http://www.cnr.it/ontology/cnr/individuo/prodotto/ID168730

Grain size and grain boundary-related effects on the properties of nanocrystalline barium titanate ceramics (Articolo in rivista)

Type

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

Label

Grain size and grain boundary-related effects on the properties of nanocrystalline barium titanate ceramics (Articolo in rivista) (literal)

Anno

2006-01-01T00:00:00+01:00 (literal)

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

10.1016/j.jeurceramsoc.2006.02.005 (literal)

Alternative label

V. Buscaglia; M.T. Buscaglia; M. Viviani; L. Mitoseriu; P. Nanni; V. Trefiletti; P. Piaggio; I. Gregora; T. Ostapchuk; J. Pokorný; J. Petzelt (2006)
Grain size and grain boundary-related effects on the properties of nanocrystalline barium titanate ceramics
in Journal of the European Ceramic Society; Elsevier Science Ltd., Oxford (Regno Unito)
(literal)

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

V. Buscaglia; M.T. Buscaglia; M. Viviani; L. Mitoseriu; P. Nanni; V. Trefiletti; P. Piaggio; I. Gregora; T. Ostapchuk; J. Pokorný; J. Petzelt (literal)

Pagina inizio

2889 (literal)

Pagina fine

2898 (literal)

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

http://puma.isti.cnr.it/linkres.php?resource=cnr.ismac/cnr.ismac.ge/2006-A0-014 (literal)

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

26 (literal)

Rivista

Journal of the European Ceramic Society (Rivista)

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

In: Journal of the European Ceramic Society, vol. 26 (14) pp. 2889-2898. Elsevier, 2006. (literal)

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

14 (literal)

Note

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

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

Institute for Energetics and Interphases, National Research Council, Via de Marini 6, Genoa I-16149, Italy; Department Chemical and Process Engineering, University of Genoa, P-le Kennedy 1, Genoa I-16129, Italy; Department of Solid State and Theoretical Physics, Al. I. Cuza University, Bv. Carol I 11, Iasi 700506, Romania; Institute of Macromolecular Materials, Department of Genoa, National Research Council, Via De Marini 6, Genoa I-16149, Italy; Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, Genoa I-16146, Italy (literal)

Titolo

Grain size and grain boundary-related effects on the properties of nanocrystalline barium titanate ceramics (literal)

Abstract

Dense nanocrystalline BaTiO3 ceramics with grain size (GS) down to 50 nm were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), impedance spectroscopy and Raman spectroscopy. A continuous reduction of the tetragonal distortion towards the pseudo-cubic state was obtained when the GS was reduced. Therefore, even the finest structure (ceramic with average GS of 50 nm) is still non-centrosymmetric. The dielectric constant (K) shows relative thermal stability in a large range of temperatures and is strongly depressed in the nanocrystalline ceramics, in comparison with the micrometric ones (K being below 1000 for the ceramic with 50 nm GS). The losses are smaller than 5% in the frequency range of 10(2)-10(6) Hz and temperatures below 200 °C. As the GS decreases, the structural phase transitions assume a more diffuse character. A decrease of the Curie temperature with reducing the GS was confirmed by X-ray, calorimetric and permittivity data. The Raman spectra collected for the range 80-800 K provided evidence for the presence of all the crystalline phases of BaTiO3, as in single-crystal and micrometric ceramics; a few differences can be attributed to GS effects and to the high density of the non-ferroelectric grain boundaries. Evidence for the different phase transitions were provided by the disappearance of some bands and by anomalies in positions and intensities of selected Raman modes. The overall properties of the nanocrystalline BaTiO3 ceramics can be explained as a combination of intrinsic effects, associated with the decrease of tetragonality and heat of transition with reducing GS, and extrinsic contributions due to the non-ferroelectric grain boundaries causing a \"dilution\" of the ferroelectric properties. (literal)

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