Calcination effects on the crystal structure and magnetic properties of CoFe2O4 nanopowders synthesized by the coprecipitation method

Márquez, Gerson; Sagredo, V.; Guillén-Guillén, Rosmary; Attolini, G.; Bolzoni, F.

doi:10.31349/revmexfis.66.251

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…The particle size distributions are of the Lognormal type, with standard deviations between 0.35 and 0.47, and mean particle sizes between 34 and 42 nm. The mean particle sizes of each compound are tabulated in Table II, and are similar to those reported in other investigations where nanoparticulate powders have been produced by similar synthesis routes and where the powders have been calcined at temperatures between 600 and 800°C [15], [20]. Fig.…”

Section: Resultssupporting

confidence: 73%

“…Co1-xNixFe2O4 (x = 0.0, 0.2, 0.4, 0.5) nanoparticles were synthesized by the coprecipitation method, using cobalt(II) nitrate hexahydrate, nickel(II) nitrate hexahydrate, and iron(III) nitrate nonahydrate as metal precursors, and ammonium hydroxide (29.66 wt% in water) as the precipitating agent. The synthesis procedure described in [20] was followed. To improve the crystallinity of the nanoparticles, the obtained powders were heat treated at 800 °C, for 2 hours, in a tubular furnace with an air atmosphere.…”

Section: A Synthesis Of Nanoparticlesmentioning

confidence: 99%

“…Various methods have been used for the synthesis of ferrite nanoparticles, such as: coprecipitation [14], sol-gel [15], autocombustion [16], hydrothermal synthesis [17], microemulsion [18], reverse micelles [19]. Chemical coprecipitation has proven to be a simple, fast, and low-cost synthesis method that allows obtaining nanoparticulate powders [20]. By replacing Co 2+ cations with Ni 2+ in cobalt ferrite, changes in the cation distribution occur at the tetrahedral and octahedral sites of the spinel structure, due to differences in the inversion degrees of CoFe2O4 and NiFe2O4.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

Márquez¹,

Sagredo²

2023

Proceedings of the 21th LACCEI International Multi-Conference for Engineering, Education and Technology (LACCEI 2023): “Leaders

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Ni1-xCoxFe2O4 (x = 1.0, 0.8, 0.6, and 0.5 ) nanoparticles were synthesized using the coprecipitation method and subsequent thermal treatment at 800 °C. The structural characterization of the nanoparticles was carried out using X-ray Diffraction, finding that all the compounds presented a single crystalline phase corresponding to the cubic spinel structure. As the concentration of Ni in the compounds increases, a decrease in the lattice parameter was obtained because of the fact that Ni 2+ cations are smaller than Co 2+ . The size, morphology and dispersion of the nanoparticles were analyzed by Transmission Electron Microscopy, finding that the nanocompounds are formed by aggregates of nanoparticles with irregular shapes and mean particle sizes between 34 and 42 nm. The magnetic properties of CoFe2O4 and Co0.5Ni0.5Fe2O4 nanoparticles were studied from magnetization measurements as a function of temperature, in ZFC and FC modes, and magnetization measurements as a function of the applied magnetic field. It was obtained that the nanoparticles are in the blockedmagnetic regime in the temperature range from 5 to 320 K. At 5 K, the compounds have large coercive fields of 10683 and 7518 Oe, for CoFe2O4 and Co0.5Ni0.5Fe2O4, respectively. It was found that the values of saturation magnetization, remanent magnetization, and coercive field decrease when replacing Co 2+ by Ni 2+ in Co ferrite, because the magnetic moments of divalent nickel cations are smaller than those of Co 2+ cations.

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Section: Resultssupporting

confidence: 73%

Section: A Synthesis Of Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

Márquez¹,

Sagredo²

2023

Proceedings of the 21th LACCEI International Multi-Conference for Engineering, Education and Technology (LACCEI 2023): “Leaders

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“…The peaks seen at 559.09, 551.49, and 551.06 cm −1 , respectively, indicate the stretching vibrations of the Fe 3+ –O 2− bonds located in the tetrahedral region. Marquez et al 20 . reported that in the FTIR spectrum of CoFe 2 O 4 nanoparticles, Co 2+ –O = and Fe 3+ –O = bonds located in the tetrahedral and octahedral regions give a vibration frequency at 590 and 394 cm −1 respectively.…”

Section: Resultsmentioning

confidence: 99%

Characterization and magnetic properties of CoFe₂O₄ nanoparticles synthesized by the co‐precipitation method

Bayça

2023

Int J Applied Ceramic Tech

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In this study, the characterization and magnetic properties of CoFe2O4 nanoparticles synthesized by co‐precipitation method were investigated. The calcined products obtained were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X‐ray (EDAX), Fourier transformed infrared (FTIR) spectroscopy, and vibrating sample magnetometer. Crystallite size and phase composition were analyzed by X‐ray diffraction. Crystallite size and phase composition were analyzed by X‐ray diffraction. The average crystallite size of CoFe2O4 nanoparticles increased in the range of 15.85–32.14 nm with an increase in temperature from 500 to 700°C. It was observed that spherical CoFe2O4 nanoparticles were produced. Synthesis of CoFe2O4 nanoparticles was confirmed using XRD, SEM‐EDAX, and FTIR analyses. The effect of crystallite size, calcination temperature, and lattice parameter on saturation magnetization, remanent magnetization, coercivity, and magnetocrystalline anisotropy were investigated by vibrating sample magnetometer. As the crystallite size value increased, magnetocrystalline anisotropy also increased.

