Generalized susceptibility of dislocation in ferroelectrics

Bending vibrations of dislocations in ferroelectric crystals are investigated. Vibration spectrum is shown to consist of two branches: “quasi-acoustic” (ω → 0 at q → 0, where ω, q - are frequency and wave vector, respectively) and “quasi-optical” (ω ≠ 0 at q = 0). Generalized susceptibility of dislocation is calculated. It is shown that energy dissipation at crystal polarization vibrations, accompanying dislocation vibrations, has a noticeable influence on dislocational vibrations damping.

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