High-pressure synthesis of diamond from graphite and Fe2SiO4
1999 Volume 75 Issue 3 Pages 43-45
Details
1999 Volume 75 Issue 3 Pages 43-45
A mixture of graphite and Fe2SiO4 in a ratio 2:3 by weight has been studied under pressures from 6 to 10GPa and temperatures between 1000 and 1960°C using an octahedral-anvil apparatus. At 8GPa, diamond with a size -10μm across was found to be formed at temperatures higher than 1900°C. This threshold temperature is by 150°C higher than the melting temperature of Fe2SiO4 at this pressure. The result offers a clue to the genesis of diamond in the deep interior of the earth.
