Interactions of Point Defects with Dislocations in Sodium Chrolide Crystals. I

概要

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The internal friction of pure Nail crystal has been measured to study theprocesses of pinning and unpinning of point defects around a dislocation. Thespecimens were prepared by cleaving. They were compressed about 1.5 % at roomtemperature after annealing at 700'C for 10 hours, and then used as the specimens.The measurements have been carried out on both pinning and unpinning processesby the Marx's oscillator method using an automatic control circuit. The resultsindicate that the number of pinners on dislocation increases or decreases propor-tionally to 1/3 power of time with the activation energy, 0.25gg0.05 eV, in bothprocesses. On the basis of calculation on the defect distribution around a vibratingdislocation, the t"' dependence is quantitatively explained.
社団法人日本物理学会の論文
1979-07-15