title: Dielectrical Properties of CeO2 Nanoparticles at Different Temperatures.
abstract: 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 (εr) and dielectric loss (tan δ) 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.
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal.
authors.forename: Reza
authors.initials: R
authors.lastname: Zamiri
authors.affiliation: Department of Chemistry, Faculty of Science, Islamic Azad University, Najafabad Branch, Najafabad, Isfahan, Iran.
authors.forename: Hossein Abbastabar
authors.initials: HA
authors.lastname: Ahangar
authors.affiliation: Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal.
authors.forename: Ajay
authors.initials: A
authors.lastname: Kaushal
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Azmi
authors.initials: A
authors.lastname: Zakaria
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Golnoosh
authors.initials: G
authors.lastname: Zamiri
authors.affiliation: Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal.
authors.forename: David
authors.initials: D
authors.lastname: Tobaldi
authors.affiliation: Department Materials and Ceramic Engineering (DEMaC), CICECO, University of Aveiro, Campus Santiago, 3810-193, Aveiro, Portugal.
authors.forename: J M F
authors.initials: JM
authors.lastname: Ferreira
mesh_terms: D002563:Cerium / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D013059:Spectrum Analysis, Raman; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D002563:Cerium; C030583:ceric oxide