Geoscience Reference
In-Depth Information
HPHT SSS
LPSSS-metal
CVD
Pressure
>60 kbar
Pressure
<1 atm
H°
Pressure
<1 atm
H
C vapor + H°
Vapor
Solid
carbon
source
Solid
carbon
source
Starting
assemblage
Substrate “scratched”
for nucleation
.........................
...
Metallic
catalyst
Specific
solid nuclei
800-1200°C
400-1000°C
400-1000°C
Diamonds
form from
metallic liquid
Diamonds
form from
metallic
liquid + vapor
Diamonds
form from
vapor
During
reaction
Parent
C
x
Me
y
(H
z
)
alloy
Substrate
Figure 9.1 Schematic diagram comparing three popular methods of diamond synthesis
processes
[28]
.
P
(kb)
700
600
Liquid
500
Diamond
400
300
200
100
0
1000
2000
3000
4000
5000
T
(K)
