The model of the hysteresis for materials in which depending on composition the transition from relaxor to ferroelectric properties take place
Faculty of Computer Science and Materials Science, Department of Material Science, University of Silesia, 2 Śnieżna Str., 41-200 Sosnowiec, Poland
We study the question about the continuous transition from relaxor to normal ferroelectric state, depending on the composition and the influence of external electric field. In this paper we present the main assumptions of the model of dielectric hysteresis for such materials. The model is based on the elements of classical thermodynamic theory, mainly on the assumption that the density of free energy g can be developed into terms with respect to polarization. However unlike LGD theory we assume that all parameters of development are dependent on the temperature. The average spontaneus polarization is obtained as a result of integrating dipole moments which probabilities are different.
© EDP Sciences, Springer-Verlag, 2008