Structural phase analysis, optical and magnetic properties of nano Mn-doped LiFe5O8

Mohamed, Mohamed Bakr

doi:10.1007/s00339-018-2241-x

Cited by 26 publications

(5 citation statements)

References 39 publications

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“…The minor superstructural peaks like (210), (211), and (310) confirm the formation of a disordered spinel structure in pure Li 0.5 Fe 2.5 O 4 , whereas the structure becomes more ordered with the substitution of Cr ions as those minor peaks are fed out. A similar observation was noted for the Mn substituted Li 0.5 Fe 2.5 O 4 reported by Z. K. Heiba et al 25 With the increasing content of the Cr ions in the lattice of Li 0.5 Fe 2.5 O 4 , there were linear decreases in the estimated values of the lattice constant, unit cell volume, and average crystallite size (except at Cr = 0.4 and 0.6), whereas a linear increase in micro-strain, was noted. The resulting values of those parameters are estimated through a Reitveld refinement and enlisted in Table I.…”

Section: Resultssupporting

confidence: 89%

FTIR and Electrical Properties of Cr Substituted Li_0.5Fe_2.5−xO₄ Synthesized Using Sol-Gel Auto Combustion

Patil¹,

Mane²,

Kharade³

et al. 2022

ECS J. Solid State Sci. Technol.

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The highly desirable properties of lithium ferrite and various metal ion substituted lithium ferrite make it a useful material for many electronic and magnetic applications. This research used a simple sol-gel auto-combustion method for the synthesis of Cr substituted Li0.5Fe2.5O4 ferrite. Here, in the B-site, Fe3+ ions were swapped by non-magnetic Cr3+ ions at different concentrations. All the samples of Cr substituted Li0.5Fe2.5O4 were confirmed through x-ray diffraction patterns to have a single-phase spinel-type structure with cubic symmetry, which was thereafter confirmed by its refinement through Rietveld. An increase in the substitution of Cr3+ instead of Fe3+ ions in the spinel ferrite system results in an increased nanocrystalline size. The average crystallite size decreased from 30nm to 10 nm with an increase in Cr3+ content. Analogous particle size was evaluated through transmission electron microscopy (TEM) analysis. Fourier transform infrared spectroscopy (FTIR) provides an overview of the structural distortion of the lithium ferrite lattice with the substitution of Cr3+ ions. The Semiconducting (NTCR) nature of the Cr substituted Li0.5Fe2.5O4 nanoparticles was confirmed through the temperature-dependent DC resistivity. The evaluated trend of the dielectric properties (ε', ε'', and tanδ) strengthens the facts observed in the electrical conduction mechanism.

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Section: Resultssupporting

confidence: 89%

FTIR and Electrical Properties of Cr Substituted Li_0.5Fe_2.5−xO₄ Synthesized Using Sol-Gel Auto Combustion

Patil¹,

Mane²,

Kharade³

et al. 2022

ECS J. Solid State Sci. Technol.

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“…Nanosized magnetic particles have properties which are definitely unlike that of the relating bulk materials because of their reduced size and the consequent impact of magnetic interactions between particles. Spinel ferrite nanoparticles have the common formula AFe 2 O 4 (A: divalent metal cation) where a face-centered cubic lattice is formed by oxygen ions and A ions located at tetrahedral and/or octahedral sublattice sites [4,5]. The unpaired electrons of transition metal cations positioned at tetrahedral and octahedral sites are responsible for magnetization in spinel ferrites due to variations in their spin magnetic momnets.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Crystal Structure, Electrical and Magnetic Properties of Spinel Mn-Cd Ferrite Nanoparticles

Abouhaswa

Badr

Nasr

et al. 2021

J Inorg Organomet Polym

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Fe 2 Cd 1-x Mn x O 4 (x= 0, 0.25, 0.5, 0.75, 1) spinel ferrite nanoparticle samples were synthesized using a flash auto-combustion technique and analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). The inspection of dielectric and magnetic properties of the prepared ferrites was carried out by using broadband dielectric spectroscopy (BDS) and vibration sample magnetometer (VSM) measurements, respectively. Xray diffraction analysis verified the formation of the main cubic phase with space group Fd3m and a decrease in lattice constants with the increase in Mn-content.FTIR study revealed the two characteristic absorption bands of spinel ferrites and their dependence on Mn-content was investigated and explained. Elastic moduli such as Longitudinal, transverse and mean elastic wave velocities (𝑉 𝑙 , 𝑉 𝑡 𝑉 𝑚 ), bulk modulus (𝐵), rigidity modulus (𝐺), Young modulus (𝐸) and calculated Debye temperature ( D ) have been studied and found to decrease with the increase in Mncontent. SEM analysis revealed nanoparticles agglomeration of uniform grains with increasing in the average grain size as Mn-content increased. The VSM measurements showed an increase in saturation magnetization (M s ) accompanied by a decrease in coercivity (H c ) as Mn-content increased. Dielectric investigations showed very high values of permittivity and dielectric loss at lower frequencies reflecting the combination of exchange of electrons between ferrous and ferric ions and ions' transport. The ac-conductivity showed a plateau that yields the dcconductivity (σ dc ) at lower frequencies followed by a characteristic frequency (ν c ) at which it tends out to follow a power law. The relation between these two parameters confirms the empirical BNN-relation.

