Hysteretic magnetoelectric behavior of CoFe2O4–BaTiO3 composites prepared by reductive sintering and reoxidation

Till Walther; Ulrich Straube; Roberto Köferstein; Stefan G. Ebbinghaus

doi:10.1039/C6TC00995F

Hysteretic magnetoelectric behavior of CoFe₂O₄–BaTiO₃ composites prepared by reductive sintering and reoxidation

Till Walther,

^a Ulrich Straube,^b Roberto Köferstein^a and Stefan G. Ebbinghaus*^a

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* Corresponding authors

^a Institute of Chemistry, Inorganic Chemistry, Martin Luther University Halle-Wittenberg, Kurt Mothes Strasse 2, 06120 Halle, Germany
E-mail: stefan.ebbinghaus@chemie.uni-halle.de
Fax: +49-345-5527028
Tel: +49-345-5525870

^b Institute of Physics, Martin Luther University Halle-Wittenberg, von Danckelmann Platz 3, 06120 Halle, Germany

Abstract

Magnetoelectric composites (CoFe₂O₄)_x–(BaTiO₃)_1−x with x = 0.1, 0.2, 0.3, 0.4 and 0.5 were prepared by a polyol mediated synthesis route. The densification step was performed in a reducing forming gas atmosphere at 1250 °C. Under these conditions Co²⁺ and Fe³⁺ are reduced to the corresponding metals and thus a reaction of these elements with the BaTiO₃ matrix is prevented. Reoxidation in air to CoFe₂O₄ at a rather low temperature of 800 °C leads to samples free of secondary phases. While the course of the synthesis was monitored by TGA, XRD and photometric analysis, the final composites were characterized via SEM, EDX, impedance spectroscopy and magnetic and magnetoelectric (ME) measurements. All samples show pronounced ME hystereses and α_ME maxima dependent on the H_dc field sweep direction. The sample with x = 0.4 exhibits the highest maximum α_ME of 420 μV Oe⁻¹ cm⁻¹.

This article is part of the themed collection: 2016 Journal of Materials Chemistry C Hot Papers

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https://doi.org/10.1039/C6TC00995F

Article type

Paper

Submitted

08 Mar 2016

Accepted

14 Apr 2016

First published

15 Apr 2016

This article is Open Access

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J. Mater. Chem. C, 2016,4, 4792-4799

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Hysteretic magnetoelectric behavior of CoFe₂O₄–BaTiO₃ composites prepared by reductive sintering and reoxidation

T. Walther, U. Straube, R. Köferstein and S. G. Ebbinghaus, J. Mater. Chem. C, 2016, 4, 4792 DOI: 10.1039/C6TC00995F

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Journal of Materials Chemistry C

Hysteretic magnetoelectric behavior of CoFe₂O₄–BaTiO₃ composites prepared by reductive sintering and reoxidation

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Hysteretic magnetoelectric behavior of CoFe₂O₄–BaTiO₃ composites prepared by reductive sintering and reoxidation

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