Combustion synthesis, structural and magnetic characterization of Ce1−xPrxO2 system

Cruz-Pacheco, Andrés F.; Cuaspud, Jairo Alberto Gómez; Vargas, Carlos Arturo Parra; Castelló, Juan Bautista Carda

doi:10.1007/s10854-017-7546-6

Cited by 3 publications

(4 citation statements)

References 36 publications

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“…The radius of Pr 3+ (1.22 Å) is larger compared to that of Ce 4+ (0.97 Å), that is, the host lattice is expanded, we have a tensile strain. This is in qualitative agreement with the experimental data of Kim et al, Pacheco et al, Paunovic and the theoretical study of Dholabhai et al which obtained an increase of the lattice parameters. It must be noted that our model investigations are in disagreement with the experimental data of Sharma et al which observed a decrease of the lattice parameters in Pr doped CeO 2 NPs.…”

Section: Numerical Results and Discussionsupporting

confidence: 92%

“…It must be noted that our model investigations are in disagreement with the experimental data of Sharma et al which observed a decrease of the lattice parameters in Pr doped CeO 2 NPs. The grain size decreases with increasing Pr concentration . The tensile strain increases with increasing of the dopant concentration which causes enhanced oxygen vacancies and building of Ce 3+ ions.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

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Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Apostolov

Apostolova

Wesselinowa

2018

Physica Status Solidi (b)

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The magnetic properties of rare earth doped SnO 2 , TiO 2 , and CeO 2 nanoparticles are studied theoretically. The discrepancies in the literature for some doping cases are explained, for example, the lattice parameters and the magnetization in Pr and Sm doped CeO 2 nanoparticles. There is a strong connection between the lattice deformations and the magnetization M. M decreases (except for Y doped CeO 2 ) due to the larger radius of the rare earth ions compared to that of the host ions which leads to increase of the lattice parameters and decrease of the exchange interactions. The decrease of M is due also to the enhanced number of oxygen vacancies with increasing dopant concentration. For Y doping the lattice parameters decrease and M increases with increasing Y concentration. We have discussed the origin of the different behavior of M in rare earth doped nanoparticles.

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Section: Numerical Results and Discussionsupporting

confidence: 92%

Section: Numerical Results and Discussionmentioning

confidence: 99%

Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Apostolov

Apostolova

Wesselinowa

2018

Physica Status Solidi (b)

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“…The solutions were thermally treated up to 200°C under magnetic stirring (150 rpm) to remove the water until form the polymeric resin as described in previous works . The previous resins were treated to 350°C for 2 hours, promoting a spontaneous self‐combustion process, obtaining a carbonaceous product in each case, which serve as precursor material .…”

Section: Methodsmentioning

confidence: 99%

Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method

Cruz-Pacheco

Cuaspud

Vargas

et al. 2019

Int J Applied Ceramic Tech

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Nanoparticles of Ce 1−x Pr x O 2 (X: 0.6 and 0.8), were synthesized by the combustion method using citric acid as chelating and fuel agent. The X-ray diffraction patterns and Rietveld refinements confirm that samples shown as a single phase in a cubic fluorite structure, with an increase in the lattice parameter as a function of Pr concentration. The crystallite size domains obtained by the Scherrer formula, confirm values around 10 and 37 nm. The scanning electron microscopy images, show that the solids are composed of dense heterogeneous aggregates. The X-ray photoelectron spectroscopy, reveals that oxides are composed of cerium and praseodymium cations in oxidation states 4+ and 3+ respectively. The TPR-H 2 profiles indicate that cerium and praseodymium cations present in the obtained systems are completely reduced to Ce 3+ and Pr 3+ at temperatures above 790°C. The impedance spectroscopy data at room temperature showed that the conduction processes for the two systems take place at the grain boundaries. The Ce 0.2 Pr 0.8 O 2 system offer lower resistance, due to the high amount of Pr 3+ ions inserted in the structure and the high amount of oxygen vacancies formed in the synthesis process.

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“…The measurements were developed with an acceleration voltage of 40 kV and a current of 20 mA. The average size of the crystalline domains was determined with the Debye-Scherrer equation using the highest intensity peak in the diffraction pattern of each sample [29]. The infrared (IR) spectra were obtained in the Thermo Scientific Nicolet iS50 spectrometer, by the technique of total attenuated reflection (ATR).…”

Section: Characterization Of Peek Films Coated With Agnpsmentioning

confidence: 99%

Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity

et al. 2019

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The coating of polymeric substrate polyetheretherketone (PEEK) with silver nanoparticles (AgNPs) was carried out by a wet chemical route at room temperature. The coating process was developed from the Tollens reagent and D-glucose as reducing agent. The resulting composite exhibited antimicrobial activity. The PEEK films were coated with a single layer and two layers of silver nanoparticles in various concentrations. The crystallographic properties of the polymer and the silver nanoparticles were analyzed by X-ray diffraction (XRD). Fourier transform infrared spectra (FTIR) show the interaction between the silver nanoparticles with the polymeric substrate. Transmission electron microscope (TEM) images confirmed the obtaining of metallic nanoparticles with average sizes of 25 nm. It was possible to estimate the amount of silver deposited on PEEK with the help of thermogravimetric analysis. The morphology and shape of the AgNPs uniformly deposited on the PEEK films was ascertained by the techniques of scanning electron microscopy (SEM) and atomic force microscopy (AFM), evidencing the increase in the amount of silver by increasing the concentration of the metal precursor. Finally, the antibacterial activity of the films coated with Ag in Escherichia coli, Serratia marcescens and Bacillus licheniformis was evaluated, evidencing that the concentration of silver is crucial in the cellular replication of the bacteria.

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Combustion synthesis, structural and magnetic characterization of Ce1−xPrxO2 system

Cited by 3 publications

References 36 publications

Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method

Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity

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Combustion synthesis, structural and magnetic characterization of Ce1−xPrxO2 system

Cited by 3 publications

References 36 publications

Magnetic Properties of Rare Earth Doped SnO2, TiO2 and CeO2 Nanoparticles

Magnetic Properties of Rare Earth Doped SnO2, TiO2 and CeO2 Nanoparticles

Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method

Coating of Polyetheretherketone Films with Silver Nanoparticles by a Simple Chemical Reduction Method and Their Antibacterial Activity

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Product

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Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles

Magnetic Properties of Rare Earth Doped SnO₂, TiO₂ and CeO₂ Nanoparticles