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Published in last 50 years
The attenuation of sound is studied theoretically using the Silverman model, which predicts an anomalously large attenuation constant near the Curie point.
With the use of the Silverman model the temperature and wave number dependence of the lifetime of the soft modes in displacive ferroelectrics is calculated explicitly, whereby Cowley's experiments SrTiO 3 by neutron scattering are explained.