The internal friction Q−1 in LiNbO3 single‐domain and poly‐domain crystals is investigated. It is found that the Q−1 maximum in the vicinity of 300°C is the supperposition of two peaks. Q−1 maxima at −30 and 300°C are discussed in terms of the interaction model between domain boundaries and two types of charged point defects having different mobilities.
The evaluation of the phonon viscosity coefficient caused by interaction between 0 a mobile 90 domain boundary in a ferroelectric of the perovskite type (structure) and acoustic phonons when the width of the domain boundary exceeds their wavelengths i s the subject of the present paper. The study refers to sufficiently high temperatures T 2 2 Z E fi/4 k 6 at which the basic contribution to the viscosity coefficient is due to the short-wave phonons and this makes it possible to apply the JWKB method assuming that the change of elastic moduli in the domain boundary
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