Spontaneous growth of diamond from MnNi solvent-catalyst using opposed anvil-type high-pressure apparatus

摘要

In this paper an overview of the application of opposed anvil-typehigh-pressure high-temperature apparatus for spontaneous growth of diamondcrystals by solvent-catalyst technique is presented. The process makes use of amolten Mn47Ni53 catalyst to initiate the graphite-diamond transformationreaction. The pressure and temperature requirements to obtain reproduciblespontaneous diamond crystallization were around 52.5-54 kbar and 1270-1320 C.The crystals had well-shaped cubo-structured morphology with the 100 and 111faces and grain sizes of 0.2-0.5 mm. This work can stimulate futureexperimental exploration of spontaneous diamond crystallization by using othersolvent-catalyst metals.