Influence of iron substitution on structural and dielectric properties of nano ZnMn2O4

Mohamed, Mohamed Bakr; Ghannam, Magdy M.; Ahmed, Sameh I.

doi:10.1007/s00339-021-04590-x

Cited by 18 publications

(5 citation statements)

References 31 publications

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“…Similar results were obtained where the PL intensity reduced upon doping or forming composites: for ZnS upon coupling with MFO, [39] for intermediate nanocomposites of MnS@ZnS system, [38] and for ZMO upon doping with Fe [18] or Cr. [19] In contrast Patade et al found that as MFO doped with Zn, the PL intensity increased. [11] The variation of the PL intensity may result from changing of the recombination rate between the photo-induced electrons (e) and holes (h + ) pairs created in the different samples which are depended on the trap levels produced in the bandgap upon alloying.…”

Section: Photoluminescence (Pl) Emissionsmentioning

confidence: 90%

“…[17] The relatively narrow bandgap of Feor Cr-doped ZMO together with the small dielectric properties nominated the produced materials to applied optoelectronic field. [18,19] In the present study, the influence of alloying between nano MFO and ZMO phases on the produced nanocomposite materials was examined employing Rietveld refinement procedure, x-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscope (TEM) techniques. Furthermore the effect of alloying on optical characteristics of the resulted nanocomposite was explored using the photoluminescence and ultra-violet (UV) diffused absorption devices.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Photoluminescence (Pl) Emissionsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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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“…Single-layer films doped with conductive substances, such as metal ions and carbon nanotubes [ 49 , 50 ], have been studied for insulating materials such as doped ceramics [ 36 , 37 , 38 , 39 , 40 , 41 , 42 ], but there is less literature on semiconductor high-entropy materials as a filler phase with which to modify PVDF-based semicrystalline polymers. Some literature has shown that spinel ferrite can improve dielectric and breakdown properties [ 51 , 52 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers

Qiao

Liu

et al. 2023

Polymers

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Polyvinylidene fluoride (PVDF)-based dielectric energy storage materials have the advantages of environmental friendliness, high power density, high operating voltage, flexibility, and being light weight, and have enormous research value in the energy, aerospace, environmental protection, and medical fields. To investigate the magnetic field and the effect of high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 nanofibers (NFs) on the structural, dielectric, and energy storage properties of PVDF-based polymers, (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 NFs were prepared via the use of electrostatic spinning methods, and (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite films were prepared via the use of the coating method. The effects of a 0.8 T parallel magnetic field, induced for 3 min, and the content of high-entropy spinel ferrite on the relevant electrical properties of the composite films are discussed. The experimental results show that, structurally, the magnetic field treatment causes the originally agglomerated nanofibers in the PVDF polymer matrix to form a linear fiber chain with different fiber chains parallel to each other along the magnetic field direction. Electrically, the introduction of the magnetic field enhanced the interfacial polarization, and the (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite film with a doping concentration of 10 vol% had a maximum dielectric constant of 13.9, as well as a low energy loss of 0.068. The high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 NFs and the magnetic field influenced the phase composition of the PVDF-based polymer. The α-phase and γ-phase of the cohybrid-phase B1 vol% composite films had a maximum discharge energy density of 4.85 J/cm3 and a charge/discharge efficiency of 43%.

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“…9 The conduction activation energy increased as the concentration of Fe doping rose in nano ZnMn 2-x Fe x O 4 samples. 10 Among various Fe doping ratios, a 15% iron (Fe)-doped ZMO sample exhibited the highest dielectric constant. Moreover, at a temperature of 60 °C, Fedoped ZMO samples demonstrated ferroelectric behavior.…”

mentioning

confidence: 99%

“…Moreover, at a temperature of 60 °C, Fedoped ZMO samples demonstrated ferroelectric behavior. 10 An elevation in the concentration (x) of vanadium (V) in the nano-ZnMn 2-x V x O 4 system resulted in an enlargement of the optical bandgap. Furthermore, the ac conductivity and dielectric constant underwent changes as the amount of V doping varied.…”

mentioning

confidence: 99%

Influence of Al Doping on the Structural, Optical, and Electrical Characteristics of ZnMn₂O₄

Heiba,

Ghannam,

Mohamed

et al. 2024

ECS J. Solid State Sci. Technol.

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Doped zinc manganite samples were synthesized using the sol-gel method, incorporating varying amounts of aluminum (ZnMn2-xAlxO4, x = 0, 0.03, 0.05, 0.07, 0.1). High-quality X-ray diffraction data enabled detection and accurate quantification of the predominant phase ZnMn2O4 (ZMO) and minor phase ZnO. The structure and microstructure of developed phases were investigated applying the Rietveld refinement method. The nanoscale nature of the samples was examined by High-resolution transmission electron microscopy. The incorporation of Al into the ZMO matrix and the oxidation states of various cations were studied through X-ray photoelectron spectroscopy. The introduction of Al resulted in a modification of the light-absorption characteristics of the ZMO sample. Specifically, the direct optical band gap energy of ZMO decreased from 2.45 to 2.25 eV with an increase in the amount of Al doping to 0.1. Moreover, an investigation was conducted into the impact of Al doping amount, frequency, and temperature on the dielectric constant, dielectric tangent loss, ac conductivity, complex impedance, and complex electric modulus. It was observed that all samples, except for the sample with x = 0.05, exhibited ferroelectric features.

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Influence of iron substitution on structural and dielectric properties of nano ZnMn2O4

Cited by 18 publications

References 31 publications

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

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

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers

Influence of Al Doping on the Structural, Optical, and Electrical Characteristics of ZnMn₂O₄

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Influence of iron substitution on structural and dielectric properties of nano ZnMn2O4

Cited by 18 publications

References 31 publications

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

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

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers

Influence of Al Doping on the Structural, Optical, and Electrical Characteristics of ZnMn2O4

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

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

Influence of Al Doping on the Structural, Optical, and Electrical Characteristics of ZnMn₂O₄