Abstract
An attempt has seen made to study the behaviour of dislocation atmosphere in NaCl crystals by internal friction and conductivity measurements. From a migration energy of divalent impurity-vacancy complex, E m , in pure NaCl crystals, and a binding energy of the complex, E b , an activation energy for exchange between the divalent impurity and neighbouring vacancy is deduced as E a = E m + E b =0.82 ±0.05 eV. The t 1/3 dependence of unpinning process of point defects is explained through simple calculation, assuming that the distribution of divalent impurity-atmosphere is controlled by elastic interaction potential, and not by the electrical potential of dislocation.
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