天然、Fe-C(H)系及Ni-C系高温高压合成金刚石的晶体形态、Raman光谱及PL谱研究结果表明:Fe-C(H)系高温高压合成金刚石多为类似于天然金刚石的八面体形态,Ni-C系高温高压合成金刚石的晶体形态多为六八面体;天然金刚石的品级最佳、所含缺陷最少,Fe-C(H)系高温高压合成金刚石次之,Ni-C系高温高压合成金刚石品级最差、所含缺陷最多;金刚石在形成过程中,除结晶生长过程外,还应该存在“排杂”过程;人们在分析天然与HPHT合成金刚石形成过程之间的关联时,除要考虑两者形成的物质体系差异外,还应该充分关注时间、空间因素在金刚石形成过程中的意义。

Investigations of crystal habit, quality and defects analysis of natural diamond and HPHT synthetic diamonds from Fe-C(H) and Ni-C system by Raman and PL spectra indicate that most of the diamonds from Fe-C(H)system have an octahedral habit which is the main habit in natural diamond, while most of the diamonds from Ni-C system have a hexakisoctahedral habit. Because there are more photoluminescence centers in synthetic diamond from Ni-C system than that from Fe-C(H)system, and in synthetic diamond than in natural diamond, the quality of natural diamond is best though it forms in more polygenic environment, which suggested that during the process of diamond formation clearing“impurity”must occur. Therefore, the authors believe that not only the substance system variance but also time and space conditions for diamond formation should be considered when the authors try to probe into the relations of formation process between natural and HPHT synthetic diamonds.