Effects of a carbon convection field on large diamond growth under high-pressure high-temperature conditions  

作　　者：胡美华 李尚升 马红安 宿太超 李小雷 胡强 贾晓鹏 

机构地区：[1]School of Materials Science and Engineering,Henan Polytechnic University [2]State Key Laboratory of Superhard Materials,Jilin University

出　　处：《Chinese Physics B》2012年第9期525-530,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 50572032, 50731006, and 50801030);the Young Scientists Fund of the National Natural Science Foundation of China (Grant Nos. 51001042 and 51002045)

摘　　要：Large diamond crystals were successfully synthesized by a FeNi C system using the temperature gradient method under high-pressure high-temperature conditions. The assembly of the growth cell was improved and the growth process of diamond was investigated. Effects of the symmetry of the carbon convection field around the growing diamond crystal were investigated systematically by adjusting the position of the seed crystal in the melted catalyst/solvent. The results indicate that the morphologies and metal inclusion distributions of the synthetic diamond crystals vary obviously in both symmetric and non-symmetric carbon convection fields with temperature. Moreover, the finite element method was applied to analyze the carbon convection mode of the melted catalyst/solvent around the diamond crystal. This work is helpful for understanding the growth mechanism of diamond.Large diamond crystals were successfully synthesized by a FeNi C system using the temperature gradient method under high-pressure high-temperature conditions. The assembly of the growth cell was improved and the growth process of diamond was investigated. Effects of the symmetry of the carbon convection field around the growing diamond crystal were investigated systematically by adjusting the position of the seed crystal in the melted catalyst/solvent. The results indicate that the morphologies and metal inclusion distributions of the synthetic diamond crystals vary obviously in both symmetric and non-symmetric carbon convection fields with temperature. Moreover, the finite element method was applied to analyze the carbon convection mode of the melted catalyst/solvent around the diamond crystal. This work is helpful for understanding the growth mechanism of diamond.

关 键 词：DIAMOND high pressure and high temperature temperature gradient method carbonconvection field 

分 类 号：O782[理学—晶体学] TN304.18[电子电信—物理电子学]