The Synthesis from α-SiO2 and Graphite System to Coesite under High Temperature High Pressure

Abstract

Taking α-quartz of different mass ratio mixed with graphite powder mixture as the initial materials, using the method of combining high-energy mechanical milling with high pressure and high temperature , this work inspected the influences of carbon content on the synthesis conditions of coesite. The experimental products were measured by XRD, TEM, and Raman. The results showed that the existence of carbon can obviously inhibit the formation of coesite, and the higher carbon content of initial materials the higher pressure on forming coesite is needed.