Preparation and characterisation of the magneto-electric xBiFeO3-(1 − x)BaTiO3 ceramics (Articolo in rivista)

Type
Label
  • Preparation and characterisation of the magneto-electric xBiFeO3-(1 − x)BaTiO3 ceramics (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Buscaglia M. T.; Mitoseriu L.; Buscaglia V.; Pallecchi I.; Viviani M.; Nanni P.; Siri A. S. (2006)
    Preparation and characterisation of the magneto-electric xBiFeO3-(1 − x)BaTiO3 ceramics
    in Journal of the European Ceramic Society
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Buscaglia M. T.; Mitoseriu L.; Buscaglia V.; Pallecchi I.; Viviani M.; Nanni P.; Siri A. S. (literal)
Pagina inizio
  • 3027 (literal)
Pagina fine
  • 3030 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 26 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: Journal of the European Ceramic Society, vol. 26 (14) pp. 3027-3030. Elsevier science, 2006. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Preparation and characterisation of the magneto-electric xBiFeO3-(1 − x)BaTiO3 ceramics (literal)
Abstract
  • The solid solutions of BiFeO3-BaTiO3 have been prepared via solid state with a view to obtaining magnetoelectric properties, i.e. ferroelectric and magnetic activity in the same range of temperatures. Optimum calcination and sintering strategy for obtaining pure perovskite phase, dense ceramics (97% relative density) and homogeneous microstructures have been determined. The sample of composition 0.7BiFeO3-0.3BaTiO3 reported in the present work is pseudo-cubic at room temperature. The permittivity is ?r 150 at the room temperature and shows a broad ferro-para phase transition at around 175 °C where ?r 1600. This diffuse maximum of the permittivity, similar to that in relaxors, is due to the chemical inhomogeneity in both A and B sites of the perovskite unit cell ABO3. Higher losses, tan δ 1, appear above 200 °C and other different conduction mechanisms start to be active particularly at temperatures higher than 400 °C, when the ceramic becomes conductive. The magnetic properties show a succession of transitions from weak ferro/ferrimagnetism-to-antiferromagnetism and antiferromagnetism-to-paramagnetism at TN1 10 K and TN2 265 K. Below TN2 the ceramic 0.7BiFeO3-0.3BaTiO3 can present magnetoelectric coupling, due to the fact that is simultaneously ferroelectric and antiferromagnetic. (literal)
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