Abstract
Glassy carbon preheated at 2000°C was exposed under 90 kb and 65 kb at high temperatures in order to elucidate the processes of the graphitization and the formation of diamond from the carbon with the characteristic bond nature under high pressure and temperature conditions. In the present work, the process of the diamond formation as the stable phase was followed by the X-ray diffraction method and the scanning electron microscopic observation. The diamond well developed with the {111} face was found to form on a graphite grain, which had been grown as a meta-stable phase under high pressures and temperatures.
