天然与Fe-C（H）系高温高压合成金刚石多晶的光学属性对比研究及意义（下）

山东蒙阴天然金刚石多晶与Fe-C（H）系高温高压（HPHT）合成金刚石多晶的光学显微镜、拉曼光谱、光致发光谱及红外光谱等的对比研究表明,相似的金刚石晶粒形态、表面生长台阶、结构功能团及缺陷等决定着两者存在成因上的联系;而自金刚石多晶的深部至表面,缺陷的不同变化规律及金刚石晶粒间聚集方式的差异等暗示着两者的生长历史并不完全相同;天然金刚石多晶的形成可能经历早期快速成核-长大、中期长大及漫长的后期改造三个阶段;基于晶体成核、长大及后期改造的思想,从微结构、微成分的角度厘定金刚石多晶中的标型信息,有利于拓展金刚石找矿、地球深部重大科学问题探讨等的思路和方法,也有利于为高品级金刚石多晶的合成提供新的科学线索。

Comparison study on the optical properties of natural and HPHT synthetic polycrystalline diamond from Fe-C（H） system and its significance

In the paper,the investigations of optical microscopy,Roman and PL spectra,IR spectra of natural polycrystalline diamond from Mengyin diamond mine of Shandong province,China,and the HPHT synthetic polycrystalline diamond from the Fe-C（H） system are indicated that they are related in origin because of the similar diamond crystal grains habit,the zigzag stripes on the diamond surface,structure function and defect etc.However,the different changes law of the defects and the difference of the coalescence way of diamond crystals grains from the depth to the surface mean that the growth history of two kinds diamond are not totally the same.The natural polycrystalline diamond formation may be divided into three stages,namely nucleation and growth in the early stage,growth in the middle stage and endless transformation in the last stage.Based on the thought of crystal nucleation,growth and later transformation to determinate the sign information of polycrystalline diamond from micro-structure and micro-composition,it may benefit to find new ideals and methods for the development of diamond prospection and scientific issues about deep earth,and to provide new scientific clues to synthesize high quality polycrystalline diamond.