Dielectric relaxation, AC conductivity behavior and its relation to microstructure in mechanochemically synthesized Mn-doped CeO2 nanocrystals

Dhara, Arup; Sain, Sumanta; Maji, Prasenjit; Das, Sachindranath; Pradhan, S.K.

doi:10.1016/j.solidstatesciences.2018.11.009

Cited by 12 publications

(3 citation statements)

References 48 publications

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“…Similar frequency dependences of the dielectric constant have been reported elsewhere [9,25,64]. At low frequencies, as the temperature increased, the dielectric constant increased, and at high frequencies, ε remained practically at a constant value (Figure 6) due to the conductivity enhancement and higher charge carrier mobility [10]. Considering the ε (f) spectra of cerium oxide nanoparticles selected at room temperature, we noticed that the effect of the space charge polarization was more pronounced for the CeO-1 sample, while the magnitude of ε was comparable for both samples, suggesting a similar dipolar activity (Figure 7a).…”

Section: Dielectric Behaviorsupporting

confidence: 84%

“…Nowadays, cerium oxide is among the most promising transition metal oxides for various applications as a nanomaterial, namely photocatalysis, gas sensors, solar cells, fuel cells, polishing materials, automotive catalytic converters, corrosion protection coatings for metal and alloys, and ultraviolet light detectors [1][2][3][4][5][6][7]. This wide range of applications is based on the unique properties of cerium oxide, such as high chemical stability, low toxicity, high oxygen storage ability, high transparency in visible range, low ionization potential, good redox performance, good lattice compatibility with Si, ease and costeffective preparation, and others [1,5,[8][9][10].…”

Section: Introductionmentioning

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 Behaviorsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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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“…A decrease in the lattice parameter a can be observed in the doped samples indicating the incorporation of Mn atoms into the ceria lattice. This is a consequence of the substitution of the larger Ce 3+ (1.143 Å) and Ce 4+ (0.97 Å) cations by smaller Mn 2+ (0.80 Å), Mn 3+ (0.64 Å) and Mn 4+ (0.53 Å) cations [36]. A considerable decrease of lattice constant can be observed from the pure sample to the sample doped with 10% of manganese and further, although not as great decrease, for the 20% and 30% doping level.…”

Section: Resultsmentioning

confidence: 99%

Phase composition, morphology, properties and improved catalytic activity of hydrothermally-derived manganese-doped ceria nanoparticles

et al. 2022

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Manganese-doped ceria nanoparticles were prepared by hydrothermal synthesis and the prepared samples were thermally treated at 500 °C for 2 hours. The samples were investigated using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), energydispersive X-ray spectroscopy (EDS), N2 adsorption and X-ray photoelectron spectroscopy (XPS). XRD revealed that nanocrystalline ceria is the main phase in all samples, while a romanechite-like phase (Na2Mn O5 10) appears in the sample doped with 30% of Mn. TEM coupled with EDS exposed the presence of the same phase in the sample doped with 20% Mn. While ceria particles have spherical morphology and particle size ranging from 4.3 to 9.2 nm, the rare crystals of the romanechite-like phase adopt a tubular morphology with a length of at least 1 μm. However, the decrease in the ceria lattice constant and the EDS spectra of the ceria nanoparticles clearly indicate that a substantial amount of manganese entered the ceria crystal lattice. Manganese doping has a beneficial impact on the specific surface area of ceria. XPS measurements reveal a decrease in the Ce3+/Ce3++Ce4+ content in the doped samples which is replaced by Mn3+. Moreover, a drasticincrease in adsorbed oxygen is observed in the doped samples which is the consequence of the increase in Mn3+ species that promotes oxygen migrations to the surface of the sample. Compared to the pure sample, the doped samples showed significantly higher catalytic activity for the process of toluene oxidation.

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Effect of feedstock solution concentration on the spectroscopic and electrical transport properties of thermal plasma synthesized ZnO nanoparticles

Murugesan

Pasupathi

Selvadurai

et al. 2023

Ceramics International

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Dielectric relaxation, AC conductivity behavior and its relation to microstructure in mechanochemically synthesized Mn-doped CeO2 nanocrystals

Cited by 12 publications

References 48 publications

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

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

Phase composition, morphology, properties and improved catalytic activity of hydrothermally-derived manganese-doped ceria nanoparticles

Effect of feedstock solution concentration on the spectroscopic and electrical transport properties of thermal plasma synthesized ZnO nanoparticles

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