Annotation
An experimental study of Young's modulus $E$ and the internal friction $Q^{-1}$ in Dy polycrystals of varying purity was carried out in the 4.2-350 K temperature range. A giant maximum of internal friction was found in the region of low temperatures (at T = 37 K and $\nu$ = 2030 Hz the internal friction is $2,15\cdot 10^{-2}$). The internal friction maximum observed in the paramagnetic temperature region had a dislocational origin. The activation energy $E_a$ of this process was 0.38 $\pm 0,05$ eV and the frequency factor $\tau_0= 2.9\cdot 10^{-11}$ s.
© 2016 Publisher M.V.Lomonosov Moscow State University
Authors
G.S. Burkhanov, S.A. Nikitin, A.M. Tishin, 0.D. Chistyakov, 0.A. Shipilov
Department of Molecular Physics and Physical Measurements, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
Department of Molecular Physics and Physical Measurements, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia