High amplitude ultrasonic vibrations with frequencies f, z 90 kHz and vibration amplitudes E I 3.4 .were used to obtain oscillatory stresses D 5 14 MPain CdS single crystals. Such treatment leads to the nucleation of cracks in annealed samples and to the formation of dislocations in as-grown samples. The different behaviour can be explained by the reduction of the free dislocation segment lengths due to the diffusion of point defects towards the dislocation lines during the annealing treatment.Durch Ultraschallschwingungen mit Frequenzen um 90 kHz und mit hohen Schwingungsamplituden E I 3,4.wurden mechanische Wechselspannungen u I 14 MPa in CdS-Einkristallen erzeugt. Eine solche Behandlung fiihrt in getemperten Proben zur RiBbildung; wahrend in unbehandelten Proben Versetzungen erzeugt werden. Dieses unterschiedliche Verhalten ist durch eine Verringerung der freien Langen von Versetzungssegmenten zu erklaren, die durch Diffusion von Punktdefekten zu Versetzungslinien wahrend des Temperns hervorgerufen wird.
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