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Synthesis of BaTiO3 Core-Shell Particles and Fabrication of Dielectric Ceramics with Local Graded Structure (Articolo in rivista)

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Synthesis of BaTiO3 Core-Shell Particles and Fabrication of Dielectric Ceramics with Local Graded Structure (Articolo in rivista) (literal)

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Alternative label

Maria Teresa Buscaglia; Massimo Viviani; Zhe Zhao; Vincenzo Buscaglia; Paolo Nanni (2006)
Synthesis of BaTiO3 Core-Shell Particles and Fabrication of Dielectric Ceramics with Local Graded Structure
in Chemistry of materials (Online); ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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Maria Teresa Buscaglia; Massimo Viviani; Zhe Zhao; Vincenzo Buscaglia; Paolo Nanni (literal)

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Rivista

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In: Chemistry of Materials, vol. 18 (17) pp. 4002-4010. American Chemical Society, 2006. (literal)

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Institute for Energetics and Interphases, National Research Council, via De Marini 6, I-16149 Genoa, Italy; Department of Inorganic Chemistry, University of Stockholm, S106 91 Stockholm, Sweden; Department of Process and Chemical Engineering, University of Genoa, P. le Kennedy, Fiera del Mare, Pad. D, I-16129 Genoa, Italy (literal)

Titolo

Synthesis of BaTiO3 Core-Shell Particles and Fabrication of Dielectric Ceramics with Local Graded Structure (literal)

Abstract

The coating of BaTiO3 particles with a different perovskite and the subsequent consolidation to dense ceramics retaining a radial composition gradient within the single grains are presented and discussed. A shell of SrTiO3 or BaZrO3 was directly grown on the surface of BaTiO3 spherical templates suspended in aqueous solution by means of a precipitation process making use of inorganic precursors. The overall composition and the particle size can be tailored over a wide range. Densification of the resulting coreshell particles was realized using spark plasma sintering or conventional sintering. Dense ceramics with locally graded structure can be only obtained by a careful choice of the sintering conditions, that is, controlling the interdiffusion between core and shell. The final materials show strongly modified dielectric properties in comparison to both the parent compounds and the homogeneous solid solutions. The proposed approach is generic and suggests a new avenue to create functional and structural polycrystalline materials with locally graded structure by the controlled sintering of core-shell particles. (literal)

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