Optical and magnetic properties of perovskite materials: Ba0.3La0.7Ti0.3Fe0.7O3 and Ba0.1La0.9Ti0.1Fe0.9O3

Bachraoui, Fatima El; Chchiyai, Zakaria; Tamraoui, Youssef; Moussaoui, H. El; Alami, Jones; Manoun, Bouchaib

doi:10.1016/j.jre.2021.05.008

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…n = 2 for direct transition and n = 1/2 for indirect transition, n = 2/3 for direct forbidden, and n = 1/3 for indirect forbidden. 50 The optical gap values for NF-micro and NF-nanoparticles were determined to be 1.4 eV and 1.5 eV, respectively. This value was found by plotting ( αhν ) 1/2 vs. hν , where the optical band gaps ( E g ) are the intercepts with the energy axes as shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

High-density polyethylene composites filled with micro- and nano-particles of nickel ferrite: magnetic, mechanical, and thermal properties

Baayyad,

Esshouba,

Barhoumi

et al. 2024

RSC Adv.

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Section: Resultsmentioning

confidence: 97%

High-density polyethylene composites filled with micro- and nano-particles of nickel ferrite: magnetic, mechanical, and thermal properties

Baayyad,

Esshouba,

Barhoumi

et al. 2024

RSC Adv.

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“…From this figure, it can be seen that the observed XRD pattern shows great agreement with the calculated XRD pattern, revealing the success of a realized structural refinement for the synthesized Zn 0.5 Mg 0.5 FeMnO 4 spinel ferrite. Moreover, the quality of the structural refinement was evaluated by the consideration of the different R-factors such as structure factor (R F ), Bragg factor (R B ), profile factor (R P ), expected factor (R exp ), and profile factor (R wp ) [57][58][59][60]. The results of the powder X-ray diffraction of the synthesized Zn 0.5 Mg 0.5 FeMnO 4 spinel oxide in the Rietveld refinement such as structural parameters, profile parameters, and different reliability R-factors are summarized in Table 1.…”

Section: X-ray Diffraction Rietveld Refinement and Crystal Structurementioning

confidence: 99%

Design and Performance of a New Zn0.5Mg0.5FeMnO4 Porous Spinel as Anode Material for Li-Ion Batteries

Chchiyai,

El Ghali,

Lahmar

et al. 2023

Molecules

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Due to the low capacity, low working potential, and lithium coating at fast charging rates of graphite material as an anode for Li-ion batteries (LIBs), it is necessary to develop novel anode materials for LIBs with higher capacity, excellent electrochemical stability, and good safety. Among different transition-metal oxides, AB2O4 spinel oxides are promising anode materials for LIBs due to their high theoretical capacities, environmental friendliness, high abundance, and low cost. In this work, a novel, porous Zn0.5Mg0.5FeMnO4 spinel oxide was successfully prepared via the sol–gel method and then studied as an anode material for Li-ion batteries (LIBs). Its crystal structure, morphology, and electrochemical properties were, respectively, analyzed through X-ray diffraction, high-resolution scanning electron microscopy, and cyclic voltammetry/galvanostatic discharge/charge measurements. From the X-ray diffraction, Zn0.5Mg0.5FeMnO4 spinel oxide was found to crystallize in the cubic structure with Fd3¯m symmetry. However, the Zn0.5Mg0.5FeMnO4 spinel oxide exhibited a porous morphology formed by interconnected 3D nanoparticles. The porous Zn0.5Mg0.5FeMnO4 anode showed good cycling stability in its capacity during the initial 40 cycles with a retention capacity of 484.1 mAh g−1 after 40 cycles at a current density of 150 mA g−1, followed by a gradual decrease in the range of 40–80 cycles, which led to reaching a specific capacity close to 300.0 mAh g−1 after 80 cycles. The electrochemical reactions of the lithiation/delithiation processes and the lithium-ion storage mechanism are discussed and extracted from the cyclic voltammetry curves.

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“…Perovskite oxides, ABO 3 , have unique physical and chemical properties, such as stable crystal structure, excellent electromagnetic properties, and high electrocatalytic activity, which have been extensively explored in solid oxide fuel cells, catalysts, , high-temperature sensors, , and magnetoresistance devices . The electronic properties and catalytic activity of ABO 3 can be improved by chemically replacing A(B) sites , or introducing oxygen vacancy defects and has thus become a promising substitute for some noble metal materials. Previous studies have given an overview of the calculation approaches, physical properties, and related thermodynamic quantities of defects and impurities in solids. , While considering most applications of ABO 3 involve chemical reactions, the stability and type of exposed surfaces are rather essential …”

Section: Introductionmentioning

confidence: 99%

Revisiting the Low-Index Surfaces of LaCoO₃ with a Passivation Strategy

Zheng

Wang

et al. 2023

J. Phys. Chem. C

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A proper modeling is essential for calculating the surface properties of complex oxides, for example, perovskite oxides. Many studies have shown that traditional selections of slab models, either symmetric or asymmetric ones, may vary the calculated results of the polar surfaces, which will finally affect the perception of surface properties. To solve this issue, we proposed a passivation method to handle the complex polar surfaces, where the pseudo-atoms with fractional charges were used to balance non-zero net charges on one side of the surfaces. Based on this method, we revisited the low-index surfaces of LaCoO3, including (11̅02), (1̅104), and (0001) surfaces, with different terminations. The results suggested that the (11̅02)-LaO, (11̅02)-CoO2, and (0001)-LaO3 terminations were stable surfaces in different O and Co chemical environments. The oxygen vacancy formation energies (E Ov) of the (11̅02)-LaO and (11̅02)-CoO2 terminations were also evaluated. Different from the unpassivated cases, the E Ov of the passivated LaO and CoO2 terminations converged rapidly when slab thickness increased. The upward shift trend of the E Ov after passivation was more consistent with the experimental results. The electronic structure analysis indicated that the oxygen vacancy mainly changed the valence state of the surrounding Co atoms. This work provides a more accurate calculation method, which may benefit the study on catalytic properties of complex oxides.

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Optical and magnetic properties of perovskite materials: Ba0.3La0.7Ti0.3Fe0.7O3 and Ba0.1La0.9Ti0.1Fe0.9O3

Cited by 8 publications

References 37 publications

High-density polyethylene composites filled with micro- and nano-particles of nickel ferrite: magnetic, mechanical, and thermal properties

High-density polyethylene composites filled with micro- and nano-particles of nickel ferrite: magnetic, mechanical, and thermal properties

Design and Performance of a New Zn0.5Mg0.5FeMnO4 Porous Spinel as Anode Material for Li-Ion Batteries

Revisiting the Low-Index Surfaces of LaCoO₃ with a Passivation Strategy

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Optical and magnetic properties of perovskite materials: Ba0.3La0.7Ti0.3Fe0.7O3 and Ba0.1La0.9Ti0.1Fe0.9O3

Cited by 8 publications

References 37 publications

High-density polyethylene composites filled with micro- and nano-particles of nickel ferrite: magnetic, mechanical, and thermal properties

High-density polyethylene composites filled with micro- and nano-particles of nickel ferrite: magnetic, mechanical, and thermal properties

Design and Performance of a New Zn0.5Mg0.5FeMnO4 Porous Spinel as Anode Material for Li-Ion Batteries

Revisiting the Low-Index Surfaces of LaCoO3 with a Passivation Strategy

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Revisiting the Low-Index Surfaces of LaCoO₃ with a Passivation Strategy