New Electric Double-Layered Magnetic Fluids Based on Copper, Nickel, and Zinc Ferrite Nanostructures

and, Marcelo Henrique Sousa; Tourinho, F.A.; Depeyrot, J.; Silva, and Geraldo José da; Lara, M.C.F.L.

doi:10.1021/jp0039161

Cited by 264 publications

(150 citation statements)

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“…ZnFe 2 O 4 is one of the most important spinel ferrites which exhibits properties for application as soft magnets and low loss materials at high frequencies (Son et al 2002). Zinc ferrite (ZnFe 2 O 4 ) is of interest not only to basic research in magnetism, but also has great potential in technological applications, such as magnetic materials (Ehrhardt et al 2003;Bid and Pradhan 2003;Kundu et al 2003;Tanaka et al 1998;Grasset et al 2002;Deng et al 2005;Sousa et al 2001), gas sensors (Niu et al 2004), catalysts (Toledo-Antonio et al 2002), photocatalysts (Qiu et al 2004), and absorbent materials (Kobayashi et al 2002(Kobayashi et al , 2002Pineda et al 1997;Ikenaga et al 2004; Toḿ asAlonso and Latasa 2004), and is described by the formula (A)(B) 2 O 4 . Spinel ferrites possess a cubic structure, where (A) and (B) indicate tetrahedral and octahedral cation sites in a face-centered cubic anion (oxygen) sublattice, respectively.…”

Section: Introductionmentioning

confidence: 99%

Role of mode of heating on the synthesis of nanocrystalline zinc ferrite

Chaudhari¹,

Gaikwad

Acharya

2014

Appl Nanosci

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In the present work, microwave-assisted coprecipitation route was used for synthesis of nanocrystalline zinc ferrite and results were compared with conventionally prepared zinc ferrite. Synthesis conditions were kept uniform in both cases, except that the mode of heating was changed. The effects of mode of heating on the material properties were studied systematically. Microstructures of both samples were studied by scanning electron microscopy and transmission electron microscopy and the particle size was found to be in the range of 3-4 nm. Particle size distribution in microwaveprocessed MS-ZnFe 2 O 4 is found to be highly uniform compared to conventionally processed samples (CS-ZnFe 2 O 4 ). XRD data confirmed the presence of single-phase face-centered cubic structure for both the samples. The XRD data fitted well with Reitveld refinement. The functional groups were analyzed by FT-IR. Local distortions in the structures were studied by FT-Raman spectra of zinc ferrites at room temperature. This study concludes that the microwaveassisted synthesis route reduced the time of reaction by around 23 h and developed uniformly distributed fine-scaled particles. This method has high potential to synthesize other ferrite materials also.

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Section: Introductionmentioning

confidence: 99%

Role of mode of heating on the synthesis of nanocrystalline zinc ferrite

Chaudhari¹,

Gaikwad

Acharya

2014

Appl Nanosci

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“…The acquired substance was then grinded into a fine powder. In order to produce nanocrystallites with higher crystallinity and bigger particle size, the as prepared CoFe 2 o each for 7 days. In order to investigate the structural and the microstructure, the two systems under study were subjected to X-ray diffraction analysis using Cu K α radiation.…”

Section: Methodsmentioning

confidence: 99%

“…Hence the inversion parameter decreases which results in the weakening of A-B exchange interaction, therefore, there is a fall in the magnetization value. The detected Curie temperatures (T C ) of CoFe 2 Table 4. displays the phase formation and the calculated magnetic parameters.…”

Section: Magnetization and Hystersis Loop Studiesmentioning

confidence: 99%

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Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals

