Gemmological Characteristics of GE Synthetic Jadeite Jade
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摘要: 采用傅立叶变换红外光谱仪、激光拉曼光谱仪、电子探针、阴极发光显微镜等分析测试仪器,对美国通用电气公司(GE)合成宝石级翡翠的化学成分、振动光谱、吸收光谱及阴极发光等特征进行了研究。结果表明,GE合成翡翠的主要化学成分为w(SiO2)=59.74%~61.72%,w(Al2O3)=23.90%~24.97%,w(Na2O)=13.65%~14.85%以及微量的w(Cr2O3)=0.05%0.07%,w(K2O)=0.02%~0.04%,w(CaO)=0.02%0.06%。在3 400~3 700 cm-1范围内,GE合成翡翠显示一组(3 373,3 471,3 614 cm-1)与天然翡翠截然不同的且由羟基伸缩振动所致的红外吸收谱带。在376,700,989,1 039 cm-1处出现的拉曼锐谱峰与天然翡翠的拉曼光谱特征基本相同,表征GE合成翡翠具典型的硅氧四面体链状结构,且结晶程度较高。GE合成翡翠主要由Cr3+致色,在可见光区域内,由其4A2→4T2和4A2→4T1能级间跃迁而产生630,445 nm的吸收。Abstract: By using Fourier transform infrared spectroscopy,laser Raman spectroscopy,electron microprobe and cathodoluminescence microscope,the chemical compositions,vibrational spectrum,absorption spectrum and cathodoluminescence of the latest developed synthetic jadeite jade synthesized by American General Electric Corporation(GE) are investigated.The results show that GE synthetic jadeite jade consists primarily of w(SiO2)=59.74%~61.72%,w(Al2O3)=23.90%~24.97%,w(Na2O)=13.65%~(14.85)% and secondarily of w(Cr2O3)=0.05%~0.07%,w(K2O)=0.02%~0.04%,w(CaO)=0.02%~0.06%.The IR absorption bands of 3 373,3 471 and 3 614 cm-1 are resulted from the hydroxyl stretching vibration in GE synthetic jadeite jade.A group of sharp laser Raman spectral peaks of 376,700,989,1 039 cm-1 indicate that GE synthetic jadeite jade has silicon-oxygen tetrahedron chain structure and crystal perfection.The colouration of GE synthetic jadeite jade is attributed mainly to the absorption at 445 and 630 nm,which is resulted from the transition of 4A2→ 4T2and 4A2→ 4T1in Cr3+.
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