Abstract
The temperature dependences of the damping constant and the order parameter are calculated for the lattice mode of E (1TO) in PbTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> using the experimental data by the pseudospin-phonon coupled model and the energy fluctuation model. Calculation of the damping constant of soft mode is performed in the temperature range of 400-490 °C close to the ferroelectric-paraelectric transition (T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> =493 °C) in PbTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> . By relating the frequency to the order parameter, the temperature dependence of the Raman frequency for the E (1TO) mode is calculated in the ferroelectric phase of PbTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> using the molecular field theory. Our calculated values for the damping constant and the order parameter describe the observed behaviour of PbTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> close to the ferroelectric-paraelectric transition (T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> =493 °C) adequately.
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