High dielectric constant and frozen macroscopic polarization in dense nanocrystalline (30nm) BaTiO3 ceramics (Articolo in rivista)

Type
Label
  • High dielectric constant and frozen macroscopic polarization in dense nanocrystalline (30nm) BaTiO3 ceramics (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.73.064114 (literal)
Alternative label
  • M. T. Buscaglia 1, M. Viviani 1, V. Buscaglia 1, L. Mitoseriu 2,3, A. Testino 1,3, P. Nanni 1,3, Z. Zhe 4, M. Nygren 4, C. Harnagea5, D. Piazza 6 and C. Galassi 6 (2006)
    High dielectric constant and frozen macroscopic polarization in dense nanocrystalline (30nm) BaTiO3 ceramics
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. T. Buscaglia 1, M. Viviani 1, V. Buscaglia 1, L. Mitoseriu 2,3, A. Testino 1,3, P. Nanni 1,3, Z. Zhe 4, M. Nygren 4, C. Harnagea5, D. Piazza 6 and C. Galassi 6 (literal)
Pagina inizio
  • 064114-1 (literal)
Pagina fine
  • 064114-10 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 73 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 6 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Institute for Energetics and Interphases, Department of Genoa, National Research Council, Via de Marini 6, I-16149 Genoa, Italy 2 Department of Solid State and Theoretical Physics, Al. I. Cuza University, Bv. Carol I 11, 700506 Iasi, Romania 3 Department of Chemical and Process Engineering, University of Genoa, Piazzale Kennedy, I-16129 Genoa, Italy 4 Department of Inorganic Chemistry, University of Stockholm, S-106 91 Stockholm, Sweden 5 INRS-Energie, Matériaux et Telécommunications, University of Québec, 1650 Lionel-Boulet, Varennes, Quebec, Canada J3X 1S2 6 Institute of Science and Technology for Ceramics, Via Granarolo 64, I-48018 Faenza, Italy (literal)
Titolo
  • High dielectric constant and frozen macroscopic polarization in dense nanocrystalline (30nm) BaTiO3 ceramics (literal)
Abstract
  • Theoretical models for small ferroelectric particles predict a progressive decrease of the Curie temperature, spontaneous lattice strain, and polarization until the critical size corresponding to transition to the cubic phase and disappearance of ferroelectricity is reached. In contrast, the behavior of nanocrystalline BaTiO3 ceramics with a grain size of _30 nm is dominated by extrinsic effects related to the grain boundaries which mask the expected downscaling of properties. While the noncubic crystal structure, the high dielectric constant __1600_ and the variation of permittivity with temperature suggest a ferroelectric behavior, very slim, and nearly linear polarization hysteresis loops are observed. Evidence for the existence of a ferroelectric domain structure with domains extending over several grains and of polarization switching at local scale is given by piezoresponse force microscopy. The suppression of macroscopic ferroelectric hysteresis and switching originates from a frozen domain structure stable under an external field owing to the effects exerted by the grain boundaries, such as the clamping of the domain walls and the hindrance of polarization switching. Furthermore, the depolarization field originated by the low-permittivity nonferroelectric grain boundaries can cause a significant reduction of polarization. If the grain size is small enough, the ceramic is expected to undergo a “phase transition” to a polar phase with nonswitchable polarization. The BaTiO3 ceramics with grain size of 30 nm investigated in the present study are deemed to be close to this transition. (literal)
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