Ferroelectric nanopowders and nanostructures by solid-state reaction. Microstructure control through nanoscale engineering (Abstract/Comunicazione in atti di convegno)

Type
Label
  • Ferroelectric nanopowders and nanostructures by solid-state reaction. Microstructure control through nanoscale engineering (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • Buscaglia V.; Buscaglia M. T.; Bassano A.; Kalyani V.; Nanni P. (2010)
    Ferroelectric nanopowders and nanostructures by solid-state reaction. Microstructure control through nanoscale engineering
    in Third International Congress on Ceramics, Osaka, Giappone
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Buscaglia V.; Buscaglia M. T.; Bassano A.; Kalyani V.; Nanni P. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: ICC3 - Third International Congress on Ceramics (Osaka, Giappone, 14-18 November 2010). Abstract, article n. 675. Ceramic Society of Japan, 2010. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Barium titanate, BaTiO3, is an important dielectric and ferroelectric material widely used for the fabrication of multilayer ceramic capacitors (MLCCs) and other electronic components. MLCCs have continued to evolve in two primary directions: smaller size (miniaturization) and larger capacitance values. The fabrication of very thin dielectric layers with thickness 1 μm will require well dispersed and uniform particles with a size of the order of 100 nm. The MLCC market is nowadays very competitive and the passive components companies are looking for less expensive powder synthesis methods, such as the solid-state reaction between BaCO3 and TiO2. Solid-state BaTiO3 nanopowders can be obtained by lowering the reaction temperature below 800°C, thus avoiding coarsening and aggregation phenomena. This result can be attained by using very fine, high-quality raw materials in a conventional mixing and firing process. Critical parameters are the homogeneity of the mixture and the particle size of both raw materials. A more general approach for the preparation of nanostructures with different dimensionality and size is by means of suitable reactive templates. For example, BaTiO3 nanowires can be obtained first by coating TiO2 needles with nanocrystalline BaCO3 and then annealing the templates at 700°C. Nanoparticles, hollow particles, nanowires and nanoplatelets of BaTiO3 and Bi4Ti3O12 can be prepared using different templates with core-shell structure. This two-phase arrangement maximizes the contact area and minimizes the diffusion distances, resulting in lower reaction temperatures and homogeneous morphologies. The morphology and crystallographic order of the final particles is determined by the shape of the template, the reaction mechanism, the occurrence of a topochemical reaction, the development of Kirkendall porosity and the relative importance of volume and surface diffusion. Therefore the design and use of reactive templates represents an effective approach for (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-IENI, Genova, DICHEP, University of Genoa, P.le Kennedy, Fiera del Mare, I-16129 Genoa, Italy (literal)
Titolo
  • Ferroelectric nanopowders and nanostructures by solid-state reaction. Microstructure control through nanoscale engineering (literal)
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:


Autore CNR di
Prodotto
Insieme di parole chiave di
data.CNR.it