Study of cation distribution in La3+ and Eu3+ substituted cobalt ferrite and its effect on magnetic properties

Channagoudra, Ganesha; Nunez, John Peter J.; Hadimani, Ravi L.; Dayal, Vijaylakshmi

doi:10.1016/j.jmmm.2022.169550

Cited by 21 publications

(10 citation statements)

References 51 publications

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“…Table 5 also shows that the M R /M S magnitudes were 0.56, 0.65, 0.62, and 0.52 for CoFe 2 O 4 , CoBi 0.1 Fe 1.9 O 4 , CoLa 0.1 Fe 1.9 O 4 , and CoAl 0.1 Fe 1.9 O 4 nanoparticles, respectively. The obtained results confirm that all nanoparticles magnetic have a single-domain structure which contribute to the high coercive field [53,77,78].…”

Section: ¯( )supporting

confidence: 74%

“…Meanwhile, CoLa 0.1 Fe 1.9 O 4 has a value of 8.3819 Å which is slightly lower than the CoFe 2 O 4 . A similar decrease in lattice constant and shrinkage in unit cell volume was observed in the previously studied RE 3+ doped cobalt ferrite[53,56]. Kumar and Kar[56] reported a decrease in the lattice constant from 8.360 to 8.358Å, and Channagoudra et al[53] reported this decrease from 8.384 to 8.383Å in the La 3+ substitution.…”

supporting

confidence: 77%

“…A similar decrease in lattice constant and shrinkage in unit cell volume was observed in the previously studied RE 3+ doped cobalt ferrite[53,56]. Kumar and Kar[56] reported a decrease in the lattice constant from 8.360 to 8.358Å, and Channagoudra et al[53] reported this decrease from 8.384 to 8.383Å in the La 3+ substitution. Lattice constants generally increase when larger RE 3+ ions displace Fe 3+ .…”

supporting

confidence: 77%

“…XRD patterns were analyzed using the Rietveld refinement technique using Fullprof TM software indexed in cubic symmetry with the space group Fd-3m, refinement parameters are tabulated in table1. The results show that the magnitude of χ 2 (goodness of fit) is close to 1 which justifies the goodness of refinement[10,16,53,54]. The absence of an impurity peak that appears confirms that the synthesis of cobalt ferrite with trivalent ion substitution still maintains the spinel crystal structure[55].…”

supporting

confidence: 62%

“…M is the magnetization, M S (LoA) is the saturation magnetization by fitting Morrish's Law, H is the applied field, and m 0 is permeability of the free space [80]. Meanwhile, the B value can also be used to calculate the effective magnetic anisotropy (K eff ).…”

Section: ¯( )mentioning

confidence: 99%

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Cation trivalent tune of crystalline structure and magnetic properties in coprecipitated cobalt ferrite nanoparticles

Prasetya

Setiyani²,

Utari³

et al. 2023

Mater. Res. Express

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CoFe2O4, CoBi0.1Fe1.9O4, CoLa0.1Fe1.9O4, and CoAl0.1Fe1.9O4 nanoparticles were successfully synthesized by the coprecipitation method. After annealing at 700C for 5 h, the X-Ray Diffractometer results confirm that a single phase of cobalt ferrite-based nanoparticles is obtained, which is suitable for ICDD 22-1086. The addition of Bi3+, La3+ and Al3+ ions to the cobalt ferrite nanoparticles modified the crystallite size and lattice constant. Trivalent metal cation substitution tunes the crystallite size which has also been confirmed by measuring the grains with Scanning Electron Microscope images. In the Far Transform Infra-Red curve, the addition of metal ions (Bi3+, La3+, and Al3+) to cobalt ferrite nanoparticles resulted in absorption peaks at the tetrahedral and octahedral sites without any additional absorption peaks. The VSM results showed that saturation magnetization decreased drastically in the presence of trivalent non-magnetic cations, which confirms the replacement of Fe3+ by trivalent non-magnetic cations. The kOe order of the coercive field was obtained in this experiment. The largest coercive field of the cobalt ferrite nanoparticles was obtained with the addition of La3+ ions, i.e., 3.67 kOe suggest supporting both Jahn-Teller effect and strain-induced magnetism.

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Section: ¯( )supporting

confidence: 74%

supporting

confidence: 77%

supporting

confidence: 77%

supporting

confidence: 62%

Section: ¯( )mentioning

confidence: 99%

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