear obviously in the position of 437nm, and the absorption peaks of Cr _ 3 in green jadeite and white jadeite are obvious. The results show that green is caused by the presence of Cr elements. (4) the reflectivity curve of green jadeite jade is relatively smooth and the reflectivity is mostly between 10% and 20%, and the reflection peak is located at the position of 500nm or so. The reflectance curve of green jade samples from light to thick is mainly characterized by sharp reflection peaks and most of them are located in the position of 530nm, and the reflectivity is mostly between 10% and 30%. (5) the tone angle of green jadeite jade is (1950210 掳), and the main wavelength is in the range of 491nm~493nm. The tone is blue-green; the tonal angle is (180 掳/ 195 掳), the main wavelength is within the range of 493nm~497nm and the tone is pan-blue green; the hue angle is (165 掳/ 180 掳), the main wavelength is within the range of 497nm~509nm and the tone is green; and the hue angle is (150 掳/ 1650) and the main wavelength is within the range of 509nm~538nm, The tone is yellowish green. The tonal angle is (1350,1500), the main wavelength is in the range of 539nm~553nm, and the tone is yellowish green.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.28

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