无色-近无色高温高压合成钻石的谱图特征及其鉴别方法

发布时间：2018-03-20 01:02

本文选题：高温高压合成钻石　切入点：天然钻石　出处：《岩矿测试》2016年05期 　论文类型：期刊论文

【摘要】：实验室发现大量小颗粒的无色高温高压(HPHT)合成钻石与天然钻石混杂镶嵌在各种饰品中,前人提出荧光和磷光特征是主要的快速区分特征,然而荧光、磷光特征的差异并不能完全将HPHT合成钻石与天然钻石区分开来。本文将常规的宝石学观察分析与多种高精度谱学测试相结合,对五粒不同的无色-近无色HPHT合成钻石样品进行深入研究。结果表明,五粒钻石在紫外可见吸收光谱无270 nm吸收或是只有极弱的270 nm吸收,随着颜色级别的降低,270 nm吸收越明显。红外光谱测试显示,各粒样品中都含有不等量的硼元素。光致发光光谱测试表明,HPHT合成钻石含有与微量N、Ni、Si等相关的晶格缺陷。超短波紫外光源激发下,所有的HPHT合成钻石都有强磷光,在钻石观察仪下可以观测到清晰的八面体和立方体分区特征。显然,不同的合成钻石的特征略有差异,但综合其荧光及磷光特征以及红外、紫外、光致发光光谱特征,可以准确地将无色HPHT合成钻石与对应的天然钻石区分开来。
[Abstract]:Laboratory found that a large number of small particles of colorless high-temperature and high-pressure synthetic diamonds and natural diamonds inlaid in a variety of jewelry, former people proposed that fluorescence and phosphorescence are the main characteristics of rapid discrimination, however, fluorescence, The difference of phosphorescence characteristics can not completely distinguish the HPHT synthetic diamond from the natural diamond. In this paper, the conventional Gemological observation and analysis are combined with a variety of high-precision spectroscopic measurements. Five different colorless and nearly colorless HPHT synthetic diamond samples were studied. The results showed that there was no 270nm absorption or very weak 270nm absorption in UV-Vis absorption spectra of five diamonds. With the decrease of color level, the absorption at 270 nm became more obvious. The results of photoluminescence spectroscopy show that the diamond has lattice defects related to the trace amount of Nu Ni Si and so on. All HPHT synthetic diamonds have strong phosphorescence under the excitation of ultrashort ultraviolet light source. Clear octahedron and cube features can be observed under the diamond observatory. Obviously, the characteristics of different synthetic diamonds are slightly different, but combined with their fluorescence and phosphorescence characteristics as well as infrared, ultraviolet and photoluminescence spectra, The colorless HPHT synthetic diamond can be accurately distinguished from the corresponding natural diamond.
【作者单位】：国家珠宝玉石质量监督检验中心;国土资源部珠宝玉石首饰管理中心;
【分类号】：TQ164.8;O657.3

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