Influence of order-disorder effects on the magnetic and optical properties of NiFe2O4 nanoparticles

Pöttker, Walmir E.; Ono, Rodrigo; Cobos, Miguel Ángel; Hernando, A.; Araújo, Jefferson F.D.F.; Bruno, A. C.; Lourenço, Sidney Alves; Longo, Elson; Porta, Felipe A. La

doi:10.1016/j.ceramint.2018.06.190

Cited by 93 publications

(39 citation statements)

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“…Figure 8 shows the Bragg peaks for the different samples. The largest diffraction angles were for the higher temperature of reaction, and corresponded to lower values of the lattice parameter, confirmed elsewhere [ 31 ].…”

Section: Resultssupporting

confidence: 84%

Study of the Solid-State Synthesis of Nickel Ferrite (NiFe2O4) by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman Spectroscopy

et al. 2021

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Spinel ferrite compounds continue to receive a lot of attention due to their unique properties. Among the numerous synthesis routes existing, the solid-state method was applied for the production of nickel ferrite, by introducing the use of a quartz vial. A mixture of nickel oxide (NiO) and hematite (Fe2O3) was ground and vacuum-sealed in the vial and different thermal treatment programs were tested. The resulting particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. For temperatures, below 1000 °C, the solid-state reaction is not complete as nickel oxide (NiO) and hematite (Fe2O3) are still present. The reaction time is a decisive parameter for the morphology of the particles obtained. If, for different reaction times, the particle size distribution is always between 0.3 and 1.7 µm, a longer reaction time leads to the formation of dense, interconnected clusters of particles. Optimal parameters to synthesize a pure phase of spherical nickel ferrite were sought and found to be a reaction temperature of 1000 °C for 72 h.

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Section: Resultssupporting

confidence: 84%

Study of the Solid-State Synthesis of Nickel Ferrite (NiFe2O4) by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman Spectroscopy

et al. 2021

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“…Sharp peaks observed in the patterns of [27,28]. Moreover, the observed crystal planes indexed as (511) and (440) indicated that the NiFe 2 O 4 phase had crystallized in the inverse spinel structure with Ni 2+ ions occupying half of the octahedral sites over the long-range order [29,30]. No other diffraction peaks were identified in the nickel ferrite ceramic samples, which indicated an absence of impurity phases.…”

Section: Characteristics and Properties Of Nickel Ferrite Ceramics Fabricated By Different Sintering Methodsmentioning

confidence: 93%

Nickel ferrite ceramics: combustion synthesis, sintering, characterization, and magnetic and electrical properties

Vepulanont

Sa-nguanprang

Buapoon

et al. 2021

Journal of Asian Ceramic Societies

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Nickel ferrite powders were prepared by combustion synthesis of Fe, Fe 2 O 3 and NiO using NaClO 4 as fuel. Nickel ferrite ceramics were fabricated by single-step and two-step sintering under various conditions. The effects of each sintering process on the densification, microstructure and properties of the ceramics were investigated. X-ray diffraction analysis of asprepared powders and as-fabricated ceramics confirmed a single-phase NiFe 2 O 4 with a cubic spinel crystal structure. Single-step sintering produced ceramics with a wider density range (3.63-3.97 g/cm 3 ) than two-step sintering (3.74-3.84 g/cm 3 ) and a wider grain size range (1.10-2.31 µm compared to 1.30-1.37 µm). Two-step sintering produced ceramics with greater microhardness (135.00-172.60 HV) than single-step sintering (65.33-153.00 HV). In both methods, higher sintering temperatures produced ceramics with greater saturation magnetization (M s ). The highest M s values were 62.84 emu/g from single-step sintering at 1200°C and 70.00 emu/g from two-step sintering at T 2 = 1150°C: H c was, respectively, 31.18 and 22.00 Oe. The ceramic sintered by the two-step method at T 2 of 1150°C presented superparamagnetic-like behavior of multi-domain magnetic materials, with high µ i and very low H c . The higher electrical resistivity (R), dielectric constant (ε r ) and quality factor of this ceramic support highfrequency data storage applications.

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“…Among the ferrite materials, the NiFe2O4, MgFe2O4, ZnFe2O4, CuFe2O4, MnFe2O4, CoFe2O4, etc., are the familiar magnetic spinel structures. Especially, nickel ferrite is a soft magnetic material performing significant magnetic properties [7][8][9][10][11][12][13][14][15][16][17]. In the same way, the different electrical and magnetic properties were also studied to a larger extent in the case of weak magnetic spinel materials such as MgFe2O4 and ZnFe2O4 [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell

Roumaih¹

2021

Phys. Scr.

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The core-shell of nanoferrites showed quite different properties rather than the nanoferrites counterpart. The nanocomposites of NiFe2O4@MgFe2O4 (NiF@MgF) and ZnFe2O4@MgFe2O4 (ZnF@MgF) are chemically stable and showed very good dielectric and magnetic properties. In this investigation, the temperature-dependent dielectric constant, dielectric loss, and ac-electrical conductivity were measured up to 650 K under different alternating electric field frequencies from 100 Hz to 8 MHz. The obtained data revealed that the mutual effect between the core and the shell samples increases the space charge polarization. Also, the samples showed the semiconducting-metallic behavior which varies between SP, CBH, and QMT models according to the temperatures and the frequencies. Furthermore, the magnetization M(T) was studied of all samples using the Faraday balance method in the temperature range 300-500K. The experimental results of M(T) exhibit good magnetic properties of the core-shell samples, particularly the sample ZnF@MgF. The novelty in this work is an unexpected behavior of ZnF@MgF which possesses magnetization higher than the pure ferrite phase (MgFe2O4), and Curie temperature (TCm) higher than the room temperature. So, the sample ZnF@MgF is a ferrimagnetic substance. Besides, the effective magnetic moment (Eff) and the Curie-Weiss constant () for all samples were obtained from the magnetic susceptibility (T) protocols.

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Influence of order-disorder effects on the magnetic and optical properties of NiFe2O4 nanoparticles

Cited by 93 publications

References 54 publications

Study of the Solid-State Synthesis of Nickel Ferrite (NiFe2O4) by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman Spectroscopy

Study of the Solid-State Synthesis of Nickel Ferrite (NiFe2O4) by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman Spectroscopy

Nickel ferrite ceramics: combustion synthesis, sintering, characterization, and magnetic and electrical properties

Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell

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Influence of order-disorder effects on the magnetic and optical properties of NiFe2O4 nanoparticles

Cited by 93 publications

References 54 publications

Study of the Solid-State Synthesis of Nickel Ferrite (NiFe2O4) by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman Spectroscopy

Study of the Solid-State Synthesis of Nickel Ferrite (NiFe2O4) by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman Spectroscopy

Nickel ferrite ceramics: combustion synthesis, sintering, characterization, and magnetic and electrical properties

Effect of temperature on the dielectric and magnetic properties of NiFe2O4@MgFe2O4 and ZnFe2O4@MgFe2O4 core-shell

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Effect of temperature on the dielectric and magnetic properties of NiFe₂O₄@MgFe₂O₄ and ZnFe₂O₄@MgFe₂O₄ core-shell