Dielectrical Properties of CeO2 Nanoparticles at Different Temperatures


A template-free precipitation method was used as a simple and low cost method for preparation of CeO2 nanoparticles. The structure and morphology of the prepared nanoparticle samples were studied in detail using X-ray diffraction, Raman spectroscopy and Scanning Electron Microscopy (SEM) measurements. The whole powder pattern modelling (WPPM) method was applied on XRD data to accurately measure the crystalline domain size and their size distribution. The average crystalline domain diameter was found to be 5.2 nm, with a very narrow size distribution. UV-visible absorbance spectrum was used to calculate the optical energy band gap of the prepared CeO2 nanoparticles. The FT-IR spectrum of prepared CeO2 nanoparticles showed absorption bands at 400 cm(-1) to 450 cm(-1) regime, which correspond to CeO2 stretching vibration. The dielectric constant (er) and dielectric loss (tan delta) values of sintered CeO2 compact consolidated from prepared nanoparticles were measured at different temperatures in the range from 298 K (room temperature) to 623 K, and at different frequencies from 1 kHz to 1 MHz.




Science & Technology - Other Topics


Zamiri, R; Ahangar, HA; Kaushal, A; Zakaria, A; Zamiri, G; Tobaldi, D; Ferreira, JMF

nossos autores


Reza Zamiri would like to thank the Foundation for Science and Technology of Portugal (FCT) and Universiti Putra Malaysia Postdoctoral research fellow program (Reza Zamiri) for the financial support under the grant references, SFRH/BPD/76185/2011 and NSR-8978 (G. P. D.). Ajay Kaushal thanks the financial support under the grant references SFRH/BPD/77598/2011 from the Foundation for Science and Technology of Portugal (FCT). David M. Tobaldi is grateful to the ECO-SEE project (funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no 609234. Note: The views expressed are purely those of the authors and may not in any circumstances be regarded as stating an official position of the European Commission). The authors would also like to thank CICECO for the work at the University of Aveiro.

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