EFFECT OF THE BUOYANCY FORCE ON DIAMOND FORMATION DURING SYNTHESIS UNDER A HIGH-PRESSURE

Abstract

In diamond synthesis, the effect of the buoyancy force has been observed. As diamond particles grow, some of the diamonds formed on the bottom surface of each layer float up through the liquid solvent to the top surface owing to the difference between the specific gravities of the diamond and liquid solvent. This makes a difference between the numbers and sizes of the diamond particles formed on the top and the bottom surfaces of each solvent layer. Additionally it is seen that the temperature gradient in the specimen affects their formation only at the beginning of synthesis.