Abstract
A diatomic linear chain model is used to describe the dynamical properties of displacive type ferroelectric compounds. For these materials the non-bondingp-orbitals of the chalcogen ions play an essential role, which is taken into account by assuming a nonlinear fourth-order polarizability at the chalcogen-ion lattice site. Within the self-consistent phonon approximation soft modes, phonon dispersion curves, phonon anomalies and related quantities can be calculated for all temperatures. Going beyond the self-consistent phonon approximation, the model yields, in the continuum limit, interesting new solutions such as periodic non-linear waves, kinks, which describe the statics and dynamics of ferroelectric domain walls, and pulse solutions.
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Dedicated to Professor Harry Thomas on the occasion of his 60th birthday
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Bussmann-Holder, A. Ferroelectrics. Z. Physik B - Condensed Matter 68, 335–338 (1987). https://doi.org/10.1007/BF01304249
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DOI: https://doi.org/10.1007/BF01304249