Abstract
IN reply to the remarks of Mr. McKeehan regarding the paper which we have recently published, the point in question is whether twins of metallic crystals form a plane which passes through atom-centres. According to the hypothesis brought forward by us, the twinning of the face-centred cubic lattice takes place on the octahedral planes. Thus the two halves are arranged in a symmetrical position after a rotation of 180° about an axis normal to the octahedral plane. Obviously, in this case, the twinning plane does not pass through any atom-centres. In the face-centred cubic lattice the closest interatomic distance is L/2. When twinned in the way mentioned above, however, the closest distance apart between atoms along the twinning plane is L/3, where L is the lattice parameter in both cases. The change in the closest interatomic distance on twinning appears to be the cause of the local stress to which Mr. McKeehan refers, although, as he says, “there is no experimental evidence” regarding this point.
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CARPENTER, H., TAMURA, S. The Formation of Twin Metallic Crystals. Nature 119, 121 (1927). https://doi.org/10.1038/119121a0
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DOI: https://doi.org/10.1038/119121a0
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