Abstract
Natural polycrystal diamonds, carbonado and bailas, were observed with an ultra-high voltage transmission electron microscope and the characteristic microstructures were discussed. Carbonado had randomly oriented dislocations with Burger's vectors, a/2 〈110〉. From diffraction patterns an inclusion in carbonado was thought to correspond to a mineral such as a serpentine. On the other hand, ballas had polygonized dislocations and dislocation loops and the inclusion in it was uncertain. The microstructural differences between the two diamonds were discussed from the view point of the conditions of diamond formation.
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Moriyoshi, Y., Kamo, M., Setaka, N. et al. The microstructure of natural polycrystal diamond, carbonado and ballas. J Mater Sci 18, 217–224 (1983). https://doi.org/10.1007/BF00543828
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DOI: https://doi.org/10.1007/BF00543828