阴极发光和红外光谱技术在金刚石研究中的应用

APPLICATION OF CATHODOLUMINESCENCE AND FTIR ANALYSIS IN DIAMOND STUDIES

总结了阴极发光（ＣＬ）及傅立叶变换红外光谱（ＦＴＩＲ）技术在金刚石研究中的应用。ＣＬ图像可以揭示金刚石的内部结构、生长机制、生长阶段及过程，提供塑性变形及是否含有ＣＯ２的信息，验证和解释微区ＦＴＩＲ分析、稳定同位素及地质年代研究的结果，为天然金刚石和合成金刚石的区分提供关键证据。合成金刚石的实验研究表明，氮的不同聚集态丰度值是聚集温度ＴＮＡ、金刚石存留时间ｔＭＲ及氮丰度值的函数，利用地质信息和ＦＴＩＲ分析获得的氮不同聚集态的丰度可以计算金刚石的ＴＮＡ和ｔＭＲ，讨论金刚石生长的热演化历史。

The application of cathodoluminescence (CL) technique and Fourier transform infrared (FTIR) analysis in diamond studies are summarized in this paper.CL diagrams show:①internal structures,growth mechanism,growth stages and processes of diamonds;②the information about plastic deformation and CO 2 bearing diamonds.They can elucidate the conclusions gained by FTIR microarea analyses and nitrogen,carbon stable isotope analyses.Also,the CL technique is the key method to identify natural diamonds and synthetic diamonds in geology.FTIR microarea analysis can give the characteristics of the varieties of H and N contents,N aggregation states,diamond types form inner core to outer rim of diamond plates.The experimental studies about synthetic diamonds suggested that the extent of conversion of A defects to the aggregated B form is a function of the nitrogen aggregation temperature ( T NA ),mantle residence time ( t MR ),and N concentration of diamond.The T NA and t MR can be calculated by using the FTIR curves and some geological data.The thermal history and age of the growth of diamonds can be inferred.All of the aspects above provide the significant information about the growth conditions,environment,genesis and source of diamonds.