Abstract
In this paper an overview of the application of opposed anvil-type high-pressure and high-temperature apparatus for spontaneous growth of diamond crystals by solvent-catalyst technique is presented. The process makes use of a molten Mn47Ni53 catalyst to initiate the graphite–diamond transformation reaction. The pressure and temperature requirements to obtain reproducible spontaneous diamond crystallization were around 52.5–54kbar and 1270–1320°C. The crystals had well-shaped cubo-structured morphology with the {100} and {111} faces and grain sizes of 0.2–0.5mm. This work can stimulate future experimental exploration of spontaneous diamond crystallization by using other solvent-catalyst metals.
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