Abstract
The great volume of research now being done on solid-state diffusion, resulting more than one hundred papers per year, gives same idea of the importance which is attached to understanding the mechanisms by which and the rates at which atoms move with respect to their neighbours in crystalline substances. Diffusion is the dominant step in many familiar metallurgical processes: carburizing, the growth of oxides on metals and precipitates in metals, and sintering, to name only a few. In the limited space available far this review, it is impassible to give a complete bibliography or to disscuss all the interesting problems at present under investigation. Fortunately, a bibliography, nearly complete up to the end of 1956, can be quickly compiled from the many recent monographs, symposia, and review articles given as references 1–16. This account refers only to the outstanding papers bearing on each topic discussed. When conflicting data exist, usually only the measurements which seem to the author most likely to be correct are cited.
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