The crystallographic, magnetic properties of Al, Ti doped CoFe2O4 powders grown by sol–gel method

Chae, Kwang Pyo; Lee, Jae-Gwang; Kweon, Hyzzuck Su; Lee, Young Bae

doi:10.1016/j.jmmm.2004.05.010

Cited by 65 publications

(24 citation statements)

References 12 publications

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“…Reports are also available on Al as well as Ti substituted CoFe 2 O 4 by Sol-Gel methods with saturation magnetization of 72.1 and 62.6 emu/gm respectively. 20 Comparitively, all these reports show low values of magnetization as well as mismatch to the synthesized particle size. Ni is a ferromagnetic metal which magnetizes easily even at room temperature, hence to increase the magnetization value of the CoFe 2 O 4 , an attempt has been made to substitute the divalent Ni into the CoFe 2 O 4 .Singhal et al 21 have prepared the nanoparticles of the series of Ni substituted CoFe 2 O 4 by using the aerosol chemical route.…”

Section: Introductionmentioning

confidence: 95%

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

et al. 2015

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Microstructure and magnetic properties of MFe 2 O 4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method Journal of Applied Physics 117, 17A328 (2015) Nickel substituted cobalt ferrite nanoparticles with composition Co 1−x Ni x Fe 2 O 4 (0.0≤x≤1.0) was synthesized using simple, low temperature auto combustion method. The X-ray diffraction patterns reveal the formation of cubic phase spinel structure. The crystallite size varies from 30-44 nm with the nickel content. Porous and agglomerated morphology of the bulk sample was displayed in the scanning electron microscopy. Micro Raman spectroscopy reveals continuous shift of E g and E g (2) stokes line up to 0.8 Ni substitution. The dispersion behavior of the dielectric constant with frequency and the semicircle nature of the impedance spectra show the cobalt nickel ferrite to have high resistance. The ferromagnetic nature is observed in all the samples, however, the maximum saturation magnetization was achieved by the 0.4 Ni substituted cobalt ferrite, which is up to the 92.87 emu/gm at 30K. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Section: Introductionmentioning

confidence: 95%

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

et al. 2015

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“…[18][19][20][21][22] Several researchers have reported on Ti, Y, Gd, Pr, Zn, Ni and Dy doped cobalt ferrite. [23][24][25][26][27][28] The present work is focused on the effects of Al 3+ doping on the structural, morphological and elastic properties of aluminium ion doped cobalt ferrite obtained via sol-gel method. The X-ray powder diffraction patterns, the microstructure and the elastic properties are discussed as a function of the Al 3+ doping.…”

Section: Introductionmentioning

confidence: 99%

Al and PEG Effect on Structural and Physicochemical Properties of CoFe2O4

Mostaghni

Abed

2017

Mat. Res.

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In this work, pure and Alumina doped cobalt ferrite nanoparticles CoFe 2−x Al x O 4 (for x = 0.44) have been synthesized by the sol gel method. The influence of alumina doping on the morphological and mechanical properties of CoFe 2 O 4 nano-particles were investigated by means of X-ray powder diffraction (XRD) and rietveld analysis. XRD analysis confirmed that the single phase formation of pure nano particles with the expected cubic inverse spinel structure with Fd3m space group and without any impurity phase. Alumina doping were led to a decrease in the crystallite size, lattice parameter, elastic constants and magnitude of moduli. It is explained on the basis of the replacement of Fe ions with half-filled d-shell (3d 5 ) and larger radius by Al 3+ ions with a completely filled shell (2p 6 ) and smaller radius.

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“…Nanosize ferrites have been prepared by various methods including sol-gel, modified oxidation process, forced hydrolysis method, ball milling and microemulsion method [7][8][9][10][11][12]. Recently, the chemical route for material preparation was preferred as an effective and convenient technique, with reduced energy and material requirements [13,14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic properties of octahedral ferrite NiχCo1−χ Fe2O4 nanocrystals

et al. 2007

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A series of Ni doped cobalt ferrite compounds with the formula Ni x Co 1−x Fe 2 O 4 where x=0, 0.2, 0.4, 0.6, 0.8, and 1.0 were prepared using a hydrothermal method and subsequently sintered/annealed at 600• C for 3 h. The influence of the Ni content on the lattice parameter, a, stretching vibration and the magnetization of specimens were subsequently studied. XRD and FTIR were used to investigate structure and composition variations. All samples were found to have a cubic spinel structure. SEM was used to study morphological variations. The results indicate that the average particle sizes are between 30-35 nm with a narrow size distribution along with nanocrystals forming of regular octahedrons. A decrease in the peak to peak line width and increase in resonance field with increasing Ni content were observed from ESR measurements. Based on ESR results, a core-shell type of formation was proposed where the core is made up of undoped CoFe 2 O 4 and the shell is Ni 2+ doped CoFe 2 O 4 .

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The crystallographic, magnetic properties of Al, Ti doped CoFe2O4 powders grown by sol–gel method

Cited by 65 publications

References 12 publications

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

Al and PEG Effect on Structural and Physicochemical Properties of CoFe2O4

Synthesis and magnetic properties of octahedral ferrite NiχCo1−χ Fe2O4 nanocrystals

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