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arXiv 1209.1485cond-mat.mtrl-sciphysics.geo-ph
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天然金刚石中的扩展缺陷:原子力显微镜研究

Extended defects in natural diamonds: Atomic Force Microscopy investigation

Radmir V. Gainutdinov, Andrey A. Shiryaev, Yana Fedortchouk

摘要:

用原子力显微镜研究了天然金刚石在H_2O、CO_2和H_2 O-NaCl溶液中的高压腐蚀表面。晶体的部分溶解产生了几种类型的表面特征,包括众所周知的三角区和小丘,并揭示了几种新类型的缺陷。除了众所周知的三角区和溶解丘几种新类型的缺陷观察。最显著的是几种滞弹性孪晶。丰富的microtwins,有序的小丘和缺陷的存在下,大概与结的分支位错的观察表明生长后的变形事件对金刚石显微结构的形成的重要性。这项工作证实了以前的报告中的一些变形金刚石的扩展缺陷的顺序。此外,目前的工作表明,天然金刚石变形不仅是位错机制和滑移,但机械孪生。主要机制应取决于压力-温度-应力条件下的金刚石从形成域地球表面的运输。

英文摘要:

Surfaces of natural diamonds etched in high-pressure experiments in H2O, CO2 and H2O-NaCl fluids were investigated using Atomic Force Microscopy. Partial dissolution of the crystals produced several types of surface features including the well-known trigons and hillocks and revealed several new types of defects. Besides well-known trigons and dissolution hillocks several new types of defects are observed. The most remarkable ones are assigned to anelastic twins of several types. The observation of abundant microtwins, ordering of hillocks and presence of defects presumably related to knots of branched dislocations suggests importance of post-growth deformation events on formation of diamond microstructure. This work confirms previous reports of ordering of extended defects in some deformed diamonds. In addition, the current work shows that natural diamonds deform not only by dislocation mechanism and slip, but also but mechanical twinning. The dominant mechanism should depend on pressure-temperature-stress conditions during diamond transport from the formation domain to the Earth surface.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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