A New Concept on the Structure of the Catalyst in Diamond Synthesis

The circular sheet catalyst has been found useful for both six anvil and two anvil high pressure devices. But the single-output of the latter is about 50% higher than the former for the same chamber dimentions. In this paper, we analyzed the catalyst's surface characteristic and the relationship between the applied load and the strain of the catalyst assembly evaluated the function in the variation of the specific surface area as well as the shape of the catalyst. We conclude that the increase in contact area, or reaction area, between the catalyst and graphite is important for the enhancement of convention ratio of single-crystal fine diamond. To this end, the new concept of foam catalyst has been presented.