The manner which grows the diamond from the 70 under C

摘要

A method of growing single crystal diamonds in excess of 10 mu m in diameter from industrial diamond "seeds" having mean diameters of approximately 1.5 mu m is disclosed. The diamonds are grown by exposing the seed diamonds to C70 in the presence of elemental reducing agents such as phosphorus or selenium in evacuated cells at moderate temperatures and pressures. In another aspect the invention diamonds are grown by exposing diamond seed particles to vapour phase C70 in the presence of a gas phase metal carbonyl, such as F5e(CO) in a temperature range of 400 DEG C. to 700 DEG C. to cause at least some of the diamond seed particles to grow.