Structure and Magnetic Properties of Co–Ni Spinel Ferrite Particles Synthesized via Co-Precipitation and Hydrothermal Treatment at Different Temperatures

Kishimoto, Mikio; Latiff, Hawa; Kita, Eiji; Yanagihara, Hideto

doi:10.2320/matertrans.m2018347

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…An increase in the annealing temperature treatment also appears in the magnetization remanance (Mr) from 6.11 emu/g to 8.06 emu/g. The increase obtained can also be associated with an increase in grain size, crystallite size, a decrease in porosity, and an increase in the anisotropy constant (K) [34,47,48,49]. The obtained squareness ratio also increases with increasing annealing temperature for lanthanum doped cobalt ferrite nanoparticles.…”

Section: 𝐷 = 𝑘𝜆/𝛽𝑐𝑜𝑠𝜃mentioning

confidence: 83%

The Effect of Annealing Temperature on the Structural and Magnetic Properties of Lanthanum Doped Cobalt Ferrite with the Bengawan Solo River Fine Sediment as the Source of Fe<sup>3+</sup>

Prasetya

Utari

Iriani

et al. 2023

KEM

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The effect of annealing temperature on the structural and magnetic properties of a rare earth (La3+) doped cobalt ferrite with fine sediment from the Bengawan Solo River as the source of Fe3+ has been studied. Co-presipitation method is use for preparation nanoparticles whole this experiment. In order to modified the physical properties, the annealing treatment of 2000C, 3000C, and 4000C are performed. The obtained nanoparticles are characterized their structural properties by using X-ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy. Then, magnetic properties evaluated by using Vibrating Sample Magnetometer (VSM). XRD results have shown that there is an increase in crystallite size with an increase in the given annealing temperature from 24.56 nm to 27.83 nm. The increase in crystallite size can be attributed to the increase in the internal energy of the crystal structure which promotes atomic diffusion. Meanwhile, there is a decrease in the value of the lattice parameter with an increase in the given annealing temperature. The decrease in lattice parameters with increasing crystallite size is generally due to the lattice parameters reaching a minimum energy with increasing crystallite size. The formation of La3+-O2- for the incorporation of rare earth ions into the lattice requires high energy. The FTIR results show an absorption that appears at the peak around ~580 cm-1. This indicates that the La3+ cation has successfully replaced the original structure of cobalt ferrite. The VSM results show that there is an increase in the value of Hc with an increase in the annealing temperature given from 100 Oe to 160 Oe. This is supported by the increase of anisotropy constant and increasing temperature annealing.

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Section: 𝐷 = 𝑘𝜆/𝛽𝑐𝑜𝑠𝜃mentioning

confidence: 83%

The Effect of Annealing Temperature on the Structural and Magnetic Properties of Lanthanum Doped Cobalt Ferrite with the Bengawan Solo River Fine Sediment as the Source of Fe<sup>3+</sup>

Prasetya

Utari

Iriani

et al. 2023

KEM

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“…The measured coercivity 𝐻 𝑐 , which is 30 Oe, is considered a low value compared to that of other nanoparticles prepared by other techniques [34]. The small 𝐻 𝑐 value occurred despite that the cobalt increases the coercivity of Ni ferrite nanoparticles [35]. It is believed that this gives an indication that particles are always superparamagnetic ones.…”

Section: Magnetic Hysteresis Characterizationmentioning

confidence: 88%

Investigation of Static Shear Stress in a Suspension of Co0.2Ni0.8Fe2O4 Nanoparticles in Sesame Oil

Lafta

2023

Ukr. J. Phys.

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Spinel ferrite nanoparticles of Co0.2Ni0.8Fe2O4 composition are utilized as filler magnetic particles in the carrier fluid of sesame oil to prepare a magnetorheological fluid. The hydrothermal method is adopted to prepare CoNi ferrite nanoparticles. X-ray diffraction analysis is used to check the crystalline phase, and transmission electron microscopy is used to image the particles to find the size and shape of particles. The average size is about 18 nm. The magnetic properties are determined by measuring the hysteresis loop by the superconducting quantum interference device technique. The saturation magnetization is 59.4 emu/g, and the coercivity is 30 Oe. The Langevin fitting is applied to the hysteresis loop to show that the particle moment is about 16 × 103 μB. The viscosity and shear stress are measured against the shear rate, where the latter parameters are extracted from the viscosity and the viscometer spindle speed. The viscosity behavior showed the shear thinning against the shear rate. The viscosity increases with the magnetic field. The shear stress increases with the shear rate and has a very good matching with the Bingham model, rather than with the Herschel–Bulkley model, while describing the measured data. We observed a clear high static shear stress at low shear rates that are growing with the magnetic field. The yield stress was increased linearly with magnetic field strength.

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“…We have been studying the mechanism generating a high coercive force in the Co-Ni spinel ferrite particles, with the particular intention of applying the particles to permanent magnets. 27,28) In that study, we reported a maximum coercive force of 519 kA m −1 and saturation magnetization of 60.4 Am 2 kg −1 in Co-Ni spinel particles that were synthesized through co-precipitation, hydrothermal treatment, and etching in hydrochloric acid (HCl). Moreover, our Mössbauer analyzes showed the perfect inverted spinel structure of particles.…”

Section: Introductionmentioning

confidence: 99%

Coercive force of Co–Ni–Li spinel ferrite particles synthesized through co-precipitation, hydrothermal treatment, and etching in hydrochloric acid

Kishimoto¹,

Kita²,

Yanagihara³

2020

Jpn. J. Appl. Phys.

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Co–Ni and Co–Ni–Li spinel ferrite particles were synthesized via chemical co-precipitation, hydrothermal treatment, and etching in hydrochloric acid. The particles were approximately 30 nm in size and showed typical XRD patterns of spinel structure with a lattice constant of 0.838 nm, similar to that in Fe3O4 crystals. The coercive force was 227 kA m−1 and 508 kA m−1 for Co–Ni and Co–Ni–Li spinel ferrite particles, respectively. The magnetic anisotropy field in Co–Ni–Li spinel ferrite particles estimated from rotational hysteresis losses was remarkably higher than that of Co–Ni spinel ferrite particles. Although the A- and B-sites in the spinel structure were considered to have been filled by metal ions in both particles, the positive charge calculated from the composition of Co–Ni–Li spinel ferrite particles was smaller than that in the Co–Ni spinel ferrite particles. Some defects introduced in the particles due to the composition may give some effects on the high coercive force.

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Structure and Magnetic Properties of Co–Ni Spinel Ferrite Particles Synthesized via Co-Precipitation and Hydrothermal Treatment at Different Temperatures

Cited by 4 publications

References 16 publications

The Effect of Annealing Temperature on the Structural and Magnetic Properties of Lanthanum Doped Cobalt Ferrite with the Bengawan Solo River Fine Sediment as the Source of Fe<sup>3+</sup>

The Effect of Annealing Temperature on the Structural and Magnetic Properties of Lanthanum Doped Cobalt Ferrite with the Bengawan Solo River Fine Sediment as the Source of Fe<sup>3+</sup>

Investigation of Static Shear Stress in a Suspension of Co0.2Ni0.8Fe2O4 Nanoparticles in Sesame Oil

Coercive force of Co–Ni–Li spinel ferrite particles synthesized through co-precipitation, hydrothermal treatment, and etching in hydrochloric acid

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