Correlation of synthesis parameters to the structural and magnetic properties of spinel cobalt ferrites (CoFe2O4) – an experimental and statistical study

Caldeira, Luis Eduardo; Erhardt, Camila Stockey; Mariosi, Fabrício Ravanello; Venturini, Janio; Zampiva, Rúbia Young Sun; Montedo, Oscar Rubem Klegues; Arcaro, Sabrina; Bergmann, Carlos Pérez; Bragança, Saulo Roca

doi:10.1016/j.jmmm.2022.169128

Cited by 16 publications

(4 citation statements)

References 56 publications

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“…The D of the CoY0.1Fe1.9O4 nanopowder was obtained at 15.11, 15.33 and 16.05 nm for sintering temperatures of 200, 300 and 400 °C. The findings are a result of a rise in thermal energy within the crystal structure, which also acquaints atomic diffusion and the crystalline groups' growth [33,34]. This rise in the D due to increased annealing temperatures aligns with previous research reports [29].…”

Section: Resultssupporting

confidence: 88%

Decreasing of Magnetic Saturation of Yttrium Doped Cobalt Ferrite Prepared by the Sol-Gel Auto-Combustion

Rahardjo,

Budiawanti,

Suharno

et al. 2024

Trends Sci

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In this research, a nano-sized cobalt ferrite material doped with Yttrium has been successfully fabricated using the sol-gel method of automatic combustion with variations in low sintering temperatures of 200, 300 and 400 °C. The results of refinement of XRD data using the Rietveld method show that the Yttrium-doped cobalt ferrite compound with a Yttrium concentration molarity of 0.1 possess a cubic crystal system and Fd-3m space group. The increasing annealing temperatures also increase the crystallite size of Yttrium-doped cobalt ferrite with the highest magnitude of 16.05 nm. The FTIR results of the samples indicated the presence of Co-O bonds around wave number 385 cm−1 and Fe-O bonds around wave number 582 cm−1 which are characteristic of the presence of cobalt ferrite compounds. From the VSM measurement results, it can be seen that there is a decrease in magnetic saturation with an increase in annealing temperature. The presence of Yttrium substitution, which takes the place of Fe3+ in cobalt ferrite material, indicates lower saturation magnetization. Image from SEM results showed samples have nanoparticle crystallite size. Evaluation of potential photocatalyst applications using a UV-Visible Spectrophotometer (UV-Vis). For Yttrium doped cobalt ferrite at 200 °C, the best degradation efficiency of Congo Red findings showed a magnitude of 76.10 %; the results are confirmed by the occurrence of the smallest crystallite size (15.11 nm). HIGHLIGHTS Preparation of yttrium-doped cobalt ferrite by the sol-gel auto-combustion method with various annealing temperatures The presence of Yttrium substitution, which takes the place of Fe3+ in cobalt ferrite material, indicates lower saturation magnetization Yttrium-doped cobalt is applied for photocatalytic Congo Red dye in water with the best performance according to the smallest crystallite size GRAPHICAL ABSTRACT

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Section: Resultssupporting

confidence: 88%

Decreasing of Magnetic Saturation of Yttrium Doped Cobalt Ferrite Prepared by the Sol-Gel Auto-Combustion

Rahardjo,

Budiawanti,

Suharno

et al. 2024

Trends Sci

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“…It has been reported that the spinel ferrites which belongs to category of space group Fd-3m usually have five first order Raman active modes namely A 1g , E g and 3T 2g typically within the range of 200-1000 cm −1 wavenumber [36][37][38]. The peak positions, shapes and intensity are reported to be dependent on the composition of the spinel ferrites and their preparation conditions [39,40]. Splitting of peaks often occurs which has been attributed to presence of more than one type of cations [41].…”

Section: Ft-raman Studiesmentioning

confidence: 99%

Law of approach to saturation magnetization with structural and temperature variation in Ni–Zn ferrites

Devi

Singh

2023

Phys. Scr.

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Ni-Zn ferrite of compositional formula Ni0.5Zn0.5Fe2O4 was prepared by co-precipitation method. The effect of heat treatment at 600, 800, 1000 and 1200oC on their structures and hence magnetic properties were investigated. Their phase analysis and morphological studies was done using XRD, FTIR, FT-Raman and SEM-EDAX. Room temperature magnetization loops of the prepared materials were recorded up to a maximum applied field of 15kOe to study the effect of structural variation on magnetic properties. Further, magnetization loops of Ni-Zn ferrite heated at 1200oC were recorded at 150K and 50K to investigate the variation of magnetic properties at low temperatures. Law of approach to saturation magnetization was applied to all the magnetization curves under investigation. The fitted parameters reveal information on the processes of magnetization, anisotropy constant, and saturation magnetization of Ni-Zn ferrites. Law of approach to saturation magnetization in the form = (1− /2) + was also found to be successfully applicable to magnetization curves of all the prepared Ni-Zn ferrites in room temperature as well as low temperatures. Its application and significant results were also discussed in detailed.

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“…The Raman spectra revealed the five active Raman modes, such as T2g (3), Eg (1) and A1g (1), at 151, 311, 470, 547, and 685 cm −1 , respectively [45,46]. In the reverse spinel, the tetrahedral sites of the ferrite were occupied by half of the Fe 3+ cations, whereas the other Fe 3+ and Co 2+ cations were distributed in the octahedral sites.…”

Section: Characterization Of Cofe 2 O 4 Nanoparticlesmentioning

confidence: 99%

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

Cechinel,

Nicolini,

Tápia

et al. 2023

Sustainability

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For the first time, cobalt ferrite spinel (CoFe2O4) was used as a catalyst in the Fenton process for Remazol Red RR dye degradation in water. CoFe2O4 was synthesized via gel combustion using tris(hydroxymethyl)aminomethane as an alternative fuel in one step with a ratio of Ψ = 0.8. Its structural, surface optics, magnetic properties, and the optimal conditions of the Fenton reagents for dye degradation were evaluated. The saturation magnetization and remanence (Ms and Mr, respectively) for the as-prepared powder were 65.7 emu/g and 30.4 emu/g, respectively, and the coercivity (Hc) was 1243 Oe, indicating its ferromagnetic nature and suitability as a magnetic catalyst. Red Remazol RR dye degradation tests were performed using the Fenton process to evaluate the influence of the catalyst dosage and H2O2 concentration. The tests were performed in a batch reactor in the dark with constant agitation for 24 h. The best result was obtained using 1 g/L of catalyst with a dye degradation of 80.6%. The optimal concentration of H2O2 (1.0 M) resulted in 96.5% dye degradation. Nanoparticle recyclability testing indicated that the material could be satisfactorily reused as a catalyst for at least three cycles. The potential use of the CoFe2O4 synthesized in this study as a catalyst for dye degradation by the Fenton process was demonstrated.

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Correlation of synthesis parameters to the structural and magnetic properties of spinel cobalt ferrites (CoFe2O4) – an experimental and statistical study

Cited by 16 publications

References 56 publications

Decreasing of Magnetic Saturation of Yttrium Doped Cobalt Ferrite Prepared by the Sol-Gel Auto-Combustion

Decreasing of Magnetic Saturation of Yttrium Doped Cobalt Ferrite Prepared by the Sol-Gel Auto-Combustion

Law of approach to saturation magnetization with structural and temperature variation in Ni–Zn ferrites

Cobalt Ferrite (CoFe2O4) Spinel as a New Efficient Magnetic Heterogeneous Fenton-like Catalyst for Wastewater Treatment

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