科研之友
微信
新浪微博
Facebook
分享链接
摘要
A systematic comparative study on the natural diamond ,the natural diamond treated by heat or irradiation and syn‐thetic diamond prepared by chemical vapor deposition (CVD) or High temperature and high pressure (HTHP) were carried out by UV‐Vis‐NIR absorption and FTIR spectra .The results showed that :natural diamond ,treated natural samples such as irradi‐ated or annealed ones under high temperature and the HT HP synthetic diamond ,the reflection coefficient is obviously variation between 200 nm and 1100 nm in UV‐Vis‐NIR spectra of above samples .In contrast ,the reflection coefficient of CVD synthetic diamond is relatively smaller than the former .Infrared spectra showed that synthetic diamonds ,especially for CVD synthetic dia‐monds have no obvious absorption peak between 800 and 1 600 cm-1 .In additional ,the results of DiamondViewTM detection are different for different kinds of diamonds .Generally speaking ,some CVD synthetic diamonds treated by HTHP appears some parallel dislocation lines ,and show light‐blue fluorescence .HPHT synthetic diamonds exhibit strong blocky geometrical shapes whereas some natural diamonds exhibit more tree‐ring type fluorescence patterns ,the color of diamonds’ fluorescence image may change after treated by HT HP or irradiation .In a word ,in view of the diversity and innovation of the synthesis technologies for diamond ,the natural and synthetic diamonds have some similar spectra characteristic in term of UV‐Vis‐NIR and FTIR spectra , some special natural diamonds without typical spectra characteristic of natural ones need to be further supplemented with Dia‐mondViewTM ,photoluminescence spectra and other instruments .
-
单位浙江省质量检测科学研究院; 浙江大学
