Blanc SIMI 8 - Sciences de l'information, de la matière et de l'ingénierie : Chimie du solide, colloïdes, physicochimie

Design of Nano structured functional Oxides – NanOxyDesign

Submission summary

In parallel to the development of nanotechnologies, the improvement of oxide functional properties through nanostructuration is gaining more and more importance. If nanocrystalline oxide materials have been studied for many years in forms of thin films in particular for integrated devices, thin film technologies do not cover all possible applications, in particular those requiring more macroscopic objects (fuel cells, thermoelectric, etc…). Then the recent possibilities to fabricate nanostructured objects with the novel Spark Plasma Sintering route (SPS) are of great interest for potential applications.

The SPS method, installed in france in 2004, indeed allows the preparation of dense nanoceramics, with grain sizes of few tens of nanometers. At the beginning, this method was essentially used for intermetallic compounds. Then, the extension to functional oxides is only very recent and the wide spectrum of original properties expected in dense nanostructured functional oxides has not been explored yet. Nevertheless, its use has already allowed to reveal some new and unexpected properties in oxide nanoceramics and also revealed the importance of oxygen stoichiometry in the properties of the nanomaterials obtained. Among the new properties, let us mention the observation of a giant dielectric constant in BaTiO3 SPS-sintered materials. Then both the interest in applications and the exploration of new functional properties in nanostructured oxide ceramics suppose a deeper understanding of the defect chemistry of this material and of its grain boundaries, in correlation to functional properties.

The main purpose of the present project is thus to develop the understanding of the defect chemistry in nanostructured oxides and then to use such knowledge to design novel nanostructured functional oxides. This objective will reached through the fabrication of nanostructured ceramics by SPS, the controlling of their oxygen stoichiometry either at equilibiurm or out-of thermodynamic equilibrium, the measurements of their functional properties and the characterisation of grain boundaries nanoscale features via unique observation methods, This research program will be attained tanks to the complementary contribution of the following partners: (1) (1the SPMS laboratory at the Ecole Centrale Paris (Partner 1), (2) the ICMMO at Orsay (Partner 2), (3) the LPS at Orsay , (4) the GPM team at Rouen. The first two partners have been involved for many years in the development of functional oxides and are members of the Ile-De-France Spark Plasma Sintering platform; the last two partners have highly recognised skills in the determination of both structural and compositional features at the atomic scale. This research consortium represents then one of the most competitive at the international level concerning the preparation and characterisation of nanostructured ceramics.

The original functional properties explored within this project will be : the proton conduction in BaZrO3 and BaSnO3-based perovskite compounds, dielectric and ferroelectric properties in SBN bronze-like oxides, thermoelectricity in ZnO, and multiferroïcity in BiFeO3 based materials. All these materials represent a extensive spectrum of the properties which might be encountered in functional oxides, going from electronic or ion conductivity to magnetic or phononic aspects. The properties explored also represent an important stake for future technologies in particular on energy problems. Proton conductors, dielectric and thermoelectric properties represent the basic materials to be used in fuel cells, supercapacitors and thermopower systems. Multiferroïc also might found very promising applications, most probably in the field of electronics.

Project coordination

Guilhem Dezanneau (CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR OUEST ET NORD) – guilhem.dezanneau@ecp.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

LPS CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR SUD
GPM CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE DELEGATION REGIONALE NORMANDIE
UMR8580 CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR OUEST ET NORD
ICMMO UNIVERSITE DE PARIS XI [PARIS- SUD]

Help of the ANR 590,000 euros
Beginning and duration of the scientific project: - 36 Months

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