We study the dependence of internal friction on the amplitude of ultrasound oscillation in the monocrystals of cesium iodide, which were plastically deformed during preparation and mounting; we also studied aged sample. In samples oriented along [110], we observe an amplitude dependence of the internal friction. It is shown that the internal friction is caused by the dislocation mechanism of ultrasound absorption. We estimate the change of the effective length of dislocation loops during aging.
Department of Molecular Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119991, Russia
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