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Preparation and characterisation of the magneto-electric xBiFeO(3)-(1-x)BaTiO3 ceramics (Articolo in rivista)

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Preparation and characterisation of the magneto-electric xBiFeO(3)-(1-x)BaTiO3 ceramics (Articolo in rivista) (literal)

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Maria Teresa Buscaglia; Liliana Mitoseriu; Vincenzo Buscaglia; Ilaria Pallecchi; Massimo Viviani; Paolo Nanni; Antonio Sergio Siri (2006)
Preparation and characterisation of the magneto-electric xBiFeO(3)-(1-x)BaTiO3 ceramics
in Journal of the European Ceramic Society; Elsevier Science Ltd., Oxford (Regno Unito)
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Maria Teresa Buscaglia; Liliana Mitoseriu; Vincenzo Buscaglia; Ilaria Pallecchi; Massimo Viviani; Paolo Nanni; Antonio Sergio Siri (literal)

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Institute for Energetics & Interphases--CNR, Via de Marini 6, Genoa I-16149, Italy; Department Chemical & Process Engineering, University of Genoa, P-le Kennedy 1, I-16129 Genoa, Italy; Department of Solid State & Theoretical Physics, Al. I. Cuza University, Bv. Carol I 11, Iasi 700506, Romania; Physics Department & INFM, University of Genoa, Via Dodecaneso 33, I-16146 Genoa, Italy (literal)

Titolo

Preparation and characterisation of the magneto-electric xBiFeO(3)-(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 epsilon(r) ~150 at the room temperature and shows a broad ferro-para phase transition at around 175 °C where epsilon(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 delta > 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 anti ferromagnetism-to-paramagnetism at T-NI ~10 K and T-N2 ~265 K. Below T-N2 the ceramic 0.7BiFeO3-0.3BaTiO3 can present magnetoelectric coupling, due to the fact that is simultaneously ferroelectric and anti ferromagnetic. (literal)

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