使用X射线衍射仪(XRD)、紫外-可见吸收光谱仪(UV-VIS)、拉曼光谱仪,对进行氧化气氛热处理前后的紫色翡翠样品进行光谱测试。XRD分析结果显示,紫色翡翠样品中95%以上是硬玉成分。热处理前后的紫外-可见吸收光谱对比结果显示,样品热处理后的光谱和热处理前相比,437 nm处尖峰以及580 nm处吸收包基本消失;而拉曼光谱图对比结果显示,热处理后黄褐色部位拉曼峰值基线整体呈上升趋势。分析结果表明,紫色翡翠样品主要致色离子为Fe²⁺,在经过热处理后,Fe²⁺氧化成为Fe³⁺,生成Fe₂O₃,从而致使热处理后的紫色翡翠样品呈现出黄褐色。

Purple jade sample was tested before and after heat treatment under oxidational atmosphere with X-ray diffractometer(XRD),ultraviolet visible (UV-VIS) absorption spectrosmeter and Raman spectrometer. XRD analysis results show that the major components of the sample are jadeite. The sample UV-VIS absorption spectra before and after heat treatment shows that after heat treatment the spikes at 437 nm and 580 nm almost disappear,while Raman spectra of purple jade brown section after heat treatment shows that the baseline presents rising trend. According to the above analysis,the following conclusion is drawn:the main color-causing ion is Fe²⁺,while Fe²⁺ changes to Fe³⁺after heat treatment and Fe₂O₃ is formed. Therefore the sample of purple jade shows brown after the heat treatment.