Study on structure and magnetic properties of rare earth doped cobalt ferrite: The influence mechanism of different substitution positions

Jing, Xiaodong; Guo, Mohan; Li, Ziyus; Qin, Ciyu; Chen, Zitao; Li, Zuoguang; Gong, Huayang

doi:10.1016/j.ceramint.2022.12.286

Cited by 24 publications

(4 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(8) (9) In multidomain, the relationship between the coercivity field and the anisotropy constant is expressed in the following equation: (10) where, e and f are constants, and D is the size of the crystallite. Therefore, the coercivity decreases as the crystallite size increases, causing the anisotropy constant to also decrease [34].…”

Section: Equations For Calculationsmentioning

confidence: 99%

“…When La 3+ enters an octahedral site, it tends to displace the Fe 3+ ion, because it has the same ion size. In the case of inverted spinel at the tetrahedral site, ion charging is more dominant over the 3+ ion so that Fe 3+ moves to the tetrahedral site after La 3+ replaces the Fe 3+ ion at the octahedral site [10]. Cobalt ferrite has interesting characteristics that open up application opportunities [7], such as; permanent magnets [11], magnetic sensors [12], photocatalyst [13], antibacterial [14], drug delivery [15], and MRI agent contrast [16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lanthanum-substituted Cobalt Ferrite Established by the Co-precipitation Process: Annealing Temperature Adjustment of Structural, Magnetic, and Dye Removal Characteristics

Rahmawati,

Musadewi,

Prasetya

et al. 2023

Bull. Chem. React. Eng. Catal.

View full text Add to dashboard Cite

Co-precipitation process was used for the synthesis of lanthanum-substituted cobalt ferrite nanoparticles at several annealing temperatures (Ta), i.e., 200 °C, 300 °C, and 400 °C, for 5 h. XRD spectral depicted that the produced nanoparticles sample indicates a single phase of fcc inverse spinel conforming to ICDD No 22-1086. The crystallite size (D) calculation at the strongest peaks shows the increase in enhancing the Ta i.e., 18.99 nm, 19.90 nm, and 23.21 nm for 200 °C, 300 °C, and 400 °C, respectively. The FTIR results showed absorption band at the tetrahedral site, v1 ~575 cm−1 and the octahedral site, v2 ~474 cm−1. The absorption bands indicate that the lanthanum ions have successfully replaced the Fe3+ cations in the original cobalt ferrite structure. According to the hysteresis loop, the coercive field's (HC) magnitude falls from 700 Oe down to 550 Oe as Ta increases. This result is consistent with the anisotropy constant which decreased from 0.77×104 erg/cm3 to 0.56×104 erg/cm3. The obtained nanoparticles also showed superior performance (much larger than 95%) for dye removal of Congo red. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

show abstract

Section: Equations For Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lanthanum-substituted Cobalt Ferrite Established by the Co-precipitation Process: Annealing Temperature Adjustment of Structural, Magnetic, and Dye Removal Characteristics

Rahmawati,

Musadewi,

Prasetya

et al. 2023

Bull. Chem. React. Eng. Catal.

View full text Add to dashboard Cite

show abstract

“…The magnetic properties of polycrystalline ferrites can vary depending on the synthesis technique, sintering temperature, and the extent of doping. As a result, these materials exhibit excellent magnetic properties [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of BaFe_9.95Al₂Mg_0.05O₁₉tuned through sintering temperature

Asif,

Ranjha,

Ghori

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

The sintering temperature is a key way to tune the structural and magnetic properties of M-type hexaferrites. Here the effect of sintering temperature on BaFe9.95Al2Mg0.05O19 M-type hexagonal Ba-hexaferrites was studied. X-ray diffraction analysis revealed the presence of Fe2O3 impurity phases in all samples. The results showed that as the sintering temperature increased, the saturation magnetization and remanence ratio initially increased, then decreased at higher temperatures. On the other hand, the coercivity and magnetocrystalline anisotropy field decreased first, then increased. The morphology suggested that average grain size consistently grew between 800-2800 nm with increasing temperature. The optimal magnetic properties of BaFe9.95Al2Mg0.05O19 were achieved at a sintering temperature of 1280 ℃, with saturation magnetization 49.94 emu/g, coercivity 4.99 kOe, anisotropic field 1.5kOe, and magnetic moment of 9.4097µB. The findings suggest that the magnetic properties of M-type hexagonal ferrites can be significantly enhanced by optimizing the sintering temperature, which has implications for the development of high-performance self-biased circulators, Magnetic filters, and other magnetic applications.

