http://www.cnr.it/ontology/cnr/individuo/prodotto/ID22146

Solid-State Synthesis of Nanocrystalline BaTiO3: Reaction Kinetics and Powder Properties (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Solid-State Synthesis of Nanocrystalline BaTiO3: Reaction Kinetics and Powder Properties (Articolo in rivista) (literal)

Anno

2008-01-01T00:00:00+01:00 (literal)

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

10.1111/j.1551-2916.2008.02576.x (literal)

Alternative label

Maria Teresa Buscaglia; Marta Bassoli; Vincenzo Buscaglia; Reinhard Vormberg (2008)
Solid-State Synthesis of Nanocrystalline BaTiO3: Reaction Kinetics and Powder Properties
in Journal of the American Ceramic Society (Online); Blackwell Publishing, Oxford (Regno Unito)
(literal)

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

Maria Teresa Buscaglia; Marta Bassoli; Vincenzo Buscaglia; Reinhard Vormberg (literal)

Pagina inizio

2862 (literal)

Pagina fine

2869 (literal)

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

http://puma.isti.cnr.it/linkres.php?resource=cnr.ieni/cnr.ieni.ge/2008-A0-011 (literal)

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

91 (literal)

Rivista

Journal of the American Ceramic Society (Rivista)

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

9 (literal)

Note

Scopu (literal)
ISI Web of Science (WOS) (literal)

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

Institute for Energetics and Interphases, National Research Council, I-16149 Genoa, Italy; Evonik Degussa GmbH, 63457 Hanau, Germany (literal)

Titolo

Solid-State Synthesis of Nanocrystalline BaTiO3: Reaction Kinetics and Powder Properties (literal)

Abstract

The formation of BaTiO3 nanoparticles by solid state reaction between nanocrystalline raw materials BaCO3 and TiO2 was studied as a function of temperature (400-800°C), time (1-24h) and titania particle size (15 and 30nm). The reaction starts at 500°C and a high reaction rate is already observed at 600°C for the finest titania, with up to 90% conversion after 2h. Two main reaction stages were observed at 600-700°C. The first step is dominated by nucleation and growth of BaTiO3 at the TiO2-BaCO3 contact points and at the TiO2 surface. Surface diffusion of BaCO3 is, most likely, the prevailing mass transport mechanism responsible for the rapid formation of BaTiO3, even in the absence of a significant contribution from lattice diffusion. The second stage begins when the residual TiO2 cores are completely covered by the product phase. For longer times, the reaction can only proceed by the slower lattice diffusion, resulting in a strong decrease of the reaction rate. Single phase BaTiO3 nanopowders with specific surface area of 12-15 m(2)/g, average particle size of 70-85 nm, relative density of 96.5%-98.3% and tetragonality of 1.005 were obtained by calcination at 700-800°C. Critical parameters in the preparation of ultrafine powders by solid-state reactions are the particle size of both raw materials, the absence of big hard agglomerates and the homogeneity of the mixture. The use of fine raw materials and optimization of the reaction conditions make mechanical activation unnecessary. (literal)

Editore