転位と不純物との相互作用に関する研究その3 : KCl:Sr^2+単結晶中で転位が不純物から離脱するのに必要な活性化エンタルピーについて

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The strain-rate cycling tests during the Blaha effect measurement were carried out for KCl:Sr^2+ single crystals at 80 to 240K. Activation enthalpy, H, for the breakaway of the dislocation from the impurity was obtained by using the (Δτ'/Δlnε)_P, which is given by the difference between strain-rate sensitivity at first plateau place and at second one on the relative curve of strain-rate sensitivity and stress decrement. As a result, H(T_C) was found to be 0.63eV on the assumption that the interaction between a dislocation and the impurity is approximated by the Fleischer's model. T_C is the critical temperature, at which the effective stress is zero.
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