http://www.cnr.it/ontology/cnr/individuo/prodotto/ID22133

Ferroelectric hollow particles obtained by solid-state reaction (Articolo in rivista)

Type

Label

Ferroelectric hollow particles obtained by solid-state reaction (Articolo in rivista) (literal)

Anno

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Alternative label

Maria Teresa Buscaglia; Vincenzo Buscaglia; Massimo Viviani; Giovanni Dondero; Serge Röhrig; Andreas Rüdiger; Paolo Nanni (2008)
Ferroelectric hollow particles obtained by solid-state reaction
in Nanotechnology (Bristol, Online); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Maria Teresa Buscaglia; Vincenzo Buscaglia; Massimo Viviani; Giovanni Dondero; Serge Röhrig; Andreas Rüdiger; Paolo Nanni (literal)

Pagina inizio

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http://puma.isti.cnr.it/linkres.php?resource=cnr.ieni/cnr.ieni.ge/2008-A0-014 (literal)

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Rivista

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Note

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Institute of Energetics and Interphases, National Research Council, Via De Marini 6, I-16149 Genoa, Italy; Institute for Macromolecular Studies, National Research Council, Via De Marini 6, I-16149 Genoa, Italy; Institute of Solid State Research, Centre of Nanoelectronic Systems for Information Technology, Research Centre Jülich, 52425 Jülich, Germany; Department of Process and Chemical Engineering, University of Genoa, Piazzale Kennedy 1, I-16129 Genoa, Italy (literal)

Titolo

Abstract

Hollow particles of barium titanate were obtained by a two-step process combining colloidal chemistry and solid-state reaction. BaCO3 crystals (size ~1µm) suspended in a peroxy-Ti(IV) aqueous solution were coated with an amorphous TiO2 shell using a precipitation process. Calcination of the BaCO3@TiO2 core-shell particles at 700 °C resulted in the formation of BaTiO3 hollow particles (shell thickness of ~70 nm) which retain the morphology of the BaCO3 crystals. Formation of the cavity occurs because out-diffusion of the core phase is much faster than in-diffusion of the shell material. X-ray diffraction (XRD) and Raman spectroscopy indicate that the hollow particles possess a tetragonal ferroelectric structure with axial ratio c/a = 1.005. Piezoresponse force microscopy has shown strong piezoactivity and 180° ferroelectric domains. The process described provides a general route to fabricate hollow ferroelectric structures of several compounds. (literal)

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