show abstract

“…Magnetic ceramics have attracted interest in scientific and technological research fields such as hyperthermia, magnetic recording, dye removal, magnetic resonance imaging, and catalysis in organic synthesis [1][2][3][4][5]. As a result, transition metal oxides have been the focus for more than 50 years.…”

Section: Introductionmentioning

confidence: 99%

Tuning of magnetic properties of Al-doped cobalt ferrite nanofiber prepared by electrospinning technique

et al. 2023

View full text Add to dashboard Cite

The Al-doped cobalt ferrite (CoFe2-xAlxO4) nanofiber has been prepared by employing the electrospinning technique. All the nanofibers are characterized by the XRD technique. The Rietveld refinement of XRD patterns reveals the spinel cubic structure with the Fd3 ̅m space group. The TEM micrographs confirm the formation of nanofiber with a nearly uniform diameter of ⁓137±10 nm. The magnetic properties of all the nanofibers have been investigated by measuring the M-H hysteresis loops with the help of a Vibrating sample magnetometer (VSM). The M-H loops analysis demonstrates a reduction in the saturation magnetization, and coercivity from 106.88 emu/g to 40.01 emu/g and 0.897 kOe to 0.324 kOe, respectively, with the increase in Al concentration in the nanofibers. The "Law of Approach to Saturation” technique has been employed to understand the magnetocrystalline anisotropy constant in the samples. The magnetocrystalline anisotropy constant (K1) decreases with the increase in Al3+ substitution in place of Fe3+ in the spinel cobalt ferrite nanofibers. A squeezing effect on the M-H loop near M = 0 is observed and it has been analyzed by a hysteresis loop width (∆H) vs magnetization (M) plot. The squeezing effect has been observed due to the exchange interaction phenomenon between the magnetic and non-magnetic atoms in the Al-doped cobalt ferrite nanofiber. The magnetic properties study demonstrates that Al-doped cobalt ferrite nanofiber exhibits soft magnetic nature.

show abstract

Study on structure and magnetic properties of rare earth doped cobalt ferrite: The influence mechanism of different substitution positions

Cited by 24 publications

References 45 publications

Lanthanum-substituted Cobalt Ferrite Established by the Co-precipitation Process: Annealing Temperature Adjustment of Structural, Magnetic, and Dye Removal Characteristics

Lanthanum-substituted Cobalt Ferrite Established by the Co-precipitation Process: Annealing Temperature Adjustment of Structural, Magnetic, and Dye Removal Characteristics

Structural and magnetic properties of BaFe_9.95Al₂Mg_0.05O₁₉tuned through sintering temperature

Tuning of magnetic properties of Al-doped cobalt ferrite nanofiber prepared by electrospinning technique

Contact Info

Product

Resources

About

Study on structure and magnetic properties of rare earth doped cobalt ferrite: The influence mechanism of different substitution positions

Cited by 24 publications

References 45 publications

Lanthanum-substituted Cobalt Ferrite Established by the Co-precipitation Process: Annealing Temperature Adjustment of Structural, Magnetic, and Dye Removal Characteristics

Lanthanum-substituted Cobalt Ferrite Established by the Co-precipitation Process: Annealing Temperature Adjustment of Structural, Magnetic, and Dye Removal Characteristics

Structural and magnetic properties of BaFe9.95Al2Mg0.05O19tuned through sintering temperature

Tuning of magnetic properties of Al-doped cobalt ferrite nanofiber prepared by electrospinning technique

Contact Info

Product

Resources

About

Structural and magnetic properties of BaFe_9.95Al₂Mg_0.05O₁₉tuned through sintering temperature