Elastic excitations in BaTiO_{3} single crystals and ceramics: Mobile domain boundaries and polar nanoregions observed by resonant ultrasonic spectroscopy
作者： Ekhard K. H. Salje , Michael A. Carpenter , Guillaume F. Nataf , Gunnar Picht , Kyle Webber
DOI: 10.1103/PHYSREVB.87.014106
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摘要: The dynamic properties of elastic domain walls in BaTiO3 were investigated using resonance ultrasonic spectroscopy (RUS). sequence phase transitions is characterized by minima the temperature dependence RUS frequencies and changes Q factors (resonance damping). Damping related to friction mobile twin boundaries (90° ferroelectric walls) distorted polar nanoregions (PNRs) cubic phase. largest tetragonal ceramic materials but very low single crystals. also small low-temperature phases sample slightly increases with decreasing crystal. angle between real imaginary part response function drastically remains constant orthorhombic Other show a moderate on showing systematic microstructures. Mobile (or sections such as kinks inside contribute strongly energy dissipation forced oscillation while reduction effective modulus due relaxing domains weak. Single crystals ceramics strong precursor softening (PNRs). decreases when transition point cubic-tetragonal transformation approached from above. follows similar recent results Brillouin scattering. Between Burns (≈586 K) Tc at 405 K, we found good fit squared frequency [∼Δ (C11−C12)] Vogel–Fulcher process an activation ∼0.2 eV. Finally, some first-principles-based Hamiltonian computations carried out explain these observations terms dynamics soft mode central mode.
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