Hysteretic Magnetoelectric Behavior of CoFe2O4–BaTiO3 Composites Prepared by Reductive Sintering and Reoxidation

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

8 Pages Posted: 29 Aug 2017

See all articles by Till Walther

Till Walther

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Ulrich Straube

Martin Luther University of Halle-Wittenberg - Institute of Physics

Roberto Köferstein

Martin Luther Universitat Halle Wittenberg

Stefan Ebbinghaus

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Date Written: March 8, 2016

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 1C. 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 1C 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 aME maxima dependent on the Hdc field sweep direction. The sample with x = 0.4 exhibits the highest maximum aME of 420 mV Oe-1 cm-1.

Keywords: composite, permittivity, BaTiO3, ferrite, magnetoelectric, multiferroic, magnetization, CoFe2O4

JEL Classification: Y90

Suggested Citation

Walther, Till and Straube, Ulrich and Köferstein, Roberto and Ebbinghaus, Stefan, Hysteretic Magnetoelectric Behavior of CoFe2O4–BaTiO3 Composites Prepared by Reductive Sintering and Reoxidation (March 8, 2016). J.Mater. Chem. C, 2016, 4, 4792 , Available at SSRN: https://ssrn.com/abstract=3026166

Till Walther

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Halle (Saale), Saxony-Anhalt 06108
Germany

Ulrich Straube

Martin Luther University of Halle-Wittenberg - Institute of Physics

von Danckelmann Platz 3,
06120 Halle
Germany

Roberto Köferstein (Contact Author)

Martin Luther Universitat Halle Wittenberg ( email )

Universitätsplatz 10
Halle (Saale), Saxony-Anhalt 06108
Germany

Stefan Ebbinghaus

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry ( email )

Halle (Saale), Saxony-Anhalt 06108
Germany

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