Structural, optical and magnetic properties of (x)NiO/(1-x)CdFe2O4 nanocomposites

Yassine, R.; Abdallah, A.M.; Awad, R.; Bitar, Z.

doi:10.1016/j.physb.2021.413444

Cited by 10 publications

(5 citation statements)

References 43 publications

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“…If S has a value below 0.5, magneto-static interactions take place between the particles, whereas a value of 0.5 implies that the particles are non-interacting single domain [98,127]. According to table 5, the S values of the investigated samples lie below this limit, indicating the creation of a multi-domain structure with uniaxial anisotropy [127]. Subsequently, this demonstrates that the particles interact through magneto-static interactions.…”

Section: Vsm Measurementsmentioning

confidence: 96%

“…The squareness ratio (S = M r /M s ) is defined as the ratio of remanent magnetization to saturation magnetization. If S has a value below 0.5, magneto-static interactions take place between the particles, whereas a value of 0.5 implies that the particles are non-interacting single domain [98,127]. According to table 5, the S values of the investigated samples lie below this limit, indicating the creation of a multi-domain structure with uniaxial anisotropy [127].…”

Section: Vsm Measurementsmentioning

confidence: 98%

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Fabrication, characterization, and antibacterial activity of ferrite, chromite, and aluminate nanoparticles

El Hajjar,

Bitar,

Zahr

et al. 2024

Mater. Res. Express

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Zn0.33Co0.33Mg0.33X2O4 nanoparticles (NPs), where X = Fe, Cr, Al and denoted by F, C, and A, were prepared by the co-precipitation method. X-ray diffraction patterns validated the formation of NPs with cubic spinel structure with the detection of small amounts of impurities in samples C (Cr2O3) and A (MgO). Transmission electron micrographs showed a nearly spherical shape for samples F and A. However, sample C revealed cubic and nearly spherical shapes. Energy-dispersive x-ray analysis ensured the presence of chemical constituents in all samples. The vibrational modes of NPs were confirmed with Fourier transform infrared spectroscopy. The direct bandgap energy values, calculated using ultraviolet-visible spectroscopy, were in the range of 2.355 and 2.967 eV for F, C, and A samples. X-ray photoelectron spectroscopy analysis confirmed the compositions as well as the valence states of all elements. Magnetic hysteresis (M–H) loops revealed a soft ferromagnetic behavior. Sample F exhibited a higher saturation magnetization, remanent magnetization, magnetic moment, and magnetic anisotropy compared to those of samples C and A. The antibacterial activity of the tested samples against four bacteria (Staphylococcus aureus, Stenotrophomonas maltophilia, Escherichia coli, and Enterococcus faecium) was determined using the broth microdilution assay, minimum bactericidal concentration (MBC), and time-kill test. The prepared NPs exhibited varying antibacterial activity due to multiple factors. These results highlighted the potential utility of the ternary ferrite, chromite, and aluminate NPs in the treatment of microbial infections, particularly multidrug-resistant bacteria.

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Section: Vsm Measurementsmentioning

confidence: 96%

Section: Vsm Measurementsmentioning

confidence: 98%

Fabrication, characterization, and antibacterial activity of ferrite, chromite, and aluminate nanoparticles

El Hajjar,

Bitar,

Zahr

et al. 2024

Mater. Res. Express

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“…This proportionality is also noticed with Wang et al [68] 4). The squareness ratio has a decreasing trend with increasing the concentration of the co-dopants with values less than 0.5, suggesting the magnetostatic interaction between the nanoparticles in their pseudo-single domain [70,71]. The coercivity (H C ) of the samples were extracted from the original loops (figure 13) and from the obtained FM loops (figure 14(b)), and listed in table 4.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Abdallah¹,

Awad²

2022

Phys. Scr.

