Abstract
Bulk samples of Ce1-xCoxO2 (x = 0.00 to 0.05) are prepared using solid state reaction technique. X-ray diffraction (XRD) results show a continuous decrease in the unit cell volume of Co doped CeO2 samples which indicates the substitutional doping of Co into the CeO2 lattice up to the doping concentration of x = 0.05. Field emission scanning electron microscopy (FESEM) images depict the formation of close packed particles of unusual morphology of size of 1–3 μm. X-ray absorption spectroscopy (XAS) at Ce M5,4 edge and Co L3,2 edge confirm the presence of Ce4+ and Co2+ ions, respectively. O K edge XAS conveys modification in electronic structure properties via formation of oxygen ion vacancies upon Co doping concentrations. Our results show that the observed large dielectric constants (ε′and ε'') and room temperature ferromagnetism are the intrinsic properties of the Co doped CeO2, which may offer this material in dielectric and magnetic devices applications.
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