Microscopic and Macroscopic Magnetic Properties of the MgAlxCrxFe2 - 2xO4Spinel Ferrite System

Thummer, K. P.; Pandya, M. P.; Jani, Kalpesh H.; Modi, K. B.; Joshi, H. H.

doi:10.1023/b:masc.0000042792.25335.14

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…One bond was in the high-frequency range (ν 1 ) due to the frequencies of the Fe-O bonds of the tetrahedral (A site) between 557 and 586 cm -1 . The other bond was in the low-frequency range (ν 2 ), which is attributed to the frequencies of the M-O bonds of the octahedral (B-site) between 418 and 430) cm -1 [22][23][24][25].…”

Section: Xrd and Ftir Analysesmentioning

confidence: 99%

Characterization of Calcinated Ni–Cu Ferrite Nanoparticles Synthesized by Citrate-gel Auto combustion Technique

Waheed

Sabri

Dahham

et al. 2021

eijs

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Citrate-gel auto combustion technique was used to synthesize nickel-copper mixed ferrite nanoparticles NixCu1-xFe2O4 (x= 0.0, 0.4, 1.0) with different calcinating temperatures (200, 450, 650 and 850 °C). Structural, morphological, magnetic, and electrical properties were studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), and LCR meter in order to determine significant influences of Cu2+ cations content in nickel ferrite. The XRD patterns showed that all compositions had cubic spinels, except CuFe2O4 samples. The system structure in Cu-ferrite was deformed at 650 °C from a cubic to a tetragonal system with a secondary phase CuO. Lattice constant was decreased with increasing Cu2+ cations substitution in Ni-ferrites, while crystalline volume was increased. With the help of Debye-Scherrer`s equation using XRD data, we found that the crystallite size at 850 °C is lying in the range from 38.70  to 48.00 nm. The FTIR spectrum of samples under investigation showed two significant absorption bands, which refer to the formation of a single-phase cubic spinel. The magnetization test revealed a soft ferromagnetic behavior for all the compositions sintered at 850 °C. The saturation magnetization (Ms) was decreased with the substitution by Cu2+ cations, while remnant magnetization (Mr) and coercivity (Hc) were increased in Cu-ferrite. The highest Ms value was 42.25 emu.g-1 for Ni-ferrite, while the highest Hc value was 517.16 Oe for Cu-ferrite. The electrical measurement of samples showed an increase in the real dielectric constant and AC conductivity at a frequency range of 20Hz-3MHz with the addition of copper cations.

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Section: Xrd and Ftir Analysesmentioning

confidence: 99%

Characterization of Calcinated Ni–Cu Ferrite Nanoparticles Synthesized by Citrate-gel Auto combustion Technique

Waheed

Sabri

Dahham

et al. 2021

eijs

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“…Electrical properties of cobalt-chromium substituted magnesium ferrite were also investigated and found that room temperature resistivity increased as the contents of cobalt-chromium increased in Mg 1−x Co x Cr x Fe 2−x O 4 ferrites [31]. Thummer et al [32] have synthesized aluminum and chromium substituted magnesium ferrite MgAl x Cr x Fe (2−2x) O 4 by double sintering method and investigated the magnetic properties. They found that initially, saturation magnetization increased as the content of aluminium-chromium is increased from 0.0 to 0.2 and then decreased as the Al-Cr concentration further increased.…”

Section: Effect Of Substitution On Magnesium Ferritementioning

confidence: 99%

“…The canted spin structure was stabled at lower temperatures and disappeared when approached to the Neel-type collinear spin ordering at all temperatures. The canting angles were related to the magnetic dilution by using the noncollinear spin models based on the molecular field theory [32]. Tanna et al [33] synthesized zinc substituted magnesium ferrite (Mg 1−x Zn x Fe 2 O 4 (0 ≤ x ≤ 1.0, step size 0.1) and aluminum substituted magnesium-zinc ferrites (Mg 0.6 Zn 0.4 Al x Fe 2−x O 4 (0 ≤ x ≤ 0.6, step size 0.1) by double sintering solid-state reaction and found interesting behavior.…”

