Properties of (x)CoFe2O4-(1-x)BiFeO3 multiferroic composites

Le Thi Mai Oanh, Nguyen Thi Huyen, Nguyen Van Minh

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Published Dec 15, 2011

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OANH, Le Thi Mai; HUYEN, Nguyen Thi; MINH, Nguyen Van. Properties of (x)CoFe2O4-(1-x)BiFeO3 multiferroic composites. VNU Journal of Science: Mathematics - Physics, [S.l.], v. 27, n. 4, dec. 2011. ISSN 2588-1124. Available at: <https://js.vnu.edu.vn/MaP/article/view/1532>. Date accessed: 27 apr. 2024.
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Vol 27 No 4
Section
Review Article

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Abstract

Abstract:  The crystal structure and optical as well as electromagnetic properties of multiferroic (x)CoFe2O4-(1-x)BiFeO3 (x=0.0÷0.5) composites prepared by solid state reaction method have been systematically investigated. The XRD analysis indicated that both spinel CoFe2O4 (CFO) and perovskite BiFeO3 (BFO) phase simultaneously exist in the sintered composite. Absorption spectra showed the optical band gap of these composites decreases slightly with the increase of CFO concentration. In the Raman spectra, the peaks showed the different weights of CFO phase respect to BFO phase. Magnetization curve showed the coercivity Hc value of composites increases with increasing the CFO concentration and achieves the highest squreness Mr/Hc of about  11.12 % with x=0.4. The impedance spectroscopy of CFO-BFOcomposites exhibited that the strong dielectric property of composite was still well maintained with x=0.4. These results suggest that the electromagnetic property of CFO-BFO composite is optimized with x of about 0.4.

Keywords: Multiferroic, composites, perovskite, spinel, impedance

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