Magnetic properties of nanosize NiFe2O4 particles synthesized by pulsed wire discharge

Kinemuchi, Yoshiaki; Ishizaka, Kazuhiro; Suematsu, Hisayuki; Jiang, Weihua; Yatsui, Kiyoshi

doi:10.1016/s0040-6090(02)00021-4

Cited by 179 publications

(88 citation statements)

References 7 publications

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“…In fact, since the nanoparticles are the mixed spinel structure type rather than the inverse spinel structure type (bulk) because of the presence of Co 3+ ions and also a cation distribution with cobalt ions on the tetrahedral site [44], the saturation magnetization is reduced [45]. In addition, the appearance of the weakly magnetic, impure phase of hematite (shown in Figure 2(c)) can reduce the saturation magnetization [18,46]. The variations of saturation magnetization and coercivity field with particle size and calcination temperature for cobalt ferrite nanoparticles are listed in Table 1.…”

Section: Phase Composition and Morphology Of Precursors Andmentioning

confidence: 99%

An Overview on Nanocrystalline ZnFe₂O₄, MnFe₂O₄, and CoFe₂O₄ Synthesized by a Thermal Treatment Method

Naseri

Saion

Kamali

2012

ISRN Nanotechnology

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This study reports the simple synthesis of MFe 2 O 4 (where M = Zn, Mn, and Co) nanoparticles by a thermal treatment method, followed by calcination at various temperatures from 723 to 873 K. Poly(vinyl pyrrolidone) (PVP) was used as a capping agent to stabilize the particles and prevent them from agglomeration. The characterization studies were conducted by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The average particle sizes were obtained by TEM images, which were in good agreement with the XRD results. Fourier transform infrared spectroscopy (FT-IR) confirmed the presence of metal oxide bands for all the calcined samples. Magnetic properties were demonstrated by a vibrating sample magnetometer (VSM), which displayed that the calcined samples exhibited superparamagnetic and ferromagnetic behaviors.

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Section: Phase Composition and Morphology Of Precursors Andmentioning

confidence: 99%

An Overview on Nanocrystalline ZnFe₂O₄, MnFe₂O₄, and CoFe₂O₄ Synthesized by a Thermal Treatment Method

Naseri

Saion

Kamali

2012

ISRN Nanotechnology

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“…Cr ions occupy tetrahedral site and the rest occupy octahedral site [2]. Thus, structurally both these compounds are quite different.…”

Section: Introductionmentioning

confidence: 98%

“…NiCr 2 O 4 and NiFe 2 O 4 ferrimagnets crystallizes into normal and inverse spinel structures respectively with magnetic Ni 2 ion occupying tetrahedral site in the former and octahedral site in the latter [1,2]. Cr ions occupy tetrahedral site and the rest occupy octahedral site [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄

et al. 2018

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At room temperature, the normal oxide spinel NiCr2O4 is tetragonally distorted and crystallizes in the I41/amd space group due to cooperative Jahn-Teller ordering driven by the orbital degeneracy of tetrahedral Ni 2 . The ferrimagnetic Curie temperature (TCq for NiCr2O4 is 74 K. The magnetic moments of NiCr2O4 are composed of a ferrimagnetic (longitudinal) and an antiferromagnetic (transverse) component. Exchange interaction between the magnetic cations influences the overall magnetic properties of the compound. Present work focuses on the modification of structural and magnetic properties upon substituting Fe at Cr site in NiCr2O4 with the motivation of changing the magnetic exchange interaction. In order to do so, single phase Ni(Cr0.5Fe0.5q2O4 samples were prepared by co-precipitation techniques, while controlling the pH of precipitation. Upon Fe substitution, crystal structure was not affected much contrary to the earlier reports. In order to determine the oxidation state of each elements X-ray photoelectron spectroscopy (XPS) was performed. TC was found to increase dramatically above 300 K, confirmed both from temperature and field dependent dc-magnetization studies.

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“…The ferrimagnetism arises due to antiparallel spin of Fe 3+ ions present at tetrahedral sites and Ni 2+ occupying octahedral sites. 30 The Nickel ferrite is considered as the efficient magnetic material which has good electrical resistivity, high-Curie temperature and chemical stability. Magnetic nanoparticles of nickel ferrite have been used to manufacture titaniacoated nickel ferrite, which can act as magnetically separable photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen doped Graphene Nickel Ferrite Magnetic Photocatalyst for the Visible Light Degradation of Methylene Blue

Singh

Ladol

Khajuria

et al. 2017

ACSi

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A facile approach has been devised for the preparation of magnetic NiFe 2 O 4 photocatalyst (NiFe 2 O 4 -NG) supported on nitrogen doped graphene (NG). The NiFe 2 O 4 -NG composite was synthesized by one step hydrothermal method. The nanocomposite catalyst was characterized by Powder X-ray diffraction (PXRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Ultraviolet-visible spectroscopy (UV-Vis) and Vibrating sample magnetometry (VSM). It is found that the combination of NiFe 2 O 4 nanoparticles with nitrogen-doped graphene sheets converts NiFe 2 O 4 into a good catalyst for methylene blue (MB) dye degradation by irradiation of visible light. The catalytic activity under visible light irradiation is assigned to extensive movement of photogenerated electron from NiFe 2 O 4 to the conduction band of the reduced NG, effectively blocking direct recombination of electrons and holes. The NiFe 2 O 4 nanoparticles alone have efficient magnetic property, so can be used for magnetic separation in the solution without additional magnetic support.

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Magnetic properties of nanosize NiFe2O4 particles synthesized by pulsed wire discharge

Cited by 179 publications

References 7 publications

An Overview on Nanocrystalline ZnFe₂O₄, MnFe₂O₄, and CoFe₂O₄ Synthesized by a Thermal Treatment Method

An Overview on Nanocrystalline ZnFe₂O₄, MnFe₂O₄, and CoFe₂O₄ Synthesized by a Thermal Treatment Method

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄

Nitrogen doped Graphene Nickel Ferrite Magnetic Photocatalyst for the Visible Light Degradation of Methylene Blue

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Magnetic properties of nanosize NiFe2O4 particles synthesized by pulsed wire discharge

Cited by 179 publications

References 7 publications

An Overview on Nanocrystalline ZnFe2O4, MnFe2O4, and CoFe2O4 Synthesized by a Thermal Treatment Method

An Overview on Nanocrystalline ZnFe2O4, MnFe2O4, and CoFe2O4 Synthesized by a Thermal Treatment Method

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr2O4

Nitrogen doped Graphene Nickel Ferrite Magnetic Photocatalyst for the Visible Light Degradation of Methylene Blue

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An Overview on Nanocrystalline ZnFe₂O₄, MnFe₂O₄, and CoFe₂O₄ Synthesized by a Thermal Treatment Method

An Overview on Nanocrystalline ZnFe₂O₄, MnFe₂O₄, and CoFe₂O₄ Synthesized by a Thermal Treatment Method

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