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首页> 外文期刊>Contributions to Mineralogy and Petrology >Radio-colouration of diamond: a spectroscopic study
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Radio-colouration of diamond: a spectroscopic study

机译：钻石的放射性着色：光谱研究

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We have undertaken a study of the common green or orange-brown spots at the surface of rough diamond specimens, which are caused by alpha particles emanating from radioactive sources outside the diamond. Richly coloured haloes represent elevated levels of structural damage, indicated by strong broadening of the main Raman band of diamond, intense strain birefringence, and up-doming of spots due to their extensive volume expansion. Green radio-colouration was analogously generated through the irradiation of diamond with 8.8 MeV helium ions. The generation of readily visible radio-colouration was observed after irradiating diamond with >10~(15) He ions per cm~2. The accumulation of such a high number of alpha particles requires irradiation of the diamond from a radioactive source over long periods of time, presumably hundreds of millions of years in many cases. In the samples irradiated with He ions, amorphisation was observed in volume areas where the defect density exceeded 5 x 10~(-3) A~(-3) (or 0.03 dpa; displacements per target atom). In contrast, graphitisation as a direct result of the ion irradiation was not observed. The green colouration transformed to brown at moderate annealing temperatures (here 450 °C). The colour transformation is associated with only partial recovery of the radiation damage. The colour change is mainly due to the destruction of the GR1 centre, explained by trapping of vacancies at A defects to form the H3 centre. An activation energy of ~2.4 ± 0.2 eV was
机译：我们已经对钻石毛坯样品表面常见的绿色或橙棕色斑点进行了研究，这些斑点是由钻石外部放射源发出的α粒子引起的。色彩丰富的光环代表结构损伤的升高水平，这表明钻石的主要拉曼光谱带强烈展宽，强烈的应变双折射和由于其大量的体积扩张而引起的斑点隆起。类似地，通过用8.8 MeV氦离子照射钻石，产生了绿色的放射色。用每平方厘米2的> 10〜（15）He离子辐照钻石后，观察到易于观察到的放射色的产生。如此大量的α粒子的积累需要长时间从放射源对钻石进行辐照，在许多情况下可能长达数亿年。在He离子辐照的样品中，在缺陷密度超过5 x 10〜（-3）A〜（-3）（或0.03 dpa;每个目标原子的位移）的体积区域中观察到非晶化。相反，未观察到石墨化是离子辐射的直接结果。在适当的退火温度（此处为450°C）下，绿色变为棕色。颜色转换仅与辐射损伤的部分恢复有关。颜色变化主要归因于GR1中心的破坏，这可以通过在A缺陷处捕获空位以形成H3中心来解释。的活化能为〜2.4±0.2 eV

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