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.

在过去的几十年中，已经进行了许多努力来表征Ia型钻石中的{001}血小板缺陷。已知N集中在缺陷核心处。但是，关于该缺陷的原子结构及其在N中所起的作用的准确描述仍是未知的。在这里，通过使用像差校正的透射电子显微镜和电子能量损失谱，我们已经确定了天然Ia型钻石的血小板缺陷内的原子排列，并将其与流行的理论模型进行了匹配。血小板具有各向异性原子结构，沿着缺陷线的缺陷对呈锯齿状排列。从血小板核获得的碳K和氮K边缘的电子能量损失近边缘精细结构与间隙位置处的三角键排列一致。