RAMAN SPECTROSCOPY OF IMPACT POPIGAI ASTROBLEME DIAMONDS HEAT TREATED AT 5.5 GPa

Experimental data are presented on the Raman spectra and surface graphitization of impact diamonds of Popigai astrobleme that were heat-treated at 5.5 GPa in a wide temperature range (1500–2250^o C). It has been established that light-colored (without inclusions of graphite) impact diamonds are extremely resistant to thermobaric action. Bulk graphitization of diamonds is not recorded up to 2250^o C at 5.5 GPa. Dark-colored diamonds (with inclusions of graphite) turned out to be less resistant to high temperatures. Their complete graphitization was achieved at temperatures above 2000^o C. Owing to the extreme resistance of impact diamonds of Popigai astrobleme to thermobaric eff ect, they can be widely used in the manufacture and use of diamond tools.
   
Author:  A. I. Chepurov, S. V. Goryainov, E. I. Zhimulev, V. M. Sonin, A. A. Chepurov, Z. A. Karpovich, V. P. Afanas'ev, N. P. Pokhilenko
Keywords:  diamond, graphitization, high temperatures and pressures, Raman spectroscopy
Page:  1697