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The internal friction of germanium single crystals is investigated in the temperature range from 77 to 503 °K at resonance frequencies of about 1200 Hz. Two relaxation peaks P1 and P2 with activation energies of (0.62 ± 0.03) and (0.85 ± 0.03) eV, respectively, are observed to develop in deformed crystals. The height of peak P1 increases drastically upon deformation while it decreases gradually upon annealing. Peak P1 is interpreted to be associated with the motion of geometrical kinks on dislocations. Peak P2 develops only after a moderate plastic deformation followed by a subsequent annealing. It could be interpreted to be associated with the motion of dislocations in the surface region by means of single kink formation.
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Ohori et al. (1972) studied this question.
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