Impurity centers

Dynamics of the interface in piezoelectric with the temperature gradient under cooling with a finite rate

A. A. Chevrychkina, A. L. Korzhenevskii

Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg, Russia

Abstract: The paper analyzes the dynamics of an interphase boundary (IPB) entrained by a moving isotherm with a given velocity $V_{iso}(t)$ in a ferroelectric with a piezoelectric effect in the paraphase. Within the framework of the model, in which the dependence of the thermodynamic potential on polarization is given by two intersecting parabolas, a non-linear differential equation of the second order is derived for the $X(t)$ coordinate of the nonstationary IFB. It is shown that this equation describes the dynamics of the IFB well for almost all experimentally used modes of isotherm motion.

Keywords: phase transition, piezoelectric effect in paraphase, temperature gradient, moving isotherm, derivation of the differential equation of motion for nonstationary interphase boundary.

Received: 10.08.2023
Revised: 17.09.2023
Accepted: 18.09.2023

DOI: 10.61011/FTT.2023.11.56557.179

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