METHOD OF GROWING DIAMOND FROM GRAPHITE

摘要

FIELD: artificial diamond. SUBSTANCE: diamond is grown from graphite in high-pressure chamber using pulse-periodical laser emission directed on diamond-graphite boundary through one of laser emission-transparent walls of chamber. In the diamond anvil-type chamber, pressure from about 5 to about 50 GPa is maintained (depending on chamber capacity), and laser emission pulse heats very narrow skin-layer of graphite to temperatures of order of 1000 K which is sufficient to convert graphite into diamond. Because of great temperature gradients in skin-layer and high heat conductivity of diamond, abnormally fast cooling of layer and its conversion into laser emission-transparent diamond occurs. Wavelength of laser emission should fall within diamond transparency region from about 0.2 to about 5 mcm. Next laser pulse heats next graphite layer and converts it into diamond. Thus laser emission stimulates proliferation of transparent diamond into non-transparent graphite. EFFECT: intensified process.