Abstract
A LATTICE transition which is not induced by nuclei or boundaries but takes place simultaneously in the whole of a crystal by the jump of a whole lattice plane is termed ‘turn over’ (Umklappen). Such transitions are observed with certain metals (cobalt, thallium) and especially in the austenite–martensite transition. When, in 1941 in this laboratory1, the phenomenon was discovered for the first time with an inorganic salt (potassium dichromate), we were informed by Prof. L. Kofler (Innsbruck) that a similar ‘flashlike’ transition can be observed with suberic acid crystals. The features of this ‘turn over’, as we have observed it, are described here.
Published Version
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