【作者】 郑秋菊；

【导师】 于万里；

【作者基本信息】 燕山大学 ， 材料学， 2003， 硕士

【摘要】 本文提出了采用同步辐射白光貌相术计算晶体缺陷空间走向的方法。采用这种方法，并结合FTIR、SEM等分析手段，对南非天然金刚石、辽宁天然金刚石以及合成金刚石晶体缺陷进行了研究。前人采用同步辐射单色光确定晶体缺陷的空间走向，本文采用白光，大大提高了实验效率，实验条件易于实现。论文中介绍了采用同步辐射白光貌相术计算晶体缺陷空间走向的实验方法、计算原理和方法，并对计算误差进行了分析和修正。利用同步辐射白光貌相术分析并计算了金刚石晶体中位错的空间分布及其走向。天然金刚石样品中位错线多数近于平行<111>珺urgers矢量为<110>2；合成金刚石样品中位错束多数平行于<100>?110>淮硎啥嗵蹙哂胁煌珺urgers矢量的位错组成。天然金刚石的主要生长面为{111}，合成金刚石的主要生长面为{100}、{110}。研究了金刚石同步辐射形貌像中星芒像的成因。实验中观察到未受熔蚀的天然金刚石样品的形貌像中出现了星芒像，而受熔蚀的天然金刚石样品和合成金刚石样品的形貌像中都未发现星芒像。分析了产生星芒像的影响因素，结合金刚石的形成条件和生长历史，讨论了星芒像的形成原因。分析了白颗粒合成金刚石。结果表明，白颗粒中含有气态包裹体。更多还原

【Abstract】 An approach to calculate the orientation of the crystal defects using continuous spectra synchrotron radiation was proposed in this paper. By this method, with the addition of FTIR, SEM, et al, natural diamonds from South Africa and Liaoning as well as some synthetic diamonds were studied.Monochromic spectrum of synchrotron radiation was previously used to determine the crystallographic directions of the defects. However, continuous spectra were adopted instead in this paper. Compared with the former, the efficiency was greatly improved and the experiment was easier to implement Experiment techniques, computing philosophy and calculation process were introduced in detail. Calculation errors might be brought in the experiment was estimated in this paper.Crystal defects in natural and synthetic diamonds were analyzed by synchrotron radiation topography. It was found that the dislocation directions of natural diamonds were parallel to {111} and their Burgers vectors were <110>2 while the orientations of the dislocations in synthetic diamonds were parallel to <100>or <110>and their Burgers vectors were in different directions. Hereby, {111} are the main crystal planes in natural diamonds while in synthetic diamonds the main crystal faces were {100} and {110}. Spike images appeared in synchrotron radiation topographs of some natural diamonds and their genesis were studied. Such images were never seen in the topographs of synthetic diamonds. The possible causations of the spike images were discussed. Further more, the history of the diamonds of South Africa and Liaoning were speculated. White synthetic diamond grains were studied. Only gas was found in the inclusions in white grains.更多还原