Causes of Colour in Untreated, Heat Treated and Diffusion Treated Orange and Pinkish Orange Sapphires
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摘要: 总结了未处理、热处理和Be扩散处理的黄色—红色蓝宝石的颜色及其成因。综述了蓝宝石色心的主要类型。对热不稳定的黄色和橙色色心的性质与高温热处理或由Be扩散处理产生的热稳定橙色色心的特征进行了对比研究。对橙色色心形成的一些模式进行了详细描述和讨论, 这些模式是由 Häger (2001) 和 Emmett等 (2003) 提出、根据样品中微量元素含量建立的。两个模式都是基于微量元素 Mg—Fe—Ti和 (Be+Mg) —Fe—Ti三角图解建立的。对来自斯里兰卡的未处理和热处理帕帕拉恰蓝宝石的颜色成因与来自马达加斯加 Ilakaka和坦桑尼亚Songea的Be扩散处理蓝宝石的颜色成因进行了对比。处理与未处理蓝宝石颜色的巨大差异是由样品中的Fe和V的含量差异以及色心的丰度造成的。Abstract: Colour and causes of colour in untreated, heat treated and beryllium diffusion treated sapphires in the yellow to red colour range are summarized. An overview about the major types of colour centres in sapphire is given. Properties of thermally instable "yellow" and "orange" colour centres are compared with characteristic features of thermally stable "orange" colour centres which are produced by high temperature heat treatment or by beryllium diffusion treatment. The models for understanding the formation of orange colour centres according to trace element contents of the samples as suggested by Häger (2001) and Emmett et al (2003) are described and discussed in detail. Both models are based on trace element ratios in the Mg—Fe—Ti and in the (Be+Mg) —Fe—Ti triangular diagram. The causes of colour of untreated and heat treated padparadscha from Sri Lanka are compared with the colouration of beryllium diffusion treated samples from Ilakaka, Madagascar, and from Songea, Tanzania. The great colour variability of untreated and treated samples is due to the large variation of iron and chromium contents of the samples as well as to the concentration of colour centres.
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Keywords:
- sapphire /
- heat treatment /
- diffusion treatment /
- untreated /
- cause of colour
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