Eyssa¹

2015

AJPA

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Nano crystalline cobalt ferrite CoFe 2 O 4 powders were synthesized using the coprecipitation method. The effect of the calcination temperature and the Fe 3+ /Co 2+ molar ratio on the phase formation, macro and microstructure and magnetic properties was studied systematically. The Fe 3+ /Co 2+ was controlled to equal 2 and 2.75 while the annealing temperature (T a ) was adjusted to vary from 600 to 1000C o . the obtained powders were investigated using x-ray diffraction (XRD) analysis, Field emission scanning electron microscope (FESEM), Fourir transformation infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM). For both the Fe 3+ /Co 2+ ratios, the XRD results indicat the formation of well crystallized cubic spinel cobalt ferrite phase for the precursors annealed at 600C o up to 1000C o . However a second rhombohedral hematite phase whose content varies respectively from 3% and 15% was formed as the Fe 3+ /Co 2+ varied from 2 to 2.75 at T a =800 and 1000C o . The crystallite size (D β ) as determined applying the win-fit program was found also to decrease from 54.5 to 48.6nm accompanied by an increase of the root mean square strain < e g >. Using Rditveld analysis no effect on the value of the lattice parameter (a) was detected. The FESEM micrographs reveal the formation of highly agglomerated particles for Fe 3+ /Co 2+ =2.75 and T a =1000C o . The FTIR analysis confirm the formation of the spinel structure phase for both Fe 3+ /Co 2+ ratios at 1000C o , however the absorption bands shift to higher frequencies for Fe 3+ /Co 2+ =2.75. Other bands at 1663 and 3472cm -1 ascribed to free or absorbed water molecules were also detected for this ratio. The Fe 3+ /Co 2+ molar ratio was found to have a significant effect on the magnetic properties of the produced cobalt ferrite. The calculated magnetic parameters: the saturation magnetization (M S = 71.219emu/g), the coricivity (H C = 1443.8Oe) and the remanence ratio (M r /M S = 0.405) were recorded to decrease as the Fe 3+ /Co 2+ increases except for the curie temperature (T C ) which increase from 405 to 410C o .

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“…The spinel ferrite has the general formula of M-Fe2O4 where M is a divalent metal ion (Mn, Co, Ni, and Zn etc). Among spinel ferrites, Ni-Zn ferrite (CoFe 2 O 4 ) has an inverse spinel structure and promising magnetic material for high-density recording applications because of their high magneto crystalline anisotropy, high coercivity, moderate saturation magnetization and high chemical and structural stability at higher temperatures, which make it a good candidate for the electronic components used in computers, recording devices, and magnetic cards [5][6][7][8][9].The properties of nanoparticles mostly depend on synthesis method therefore nowadays different synthesis methods are being used for synthesis nanomaterials. Ni-Zn ferrite nanoparticles have been synthesized using various methods, such as co-precipitation method, hydrothermal method, micro emulsion method, sol-gel method, sonochemical reaction method, ball milling, laser ablation and aerosol method [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Structural and Electrical Properties of Ni-Zn Ferrite Nanoparticles: Influence of Mixed Fuel Approach

V.R¹,

Sarnaik²,

Murumkar³

et al. 2017

International Advanced Research Journal in Science, Engineering

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Ni 0.5 Zn 0.5 Fe 2 O 4 (Ni-Zn) ferrite nanoparticles were synthesized by sol-gel auto combustion method using mixed fuel approach (citric acid and ethylene glycol) as a fuel. The metal nitrate to fuel ratio was taken as 1:(1:3). The as synthesized powder of Ni-Zn ferrite nanoparticles is annealed at 650˚C for 5 h and prepared sample was used for characterization and investigations of structural and electrical properties. The structural characterization of Ni-Zn ferrite nanoparticles were done by X-ray diffraction technique. The average crystallite size obtained by Scherrer's formula is of the order of 21 nm. The lattice constant determined from XRD data is in the reported range 8.3783 Å. The DC electrical resistivity was investigated from room temperature to 850 K using two probe techniques. DC electrical resistivity behaviour of Ni-Zn ferrite nanoparticles suggests that the sample is semiconducting in nature.

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New Electric Double-Layered Magnetic Fluids Based on Copper, Nickel, and Zinc Ferrite Nanostructures

Cited by 264 publications

References 25 publications

Role of mode of heating on the synthesis of nanocrystalline zinc ferrite

Role of mode of heating on the synthesis of nanocrystalline zinc ferrite

Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals

Structural and Electrical Properties of Ni-Zn Ferrite Nanoparticles: Influence of Mixed Fuel Approach

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