Abstract
Nanocrystalline Ceria (CeO2) was synthesized through auto-ignited combustion technique. The X-ray diffraction studies of CeO2 nanoparticles have shown that the as-prepared powder was single phase, crystalline and has a face centred cubic structure. The phase purity of the powder was further examined using Fourier Transform Infrared and Raman spectroscopic techniques. The transmission electron microscopic studies have shown that the particle size of the as prepared powder was in the range of 30–40 nm. The band gap of nanoparticles as calculated from the absorption spectrum was found to be 3.51 eV. The photoluminescent spectrum of the samples exhibited a number of emission peaks which forms a broad band emission between 400 and 500 nm originating from 2T2g(5d)–2F7/2, 2F5/2(4f) transition of Ce3+ ion due to spin–orbit coupling under the influence of O h crystal field. The nanopowders were sintered to about 95 % of the theoretical density at 1450 °C for 2 h. The microstructure of the sintered surface was examined using scanning electron microscopy. The dielectric constant (εr) and loss tangent (tanδ) at 5 MHz are found to be about 25.1 and 0.0118 respectively. The complex impedance plots show semicircular arcs resolving at high temperature which confirms the existence of the non-Debye type of relaxation in the sintered CeO2 samples.
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Acknowledgments
The authors H. Padma Kumar and Meenu Venugopal acknowledges the financial aid from Science & Engineering Research Board (SERB), Department of Science and Technology, Ministry of Science and Technology, Government of India under the scheme Fast Track Scheme for Young Scientists (SR/FTP/PS-070/2010).
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Venugopal, M., Saravana Kumar, S., Nissamudeen, K.M. et al. Optical and dielectric characterisation of Ceria nanocrystals synthesized by an auto-igniting combustion technique. J Mater Sci: Mater Electron 27, 9496–9502 (2016). https://doi.org/10.1007/s10854-016-5000-9
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DOI: https://doi.org/10.1007/s10854-016-5000-9