Multiferroic properties of the biphasic composite 0.8BaTiO3-0.2CoFe2O4 obtained thru asisted machanosynthesis.
Abstract
Multiferroic materials simultaneously exhibit ferroelectric and ferromagnetic orders, which make them highly interesting from the technological perspective. However, there is only one known room temperature monophasic multiferroic material, the bismuth ferrite (BiFeO3). An alternative to the single phase multiferroics is the development biphasic multiferroic materials, with a ferromagnetic and a ferroelectric phase. In the present work the multiferroic characterization of the composite 0.8BaTiO3-0.2CoFe2O4 obtained thru thermal treatment assisted high energy ball milling is reported. Proportional adequate amounts of BaTiO3 and CoFe2O4 were mixed in a high ball energy mill SPEX 8000D during 2 minutes, with a ball to powder ratio of 60:1 in an oxidizing atmosphere (air). The mixture was uniaxial pressed at 800 MPa followed by a sintering process at 1300 ˚C during 2 h. The DRX results confirm the presence of the ferroioc phases BaTiO3 and CoFe2O4, without evidence of chemical interaction between them. The dielectric characterization shows a typical behavior of a ferroelectric material with a relative permittivity of 400 at 1MHz. The vibrating sample magnetometry analysis showed a ferrimagnetic behavior, similar to that exhibited by the cobalt ferrite, with the particularity of a lower remanent magnetization (11.5 emu/g), due to the proportion of the ferrite present in the composite. The dielectric and magnetic results demonstrate the multiferroic character of the composite.
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