Abstract
In this work, multiferroic composites were produced from CoFe2O4 and KNbO3 mixtures via control of the heat treatment temperature. For this, CoFe2O4 nanoparticles were produced by sol-gel method, while KNbO3 was synthesized by microwave-assisted hydrothermal synthesis. The powders were homogenized and subjected to heat treatment at 300, 400 and 500 °C for 5 h. The structural, electrical and magnetic properties were characterized. The results of X-ray diffraction indicated that there was no formation of secondary phases with heat treatment. Raman vibrational modes confirmed the presence of KNbO3 and CoFe2O4 in the prepared composites. SEM analysis showed that the composite microstructure consists of smaller ferrite particles arranged on the surface of largest cubic KNbO3 particles. The improvement of coercivity (HC = 382.1Oe) and dielectric constant (ϵ’~7860) was observed for the composite thermally treated at 300 °C. The obtained results show the potential application of KN:CFO composites for multifunctional devices.
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