Investigation of the mesoscopic polar order and size effects in driving polarization mechanisms of tunability in perovskites

Financed by the Romanian National Authority for Scientific Research, CNCS – UEFISCDI,
project PN-II-RU-TE-2012-3-0150, no. 24 /26.04. 2013


The aim of the project is to produce, investigate and describe by modeling tools the polarization mechanisms that contribute to the nonlinear properties in a few complex oxide systems, to understand the intrinsic/extrinsic contributions to the induced polarization driven by size, boundary conditions, order & nanoscale defects, in order to describe and control them for determined applications.

Due to the complex unresolved fundamental physics problems, in the present project it is proposed to investigate by a multiscale experimental-modeling approach the nonlinear properties of different nanostructured systems and compositionally-induced ferroelectric-relaxor crossover. An important task of the present project is to develop theoretical and computational approaches (finite element models (FEM) Ising, Potts, Monte Carlo simulations, phenomenological models) to simulate peculiar types of nonlinear responses for systems with various grain sizes and compositions. Another task is to understand the intrinsic contribution to the nonlinear properties by correlated macroscopic/mesoscopic experiments with theoretical models. Finally the complex problem of nonlinearity in oxide systems will be solved by a multiscale approach