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Sol–gel synthesis and optical behavior of Mg–Ce–O nano-crystallites

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Abstract

The Mg–Ce–O powder are shown to contain periclase-type MgO and/or fluoride-type cerium oxide (CeO2) depending upon the composition (x) defined by Ce/(Ce + Mg) atomic ratio. Lattice contraction of pariclase phase of MgO (average crystallite size ~8.8 nm) at Ce content of ‘x’ = 0.20 in comparison to pure MgO (crystallite size ~9.5 nm) has been realized due to oxygen vacancy formation. The optical band gap values of CeO2 varies (3.0–3.2 eV) due to oxygen vacancy formation in CeO2 phase, crystallite size and/or Ce3+/Ce4+ ratio. Further, the addition of Ce has shown to reduce the physisorption and chemisorption of water significantly as reflected by (1) suppression of related absorption peaks and (2) absence of magnesium hydroxide, Mg(OH)2, bands in Fourier transform infrared spectra.

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Acknowledgments

Authors thank Institute of Critical Technology and Applied Sciences (ICTAS), Virginia Tech, for providing Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy facilities. This work was supported in part by SERB, Government of India (SB/FTP/ETA-243/2012).

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Correspondence to Ashok Kumar or Jitendra Kumar.

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Kumar, A., Thota, S., Sivakumar, S. et al. Sol–gel synthesis and optical behavior of Mg–Ce–O nano-crystallites. J Sol-Gel Sci Technol 68, 46–53 (2013). https://doi.org/10.1007/s10971-013-3132-4

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  • DOI: https://doi.org/10.1007/s10971-013-3132-4

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