Abstract
The synthesis of diamond using new non-metallic catalysts is briefly reviewed based on our recent work. It is clear from our studies that diamond can be reproducibly synthesized at 7.7 GPa and 2150°C from graphite in the presence of 11 non-metallic catalysts such as MgCO 3, Mg(OH) 2, MgSO 4 and Na 2SO 4. The morphology of diamond crystals was strongly dependent on the nature of the catalysts. The diamond-producing region in the graphite-Na 2SO 4 system was determined under the conditions 6.5–7.7 GPa and 1600–2200°C. At a higher pressure of 7.7 GPa, diamond could be synthesized even at temperatures of 1700°C, but diamond was synthesized at 2000°C at a pressure of only 7 GPa. Also, the morphology of diamond crystals was strongly dependent on the synthesizing temperature. Diamond crystals grown from the graphite-Na 2SO 4 system changed from a cubic shape to an octahedral shape with increasing temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
