Abstract
The influence of electric and ultrasonic fields on the vibrational motion of disolocations in alkali-halide crystals was investigated by the method of current-voltage characteristics I(V) and the measurement of the amplitude dependence of the damping Q−1(ε0) and the defect of the modulus ΔM/M(ε0) in a composite piezoelectric oscillator. An abrupt decrease of I(t) is observed at amplitudes of the relative deformation ε0=10−6−10−5. The internal friction at the same ε0 reveals an amplitude dependence, while establishment of steady values is attained by passage through the maximum of Q−1(t). The electric field shifts the amplitude of the onset of the abrupt decrease of I(t) into the region of smaller ε0. The displacement of the vibrating dislocation at an amplitude ε0 corresponding to the onset of the singularity of I(t) is near the value of the radius of the Debye-Hückel cloud surrounding it. The characteristic times of the process correspond to the relaxation time of a free charge in an insulator.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 92–98, May, 1987.
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Belozerova, É.P. Mechanism of the influence of ultrasonic and electric fields on the vibrational motion of dislocations in the ultrasonic vibration of alkali-halide crystals. Soviet Physics Journal 30, 442–447 (1987). https://doi.org/10.1007/BF00900100
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DOI: https://doi.org/10.1007/BF00900100