Abstract
DURING a study of age-hardening in single crystals of aluminium containing 4 per cent copper, certain anomalies in the Laue photographs were noticed1. Some of these were associated with the progress of hardening, but others appeared to be due to another cause. Further investigation showed the presence on the Laue photographs of single crystals of aluminium, of certain faint streaks also observed in photographs of the alloy. When photographed at 550° C., the intensity of these streaks or ill-defined spots greatly increased. Similar effects were observed in sodium chloride and magnesium oxide. The effect observed in sodium chloride at room temperature has already been noted by Wadlund2, and an explanation of its origin given by Zachariasen3. The fact that the effect becomes much more intense when the temperature is raised suggests that it is due to thermal vibrations of the lattice. In diamond at 500° C. a faint effect similar to that obtained with the other crystals is present, although little is to be seen at room temperature.
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References
NATURE, 142, 569 (1938).
Phys. Rev., 53, 843 (1938).
Phys. Rev., 53, 844 (1938).
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PRESTON, G. A Temperature Effect in Laue Photographs. Nature 143, 76 (1939). https://doi.org/10.1038/143076a0
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DOI: https://doi.org/10.1038/143076a0
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