A simple and inexpensive vacuum procedure has been employed to grow copper single crystals by the Bridgman method. Crystals grown at a lowering rate of 2 inches per hour have a high degree of perfection as indicated by the presence of Kikuchi lines on electron diffraction patterns. The perfection varies along the length of the crystal, that portion freezing last being the most perfect. It is suggested that this variation in perfection along the length will occur to some degree in all unseeded crystals made by the Bridgman method because of the greater supercooling that occurs when the first metal freezes.
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C. S. Barrett, Structure of Metals (McGraw‐Hill Book Company, Inc., New York, 1952).
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R. D. Heidenreich and W. Shockley, “Study of slip in aluminum crystals by electron microscope and electron diffraction methods,” Conference on Strength of Solids, The Physical Society, University of Bristol, 1948.
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G. P. Thomson and W. Cochrane, Theory and Practice of Electron Diffraction (MacMillan and Company, Ltd., London, 1939).
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R. D. Heidenreich, “Electron Diffraction and Microscopy of Metals,” Modern Research Techniques in Physical Metallurgy (American Society for Metals, Cleveland, 1953).
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© 1956 American Institute of Physics.
1956
American Institute of Physics
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