Funding: State budget
Grant: PN-III-P4-ID-PCE-2016-0072 (contract no. 134/13.07.2017)
Title: CONTROLLED FUNCTIONALITIES IN MULTISCALE BaTiO3-BASED SYSTEMS BY COMBINING MICROSTRUCTURAL DESIGN AND DOPING STRATEGY (BATIFER)
Value of the contract: 850 000 lei
Period: 30 months (July 2017- December 2019)
The aim of this project is to propose a new approach for investigating the influence of the extrinsic versus intrinsic contributions on the electrical behaviour in the compositionally modified-BaTiO3-based systems. Therefore, aliovalently and homovalently doped-BaTiO3 ceramics, with certain fixed dopant/solute concentrations and with a wide range of grain sizes, from microscale downward to nanoscale, will be prepared from powders synthesized by various variants of the sol-gel method and consolidated by using alternative sintering techniques (conventional and spark plasma sintering). In this way, it is envisaged to adjust the semiconducting-insulating behaviour in multiscale Ce3+ doped-BaTiO3 and to tailor ferroelectric-relaxor crossover in multiscale BaTiO3 ceramics with Hf4+ additions. Another goal consists in enhancing ferroelectricity in dense Ce3+ doped-BaTiO3 (BCT) thin films and 1D nanostructures. The investigation of Ce3+ doped-BaTiO3 products with similar composition, but corresponding to dissimilar dimensionalities (1D, 2D and 3D), will allow elucidate and to understand the role of the restrictive geometries on the dielectric/ferroelectric/piezoelectric response. For this reason, multilayer thin films will be prepared by chemical solution deposition, while infiltration of negative templates will be used to elaborate 1D nanostructured wires/tubes. All these objectives involve a complex physico-chemical and functional characterization by using modern and complementary techniques.