A comparative study of nanosized iron oxide particles; magnetite (Fe3O4), maghemite (γ-Fe2O3) and hematite (α-Fe2O3), using ferromagnetic resonance

Can, Musa Mutlu; Coşkun, Mustafa; Fırat, Tezer

doi:10.1016/j.jallcom.2012.07.091

Cited by 95 publications

(45 citation statements)

References 35 publications

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“…As reported in the literature, a high temperature is commonly used for demagnetization [21]. Demagnetization of Fe 3 O 4 (α-Fe 2 O 3 ) was obtained by heating Fe 3 O 4 particles up to 500 °C (under air atmosphere) to improve the dispersion of Fe 3 O 4 in the PBMA matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the dispersion state of particles in the matrix and the interactions between particles and the matrix are very important for damping properties of composites. To improve the dispersion of Fe 3 O 4 in the PBMA matrix, Fe 3 O 4 particles of demagnetization were prepared in high temperatures [20,21]. Moreover, to study the effect of fillers-matrixes interactions on the damping properties of PBMA, Fe 3 O 4 and graphene/Fe 3 O 4 hybrid particles were incorporated into PBMA.…”

Section: Introductionmentioning

confidence: 99%

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Damping Analysis of Some Inorganic Particles on Poly(butyl-methacrylate)

et al. 2018

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Viscoelastic polymers can be used as damping materials to control unexpected vibration and noise through energy dissipation. To investigate the effect of an inorganic filler on damping property, a series of inorganic particles, Ferriferous oxide(Fe3O4), Graphene/Fe3O4(GF), and Fe3O4 of demagnetization(α-Fe2O3) were incorporated into poly(butyl-methacrylate) (PBMA). The effects of the dispersion of particles, as well as the interaction between particles and the PBMA matrix on the damping property of composites, were systematically studied. Results revealed that the addition of three types of particles can effectively improve the damping properties and broaden the effective damping temperature range. Dispersion of α-Fe2O3 in the PBMA matrix is better than that of Fe3O4. As a result, the damping peak can be increased more. The interaction between GF and the PBMA matrix is stronger than that between Fe3O4 and the PBMA. The damping peak of the composites can be suppressed by GF, which is opposite to Fe3O4 and α-Fe2O3. In addition, glass transition temperature (Tg) of all composites in the study shifted to low temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damping Analysis of Some Inorganic Particles on Poly(butyl-methacrylate)

et al. 2018

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“…The frequencies of the two peaks for the BaFe 11.4 Ti 0.6 O 19 , BaFe 11.3 Ti 0.7 O 19 and BaFe 11.2 Ti 0.8 O 19 samples are (31.69 GHz, 36.08 GHz), (30.25 GHz, 34.40 GHz) and (29.39 GHz, 33.53 GHz), respectively. As is known, the Landé factor g for Fe 3+ ions is 2.0 and it is around 3.4 for localized Fe 2+ ions [20, 35], while the exchange coupling between Fe 3+ and Fe 2+ gives a g factor that is greater than 2.0 [20]. According to equation (2), the two values of g can be obtained based on the resonance frequency revealed by the two peaks.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, a new natural resonance with respect to the exchange coupling between Fe 2+ and Fe 3+ ions will appear in the ferrite, but the resonant frequency will be different from that related to the Fe 3+ ions. This implies that if the exchange coupling occurs in the ferrite, a new resonance peak and thus a new magnetic loss peak are expected to appear at another frequency position resulting from the Fe 3+ ions [19, 20]. Therefore, double natural resonance peaks will be generated simultaneously in the ferrite in this case.…”

Section: Introductionmentioning

confidence: 99%

Exchange coupling controlled ferrite with dual magnetic resonance and broad frequency bandwidth in microwave absorption

Jia

Liu

et al. 2013

Science and Technology of Advanced Materials

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Ti-doped barium ferrite powders BaFe12−xTixO19 (x = 0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8) were synthesized by the sol–gel method. The phase structure and morphology were analyzed by x-ray diffraction (XRD) and scanning electron microscopy, respectively. The powders were also studied for their magnetic properties and microwave absorption. Results show that the Ti-doped barium ferrites (BFTO) exist in single phase and exhibit hexagonal plate-like structure. The anisotropy field Ha of the BFTO decreases almost linearly with the increase in Ti concentration, which leads to a shift of the natural resonance peak toward low frequency. Two natural resonance peaks appear, which can be assigned to the double values of the Landé factor g that are found to be ∼2.0 and ∼2.3 in the system and can be essentially attributed to the existence of Fe3+ ions and the exchange coupling effect between Fe3+ and Fe2+ ions, respectively. Such a dual resonance effect contributes a broad magnetic loss peak and thus a high attenuation constant, and leads to a dual reflection loss (RL) peak over the frequency range between 26.5 and 40 GHz. The high attenuation constants are between 350 and 500 at peak position. The optimal RL reaches around −45 dB and the practicable frequency bandwidth is beyond 11 GHz. This suggests that the BFTO powders could be used as microwave absorbing materials with extraordinary properties.

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“…The other difference is the crystal structures. While α-Fe 2 O 3 has a rhombohedral crystal structure, γ-Fe 2 O 3 has cubic cells (Randrianantoandro et al 2001; Can et al 2012). Fe 2 O 3 NPs can be used as an adsorbent in the removal of metals from aqueous solutions (Grover et al 2012; Ge et al 2012; Gonzalez et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Influence of Alpha and Gamma-Iron Oxide Nanoparticles on Marine Microalgae Species

Demir

Ateş

Arslan

et al. 2015

Bull Environ Contam Toxicol

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The effects of alpha-iron oxide (α-Fe2O3) and gamma-iron oxide (γ-Fe2O3) nanoparticles (NPs) on marine microalgae species (Nannochloropsis sp. and Isochrysis sp.) were investigated in this study. Both Fe2O3 NPs covered the surface of algae with the agglomerates of the nanoparticles. This form of physical NP toxicity significantly decreased the sizes of phytoplankton. Both NPs were toxic to the tested algal species, while α-Fe2O3 showed less toxicity than γ-Fe2O3 NPs for both algal species. A comparative analysis of growth data of the two algal species treated with α-Fe2O3 or γ-Fe2O3 NPs revealed that Isochrysis sp. are more sensitive than Nannochloropsis sp. Toxicity of these widely used NPs to primary producers forming the base of the food chain in aquatic environments might result in widespread adverse effects on aquatic environmental health.

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A comparative study of nanosized iron oxide particles; magnetite (Fe3O4), maghemite (γ-Fe2O3) and hematite (α-Fe2O3), using ferromagnetic resonance

Cited by 95 publications

References 35 publications

Damping Analysis of Some Inorganic Particles on Poly(butyl-methacrylate)

Damping Analysis of Some Inorganic Particles on Poly(butyl-methacrylate)

Exchange coupling controlled ferrite with dual magnetic resonance and broad frequency bandwidth in microwave absorption

Influence of Alpha and Gamma-Iron Oxide Nanoparticles on Marine Microalgae Species

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