Yang Zhi-Jun, Peng Ming-Sheng, Meng Yu-Fei, Yuan Zhi-Zhong, Su Yu-Wei, Li Hong-Zhong
Department of Geoscience, Sun Yat-sen University, Guangzhou 510275, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2007 Jun;27(6):1066-70.
From the center to the rim of natural diamond there are differences in nitrogen and C-H bond contents, suggesting that diamond was formed under varying substance conditions. Both the nitrogen and C-H bond contents tend to decrease from the center to the rim as a whole, indicaing that nitrogen and hydrogen are expended little by little during the formation of diamond. But in the middle area of the sample both the nitrogen and C-H bond contents have a tendency to increase. This implies that nitrogen and hydrogen are added into the environment of diamond formation, meanwhile nitrogen is added earlier. So the procedure of diamond formation may be divided into three stages, namely nucleation and growth in the early stage, growth in the middle stage and in the late stage. In the early and late stages nitrogen and hydrogen are consumed in the environment of diamond formation. In the middle stage nitrogen and hydrogen must be replenished for the growth of diamond, and nitrogen should be replenished earlier than hydrogen. Hydrogen is useful to the nucleation and growth of diamond. During the formation of diamond the compounds of nitrogen and hydrogen do not exist. So we must avoid the formation of compounds of nitrogen and hydrogen for the nucleation and growth of diamond if we plan to introduce hydrogen to the synthesis of diamond at high temperature and high pressure (HPHT). Implanted hydrogen in graphite for the HPHT synthesis of diamond is a good choice.
从天然钻石的中心到边缘，氮和碳氢键含量存在差异，这表明钻石是在不同的物质条件下形成的。总体而言，从中心到边缘，氮和碳氢键含量都呈下降趋势，这表明在钻石形成过程中，氮和氢在逐渐消耗。但在样品的中间区域，氮和碳氢键含量都有增加的趋势。这意味着氮和氢被添加到钻石形成的环境中，同时氮添加得更早。因此，钻石的形成过程可分为三个阶段，即早期的成核和生长阶段、中期的生长阶段以及后期。在早期和后期，氮和氢在钻石形成环境中被消耗。在中期，必须补充氮和氢以促进钻石生长，且氮的补充要早于氢。氢对钻石的成核和生长有益。在钻石形成过程中，不存在氮和氢的化合物。所以，如果我们计划在高温高压（HPHT）合成钻石时引入氢，就必须避免形成氮和氢的化合物以利于钻石的成核和生长。在石墨中注入氢用于HPHT合成钻石是个不错的选择。
