Cation distribution, magnetic and structural properties of CoCrxFe2-xO4: Effect of calcination temperature and chromium substitution

Nikmanesh, Hossein; Eshraghi, M.; Karimi, Shiva

doi:10.1016/j.jmmm.2018.09.102

Cited by 35 publications

(13 citation statements)

References 49 publications

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“…On the other hand, H c is proportional to H a . According to the formula H a = 2K 1 /M s , H a is proportional to the magnetic crystal anisotropy constant (K 1 ), and inversely proportional to M s [39,40]. According to the contribution of different lattice positions to K 1 , the 2b position has the greatest effect on K 1 .…”

Section: Effects Of Titanium Substitution On Magnetic Propertiesmentioning

confidence: 99%

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

Hong

et al. 2022

J Adv Ceram

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The barium ferrite BaTixFe12−xO19 (x = 0.2, 0.4, 0.6, 0.8) (BFTO-x) ceramics doped by Ti4+ were synthesized by a modified sol—gel method. The crystal structure and magnetic structure of the samples were determined by neutron diffraction, and confirm that the BFTO-x ceramics were high quality single phase with sheet microstructure. With x increasing from 0.2 to 0.8, the saturation magnetization (Ms) decreases gradually but the change trend of coercivity (Hc) is complex under the synergy of the changed grain size and the magnetic crystal anisotropy field. Relying on the high valence of Ti4+, double resonance peaks are obtained in the curves of the imaginary part of magnetic conductivity (μ″) and the resonance peaks could move toward the low frequency with the increase of x, which facilitate the samples perform an excellent wideband modulation microwave absorption property. In the x = 0.2 sample, the maximum reflection loss (RL) can reach −44.9 dB at the thickness of only 1.8 mm, and the bandwidth could reach 5.28 GHz at 2 mm when RL is less than −10 dB. All the BFTO-x ceramics show excellent frequency modulation ability varying from 18 (x = 0.8) to 4 GHz (x = 0.4), which covers 81% of the investigated frequency in microwave absorption field. This work not only implements the tunable of electromagnetic parameters but also broadens the application of high-performance microwave absorption devices.

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Section: Effects Of Titanium Substitution On Magnetic Propertiesmentioning

confidence: 99%

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

Hong

et al. 2022

J Adv Ceram

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“…As the radius of Co 2+ is 0.75 Å, larger than that of Fe 3+ (0.67 Å), the calculated results by the theoretical estimation equation of lattice constant [26] suggest that if the Co 2+ migrates from B sites to A sites, the lattice constant will increase. The slight shift towards small angle of the diffraction peak of annealed MNPs, as displayed in the inset of Fig.…”

Section: Discussionmentioning

confidence: 88%

Influence of annealing on magnetic induction heating efficiency of Zn–Co–Cr ferrite nanoparticles

Yang

et al. 2020

Appl. Phys. A

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The Curie temperature and heating efficiency of magnetic nanoparticles (MNPs) are two important parameters for the application in self-regulating temperature magnetic induction hyperthermia. Here we studied the effect of annealing on the Curie temperature and heating efficiency of the Zn 0.54 Co 0.45 Cr 0.6 Fe 1.4 O 4 nanoparticles prepared by hydrothermal method. The results suggest that the annealing reduces the Curie temperature of the MNPs from 61 to 51.5 °C. The heating efficiency of the MNPs has been more than doubled after annealing, i.e., from 4.4 to 9.3 W/g. The decrease of Curie temperature and increase of heating efficiency are beneficial for the application of MNPs in self-regulating temperature magnetic induction hyperthermia.

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“…22 In the pattern of NF, several Bragg diffraction peaks are observed at 18.36°, 30.21°, 35.58°, 37.22°, 43.25°, 53.66°, 57.21°, 62.82°, and 74.33°, corresponding to the (1 1 1), (2 2 0), (3 1 1), (2 2 2), (4 0 0), (4 2 2), (5 1 1), (4 4 0), and (5 3 3) crystal planes of Ni 0.6 Fe 2.4 O 4 (PDF#01-087-2338), respectively. 23 When NF is grown on HCS via the hydrothermal method, the Bragg diffraction intensity of nanoscale NF in NF@HCS composites is lower than the microscale NF to some extent, with the disappearance of weak peaks such as (1 1 1) and (2 2 2), as a result of unbalanced growth on the carbon surface.…”

Section: Phase and Microstructuresmentioning

confidence: 98%

High electromagnetic wave absorption and flame retardancy performance from NF@HCS/NF-filled epoxy-based electronic packaging material

Xiong,

Luo,

Qian

et al. 2024

J. Mater. Chem. A

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Cation distribution, magnetic and structural properties of CoCrxFe2-xO4: Effect of calcination temperature and chromium substitution

Cited by 35 publications

References 49 publications

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

Influence of annealing on magnetic induction heating efficiency of Zn–Co–Cr ferrite nanoparticles

High electromagnetic wave absorption and flame retardancy performance from NF@HCS/NF-filled epoxy-based electronic packaging material

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