Combined TEM and STEM study of the brown colouration of natural diamonds

被引：7

作者：

Barnes, R. ^{[1
]}

Bangert, U. ^{[1
]}

Martineau, P. ^{[1
]}

Fisher, D. ^{[1
]}

Jones, R. ^{[1
]}

Hounsome, L. ^{[1
]}

机构：

[1] Univ Manchester, Sch Mat, Manchester, Lancs, England

来源：

EMAG-NANO 2005: IMAGING, ANALYSIS AND FABRICATION ON THE NANOSCALE | 2006年 / 26卷

关键词：

D O I：

10.1088/1742-6596/26/1/037

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A range of natural brown, colourless and HPHT-treated single crystal diamonds are analysed via Transmission Electron Microscopy (TEM). Graphitic inclusions are found only in specimens originating front diamonds with brown colour. The inclusion sizes range from slivers of around 50nm by 5-10mn, to regions around 10 mu m in diameter with undefined boundaries. The suspected proportion, of graphite to diamond were confirmed by micro-RAMAN spectroscopy. The orientation relationship, measured via diffraction and lattice imaging, was found to be diamond {111} and {110} planes parallel to graphitic basal and {(2) over bar 110} planes respectively, where three diamond {111} planes coincide with two graphitic basal planes. This orientation, suggesting diamond 111-vacancy platelets, is consistent with defects associated with a featureless optical absorption spectrum similar to brown diamond. Vacancies and dislocations in diamond and their link to brown colouration will continue to be studied.

引用

页码：157 / +

页数：2