Temperature dependent and applied field strength dependent magnetic study of cobalt nickel ferrite nano particles: Synthesized by an environmentally benign method

Sontu, Uday Bhasker; Rao, G. Narsinga; Chou, F. C.

doi:10.1016/j.jmmm.2018.01.003

Cited by 29 publications

(9 citation statements)

References 39 publications

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“…The sharpening and narrowing of the diffraction peaks suggest the crystallite size become more obvious with the annealing temperature [16]. At high annealing temperatures (1000 • C), a significant agglomeration takes place without subsequent recrystallization, supporting the formation of a single crystal instead of a polycrystal structure [5,36]. The lattice constant (a) increases, whereas the X-ray density (d XRD ) decreases with increasing crystallite size.…”

Section: X-ray Diffractionmentioning

confidence: 99%

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Effect of Transition Metal Doping on the Structural, Morphological, and Magnetic Properties of NiFe2O4

2022

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Sol-gel route followed by thermal treatment was used to produce NiFe2O4 doped with transition metal ions (Zn2+, Mn2+, Co2+). The structural, morphological, and magnetic properties of the doped NiFe2O4 were compared with those of virgin NiFe2O4. The metal-glyoxylates’ formation and decomposition as well as the thermal stability of the doped and virgin ferrites were assessed by thermal analysis. The functional groups identified by Fourier-transform infrared spectroscopy confirmed the decomposition of metal nitrates, the formation and decomposition of precursors, and the formation of the SiO2 matrix. The X-ray diffraction indicated that the sol-gel synthesis produced single-phase crystalline ferrites in case of virgin, Zn2+ and Co2+-doped Ni-ferrites. By doping with Mn2+, several secondary phases derived from the SiO2 matrix accompanied the crystalline spinel ferrite. The crystallite sizes depended on the annealing temperature and type of doping ion. The gradual increase of lattice parameters suggested the uniform distribution of doping metal ions in the NiFe2O4 lattice. The saturation magnetization, remanent magnetizations, coercivity, and anisotropy were found to depend on the doping ion, annealing temperature, and particle size. The high saturation magnetization values of the obtained nanocomposites make them suitable for a wide range of applications in the field of sensors development and construction.

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Section: X-ray Diffractionmentioning

confidence: 99%

“…Moreover, the presence of impurity phases with antiparallel magnetic ordering to the ferrite ordering reduces the M S . The doping with Co 2+ ions having higher magnetic moment than Ni 2+ ions result in a decrease of M S , as Ni 2+ ion may occupy both the tetrahedral (A) and octahedral (B) sites [36].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Effect of Transition Metal Doping on the Structural, Morphological, and Magnetic Properties of NiFe2O4

2022

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“…The magnetic measurements provide information about magnetic parameters such as M s , M r , and H c . The M s measurements were done in magnetic fields up to 10 T. In the absence of saturation, M s was estimated by fitting the magnetization vs. field curve M(H) [22]. The magnetic moments per formula unit (n B , in Bohr magnetons) and the multiaxial anisotropy constant (K) for nanoparticles were calculated using the equations presented by Dippong et al [18] and are shown in Table 2.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Influence of Cu2+, Ni2+, and Zn2+ Ions Doping on the Structure, Morphology, and Magnetic Properties of Co-Ferrite Embedded in SiO2 Matrix Obtained by an Innovative Sol-Gel Route

et al. 2020

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This paper presents the synthesis of metal doped Co ferrites, M0.2Co0.8Fe2O4 (M = Cu2+, Ni2+, and Zn2+) embedded in SiO2 matrix by an innovative sol-gel route. The structural and morphological characterization provided information about the crystalline phases, crystallite size, and the shape of the prepared ferrites. The thermal study depicted the thermal decomposition and stability of the obtained ferrites. X-ray diffraction indicated nanocrystalline ferrites with spinel structure and the lack of crystalline phase impurities, while Fourier transform infrared spectroscopy revealed the presence of functional groups in precursors and ferrite powders. The lattice parameters showed a gradual increase indicating a uniform distribution of divalent metal ions in the Co ferrite lattice. The crystallite size, magnetic moment, super-exchange and deflection of magnetic domain were influenced by the dopant metal ion. The room temperature magnetization indicated a ferromagnetic behavior of the ferrites annealed at 1000 °C and a superparamagnetic behavior of the ferrites annealed at 700 °C.

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“…In all cases, the lattice parameter increased with increasing annealing temperature. The differences between the lattice parameter of ferrites were attributed to the different ionic radii of Fe 3+ (tetra: 0.49; octa: 0.64 Å), Zn 2+ (tetra: 0.60; octa: 0.74 Å), Cu 2+ (tetra: 0.57; octa: 0.73 Å), Ni 2+ (tetra: 0.54; octa: 0.78 Å), Mn 2+ (tetra: 0.58; octa: 0.69 Å), and Co 2+ (tetra: 0.58; octa: 0.74Å) [ 29 , 39 , 40 ]. The lattice parameter increased as the particle size increases, probably due to the decrease of surface tension caused by the size effect [ 16 , 20 ].…”

Section: Resultsmentioning

confidence: 99%

Formation, Structure and Magnetic Properties of MFe2O4@SiO2 (M = Co, Mn, Zn, Ni, Cu) Nanocomposites

2021

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The formation, structure, and thermal and magnetic properties of MFe2O4@SiO2 (M = Co, Mn, Zn, Ni, Cu) (60% MFe2O4/40% SiO2) nanocomposites produced by a modified sol-gel method, followed by annealing at 300, 600, 900 and 1200 °C, were studied. The thermal analysis and Fourier transform infrared spectroscopy showed the formation of metal-glyoxylates below 210 °C and their decomposition into the corresponding ferrite around 300 °C. The evolution of crystalline phases and variation of crystallite sizes differs from ferrite to ferrite and depends on the annealing temperature. The magnetic measurements revealed the dependence of saturation and remanent magnetization, coercivity, and anisotropy on ferrite type, annealing temperature, and particle size. By annealing the nanocomposites (NCs) at 1200 °C paramagnetic MnFe2O4, CoFe2O4, NiFe2O4 and CuFe2O4 and antiferromagnetic ZnFe2O4 are obtained.

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Temperature dependent and applied field strength dependent magnetic study of cobalt nickel ferrite nano particles: Synthesized by an environmentally benign method

Cited by 29 publications

References 39 publications

Effect of Transition Metal Doping on the Structural, Morphological, and Magnetic Properties of NiFe2O4

Effect of Transition Metal Doping on the Structural, Morphological, and Magnetic Properties of NiFe2O4

Influence of Cu2+, Ni2+, and Zn2+ Ions Doping on the Structure, Morphology, and Magnetic Properties of Co-Ferrite Embedded in SiO2 Matrix Obtained by an Innovative Sol-Gel Route

Formation, Structure and Magnetic Properties of MFe2O4@SiO2 (M = Co, Mn, Zn, Ni, Cu) Nanocomposites

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