Section: Effect Of Substitution On Magnesium Ferritementioning

confidence: 99%

Effect of Substitution on the Electric and Magnetic Properties of Ferrites

Desai

Tanna

2021

Engineering Materials

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This chapter summarizes the effect of monovalent, divalent, trivalent, and tetravalent elements substitution on the electric and magnetic properties of spinel ferrites. Due to the doping of different cations, drastic changes take place in the properties of spinel structure. The spinel structure of the ferrite possesses insulating properties at room temperature and magnetic due to the presence of iron in the material. As well as the preparation method plays a crucial role to vary the physical properties of ferrite, in the result, possibility to use these spinel ferrite materials in a variety of applications. By changing the synthesis route of the magnetic ferrite specimens, can be utilized as superparamagnetic materials for specific biomedical applications. The temperature can affect the electrical properties as more than one valence state of the ions in the interstitial sites of ferrite by hopping mechanism. The various dopants modify the exchange interaction, spin canting, cation distribution, Curie temperature, saturation magnetization, nuclear hyperfine field, ac resistivity, dc resistivity, and many other properties of spinel ferrite materials.

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Structural and Magnetic Properties of (Mg_0.8Fe²⁺_0.2)(Al_0.4Cr_xFe³⁺_1.6−x)O₄ Spinel Solid Solution Obtained by Molten Salt Synthesis

Pan

Shen

et al. 2021

Physica Status Solidi (a)

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(Mg0.8Fe2+0.2)(Al0.4CrxFe3+1.6−x)O4 (x = 0.0, 0.4, 0.8, 1.2, and 1.6) spinel particles are prepared by molten salt method at 1050 °C for 5 h. The solid solution structure is determined by X‐ray diffraction (XRD) as cubic spinel with Fd‐3m space group. The lattice parameter and crystalline size decrease with increasing Cr content. Cr3+ ions occupy the octahedral sites, as shown by combined Fourier transform infrared spectroscopy (FTIR) and XRD analysis. The magnetization as a function of field (±4.52 T) and field‐cooled (FC) and zero‐field‐cooled (ZFC) magnetization measurements under a field of 100 Oe is measured for temperatures ranging from 1.5 to 300 K. It is found from M(T) curves that the interparticle interactions are suppressed below 28.1–40.8 K, and the curves also shows the ferromagnetic from M(H) hysteresis for the samples with x = 0.0, 0.4, and 0.8. However, for x = 1.2 and 1.6, the samples show superparamagnetic, as also supported by the obtained electron paramagnetic resonance (EPR) and Mössbauer spectra.

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Microscopic and Macroscopic Magnetic Properties of the MgAl_xCr_xFe_{2 - 2x}O₄Spinel Ferrite System

Cited by 7 publications

References 7 publications

Characterization of Calcinated Ni–Cu Ferrite Nanoparticles Synthesized by Citrate-gel Auto combustion Technique

Characterization of Calcinated Ni–Cu Ferrite Nanoparticles Synthesized by Citrate-gel Auto combustion Technique

Effect of Substitution on the Electric and Magnetic Properties of Ferrites

Structural and Magnetic Properties of (Mg_0.8Fe²⁺_0.2)(Al_0.4Cr_xFe³⁺_1.6−x)O₄ Spinel Solid Solution Obtained by Molten Salt Synthesis

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Microscopic and Macroscopic Magnetic Properties of the MgAlxCrxFe2 - 2xO4Spinel Ferrite System

Cited by 7 publications

References 7 publications

Characterization of Calcinated Ni–Cu Ferrite Nanoparticles Synthesized by Citrate-gel Auto combustion Technique

Characterization of Calcinated Ni–Cu Ferrite Nanoparticles Synthesized by Citrate-gel Auto combustion Technique

Effect of Substitution on the Electric and Magnetic Properties of Ferrites

Structural and Magnetic Properties of (Mg0.8Fe2+0.2)(Al0.4CrxFe3+1.6−x)O4 Spinel Solid Solution Obtained by Molten Salt Synthesis

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Microscopic and Macroscopic Magnetic Properties of the MgAl_xCr_xFe_{2 - 2x}O₄Spinel Ferrite System

Structural and Magnetic Properties of (Mg_0.8Fe²⁺_0.2)(Al_0.4Cr_xFe³⁺_1.6−x)O₄ Spinel Solid Solution Obtained by Molten Salt Synthesis