The structure and mechanism of formation of platelets in natural type Ia diamond
The structure and mechanism of formation of platelets in natural type Ia diamond
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天然Ia型金刚石片晶的结构和形成机制
DOI：
10.1098/rspa.1982.0059
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
P. Humble
中科院分区：
文献类型：
--
作者：
P. Humble
对天然Ia型钻石中的中型和大型血小板进行了观察。人们曾试图用电子衍射的方法来检测薄片结构中的任何规律性，但没有发现。与薄片相关的位移被确定为外在的，垂直于薄片平面，量值为0.4。这个值导致了一个模型的建议，其中的血小板结构的碳原子五角键合到周围的金刚石基体的间隙层组成。在保持完整四面体键合的同时，详细键合的方式可以变化，可以导致与衍射证据一致的不规则结构。产生间隙碳原子的可能机制被认为是氮在这方面的作用，并在提供可能的核血小板生长进行了讨论。
Observations have been made on medium- and large-sized platelets in a natural type Ia diamond. Attempts have been made to detect any regularity in the structure of the platelets by means of electron diffraction, but none was found. The displacement associated with the platelets has been determined to be extrinsic, normal to the plane of the platelet and of magnitude 0.4 ‹010›. This value has led to the proposal of a model for the platelet structure in which the platelet consists of an interstitial layer of carbon atoms pentagonally bonded to the surrounding diamond matrix. The way in which the detailed bonding may be varied, while complete tetrahedral bonding is maintained, can lead to irregular structures consistent with the diffraction evidence. Possible mechanisms for producing interstitial carbon atoms are considered and the role of nitrogen in this context and in providing possible nuclei for platelet growth is discussed.