Abstract
High-resolution Brillouin spectroscopy was used to investigate the elastic properties of $[{\mathrm{NH}}_{3}{(\mathrm{C}\mathrm{H}}_{3}{)]}_{5}{\mathrm{Bi}}_{2}{\mathrm{Cl}}_{11}.$ The temperature dependences of nine phonon modes propagating in the directions [100], [010], [001], [110], [101], and [011] were obtained in the temperature range from 120 to 330 K. Strong correlations were found with the electric polarization mode which exhibits anomalous behavior at 307 and 170 K. A theoretical explanation of the experimental observations was given in terms of Landau-type free energy expansion for two inequivalent sublattices. Discussion was provided regarding the possible types of couplings between strain tensor components and spontaneous polarization.
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