Characterization and magnetic properties of Sm- and Gd-substituted CoFe2O4 nanoparticles prepared by forced hydrolysis in polyol

Tahar, Lotfi Ben; Smiri, Leila Samia; Artus, Mathieu; Joudrier, Anne-Laure; Herbst, Frédéric; Vaulay, M.-J.; Ammar, Souad; Fiévet, Fernand

doi:10.1016/j.materresbull.2006.12.014

Cited by 79 publications

(45 citation statements)

References 21 publications

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Section: Morphological Analysismentioning

confidence: 99%

“…The average particle size is found to be 56 nm for CuFe2O4 and 68 nm ZnFe2O4, respectively. Spinel ferrite particles generally have a spherical shape with smooth surfaces and a narrow size distribution [41,46]. Figure 4a,b shows the room-temperature magnetic hysteresis loops of the CuFe2O4 and ZnFe2O4 nanoparticles prepared by the sol-gel self-combustion technique.…”

Section: Morphological Analysismentioning

confidence: 99%

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Evaluation of Antioxidant and Cytotoxicity Activities of Copper Ferrite (CuFe2O4) and Zinc Ferrite (ZnFe2O4) Nanoparticles Synthesized by Sol-Gel Self-Combustion Method

et al. 2016

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Spinel copper ferrite (CuFe 2 O 4 ) and zinc ferrite (ZnFe 2 O 4 ) nanoparticles were synthesized using a sol-gel self-combustion technique. The structural, functional, morphological and magnetic properties of the samples were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). XRD patterns conform to the copper ferrite and zinc ferrite formation, and the average particle sizes were calculated by using a transmission electron microscope, the measured particle sizes being 56 nm for CuFe 2 O 4 and 68 nm for ZnFe 2 O 4. Both spinel ferrite nanoparticles exhibit ferromagnetic behavior with saturation magnetization of 31 emug´1 for copper ferrite (50.63 Am 2 /Kg) and 28.8 Am 2 /Kg for zinc ferrite. Both synthesized ferrite nanoparticles were equally effective in scavenging 2,2-diphenyl-1-picrylhydrazyl hydrate (DPPH) free radicals. ZnFe 2 O 4 and CuFe 2 O 4 nanoparticles showed 30.57%˘1.0% and 28.69%˘1.14% scavenging activity at 125 µg/mL concentrations. In vitro cytotoxicity study revealed higher concentrations (>125 µg/mL) of ZnFe 2 O 4 and CuFe 2 O 4 with increased toxicity against MCF-7 cells, but were found to be non-toxic at lower concentrations suggesting their biocompatibility.

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Section: Morphological Analysismentioning

confidence: 99%

Section: Morphological Analysismentioning

confidence: 99%

Evaluation of Antioxidant and Cytotoxicity Activities of Copper Ferrite (CuFe2O4) and Zinc Ferrite (ZnFe2O4) Nanoparticles Synthesized by Sol-Gel Self-Combustion Method

et al. 2016

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“…Ferrimagnetic materials, are an important class of magnetic ceramics, have drawn much attention for the past few decades due to their remarkable properties like high saturation magnetization, large permeability at high frequency, low eddy current, and high electrical resistivity to be utilized in solid state electronics and magneto-electronics [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Chemical bonding and magnetic properties of gadolinium (Gd) substituted cobalt ferrite

Puli

Adireddy

Ramana

2015

Journal of Alloys and Compounds

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Polycrystalline gadolinium (Gd) substituted cobalt ferrites (CoFe 2-x Gd x O 4 ; x=0-0.3, referred to CFGO) ceramics have been synthesized by solid state reaction method. Chemical bonding, crystal structure and magnetic properties of CFGO compounds have been evaluated as a function of Gd-content. X-ray diffraction and Raman spectroscopic analyses confirmed the formation of inverse spinel structure. However, a secondary ortho-ferrite phase (GdFeO 3 ) nucleates for higher values of Gd-content. A considerable increase in the saturation magnetization has been observed upon the initial substitution of Gd (x=0.1). The saturation magnetization drastically decreases at higher Gd content (x≥0.3). No contribution from ortho-ferrite GdFeO 3 phase is noted to the magnetic properties. The increase in the magnetic saturation magnetization is attributed to the higher magnetic moment of Gd 3+ (4f 7 ) residing in octahedral sites is higher when compared to that of Fe 3+ (3d 5 ) and as well due to the migration of Co 2+ (3d 7 ) ions from the octahedral to the tetrahedral sites with a magnetic moment aligned anti-parallel to those of rare earth (RE 3+ ) ions in the spinel lattice. Increase in coercivity with increase in Gd 3+ is content is attributed to magnetic anisotropy in the ceramics.

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“…The broadening and the asymmetry of the Raman peaks may be related to a high degree of cation disorder induced by the milling. 41 No ZnO and CoO are detected as separate phases in the Raman spectra of the samples (no distortion of the lattice cell was observed by XRD either). No peaks induced by CoO could be detected according to literature.…”

Section: 2 Phase Composition and Crystal Structure Of Ternary MIXmentioning

confidence: 91%

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Tzvetkov¹,

Milanova²,

Cherkezova‐Zheleva

et al. 2017

ACSi

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A combination of thermal and mechanical (high energy ball milling) treatment was applied in an attempt to obtain polycrystalline mixed metal binary and ternary oxides of the type Co x Zn 1-x Fe 2 O 4 (x = 0; 0.25; 0.5; 0.75; 1). The synthetic procedure used successfully produced single-phased, homogeneous ZnFe 2 O 4 , CoFe 2 O 4 , and Co 0.75 Zn 0.25 Fe 2 O 4 , as well as mixed oxides, whose composition depended both on the duration of the high energy ball milling and the ratio Zn(II)/Co(II). The formation of spinel-like structures was proved by XRD, Mössbauer spectroscopy and Raman spectroscopy. For the characterization of the samples low-temperature N 2 adsorption, UV/Vis spectroscopy and transmission electron microscopy were applied. The energy band gap of the samples was calculated, suggesting they are promising photocatalysts. The decomposition of the Malachite Green in model water solutions under UV-light irradiation was successfully achieved in the presence of the samples as photocatalysts. The highest rate constant was obtained for the sample synthesized at longer milling time in combination with higher Zn(II)/Co(II) ratio. The photocatalytic activity of the ternary mixed oxides was compared with the pure hematite, α-Fe 2 O 3 , and the binary ZnFe 2 O 4 and CoFe 2 O 4 ferrites with spinel structure that were treated in the same way. A synergetic effect of α-Fe 2 O 3 and the spinel-like structure on the photocatalytic properties of ternary mixed metal oxides was detected.

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Characterization and magnetic properties of Sm- and Gd-substituted CoFe2O4 nanoparticles prepared by forced hydrolysis in polyol

Cited by 79 publications

References 21 publications

Evaluation of Antioxidant and Cytotoxicity Activities of Copper Ferrite (CuFe2O4) and Zinc Ferrite (ZnFe2O4) Nanoparticles Synthesized by Sol-Gel Self-Combustion Method

Evaluation of Antioxidant and Cytotoxicity Activities of Copper Ferrite (CuFe2O4) and Zinc Ferrite (ZnFe2O4) Nanoparticles Synthesized by Sol-Gel Self-Combustion Method

Chemical bonding and magnetic properties of gadolinium (Gd) substituted cobalt ferrite

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

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