拉曼光谱技术在仿古玉鉴别中的应用

Application of Raman spectrometry in the authentication of forged archaic nephrite

由热处理法可制得软玉的仿古效果,为古玉的科学鉴定提供理论依据,为此使用拉曼光谱对三组不同颜色的软玉原料及经不同温度热处理所得的样品进行了研究。实验结果表明:经热处理法得到的仿古玉样品的拉曼谱图同未经热处理的软玉原料的拉曼谱图相比在位移上有显著差异。未经热处理的软玉原料在252～395cm^(-1)拉曼位移带的数个谱峰在经热处理得到的仿古玉的谱图中会集中显示为324～327cm^(-1)和389～395cm^(-1)处的两个拉曼峰,在666～668cm^(-1)和1019～1027cm^(-1)处的谱峰会稍向低频方向漂移至662～665cm^(-1)和1007～1010cm^(-1), 510～526cm^(-1)处的拉曼峰会变钝,926cm^(-1)处的谱峰几乎消失,而1304～1310cm^(-1)处的拉曼峰则是经热处理法得到的仿古玉才具有的。因此,1304～1310cm^(-1)处的拉曼峰可作为鉴别经热处理法得到的仿古玉的特征峰。

Three groups of nephrite of different colors at special temperature were heat - treated, and good forged effects of archaic jades were obtained. Then their Raman spectra were tested. The results of the tests showed that the Raman spectra for the forgeries were significantly different from those for unheated nephrite. In the Raman spectra for the forgeries, the three of four Raman peaks between 252cm^-1 and 395cm^-1 were changed into two peaks, one of which was between 324cm^-1 and 327cm^-1 and the other was between 389cm^-1 and 395cm^-1. The peaks between 666cm^-1 and 668cm^-1 and between 1019cm^-1 and 1027cm^-1 were shown in a little lower shifts between 662 - 665cm^-1 and 1007 - 1010cm^-1 respectively. The peak between 510cm^-1 and 526cm^-1 was changed obtusely. The peak at 926cm^-1 almost disappeared.And the peak between 1304cm^-1 and 1310cm^-1 was oboserved only in those Raman spectra for the forgeries, which resulted from heattreatment.