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The dependence of the acoustic-phonon velocities in tetragonal BaTiO 3 on the propagating direction in the (010) plane has been measured by means of Brillouin scattering. The behavior of the acoustic velocities is well interpreted by the coupled mode theory due to the interaction between the acoustic mode and the soft optic mode. The values of all elastic moduli except for C 12 C have been determined and the coupling strength is discussed.
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Ishidate et al. (1987) studied this question.
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