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- W1988430699 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 ɛr ≈ 150 at the room temperature and shows a broad ferro-para phase transition at around 175 °C where ɛr ≈ 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." @default.
- W1988430699 created "2016-06-24" @default.
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- W1988430699 date "2006-01-01" @default.
- W1988430699 modified "2023-10-18" @default.
- W1988430699 title "Preparation and characterisation of the magneto-electric xBiFeO3–(1−x)BaTiO3 ceramics" @default.
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- W1988430699 doi "https://doi.org/10.1016/j.jeurceramsoc.2006.02.023" @default.
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