Direct Observation of Crystal Imperfections Introduced by Weak Electron Irradiation in Water-Etched KCI Single Crystal

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The changes in a water-etched KCI single crystals due to weak electron irradiation were observed by means of an electron microscope and by elcctron diffraction. It was found that in a crystal, the thickness of which became large with the distance from the edge, dislocation loops appeared and their development as observable. When the change of the thickness of the crystal is pronounced, it was easy to find large dislocation loops in the thin part close to the edge of the crystal. In the case in which the size of a dislocation loop is less than 0.5μ in diameter, one dislocaltion loop changed abruptly into one void with weak electron irradiation. However, a larger dislocation loop changed into one void and several small dislocationloops. Interactions between two crystal imperfections were also observed in this experiment. From the experlmental results, the mechanism of coagulation or dispersion of vacancies in water-etched KCI crystals under weak electron irradiation is discussed.
社団法人日本物理学会の論文
1965-02-05