Activation parameters of low-temperature peak of internal friction in YBa2Cu3O7–<i>x</i> ceramics
V. D. NatsikPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1P. P. Pal‐ValPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1J. EngertH Kaufmann
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Temperature dependences of the velocity and absorption coefficient of longitudinal ultrasound with two frequencies f1 = 1.25 × 105 s−1 and f2 = 75 × 105 s−1 are investigated in the temperature interval between 6 and 300 K. Hysteresis of sound velocity under thermal cycling and a series of absorption peaks are recorded. The behavior of the peak localized in the hysteresis region upon a variation of acoustic frequency is analyzed in detail. It is suggested that this peak is associated with a certain thermally activated structural process, and the activation parameters of the process are calculated.
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Koʻrsatkichlar — AkademScholar · Tez orada