The major objective of the project is to investigate by a complex modeling/experimental approach the role of porosity at various length scales and for different pore shapes on the functional properties of ferroelectric materials.

Specific objectives:

OI: Study of the role of porosity on tunability in porous paraelectric materials. Different types of porous materials will be described by modeling tools and the best configurations will be produced, experimentally investigated and compared to the modeling results:

OI.1 Modeling the tunability properties of porous ferroelectrics,

OI.2 Experimental study of the role of porosity on the low and high field properties of porous ferroelectrics in paraelectric state (e.g. BST, BZT, PMN ).

The expected scientific impact is related to: development of original multiscale models based on 3D FEM (at microscale level) and LGD theory (at mesoscale level), to describe the role of the microstructures on the nonlinear dielectric properties of porous ferroelectrics; understanding the relation between the porosity and effective properties through local field distortion at mesoscale. Novelty: a new approach in controlling the tunability properties by local field engineering and porosity control.

OII: Study of the role of porosity on the switching properties of porous ferroelectrics. The role of porosity on the switching properties at different length scales from nanoscale (lower than domain size) to microscale (larger than domain size) and various microstructures will be simulated by a complex multiscale approach (Monte Carlo and Preisach models to describe domain structures and switching properties at mesoscale and 3D FEM to describe local field inhomogeneity). The most interesting configurations will be selected to be produced, investigated and compared with simulations results:

OII.1 Modeling of the role of porosity on the switching properties of porous ferroelectrics.

OII.2 Experimental verification for porous ferroelectric ceramics (e.g. PZT, PMN-PT, BT) with different sizes and shapes of the pores.

The expected scientific impact: the contribution to understand the role of porosity on the properties of ferroelectrics at different length scales: domain structures, local hysteretic responses at mesoscale and macroscopic effective dielectric and ferroelectric properties.

OIII. Managerial objective. This objective includes: coordination of the research activity, dissemination activity (preparation and publication of ISI papers, presentations at international conferences, web-site, yearly scientific reports), acquisition of equipments and materials, etc.

MODx - Mollio