Abstract
IN a recent communication1 I reported that good type I diamonds gave bad divergent-beam photographs, the deficiency (absorption) lines being scarcely, if at all, visible against a foggy background, whereas type II diamonds gave excellent divergent-beam photographs. I suggested that this could be explained if the type I diamonds were 'ideal' and type II diamonds 'mosaic' in structure. The poor photographs would be an indication of large primary extinction.
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References
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LONSDALE, K. X-Ray Divergent-Beam Photography as a Test of Crystal Perfection. Nature 153, 433–434 (1944). https://doi.org/10.1038/153433a0
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DOI: https://doi.org/10.1038/153433a0
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