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Novel magnetoelectric ceramic composites by control of the interface reactions in Fe2O3@BaTiO3 core-shell structures (Articolo in rivista)

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Novel magnetoelectric ceramic composites by control of the interface reactions in Fe2O3@BaTiO3 core-shell structures (Articolo in rivista) (literal)

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Alternative label

Curecheriu L.; Postolache P.; Buscaglia M.T.; Buscaglia V.; Ianculescu A.; Mitoseriu L. (2014)
Novel magnetoelectric ceramic composites by control of the interface reactions in Fe2O3@BaTiO3 core-shell structures
in Journal of applied physics; AMER INST PHYSICS, MELVILLE, NY 11747-4501 USA (Stati Uniti d'America)
(literal)

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Curecheriu L.; Postolache P.; Buscaglia M.T.; Buscaglia V.; Ianculescu A.; Mitoseriu L. (literal)

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http://scitation.aip.org/content/aip/journal/jap/116/8/10.1063/1.4893896 (literal)

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Note

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1,2,6 : Department of Physics, Al. I. Cuza University, Bld. Carol I no. 11, Iasi 700506, Romania / 3,4 : Institute of Energetics and Interphases CNR, via de Marini no. 6, I-16149 Genoa, Italy / 5 : Polytechnics Univ. of Bucharest, 1-7 Gh. Polizu, 011061 Bucharest, Romania (literal)

Titolo

Novel magnetoelectric ceramic composites by control of the interface reactions in Fe2O3@BaTiO3 core-shell structures (literal)

Abstract

In the present work, composite ceramics of ferroelectric BaTiO3 (BT) with magnetic alpha Fe2O3 were prepared from powders synthesized by two different methods: (a) core-shell powders of Fe2O3@BT and (b) Fe2O3-BT composites from mixed powders with the same composition. The M(H) loops at room temperature show a \"wasp-waisted\" character, with multiple components, determined as result of the formation of magnetic phases with contrasting coercivities (hard BaFe12O19 and soft Ba12Ti28Fe15O84 phases) in different ratios, as indicated by the magnetic first-order-reversal curves analysis. The core-shell composite ceramics generally showed slightly improved dielectric properties and smaller conductivity. The high field properties of composite ceramics show a strong nonlinearity in both cases, together with a reduction of zero field permittivity, making from these composites possible tunable materials interesting for applications. Their multifunctional character is enhanced by the presence of a complex magnetic character with soft/hard components. (c) 2014 AIP Publishing LLC. (literal)

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