Ⅱa型宝石级金刚石大单晶研究最新进展  

Recent progress in the synthesis of typeⅡa gem class diamond single crystal

作　　者：李尚升[1] 臧传义[2] 马红安[1] 田宇[1] 张亚飞[1] 肖宏宇[1] 黄国锋[1] 马利秋[1] 李小雷[1,2] 贾晓鹏[1,2] 

机构地区：[1]吉林大学超硬材料国家重点实验室,吉林长春130012 [2]河南理工大学材料科学与工程学院,河南焦作454000

出　　处：《超硬材料工程》2007年第5期27-29,共3页Superhard Material Engineering

基　　金：国家自然科学基金项目(50572032)

摘　　要：用合金触媒利用温度梯度法合成优质Ⅱa型宝石级金刚石。研究发现,在约5.4GPa和约1300℃的条件下,除氮剂的加入使合成金刚石的温度区间变窄及金刚石晶体生长过程中更易俘获包裹体而出现熔坑,从而影响晶体的生长速度。实验解决了组装的稳定性问题;并通过调整组装,在除氮剂合适的掺入量下,使合成优质金刚石的最大生长速度达到2.16mg/h。结果实验获得了4.3mm的优质Ⅱa型金刚石大单晶。红外测试分析表明该金刚石含氮量小于10^(-7)。High quality Ⅱa gem class diamonds were synthesized by means of temperature gradient method with alloy catalyst. While the nitrogen getter is added at ～5.4GPa and 1300C the temperature range of the synthesized diamonds become narrow and the process of diamonds is likely to trap the metal inclusions and produce cavities in the crystals, then the effects of nitrogen getter on the growth rate of diamonds was obvious. In this paper the problem of the stable assembly was solved; at the same time, the growth rate of high quality diamond arrived at 2.16mg/h by adapting assembly at the appropriate quantity of nitrogen getter. The high quality Ⅱa gem diamonds of 4.3mm in size were synthesized. The nitrogen concentration in the diamond which was measured by FTIR （Fourier Transform Infrared） is less than 0. 1ppm.

关 键 词：Ⅱa型宝石级金刚石 合成 温度梯度法 除氮剂 

分 类 号：TQ164[化学工程—高温制品工业]