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Pure and different concentrations from (Gd, Ru) co-doped NiO nanoparticles, capped with Polyvinylpyrrolidone (PVP), were fabricated by the co-precipitation method. The nanoparticles were characterized by different techniques. The Rietveld refinements of X-Ray Diffraction (XRD) patterns confirmed the formation of the pure face-centered-cubic NiO phase. The X-ray Photo-induced Spectroscopy (XPS) assured the trivalent oxidation state of the doped ions Gd3+ and Ru3+ and unveiled the multiple oxidation states of nickel ions (Ni2+ and Ni3+), emerging from the vacancies in the samples. The Transmission Electron Microscope (TEM) images showed the pseudospherical morphology of the samples and the Energy Dispersive X-ray permitted the quantitative analysis of the presented elements and their homogeneous distribution. The Raman and Fourier Transform Infra-Red (FTIR) spectra depicted the fundamental vibrational bands of NiO nanoparticles, confirming their purity. The UV-visible spectroscopy enabled the absorption measurements and the energy gap calculations. The co-dopants increased the energy bandgap of NiO nanoparticles from 3.15 eV for pure NiO to 3.62 eV with the highest concentration of the co-dopants (x = 0.02) The photoluminescence (PL) spectra gave insights into the possible defects present in the samples, such as nickel vacancies, single and double oxygen vacancies, and oxygen interstitials. The Vibrating Sample Magnetometer (VSM) studied the room temperature M-H loops of the co-doped samples. A combination of ferromagnetic, antiferromagnetic, and paramagnetic contributions was noticed and treated according to the law of approach to saturation and bound magnetic polaron (BMP) model. The magnetic parameters, such as the saturation magnetization, exchange and anisotropy field, and the BMP concentration were extracted from the fitted models and discussed in terms of the co-dopants’ concentration. The co-doped samples showed a softer magnetic behavior, which is recommended for data storage applications.

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“…magnetically independent) particles, the squareness ratio (SQR) is determined as 0.5 for uniaxial anisotropy and 0.83 for cubic anisotropy[130,131]. In this study, the squareness values for the as-prepared samples (see table4) fall below 0.5, suggesting the presence of uniaxial anisotropy contribution and magnetostatic interactions[61,132]. C2 exhibits the highest squareness ratio (0.316) among the prepared binary nanocomposites.…”

mentioning

confidence: 66%

“…The crystallite sizes of the three pure nanophases are greater than those of the corresponding nanocomposite phases. Such a decrease in crystallite sizes in nanocomposites suggests a high surface-to-volume ratio [61]. Moreover, the crystallite sizes of the constituent phases (NiO, Ni 0.5 Zn 0.5 Fe 2 O 4 , BaFe 12 O 19 , and NiFe 2 O 4 ) of the nanocomposites (C1 to C3) do not change significantly.…”

Section: Resultsmentioning

confidence: 96%

Comparative study between oxide/soft ferrite, oxide/hard ferrite, and soft/hard ferrite nanocomposites: structural, electrical, and magnetic properties

Farhat,

Awad,

Bitar

2024

Phys. Scr.

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Three binary nanocomposites (NCs): (0.5NiO/0.5Ni0.5Zn0.5Fe2O4), (0.5NiO/0.5BaFe12O19), and (0.5Ni0.5Zn0.5Fe2O4/0.5BaFe12O19) were prepared using the co-precipitation method followed by the wet ball-milling technique. X-ray diffraction analysis showed the production of NiO and Ni0.5Zn0.5Fe2O single phases, while the α-Fe4 2O3secondary phase appeared in the BaFe12O19 and the 0.5Ni0.5Zn0.5Fe2O4/0.5BaFe12O19 nanocomposite. The transmission electron microscopy investigation and the selected area electron diffraction demonstrated the presence of the nanocomposites' constituent phases. X-ray photoelectron spectroscopy identified the oxidation states found in the prepared samples (Ba2+, Ni2+, Ni3+, Zn2+, Fe3+, and O2-). The bandgap values ( ) of the nanocomposites are in the range between 2.79 and 3.66 eV, which indicates their semiconductor nature. The DC conductivity experiment confirmed the semiconducting nature of all samples, and the activation energies ( ) and ( ) at high and low-temperature regions, respectively, were calculated from the Arrhenius equation. According to the vibrating sample magnetometer, the NCs exhibited ferromagnetic (FM) as showed by the M-H loops. In the oxide/soft ferrite NC, dM/dH curve indicated strong exchange coupling interactions, while the hard and the soft magnetic phases in the oxide/hard ferrite and the soft/hard ferrite NCs were weakly exchanged coupled. Significant uses had been found for each of the three nanocomposites according to their constituent phases and properties.

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Structural, optical and magnetic properties of (x)NiO/(1-x)CdFe2O4 nanocomposites

Cited by 10 publications

References 43 publications

Fabrication, characterization, and antibacterial activity of ferrite, chromite, and aluminate nanoparticles

Fabrication, characterization, and antibacterial activity of ferrite, chromite, and aluminate nanoparticles

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Comparative study between oxide/soft ferrite, oxide/hard ferrite, and soft/hard ferrite nanocomposites: structural, electrical, and magnetic properties

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