The influence of preparation technique on the grain size and electrical properties of CeO2/ZnO nanocomposites

Salama, A. H.; Ahmed, Aya; Abdelkhalek, Ahmed; Fathi, Ahlam M.

doi:10.1007/s00339-021-04484-y

Cited by 2 publications

(2 citation statements)

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“…The variation of the dielectric constant as a function of temperature for cerium oxide nanoparticles is shown in Figure 7b at a frequency of 1 kHz. The CO-2 sample presented a dielectric band centered around 40 • C, while the CeO-1 sample revealed two bands, one around 30 • C and a supplementary one at 115 • C. Such peaking behavior of the dielectric constant has been reported in few cases in the literature for cerium oxide nanostructures and revealed the presence of a dielectric relaxation mechanism [66,68]. However, this behavior was not noticed for other cerium oxide nanostructures [23].…”

Section: Dielectric Behaviormentioning

confidence: 78%

“…It can be noted that the inhomogeneities formed in cerium oxide nanostructures (oxygen vacancies, grain boundary defects or surface defects) can enhance the polarization degree and the ε value. Additionally, the dielectric properties can be influenced by changing oxidation states of cerium, i.e., between 3+ and 4+, creating different amounts of dipole moments [29,[66][67][68]. In the high frequency region, the effect of space charge polarization was strongly diminished, revealing a slight decrease of ε with increasing frequency.…”

Section: Dielectric Behaviormentioning

confidence: 99%

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Investigating the Vibrational, Magnetic and Dielectric Properties, and Antioxidant Activity of Cerium Oxide Nanoparticles

Fifere¹,

Airinei²,

Asăndulesa³

et al. 2022

IJMS

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Dielectric, magnetic and Raman measurements of cerium oxide nanoparticles obtained by the precipitation method are discussed. Morphological study was performed by scanning electron microscopy, confirming the formation of nanoparticles of 5–27 nm. The Raman spectra exhibited a strong band around 465 cm−1, corresponding to the symmetrical stretching mode of the Ce-O8 vibrational unit. The nature of the room temperature ferromagnetism of cerium oxide nanoparticles was analyzed, taking into account the oxygen defects at the surface or interface of the nanoparticles. The evolution of dielectric constant, ε′, and dielectric loss, ε″ was studied as a function of frequency at different temperatures. Additionally, the variation of the electric conductivity versus temperature was investigated. Finally, complex impedance study of the cerium oxide nanoparticles was performed.

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Section: Dielectric Behaviormentioning

confidence: 78%