Nanocomposite Ferroelectric Perovskites and Ionic Conductors by Colloidal Chemistry: Versatile Approach to the Synthesis of Functional Materials with Tailored Structures (Abstract/Poster in atti di convegno)

Type
Label
  • Nanocomposite Ferroelectric Perovskites and Ionic Conductors by Colloidal Chemistry: Versatile Approach to the Synthesis of Functional Materials with Tailored Structures (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Buscaglia M. T.; Viviani M.; Buscaglia V.; Bassoli M.; Bassano A.; Nanni P.; Mitoseriu L.; Alessio R.; Zhao Z. (2007)
    Nanocomposite Ferroelectric Perovskites and Ionic Conductors by Colloidal Chemistry: Versatile Approach to the Synthesis of Functional Materials with Tailored Structures
    in European Congress on Advanced Materials and Processes - EuroMat 2007, Norimberga, Germania
    (literal)
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  • Buscaglia M. T.; Viviani M.; Buscaglia V.; Bassoli M.; Bassano A.; Nanni P.; Mitoseriu L.; Alessio R.; Zhao Z. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: European Congress on Advanced Materials and Processes - EuroMat 2007 (Norimberga, Germania, 10-13 Settembre 2007). Proceedings, pp. 37 - 37. DGM, 2007. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Dielectric and ferroelectric materials have important commercial applications such as multilayer ceramic capacitors, tunable microwave devices, underwater transducers, actuators, random access memories, thermistors with positive temperature coefficient of resistivity. Devices have continued to evolve in two primary directions: increased performances (higher capacitance, lower dielectric losses, better tunability, new functionalities, etc.) and smaller size (miniaturization). Fabrication of next generations of devices will require the synthesis of well dispersed, small and uniform particles, the realization of tailored microstructures, the control of grain size and grain boundary properties, the development of graded and composite structures. Several examples will be discussed to show the versatility of colloidal chemistry and precipitation techniques for the synthesis of single-phase and composite ferroelectric materials with tailored microstructures: porous SrTiO3 mesocrystals obtained in the presence of organic molecules, BaTiO3@SrTiO3 and BaTiO3@BaZrO3 core-shell particles, dielectric ceramics with local graded structure, BaCO3 nanocrystals coated with TiO2 as precursors for the solid-state synthesis of BaTiO3 nanopowders. Oxides with ionic or mixed conduction, such as Y-stabilized ZrO2 and (La,Sr)MnO3, are the reference materials for the fabrication of electrolyte layers and electrodes in solid-oxide fuel cells (SOFCs). Improved performances in SOFCs have been obtained by using porous composite materials, such as Y-ZrO2/Ni for the anode and Y-ZrO2/(La,Sr)MnO3 for the cathode. The properties of these composites can be optimized by tailoring their microstructure: size and morphology of the two solid phase, pore shape and pore size distribution, number of ternary (solid 1/solid 2/gas) contact points, connectivity of the three phases. Colloidal chemistry represents an alternative to more conventional techniques, such as mechanical mixing, impregnation, and decomposition of organometallic compounds, for the synthesis of composite particles and the fabrication of electrodes with peculiar microstructure. As an example, the decoration and coating of NiO microcrystals with Y-ZrO2 nanoparticles will be discussed in detail. (literal)
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  • Institute for Energetics and Interphases, National Research Council, via De Marini 6, I-16149 Genoa, Italy Department of Chemistry and Process Engineering, University of Genoa, P.le Kennedy 1, I-16149 Genoa, Italy Department of Solid State and Theoretical Physics, Al. I. Cuza University, Bv. Carol I 11, 700506 Iasi, Romania Solvay Bario e Derivati, Via degli Oliveti 84, I-54100 Massa, Italy Department of Inorganic Chemistry, University of Stockholm, S106 91 Stockholm, Sweden (literal)
Titolo
  • Nanocomposite Ferroelectric Perovskites and Ionic Conductors by Colloidal Chemistry: Versatile Approach to the Synthesis of Functional Materials with Tailored Structures (literal)
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