Evaluation of Hematite Nanoparticles Weak Ferromagnetism

Lafta, Sadeq H.

doi:10.1007/s10948-020-05626-8

Cited by 8 publications

(6 citation statements)

References 47 publications

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“…Thus, one can classify the MGC with x ≤ 6 wt.% iron oxide as weakly magnetic as those with x ≥ 8 wt.% iron oxide and strongly magnetic in terms of the amount of magnetic phases present in them. Interestingly, Dey et al., 35 Datta et al., 36 and Lafta et al 37 . have also reported similar ZFC–FC curve shapes as observed in our weakly magnetic MGC (i.e., x = 2, 4, and 6 wt.%).…”

Section: Resultssupporting

confidence: 86%

“…Thus, one can classify the MGC with x ≤ 6 wt.% iron oxide as weakly magnetic as those with x ≥ 8 wt.% iron oxide and strongly magnetic in terms of the amount of magnetic phases present in them. Interestingly, Dey et al, 35 Datta et al, 36 and Lafta et al 37 have also reported similar ZFC-FC curve shapes as observed in our weakly magnetic MGC (i.e., x = 2, 4, and 6 wt.%). Dey It is apparent from the above reports that similar ZFC-FC curves are observed in weak ferromagnetic or antiferromagnetic materials as observed in our weakly magnetic MGC.…”

Section: Resultssupporting

confidence: 85%

“…inset in Figure 1a). There are a few reports on nanomagnetic particles exhibiting similar ZFC–FC curves as observed in our MGC with x = 8, 10, and 15 wt.% iron oxide 37,42,43 . T IRR also shows an increase with iron oxide content in the MGC [ T IRR ∼ 265 K for x = 8, T IRR ∼ 275 K for x = 10, and T IRR > 305 K for x = 15].…”

Section: Resultssupporting

confidence: 82%

“…There are a few reports on nanomagnetic particles exhibiting similar ZFC-FC curves as observed in our MGC with x = 8, 10, and 15 wt.% iron oxide. 37,42,43 T IRR also shows an increase with iron oxide content in the MGC [T IRR ∼ 265 K for x = 8, T IRR ∼ 275 K for x = 10, and T IRR > 305 K for x = 15]. The third feature observed below 15 K in the ZFC-FC shifts toward lower temperature with an increase in iron oxide content.…”

Section: Resultsmentioning

confidence: 96%

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Influence of iron oxide substitution on the magnetic interactions in sol–gel‐derived 45S5 bioactive glass–ceramics

Nitu

Srinivasan

2023

J Am Ceram Soc.

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Magnetic interactions in sol-gel-derived bioactive magnetic glass-ceramics (MGCs) with compositions of (45 − x)SiO 2 ⋅24.5CaO⋅24.5Na 2 O⋅6P 2 O 5 xFe 2 O 3 (2 ≤ x ≥ 15 wt.%) have been investigated using electron paramagnetic resonance (EPR), and temperature-dependent magnetic susceptibility and magnetization (M-T) techniques. EPR spectra of the MGC samples revealed strong composition dependence in the intensity and linewidth of resonance absorptions at g ≈ 2.0 and g ≈ 4.3. EPR linewidth analysis showed the dominance of dipole-dipole interaction in MGC samples with iron oxide content ≤4 wt.% and a crossover to super-exchange type interaction in samples with higher iron oxide content. Composition-dependent magnetic interaction in these MGC could be related to Fe 2+ and Fe 3+ ion concentrations using high-temperature magnetic susceptibility studies. Zero-field cooled and field cooled M-T curves indicate different magnetic behavior for MGC samples with x ≤ 6 and x ≥ 8 wt.% iron oxide.Although the former show weak magnetic behavior, the latter exhibit superparamagnetic behavior which could be correlated with the percentage of magnetic phases present in each sample. These studies reveal composition-dependent variation in dipolar and super-exchange type interaction in the samples which could help in assessing these MGC for biomedical applications.

