Analysis on Gemmological Characteristics and Ultraviolet-Visible Spectrum of Synthetic Alexandrite
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摘要: 运用紫外-可见光吸收光谱等测试方法对合成变石样品的颜色特征进行了分析, 初步研究了合成变石的致色元素及其质量分数对变色效应的影响。分析结果表明:合成变石常见的紫色调现象与吸收光谱中紫区未被完全吸收有关, 通过添加少量有利于紫区吸收的致色元素, 有望减弱合成变石的紫色调;随着V元素的增加, 橙黄区吸收带的分布趋于合理, 使红光与绿光的透过更趋平衡, 有利于产生较理想的变色效应;合成变石的紫外-可见光吸收光谱与其结晶学方向有密切关系, (001) 方向的吸收光谱在橙黄区有强吸收带, 具有明显的变色效应特征, (100) 和 (010) 方向虽有强二色性, 但对变色效应贡献不大。
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关键词:
- 合成变石 /
- 紫外-可见光吸收光谱 /
- 变色效应
Abstract: The colour characteristic of synthetic alexandrite samples are analysed by the ultraviolet-visible spectral analysis. The influence on colour change effect by the colouring elements and their contents are primarily studied. The results indicate that the common violet tone of synthetic alexandrite is related to the incomplete absorption of absorption spectrum in the violet region, which could be weaken by joining a few colouring elements that redound to absorption from the violet region.The absorption band in the orange-yellow region could distribute rationally by increasing the vanadium element which balances the permeation of light between the red region and green region for perfect colour change effect. The UV-VIS spectrum of synthetic alexandrite has the great relationship with the crystallography direction. The absorption spectrum of sample in the direction of (001) has a strong absorption band in the orange-yellow region where the sample has the obvious characteristics of colour change effect.In the directions of (100) and (010), the sample has strong dichroism, but the colour change effect is not obvious.-
Keywords:
- synthetic alexandrite /
- UV-VIS Spectrum /
- colour change effect
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[1] 曾广策.简明光性矿物学[M].武汉:中国地质大学出版社, 1998. [2] 周名成, 俞汝勤.紫外与可见分光光度分析法[M].北京:化学工业出版社, 1986. [3] 罗红宇, 彭明生, 黄宇营, 等.金绿宝石和变石中的微量元素研究[J].矿物学报, 2006, 26(1): 77-83. [4] 罗红宇, 彭明生, 廖尚宜, 等.金绿宝石和变石的呈色机理[J].现代地质, 2005, 19(3): 356-360. [5] 李立平, 业冬.铬和钒在宝石变色效应中的作用[J].宝石和宝石学杂志, 2003, 5(4): 17-21.
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