Interplay between cation distribution and magnetic properties for CoAlxFe2−xO4 0.0 ≤ x ≤ 0.7 nanoparticles

Ateia, Ebtesam E.; Meleka, K.K.; Ghobrial, F. Z.

doi:10.1007/s00339-021-04974-z

Cited by 11 publications

(2 citation statements)

References 49 publications

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“…As starting ingredients, stoichiometric concentrations of high purity (99.9%, Fisher chemicals) nitrates of iron, cobalt, gadolinium, erbium, and citric acid were utilized. Further details about the preparation method can be found in previous works [25][26][27].…”

Section: Synthesis Of Cgefo Npsmentioning

confidence: 99%

Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Ateia,

Elraaie,

Mohamed

2024

J. Phys. D: Appl. Phys.

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In the current study, we developed a simple and biocompatible method for producing core-shell nanoparticles (NPs). Citrate auto combustion and green procedures were used to create core-shell Ag/CoGd0.025Er0.05Fe1.925O4 (Ag/CGEFO) sample with an average crystallite size of 26.84 nm. The prepared samples were characterized via different structural techniques, such as X-ray diffraction (XRD), Raman Spectroscopy (RS), High Resolution Transmission Electron Microscopy (HRTEM), and Energy Dispersive X-ray analysis (EDX). These analyses were utilized to characterize and confirm the successful formation of the core-shell architecture. For core–shell NPs, all peaks of Ag and CoGd0.025Er0.05Fe1.925O4 ferrite are detected in the XRD, confirming the co-presence of the ferrite spinel phase and the cubic Ag phase. The magnetic hysteresis curves demonstrate typical hard ferri-magnetic behavior along with maximum magnetic saturation values up to 53.74 emu g−1 for the CGEFO sample, while an enhanced coercivity is detected for the coated sample. Moreover, the width of the hysteresis loop is increased for the Ag/CGEFO sample compared to the uncoated one. This indicates that the addition of Ag as a shell increases magneto crystalline anisotropy (MCA). Moreover, the Eg of uncoated CGEFO is equal to 1.4 eV, increasing to 3.6 eV for coated ones. This implies the influence of CGEFO is diminished when the surface is coated with Ag (shell), and the reflectance of the Ag/CGEFO core-shell is nearly dependent on the reflectance of the Ag shell layer. Consequently, the Ag/CGEFO can be used as a light shielding substance.

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Section: Synthesis Of Cgefo Npsmentioning

confidence: 99%

Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Ateia,

Elraaie,

Mohamed

2024

J. Phys. D: Appl. Phys.

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“…The Ms is utilized to calculate the experimental magnetic moment per unit formula (n B ), (see equation ( 6)) as referenced in the previous study [61]. Alternatively, the theoretical magnetic moment (h B ) can be computed from the Neel model as in equation ( 7) [62].…”

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confidence: 99%

Reduced A–B super exchange interaction in zirconium doped cobalt ferrite due to laser irradiation

Ateia,

Fangary,

Ghafar

2024

Phys. Scr.

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The impact of Nd:YAG laser irradiation and the addition of zirconium ions (Zr4+) on the physical properties of CoFe2O4 spinel nano-ferrites has been studied. The co-precipitation method was used to synthesize the samples. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) were employed to examine the structure and morphology. The decrease in the Curie temperature Tc is due to the laser irradiation and the increase in the Zr content of the sample. This decline in Tc is a result of an increase in the canting of the spins, leading to a change in the thermal energy needed for compensate the spin alignment. The difference in the Tc between the non irradiated and the irradiated samples is about 7%, 43% and 34% for CoFe2O4, Co1.1Zr0.1Fe1.8O4, and Co1.3Zr0.3Fe1.4O4, respectively. The decrease in the coercivity of the laser irradiated sample is due to a reduction in the magnetic anisotropy and an altered distribution of the cations (Co2+, Fe3+, Zr4+). The observed trend indicates that laser irradiation, and Zr substitution, can be used to modify the magnetic hardness of the samples. The low coercivity of irradiated Co1.1Zr0.1Fe1.8O4 makes it suitable for a range of applications. The high-frequency response of the Co1+xZrxFe2–2xO4 NPs shows that they can operate within the frequency range of 7.5 GHz–11.56 GHz.

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Efficient removal of Pb (II) from water solution using CaFe2−x−yGdxSmyO4 ferrite nanoparticles

Saeid

Ateia

2022

Appl. Phys. A

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Rare-earth doped calcium nano ferrites (CaFe2−x−yGdxSmyO4; x = y = 0.0; x = 0.025, y = 0.05) are synthesized by citrate nitrate auto combustion method. The prepared samples are characterized using X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), high-resolution transmission electron microscope (HRTEM), and vibrating sample magnetometer (VSM) analyses. After that, the samples were examined for Pb (II) ions removal from the water solution. The orthorhombic structure with space group Pnma is ratified from XRD. The average crystallite size of the synthesized powders is estimated from the broadening of the XRD lines in the range of 18–21 nm. FTIR confirms the molecular signature of the samples. The magnetic property is discussed based on super exchange interactions. The hysteresis loop shows two different magnetic behaviors of the investigated sample as well as increasing the coercivity from 14 to 240 G due to the doping. The electrical parameters are discussed in the basic hopping charge model, while the conduction mechanism of the samples will be discussed based on de-Boer and Verwey. The experimental results are subjected to kinetic and isotherm analyses. The Langmuir and Freundlich isotherms describe the adsorption of heavy metal ions as designated by the high correlation coefficient (R2). The use only 4 mg of the doped sample with low price ferrite nanoparticles has been utilized for 99.31% removal of Pb (II) from wastewater at a contact time of 10 min at room temperature.

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Interplay between cation distribution and magnetic properties for CoAlxFe2−xO4 0.0 ≤ x ≤ 0.7 nanoparticles

Cited by 11 publications

References 49 publications

Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Reduced A–B super exchange interaction in zirconium doped cobalt ferrite due to laser irradiation

Efficient removal of Pb (II) from water solution using CaFe2−x−yGdxSmyO4 ferrite nanoparticles

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Interplay between cation distribution and magnetic properties for CoAlxFe2−xO4 0.0 ≤ x ≤ 0.7 nanoparticles

Cited by 11 publications

References 49 publications

Designing bi-functional Ag-CoGd0.025Er0.05Fe1.925O4 nanoarchitecture via green method

Designing bi-functional Ag-CoGd0.025Er0.05Fe1.925O4 nanoarchitecture via green method

Reduced A–B super exchange interaction in zirconium doped cobalt ferrite due to laser irradiation

Efficient removal of Pb (II) from water solution using CaFe2−x−yGdxSmyO4 ferrite nanoparticles

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Product

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Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method

Designing bi-functional Ag-CoGd_0.025Er_0.05Fe_1.925O₄ nanoarchitecture via green method