Yang Zhi-Jun, Li Hong-Zhong, Zhou Yong-Zhang, Wang Xiao-Yue, Luo Feng
Department of Geoscience, Sun Yat-sen University, Guangzhou 510275, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 Dec;29(12):3304-8.
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.
通过拉曼光谱和光致发光光谱对来自Fe-C(H)和Ni-C体系的天然金刚石以及高温高压合成金刚石的晶体习性、质量和缺陷分析表明,Fe-C(H)体系中的大多数金刚石具有八面体习性,这是天然金刚石的主要习性,而Ni-C体系中的大多数金刚石具有六八面体习性。由于Ni-C体系合成金刚石中的光致发光中心比Fe-C(H)体系合成金刚石中的多,且合成金刚石中的光致发光中心比天然金刚石中的多,所以天然金刚石虽然形成于更多的多源环境中,但其质量却是最好的,这表明在金刚石形成过程中必然发生了“杂质”清除。因此,作者认为,在探讨天然金刚石与高温高压合成金刚石的形成过程之间的关系时,不仅要考虑物质体系的差异,还要考虑金刚石形成的时间和空间条件。