奇特的棕色钻石中不寻常的光学中心

A. Dorofeeva, S. Titkov
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引用次数: 0

摘要

背景。天然棕色钻石配以绚丽的黄色、橙色、红色和绿色,是珍贵的珠宝原料。它们的颜色与从地幔到地球表面的运输过程中发生的结晶后塑性变形有关。利用光学和红外光谱技术研究塑性变形金刚石中的点缺陷。材料和方法。对俄罗斯市场上呈现的具有奇特色彩的棕色钻石进行了光谱研究。采用紫外-可见吸收光谱和红外光谱对所选样品进行了检测。我们在紫外可见区的吸收光谱中发现了不寻常的光学中心。此外,还发现了从红色到紫外的连续吸收增加,以及N3和H3氮中心和550 nm的波段。在黄褐色钻石的光谱中,发现了512.9 nm和519.9 nm的波段,并伴有最大480 nm的宽频带。黄色晶体的出现与这些光学中心有关。在橙棕色金刚石样品的光谱中分别建立了506.5 nm、516.1 nm和679.7 nm波段。在绿棕色钻石样品中观察到与单氮原子和中心(NV)相关的附加吸收连续体。它们同时存在会使钻石的颜色呈现绿色。利用红外光谱获得的信息表明,根据钻石的物理分类,不仅在最常见的Ia型晶体中可以出现强烈的棕色,而且在相对罕见的Ib + IaA型钻石中也可以出现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unusual optical centres in fancy brown diamonds
Background. Natural brown diamonds with fancy yellow, orange, red and green tints are valuable jewelry raw materials. Their colour is associated with post-crystallisation plastic deformation occurring during transportation from the mantle to the Earth’s surface.Aim. To study point defects in plastically deformed diamonds using optical and IR spectroscopy.Materials and methods. Faceted brown diamonds with fancy tints presented on the Russian market were studied spectroscopically. Selected samples were examined using UV-visible optical absorption spectroscopy and IR spectroscopy.Results. We discovered unusual optical centres in the absorption spectra of the UV-visible region. In addition, the known continuous absorption increasing from the red to the ultraviolet region of the spectrum, as well as the N3 and H3 nitrogen centres and a band at 550 nm, were revealed. In the spectra of yellowish-brown diamonds, the bands at 512.9 nm and 519.9 nm and an accompanying broad band with a maximum of 480 nm were found. The appearance of a yellowish tint of crystals was associated with these optical centres. The bands 506.5 nm, 516.1 nm and 679.7 nm were established in the spectrum of orange-brown diamond samples. An additional absorption continuum associated with single nitrogen atoms and centres (NV)– were observed in greenish-brown diamond samples. Their simultaneous presence causes the appearance of a greenish tint in the diamond colour.Conclusion. The information obtained using IR spectroscopy indicates that an intense brown colour can occur not only in the most common Ia type crystals according to the physical classification of diamonds, but also in relatively rare Ib + IaA type diamonds.
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