关键词: 凝聚态物理学, 宝石级金刚石, 温度梯度法, 籽晶, 触媒

Abstract: lity gemgrade diamond crystal(>4 mm) was synthesized on {1 1 1} seed facets with NiMnCo as metal solvent using temperature gradient method (TGM) under high pressure and high temperature(HPHT), and compared with that grown on {1 0 0} facet. The results show that in the case of {1 0 0} , the morphology of crystal changes from lowtemperature sheet to hightemperature tower with increasing the synthesized temperature, whereas in the case of {1 1 1} the change trend is contrary to {1 0 0}. When {1 1 1} facet or {1 1 1} was used as the growth facet, the sheetlike crystal is more difficult to incorporated for the metal inclusion regardless of synthesized temperature. With NiMnCo metal as solvent, large highquality gemgrade diamonds can also grow on {1 1 1} facet with proper temperature gradient. Therefore, this method can be used to seek a cheaper metal solvent to replace expensive NiMnCo alloy for diamond synthesis.

Key words: condensed matter physics, gem diamond, temperature gradient method, seed, metal solvent