Impact of Chromium Doping on Structural, Optical, Magnetic and Electrical Properties of Nano-Copper Ferrite

GAD, S. A.; MOUSTAFA, A. M.; AZAB, A. A.; HEGAB, A. F.

doi:10.15251/jor.2020.165.293

Cited by 2 publications

(1 citation statement)

References 49 publications

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“…The ac conductivity measurements were made for PANI / SnO 2 nanocomposites at different temperatures for the frequency range between 10Hz and 8MHz. The ac conductivity (σ ac ) of the nanocomposites were calculated using the formula [20,21], σ ac = ε 0 ε r ω tanδ where ε 0 is the permittivity of free space (8.85 × 10 −12 Farad/metre), ε r is the dielectric constant, ω(2πf) is the angular frequency and tanδ is the loss factor. Fig.…”

Section: Electrical Studies -Ac Conductivitymentioning

confidence: 99%

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2021

JOR

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Tin Oxide (SnO 2 ) nanoparticles were prepared by the microwave-assisted solution method. Aniline monomers were prepared and polymerization in the suspension of SnO 2 to form nanocomposites material, in which SnO 2 nanoparticle was embedded within the polyaniline chain (PANI). Structural, Optical, Morphology and AC electrical conductivity studies of the sample were carried out using power X-ray diffraction, Fourier Transform Infrared Spectroscopy, UV-Vis Spectroscopy, Scanning Electron Microscope, High-Resolution Transmission Electron Microscope and AC Impedance Spectroscopy. Powder XRD helped to confirm the formation of PANI/SnO 2 composites and the crystallite size of the nanocomposite is found to be 16 nm. Structural changes of PANI due to the presence of SnO 2 in PANI/SnO 2 nanocomposites have been analyzed in FT-IR and UV-Vis spectrum. SEM images show the morphology of PANI/SnO 2 nanocomposites. HRTEM images were observed and showed that the SnO 2 was scattered and confirmed the PANI chain that formed a PANI/SnO 2 nanocomposites material. AC conductivity was studied in the frequency between 10 Hz -8 MHz. At higher angular frequencies, the nanocomposites exhibit almost the maximum value of AC electrical conductivity (σ ac ) is found at 303K of SnO 2 in PANI.

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Section: Electrical Studies -Ac Conductivitymentioning

confidence: 99%

Untitled

2021

JOR

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Mg2+ Doped ZCFAO Spinel Ferrite: Structural, Optical, Dielectric and Magnetic Explorations

Moustafa,

Gad,

Hashem

2024

J Inorg Organomet Polym

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A series of Mg doped ZCFAO (Zn0.3−xMgxCu0.7Al0.3Fe1.7O4 (0.05 ≤ x ≤ 0.25) spinel samples were synthesized by solid state reaction method. XRD, was utilized to investigate the structure phase, microstructural characteristics, The optical properties were analyzed; Biological instruments Sp-150 potentiostate is employed to investigate the dielectric measurements in the frequency range of 10 Hz to 1 MHz at various temperatures from 300 to 650 K. Vibrating sample magnetometer VSM was employed to examine the magnetic characteristics in the applied magnetic field ranging from − 20 to 20 kG. The creation of a single-phase cubic spinel was validated by X-ray analysis. The leverage of replacing Zn by Mg leads to enhancement in the lattice parameters, reducing both of the degree of inversion, crystal distortion and compelled these samples to be normal spinel. It turned out that as the degree of inversion sank, the crystallite size declined. The values of dislocations density was found in the order of 10−5 which reveal improving and completing the crystallization of the ferrite samples. The samples have an optical energy gap in the range 3.1–3.38 eV, according to the inferred optical characteristics. The dielectric constant revealed the normal behavior of spinel ferrite it decreases with increasing frequency and enhanced with increasing temperature. It seems that the microstructure of the compound consists of both high-conductive grains and low-conductive grain boundaries, which has been confirmed by the complex impedance. Additionally, the presence of the Maxwell–Wagner relaxation process is also detected. This information can provide valuable insights into the properties and behavior of the compound. Using Nyquist plot, the sample impedance characteristics were interpreted while taking grain and grain boundary contributions into account. The magnetic properties proved that doping ZCFAO with diamagnetic cations (Mg) increases both of saturation magnetization from 16.416 up to 29.983 emu/g and the magnetocrystalline anisotropic constant from 1319.24 to 1612.804 because the two main factors that influence the magnetic properties are the distribution of cations between the octahedral and tetrahedral sites and the magnetic moment of each of its cations. Novelty of our work replacing Zn by Mg (both of them diamagnetic materials) enhance the magnetic properties. Synthesized materials may reexamine the mechanisms underlying Mg2+ induced cationic exchange in ZCFAO and have prospective uses as soft-magnetic materials.

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Impact of Chromium Doping on Structural, Optical, Magnetic and Electrical Properties of Nano-Copper Ferrite

Cited by 2 publications

References 49 publications

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Mg2+ Doped ZCFAO Spinel Ferrite: Structural, Optical, Dielectric and Magnetic Explorations

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