Synthesis and characterization of NiFe2O4 nanoparticles and nanorods

Sivakumar, Periyasamy; Ramesh, R.; Ramanand, A.; Ponnusamy, S.; Muthamizhchelvan, C.

doi:10.1016/j.jallcom.2013.02.077

Cited by 181 publications

(83 citation statements)

References 31 publications

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“…5(a) shows Raman spectra in the range of 100-1000 cm Table II which are in good agreement with the reported values. 13,14 The observed band at 202 cm -1 indicates the presence of possible traces of hematite in the nanoparticles. Their fraction in the sample decreases with increase of annealing temperature that resulted in lowering the intensity of 202 cm -1 band.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…In nanoparticles, magnetic moments can be affected by several factors such as residual stress, disorders in grains, canted surface spins, oxygen deficient regions, cation inversion, grain size, grain boundary pinning and strain with increasing surface area, etc. 14,15 These effects lead to the structural and magnetic disorders. Randomly oriented grains associated with anisotropy in localized regions impede the domain wall movement.…”

Section: Magnetic Studiesmentioning

confidence: 99%

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Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles

et al. 2015

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We report here the investigations on the size dependent variation of magnetic properties of nickel ferrite nanoparticles. Nickel ferrite nanoparticles of different sizes (14 to 22 nm) were prepared by the sol-gel route at different annealing temperatures. They are characterized by TGA-DTA, XRD, SEM, TEM and Raman spectroscopy techniques for the confirmation of the temperature of phase formation, thermal stability, crystallinity, morphology and structural status of the nickel ferrite nanoparticles. The magnetization studies revealed that the saturation magnetization (Ms), retentivity (Mr) increase, while coercivity (Hc) and anisotropy (Keff) decrease as the particle size increases. The observed value of Ms is found to be relatively higher for a particle size of 22 nm. In addition, we have estimated the magnetic domain size using magnetic data and correlated to the average particle size. The calculated magnetic domain size is closely matching with the particle size estimated from XRD. Impedance spectroscopy was employed to study the samples in an equivalent circuit to understand their transport phenomena. It shows that nickel ferrite nanoparticles exhibit a non-Debye behavior with increasing particle size due to the influence of increasing disorders, surface effects, grain size and grain boundaries, etc.

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Section: Raman Spectroscopymentioning

confidence: 99%

Section: Magnetic Studiesmentioning

confidence: 99%

Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles

et al. 2015

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“…Then, the A sites of the nickel-ferrites are likely to mostly be occupied by Fe 3+ ions, exhibiting inverse-spinel nature. Such octahedral preference of Ni 2+ ions was reported in a number of nickel-ferrite systems [10][11][12]. When Ni 2+ ion subsists at the B site, its ionic radius is known to be about 0.083 nm, significantly smaller than that of the octahedral Fe 2+ ion (0.092 nm) [13].…”

Section: +mentioning

confidence: 69%

Structural Phase Transition, Electronic Structure, and Magnetic Properties of Sol-gel-prepared Inverse-spinel Nickel-ferrites Thin Films

Kim¹,

Kim²,

Kim³

2014

Journal of Magnetics

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X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM) were used to investigate the influence of Ni ions on the structural, electronic, and magnetic properties of nickelferrites (Ni x Fe 3-x O 4 ). Spinel Ni x Fe 3-x O 4 (x ≤ 0.96) samples were prepared as polycrystalline thin films on Al 2 O 3 (0001) substrates, using a sol-gel method. XRD patterns of the nickel-ferrites indicate that as the Ni composition increases (x > 0.3), a structural phase transition takes place from cubic to tetragonal lattice. The XPS results imply that the Ni ions in Ni x Fe 3-x O 4 substitute for the octahedral sites of the spinel lattice, mostly with the ionic valence of +2. The minority-spin d-electrons of the Ni 2+ ions are mainly distributed below the Fermi level (E F ), at around 3 eV; while those of the Fe 2+ ions are distributed closer to E F (~1 eV below E F ). The magnetic hysteresis curves of the Ni x Fe 3-x O 4 films measured by VSM show that as x increases, the saturation magnetization (M s ) linearly decreases. The decreasing trend is primarily attributable to the decrease in net spin magnetic moment, by the Ni 2+ (2 µ B ) substitution for octahedral Fe 2+ (4 µ B ) site.

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“…[8], have advantages over physical methods because of low cost, the reaction taking place at room temperature and large scale possibility [9]. Among the methods, co-precipitation method is the most effective methods and relative simple.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) Encapsulated Zn_0.5Ni_0.5Fe₂O₄ Magnetic Nanoparticles

Widakdo

Istikhomah

Rifianto

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. Nanocrystalline mixed spinel ferrite of Zn 0.5 Ni 0.5 Fe 2 O 4 magnetic nanoparticles (MNPs) has been successfully synthesized by coprecipitation method and encapsulated and PEG-4000 with various concentrations. X-Ray Diffraction (XRD) patterns showed that nanoparticles contained Zn 0.5 Ni 0.5 Fe 2 O 4 spinel ferrite with the particles size of 15.2 nm. After PEG-4000 encapsulation, particles size decrease became 13.3 nm. Transmission Electron Microscopy (TEM) image showed that the nanoparticles still aglomerate after PEG-4000 encapsulation. The coercivity ( ) of Zn 0.5 Ni 0.5 Fe 2 O 4 was 50.7 Oe. The decrease after PEG-4000 encapsulation became 47.9 Oe, respectively. It is due to the decrease of particle size. The saturation magnetization ( ) of Zn 0.5 Ni 0.5 Fe 2 O 4 was 18.4 emu/g, and decrease to 17.1 emu/g after PEG-4000 encapsulation. This is because PEG-4000 has paramagnetic properties.

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Synthesis and characterization of NiFe2O4 nanoparticles and nanorods

Cited by 181 publications

References 31 publications

Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles

Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles

Structural Phase Transition, Electronic Structure, and Magnetic Properties of Sol-gel-prepared Inverse-spinel Nickel-ferrites Thin Films

Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) Encapsulated Zn_0.5Ni_0.5Fe₂O₄ Magnetic Nanoparticles

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Synthesis and characterization of NiFe2O4 nanoparticles and nanorods

Cited by 181 publications

References 31 publications

Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles

Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles

Structural Phase Transition, Electronic Structure, and Magnetic Properties of Sol-gel-prepared Inverse-spinel Nickel-ferrites Thin Films

Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) Encapsulated Zn0.5Ni0.5Fe2O4 Magnetic Nanoparticles

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Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) Encapsulated Zn_0.5Ni_0.5Fe₂O₄ Magnetic Nanoparticles