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Section: Resultssupporting

confidence: 86%

“…Thus, one can classify the MGC with x ≤ 6 wt.% iron oxide as weakly magnetic as those with x ≥ 8 wt.% iron oxide and strongly magnetic in terms of the amount of magnetic phases present in them. Interestingly, Dey et al, 35 Datta et al, 36 and Lafta et al 37 have also reported similar ZFC-FC curve shapes as observed in our weakly magnetic MGC (i.e., x = 2, 4, and 6 wt.%). Dey It is apparent from the above reports that similar ZFC-FC curves are observed in weak ferromagnetic or antiferromagnetic materials as observed in our weakly magnetic MGC.…”

Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 96%

See 2 more Smart Citations

Influence of iron oxide substitution on the magnetic interactions in sol–gel‐derived 45S5 bioactive glass–ceramics

Nitu

Srinivasan

2023

J Am Ceram Soc.

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“…221086). One can note a small shift in the peak of the (311) planes to the lower 2ϴ values due to the substitution of Co 2+ by Cs 1+ where the latter has a larger ionic radius (170pm) than the former (79pm) [10]. The calculated data are shown in Table 2.…”

Section: Experimental Partmentioning

confidence: 94%

INVESTIGATION THE MAGNETIC PROPERTIES OF CsyCo1-0.5yFe2O4 NANOPARTICLES AT LOW MOLAR RATIO VARIATION

Tareq

2023

Eurasian phys. tech. j.

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The effect of substitution ferrite by previously not used elements to control magnetic properties is of great interest to researchers. This study illustrates the effect of low substitution of Cs, with molar ratios of y of 0.0, 0.05, 0.15, and 0.25 on the structural and magnetic properties of CsyCo1-0.5yFe2O4nanoparticles. The synthesizing method was the co-precipitation method. The metal chlorides were used to perform the reaction in the distilled water using NaOH to reach a pH of 10. The X-ray diffraction, Field Emission Scanning Electron Microscopy, Electron Dispersive X-ray and Vibrating Sample Magnetometry analyses were conducted for all samples. All samples had the patternsof the spinel structure coincide to a high degree with the Co ferrite pattern. There was a general increase in the lattice constant with the increase in the Cs content, while the crystallite size decreased from about 18 to 12.2 nm as the molar ratio increased from 0 to 0.25. The Electron Microscopy investigation showed that all samples owing spherical nanoparticles with no other shapes. The average particle sizes were between 40 to 60nm, which increased Cs1+content. The magnetic parameters mainly showed a relatively high coercivity (wide loops) and a decrease in magnetization saturation (down to 50.43emu/g), crystalline anisotropic constant, and thesquareness ratio

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Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Naser,

Lafta,

Hashim

2024

Biotech and App Biochem

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The effects of 180, 210, and 230°C reaction temperatures on the structural and magnetic properties of synthesized iron sulfide nanoparticles were studied. The Rietveld refinement analysis result of the X‐ray diffraction data indicated that greigite was the dominant phase in all samples. The sample was prepared at 210°C for 18 h and had a greater wt% ratio of the greigite phase. The crystallite and particle sizes increased with increasing reaction temperatures. Scanning electron microscope images confirmed the presence of aggregation of synthesized rod‐shaped nanoparticles. The magnetic hysteresis curves of all samples showed ferromagnetic behavior at room temperature. The magnetic saturation of three samples increases with increased reaction temperature, but the coercive force has the opposite behavior. Antioxidant activity and cytotoxicity of the sample synthesized at 210°C were investigated. This sample killed cancer cells at relatively moderate and high concentrations with high viability of normal cells, demonstrating the sample's suitability for use in killing cancer cells while avoiding normal cells.

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Evaluation of Hematite Nanoparticles Weak Ferromagnetism

Cited by 8 publications

References 47 publications

Influence of iron oxide substitution on the magnetic interactions in sol–gel‐derived 45S5 bioactive glass–ceramics

Influence of iron oxide substitution on the magnetic interactions in sol–gel‐derived 45S5 bioactive glass–ceramics

INVESTIGATION THE MAGNETIC PROPERTIES OF CsyCo1-0.5yFe2O4 NANOPARTICLES AT LOW MOLAR RATIO VARIATION

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

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