摘要
本文以国产JHY-Ⅲ型六面顶压机为合成设备,以Ni70Mn25Co5粉末触媒作为合成触媒,高纯鳞片石墨粉末做碳源,在合成压力4.6GPa到5.3GPa之间,合成温度1100℃到1200℃之间,合成时间300s的条件下合成金刚石样品。结果表明样品中随着硼含量的增加,金刚石的最低成核压力先降低,当添加0.75%时降至最低,然后随着硼含量的增加最低成核压力又开始升高;同时考察了不同压力、温度值对金刚石样品的影响规律,结果表明在相同的B掺杂比下随着合成压力的提高,合成腔体内金刚石的成核数增加,但晶形完整率下降,并且合成压力对含硼金刚石的颜色影响不大而合成温度是影响晶体中硼含量的主要因素。最后本文还考察了合成金刚石中包裹体的分布规律,证明了硼杂质进入金刚石时可能有着明显的生长区域的选择性这一重要规律。
Diamond single crystals were synthesized by Ni70Mn25Co5 power catalyst with B added on the JHY-Ⅲ type cubic apparatus.We researched the influence of B to the synthesis of diamond by Ni70Mn25Co5 power catalyst under HPHT（from 4.6Gpa to 5.3GPa,1100-1200℃）.The time for diamond synthesized was about 300s.The result showed that diamond nucleation-pressure decreased firstly with the ratio of B added in,and the lowest nucleation-pressure was discovered at the ratio of 0.75% added,then,the nucleation-pressure for diamond synthesized increased with the ratio up further.We also studied how the pressure and the temperature effect for diamond synthesized.The results showed that nucleationrate increased with the pressure grow higher under the same ratio of B added.At the same time,the surface of diamond synthesized get coarser and coarser.At last,we studied the regularities of distribution of inclusion in diamond and proved that the selectivity was obviously when the B doped into diamond and the primary influencing factor was the temperature.
关键词
金刚石
成核
高温高压
diamond
nucleation
high temperature and high pressure（HPHT）
