Newly observed microscopic planar defects on {111} in natural diamond
- 1 May 1987
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Letters
- Vol. 55 (5) , 209-213
- https://doi.org/10.1080/09500838708203751
Abstract
Circular disc-crack-like defects randomly distributed on {111} planes have been discovered by 300kV transmission electron microscopy in diamond that had crystallized on non-faceted growth surfaces of mean orientation {100}. In a sample of ∼ 100 defects, disc diameters were narrowly distributed about a mean of 1·2 μm and one in seven discs were located on a coplanar stacking fault of average diameter 2 μm. Discs totally enclosed within the specimen exhibit concentric moiré fringes covering their image areas when viewed obliquely, showing them to be dilated into thin lenticles. Internal pressures, deduced from moiré-fringe counts on six lenticles, were in the range 1·5 to 1·8 GPa.Keywords
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