Fundamental insights on scale-dependent phenomena in barium titanate-based ferroelectrics: critical grain size and effect of nanostructuring (FerroScale)
Project code: PN-III-P4-ID-PCE-2016-0817
Project number: 192 ⁄ 2017
Funded by the Executive Unit for Financing High Education, Research, Development and Innovation, CNCS – UEFISCDI
BaTiO3 is the prototype ferroelectric oxide, widely used in microelectronics due to its dielectric, piezo, pyro, ferroelectric and electro-optic properties, which can be tailored by substitutions and by microstructural factors (density, internal stress, morphology: size, shape, texture). In the last years, the miniaturization trend of the elements in microelectronics has imposed the need of developing new BaTiO3 based ceramics with reduced grain sizes towards few tenths of nanometers, which has opened a new fundamental research topic: the role of the grain size on the functional properties. Grain size is an important parameter to tailor the functional properties in BaTiO3 because around 1 micrometer some properties are maximized. However, for applications is essential to preserve high values for the material constants while reducing grain size at nanoscale. Understanding why enhanced properties are found at the critical grain size of 1 micrometer and extending to other systems the ways to reproduce such specific conditions to acquire enhanced properties is very challenging. The major goal of the present project is to clarify missing aspects concerning size-dependent phenomena in BT-based ferroelectrics by a novel experimental-modeling multiscale approach (macroscopic, mesoscopic and at nanoscale) and by a multidisciplinary study involving innovative chemistry for preparation, complex nano/microscale characterization, detailed investigation of the functional properties and multiscale complex modeling tools.