钻石
电子能量损失谱
之字形的
透射电子显微镜
石墨烯
化学
碳纤维
各向异性
化学物理
结晶学
晶体缺陷
材料科学
分子物理学
纳米技术
光学
物理
复合材料
几何学
数学
有机化学
复合数
作者
E.J. Olivier,J.H. Neethling,R.E. Kroon,S.R. Naidoo,Christopher S. Allen,H Sawada,Peter A. van Aken,Angus I. Kirkland
出处
期刊:Nature Materials
[Springer Nature]
日期:2018-02-21
卷期号:17 (3): 243-248
被引量:19
标识
DOI:10.1038/s41563-018-0024-6
摘要
In the past decades, many efforts have been devoted to characterizing {001} platelet defects in type Ia diamond. It is known that N is concentrated at the defect core. However, an accurate description of the atomic structure of the defect and the role that N plays in it is still unknown. Here, by using aberration-corrected transmission electron microscopy and electron energy-loss spectroscopy we have determined the atomic arrangement within platelet defects in a natural type Ia diamond and matched it to a prevalent theoretical model. The platelet has an anisotropic atomic structure with a zigzag ordering of defect pairs along the defect line. The electron energy-loss near-edge fine structure of both carbon K- and nitrogen K-edges obtained from the platelet core is consistent with a trigonal bonding arrangement at interstitial sites. The experimental observations support an interstitial aggregate mode of formation for platelet defects in natural diamond. The accurate structure of the platelet defects in diamond is now resolved by transmission electron microscopy, and, out of all the proposed models, it agrees well with the zigzag atomic model.
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