Diamond formation using Fe3C as a carbon source

1
Diamond formation using Fe3C as a carbon
source at high temperature and high pressure
Sim, Gyu Man
2
Introduction

• High-pressure synthesis using graphite as a
  carbon source in the presence of a metallic
• catalyst has been a standard method to obtain
  industrial diamond.
• Recently, diamond formation has been reported
  using non-metallic solvent catalyst
• such as CaCO3, Na2CO3 and graphite-Na2SO4.
• In this paper, a diamond synthesis experiment
  was carried out using only carbide as a
• carbon source at HPHT.

3
Experimental procedure
Fe3C with high purity was prepared under the
conditions of 3GPa and 1573? for about 22min in
the iron-graphite system.
Before the diamond synthesis experiment at HPHT,
the iron carbides were milled until they were
about 80-100meshes.
The iron carbides were put in a reaction
container.
A temperature of 1610K and a pressure of 5.3GPa
with time
4
Results and discussion
5
Results and discussion
10?
90?
6
Results and discussion
7
Results and discussion
8
Conclusion

• Diamond crystals were formed from iron carbide
  at HPHT.
• This work opens a new way to synthesize diamond
  at HPHT
• and provide direct evidence concerning diamond
  formation
• mechanism in the presence of transition metal
  catalyst using
• graphite as a carbon source at HPHT.