Effect of Peierls relief on the low-temperature plasticity of pure CdTe crystals

The stress relaxation kinetics is investigated in the vicinity of the yield stress in pure CdTe crystals in the temperature range 200–300 K. The thermoactivation analysis of the results is carried out by assuming that: (1) the motion of dislocations under plastic deformations is hampered by thermally unsurmountable barriers forming effective internal stresses, as well as by Peierls barriers which can be overcome due to a thermally activated formation on the dislocation line and due to a dispersion of kink pairs along this line; (2) the limit of small effective stresses (as compared with Peierls stresses) is realized in the experiment. A satisfactory agreement is obtained between the experimental results and the model. The empirical values of the kink pair energy, Peierls stress, the linear density of the intrinsic energy of a dislocation, internal stresses, and the separation between supersteps on screw dislocations playing the role of athermal barriers are obtained.

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