Abstract
Based on molecular kinetic concepts, we have theoretically studied the processes of polarization and repolarization in ABO3 crystals with a perovskite structure. We have calculated the free energy taking into account the possible displacements of the A atoms of the transition element from the equilibrium positions and the ordering of the dipole moments; we have found the dependence of the free energy for different phases of the crystal on temperature, the dipole order parameter, and the energy constants. We have obtained the thermodynamic equilibrium equation determining the temperature dependence of the degree of dipole order; we have found the Curie-Weiss transition temperature from the paraelectric to the ferroelectric state. Analysis of the equations obtained allowed us to provide a basis for the polarization and repolarization processes observed experimentally in BaTiO3 and KNbO3 crystals and to estimate the phase transition temperatures.
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Dnepropetrovsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 8–14, May, 1995.
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Matysina, Z.A. Spontaneous polarization and repolarization in crystals of the perovskite type. Russ Phys J 38, 443–448 (1995). https://doi.org/10.1007/BF00559296
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DOI: https://doi.org/10.1007/BF00559296