Modelización microscópica mediante simulaciones Monte Carlo de los procesos de histéresis en materiales Ferroeléctricos Relaxores

Abstract

In this project, we propose a microscopic model for explaining the relaxor phenomenon starting from the interaction between the dipoles that are created within the material. Additionally, we study the formation within the material of nano regions, that is, connected regions where the dipoles of the crystalline cells have the same direction. To do so, we propose an algorithm, based on the Theory of Complex Systems, to find the distribution which follows the sizes of these nano regions. After a certain size, the nano regions could be related to the so called polar nano regions, which have physical meaning. We find that our model is capable of reproducing the experimental properties of both the ferroelectric and relaxor ferroelectric materials.