Abstract
The features of infra-low frequency (10-3 - 10 Hz) internal friction, Q-1, and shear modulus, G, in proper ferroelastic KH3(SeO3)2 and its deuterated analogue KD3(SeO3)2 have been studied using the inverse torsion pendulum technique at the temperature range from 80 to 300 K and different external fields which lead to the change of domain structure. The processes of primary formation of stress-strain hysteresis loops and the relaxation processes in undoped and doped crystals are analyzed. It is shown that the anomalous behavior of Q-1 and G at infralow frequencies to a great extent depends on the crystal lattice imperfections (dislocations, point defects and domain boundaries). Mechanisms responsible for this behavior are also discussed.
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