Abstract
Multiferroic (1-x)KNbO3-(x)CoFe2O4 (x = 0.0, 0.25, 0.5, 0.75 and 1.0 mol) composites were prepared by solid state reaction method. X-ray diffraction results showed that the prepared (1-x)KNbO3-(x)CoFe2O4 composites belong to orthorhombic system for x = 0.0 (perovskite KNbO3), cubic system for x = 1.0 (spinel CoFe2O4) and mixed phase of KNbO3 and CoFe2O4 for x = 0.25, 0.5 and 0.75. Nb-O and Fe-O stretching vibrational modes were observed in the Fourier transform and Raman spectral analyses, respectively. The HR-SEM analysis showed that the morphology of KNbO3 and CoFe2O4 composites was significantly modified by CoFe2O4 content. Energy dispersive X-ray spectroscopy results confirmed the presence of K, Nb, Fe, Co and O in (1-x)KNbO3-(x)CoFe2O4 composites. The ionic state of Nb, Co, Fe and O was examined by X-ray photoelectron spectroscopy analysis. The high value of coercivity (Hc = ∼981Oe) for x = 0.5 and the enhanced dielectric constant for x = 0.5 and 0.75 were observed.
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