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“…Since the SPD method pointed out that the loops were minor loops, the narrowing of the loop along the field axis could be attributed to minor loop effects. The saturation magnetization (Ms) values were then estimated from the relationship reported by Marquez et al [121,134]…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

Synthesis and characterization of magnetic iron oxide nanoparticles.

Ndlovu

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Three high-purity cubic spinel-type crystalline magnetic iron oxides i.e. Fe3O4, CoFe2O4, and NiFe2O4 nanoparticles were successfully synthesized by co-precipitation method. X-ray diffraction (XRD) showed the formation of stoichiometric phases with average particle size of 11.7 nm, 23.6 nm, and 16.4 nm for the as-prepared Fe3O4, CoFe2O4, and NiFe2O4 nanoparticles, respectively. Transmission electron microscopy (TEM) observation for all three samples revealed spherical morphology with single magnetic domain structure. From high resolution TEM (HR-TEM) imaging, lattice fringes with d-spacing of 0.473 nm and 0.248 nm corresponding to (111) and (311) reflections planes, were observed for both the Co-doped and Ni-doped samples. Energy-dispersive x-ray spectroscopy (EDX) analysis showed the presence and homogeneous distribution of main elements Fe, O, Co, and Ni in the samples. Quantitative EDX results confirmed the formation of stoichiometric CoFe2O4 and NiFe2O4 phases with the experimentally measured weight wt% of the samples closely equal to the theoretical calculated wt% values i.e. Fe = 46.35 wt%, O = 26.79 wt%, and Co = 26.87 wt% for CoFe2O4, and Fe = 47.02 wt%, O = 27.27 wt%, and Ni = 24.75 wt% for NiFe2O4. The magnetic properties of these nanoparticles were investigated by 57-Fe Mossbauer spectroscopy (MS) and Vibrating Sample Magnetometer (VSM) techniques. Room temperature MS spectrum for the pure Fe3O4 phase consist of two superimposed sextets with isomer shifts (0.321, 0.463) mm/s and hyperfine field (57.3, 43.4) T attributed to tetrahedral (A-sites) and octahedral (B-sites). The CoFe2O4 and NiFe2O4 samples both showed room temperature MS spectra consisting of two sextets and a single central paramagnetic doublet. The two sextets in each sample had almost equal isomer shifts for both A- and B-sites i.e. 0.2956 & 0.3247 mm/s and 0.3784 & 0.2761 mm/s for each of the sites of the CoFe2O4 and NiFe2O4 sample, respectively. The paramagnetic doublet was fitted with isomer shift of 0.3272 mm/s for the CoFe2O4 sample and 0.3249 mm/s for the NiFe2O4 sample. Temperature dependence M-T magnetization curves measured at H = 500 Oe inthe zero-field-cooled (ZFC) and field-cooled (FC) conditions showed the superparamagnetic nature of all three particles. The MZFC magnetization curve showed a maximum (cusp) at 225 K, 300 K, and 228 K corresponding to blocking temperature (TB), for Fe3O4, CoFe2O4, and NiFe2O4, respectively. For the CoFe2O4 sample the irreversibility temperature (Tirr) was equal to the blocking temperature (TB). While measured Tirr for Fe3O4 and NiFe2O4 was 300 K for both samples. The M-H magnetization curves at 300 K for all three samples revealed the coexistence of ferrimagnetic and superparamagnetic behaviour of the nanoparticles. At 300 K all three samples exhibit symmetrical and almost "closed" hysteresis loops with coercivity approximately 36, 70, and 117 Oe and remanence magnetization of approximately 5, 3, and 4 emu/g, for Fe3O4, NFe2O4, and CoFe2O4, respectively. Furthermore, M-H measurements at 300 K showed a high saturation magnetization of 89 emu/g for the Fe3O4 sample compared to 37 emu/g and 26 emu/g for the CoFe2O4, and NiFe2O4, respectively. M-H measurements recorded at low temperatures showed rather "opened" hysteresis loops compared to loops measured at 300 K. In contrast to saturated magnetization M-H curves for the Fe3O4 and NiFe2O4 nanoparticles, unsaturated M-H loops were observed for CoFe2O4 sample in the temperature range 10 - 100 K. A significant increase in coercivity to 102 Oe, 391 Oe, and 2.4 kOe was observed for Fe3O4, NiFe2O4, and CoFe2O4, respectively, when the temperature was reduced from 300 K to 10 K. For the CoFe2O4 sample, a highest coercivity of 2.7 kOe was measured at 100 K. And finally, M-H data at 10 K showed high saturation magnetization of 100 emu/g, 51 emu/g, and 31 emu/g, for the pure magnetite, CoFe2O4, and NiFe2O4 samples, respectively.

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Calcination effects on the crystal structure and magnetic properties of CoFe2O4 nanopowders synthesized by the coprecipitation method

Cited by 11 publications

References 26 publications

Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

Characterization and magnetic properties of CoFe₂O₄ nanoparticles synthesized by the co‐precipitation method

Synthesis and characterization of magnetic iron oxide nanoparticles.

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Calcination effects on the crystal structure and magnetic properties of CoFe2O4 nanopowders synthesized by the coprecipitation method

Cited by 11 publications

References 26 publications

Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

Characterization and magnetic properties of CoFe2O4 nanoparticles synthesized by the co‐precipitation method

Synthesis and characterization of magnetic iron oxide nanoparticles.

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Product

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Characterization and magnetic properties of CoFe₂O₄ nanoparticles synthesized by the co‐precipitation method