Effect of Co and Ni doping on structural, optical and vibrational properties of CeO 2

Abstract

Ce 0.975 A 0.025 O 2 (A=Co, Ni) was synthesized using sol-gel method. X-ray diffraction (XRD), UV-Vis and Raman spectroscopy are employed to evaluate structural, optoelectronic and vibrational properties of samples. XRD and Raman analysis confirms substitution of Co and Ni in CeO 2 host matrix. It is observed that Co doping cause more strain and structural disorder than Ni doping in CeO 2 . This is also reflected from crystallite size of samples. A broad Raman band emerges at ∼540-650 cm -1 indicating increase in oxygen vacancies with doping. X-ray absorption near edge structure (XANES) analysis estimates oxygen vacancies and valance state of Ce (Ce 3+ /Ce 4+ ) in CeO 2 . © 2019 Author(s).