翡翠成分、结构和矿物组成的无损分析

摘要

利用便携式能量色散型X射线荧光(portable energy-dispersive X-ray fluorescence,PXRF)、外束质子激发X射线(external beam proton induced X-ray emission,PIXE)、X射线衍射(X-ray diffraction,XRD)和激光拉曼光谱(laser Raman spectroscopy,LRS)对12块样品进行了成分、结构和矿物组成分析.结果表明,PXRF和PIXE的分析结果有较好的可比性,样品主要由较纯的硬玉组成,次要元素含量较低.1块样品含少量绿辉石,一块样品主要由绿辉石组成.硬玉的Raman特征峰位于201,372,698,985,1 037 cm-1,绿辉石的特征峰位于680和1 017cm-1.利用Raman光谱测试样品的裂隙处,发现3块样品含白蜡,1块样品含环氧树脂.白蜡的Raman特征峰位于2 846和2 880 cm1,环氧树脂的特征峰位于2 924和3 065 cm-1.无损分析技术在翡翠中的应用拓展了样品的研究范围,为翡翠的进一步研究、鉴定和分级提供了技术支持.%The techniques of portable energy-dispersive X-ray fluorescence analysis (PXRF), proton induced X-ray emission (PIXE), X-ray diffraction (XRD) and laser Raman spectroscopy (LRS) were employed to analyze the chemical composition,structure and mineral constitution of 12 samples. The results indicated that the chemical compositions determined by PXRF and PIXE are well comparable and most samples are constituted by almost pure jadeite with low concentration of secondary elements. One sample contains a little omphacite and one sample is composed only by omphacite. Raman characteristic peaks of jadeite occurred at 201, 372, 698, 985 and 1 037 cm-1, while those of omphacite located at 680 and 1 017 cm-1. By using laser Raman spectroscopy for testing the fissures of the samples, wax in 3 samples and epoxy resin in one sample were found. Raman characteristic peaks of wax located at 2 846 and 2 880 cm-1 and those of epoxy resin occurred at 2 924 and 3 065 cm-1. The application of nondestructive techniques in jadeite jade broadens the range of samples for future study and provides technical support for jadeite jade's further study, identification and classification.