摘要
The effect of the catalyst height on the morphology of diamond crystal is investigated by means of temperature gradient growth(TGG) under high pressure and high temperature(HPHT) conditions with using a Ni-based catalyst in this article. The experimental results show that the morphology of diamond changes from an octahedral shape to a cuboctahedral shape as the catalyst height rises. Moreover, the finite element method(FEM) is used to simulate the temperature field of the melted catalyst/solvent. The results show that the temperature at the location of the seed diamond continues to decrease with the increase of catalyst height, which is conducive to changing the morphology of diamond. This work provides a new way to change the diamond crystal morphology.
The effect of the catalyst height on the morphology of diamond crystal is investigated by means of temperature gradient growth （TGG） under high pressure and high temperature （HPHT） conditions with using a Ni-based catalyst in this article. The experimental results show that the morphology of diamond changes from an octahedral shape to a cub- octahedral shape as the catalyst height rises. Moreover, the finite element method （FEM） is used to simulate the temperature field of the melted catalyst/solvent. The results show that the temperature at the location of the seed diamond continues to decrease with the increase of catalyst height, which is conducive to changing the morphology of diamond. This work provides a new way to change the diamond crystal morphology.
基金
supported by the National Natural Science Foundation of China(Grant No.51172089)
the Program for New Century Excellent Talents in University,the Natural Science Foundation of Guizhou Provincial Education Department(Grant No.KY[2013]183)
the Collaborative Fund of Science and Technology Office of Guizhou Province,China(Grant No.LH[2015]7232)
