Light scattering measurements are investigated as a function of temperature from 10 to900 Kin the tetragonal andcubicphasesofaPbTi0,crystal. Phononfrequencies, ionic effective charges, spontaneous polarization and contribution to the dielectric permittivity arededucedfromthesedata.Theresu1tsshowthat thesoft phononandrelaxationmode are both needed to describe the dynamics of this material.
PACS. 64.60 -General studies of phase transitions. PACS. 78.30 -Infrared and Raman spectra and scattering. PACS. 77.80 -Ferroelectricity and antiferroelectricity. PACS. 63.20 -Phonons and vibrations in crystal lattices.
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