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“…The spectrum of the pure sample MFO (x = 0.0), has two vibrational bands observed at 552.1 cm −1 and 628.3 cm −1 which could be assigned to stretching vibrations of metal ↔ O at octahedral and tetrahedral sites, respectively. [24,25] For x = 0.2 sample, MFO phase is the dominant, (see Table 1), so only MFO vibrational bands appeared at 554.2 cm −1 and 636.6 cm −1 for octahedral and tetrahedral vibrational bands, respectively; no characteristic bands for ZMO are observed in the spectrum. One can notice in Fig.…”

Section: Resultsmentioning

confidence: 98%

Impact of composition ratio on the structure and optical properties of (1 – x)MnFe₂O₄/(x)ZnMn₂O₄ nanocomposite

Mohamed¹,

Alkathiri²,

Ahmed³

et al. 2022

Chinese Phys. B

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(1-x)MnFe2O4 (MFO)/xZnMn2O4 (ZMO) (x=0, 0.2, 0.5, 0.8, 1) nanocomposite samples were prepared using co-precipitation procedure. The phase percentage, cell parameters, and crystallite size of MFO and ZMO phases in each nanocomposite sample was calculated using Rietveld refinement procedure. X-ray diffraction analysis and Fourier-transform infrared spectroscopy techniques established the variation in the lattice parameters of each phase is due to permutation all cations among the octahedral and tetrahedral sites of MFO and ZMO. The different oxidation states of different ions in all samples were determined using X-ray photoelectron spectroscopy (XPS) technique. The variation in absorbance of the nanocomposite samples with composition parameter (x) is dependent on the wavelength region. The optical bandgap of the nanocomposite samples is decreased as the content of ZMO phase increased. The effect of alloying on the refractive index, extinction coefficient, dielectric constant, optical conductivity and the nonlinear optical behaviors of all samples was studied in detail. The nanocomposite sample x=0.5 disclosed upgraded optical parameters with the highest refractive index, optical conductivity, and PL intensity, which nominate it to be functional in various application fields.

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Structural phase analysis, optical and magnetic properties of nano Mn-doped LiFe5O8

Cited by 26 publications

References 39 publications

FTIR and Electrical Properties of Cr Substituted Li_0.5Fe_2.5−xO₄ Synthesized Using Sol-Gel Auto Combustion

FTIR and Electrical Properties of Cr Substituted Li_0.5Fe_2.5−xO₄ Synthesized Using Sol-Gel Auto Combustion

Investigation of Crystal Structure, Electrical and Magnetic Properties of Spinel Mn-Cd Ferrite Nanoparticles

Impact of composition ratio on the structure and optical properties of (1 – x)MnFe₂O₄/(x)ZnMn₂O₄ nanocomposite

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Structural phase analysis, optical and magnetic properties of nano Mn-doped LiFe5O8

Cited by 26 publications

References 39 publications

FTIR and Electrical Properties of Cr Substituted Li0.5Fe2.5−xO4 Synthesized Using Sol-Gel Auto Combustion

FTIR and Electrical Properties of Cr Substituted Li0.5Fe2.5−xO4 Synthesized Using Sol-Gel Auto Combustion

Investigation of Crystal Structure, Electrical and Magnetic Properties of Spinel Mn-Cd Ferrite Nanoparticles

Impact of composition ratio on the structure and optical properties of (1 – x)MnFe2O4/(x)ZnMn2O4 nanocomposite

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Product

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FTIR and Electrical Properties of Cr Substituted Li_0.5Fe_2.5−xO₄ Synthesized Using Sol-Gel Auto Combustion

FTIR and Electrical Properties of Cr Substituted Li_0.5Fe_2.5−xO₄ Synthesized Using Sol-Gel Auto Combustion

Impact of composition ratio on the structure and optical properties of (1 – x)MnFe₂O₄/(x)ZnMn₂O₄ nanocomposite