Beryllium-Diffused Treatment Sapphire with Blue Body Colour
-
摘要: 针对近期市场上出现的一种体色呈蓝色或淡蓝色的Be扩散处理蓝宝石,采用EPMA,LA-ICP-MS、激光拉曼光谱仪、UV-NIS分光光度计等分析测试仪器,对50粒Be扩散处理蓝宝石样品的化学成分、拉曼光谱、UV-NIS吸收光谱特征进行了研究。测试与研究结果表明,这种Be扩散处理蓝宝石样品中,Be的质量分数最低为5.28×10-6%,最高为17.51×10-6%,平均为8.74×10-6%;其内普遍含有形态各异的斜锆石熔融或假象包裹体;由于Fe3+离子d-d电子跃迁,导致形成了样品的吸收光谱a带(377,386,451 nm)。在高温条件下,由Be扩散诱生的色心可能是导致蓝色蓝宝石呈色的主要缘由。
-
关键词:
- Be扩散处理蓝宝石 /
- UV-NIS吸收光谱 /
- LA-ICP-MS分析 /
- 呈色机制
Abstract: A type of beryllium-diffused treatment sapphire with blue or light blue body colour has recently appeared on gem markets.The chemical compositions,Raman spectrum and the characteristics of UV-NIS absorption spectrum of 50beryllium-diffused treatment sapphires samples are investigated by using EPMA,LA-ICP-MS,laser Raman spectrometer and micro-optical fibre spectrometer.The testing and research reasults show that the minimum mass percent of beryllium is5.28×10—6% and the maximum is17.51×10—6% and the average is8.74×10—6% in the beryllium-diffused treatment sapphire samples.Generally,the samples contain all forms of baddeleyite melting or pseudomorph inclusions.Because of d—d electron transition in the Fe3+ion,the absorption spectrum band a (377,386,451nm)of the samples is formed.With the high temperature,the beryllium-diffused and induced vacancy colour center may result in the blue colour of sapphire. -
-
[1] John L E,Kenneth S,Shane F M,etc.Beryllium diffusion of ruby and sapphire[J].Gems & Gemology,2003,39(2): 84-135.
[2] Karl S,Dietmar S.A microscopy-based screening system to identify natural and treated sapphires in the yellow to reddish-orange colour range[J].The Journal of Gemmology, 2005,29(7):257-264.
[3] Karl S,Dietmar S.The causes of colour in untreated,heat treated and diffusion treated orange and pinkish-orange sapphires——a review[J].The Journal of Gemmology,2004,29 (3):149-181.
[4] Visut P A,Tobias H.Yellow and brown coloration in beryllium-treated sapphires[J].The Journal of Gemmology,2004, 29(2):77-103.
[5] Shane M,Moses T,Koivula J I.A new corundum treatment from Thailand[EB/OL].http://www.GIA.GRE,2002-01-28.
[6] Themelis T.Beryllium-treated rubies & sapphires[EB/OL]. http://www.Themelis,2003.
[7] Rankin A Edwards.Some effects of extreme heat treatment on zircon coundum[J].The Journal of Gemmology,2002,28 (5):257-264.
[8] 亓利剑,曾春光.扩散处理合成蓝宝石的特征及其扩散机制[J].宝石和宝石学杂志,2006,8(3):4-9.
计量
- 文章访问数: 23
- HTML全文浏览量: 1
- PDF下载量: 6