Microstructure, lattice strain, magnetic and magnetostriction properties of holmium substituted cobalt ferrites obtained by co-precipitation method

Ghone, Deepali M.; Mathe, V. L.; Patankar, Ketaki K.; Kaushik, S. D.

doi:10.1016/j.jallcom.2017.12.219

Cited by 61 publications

(6 citation statements)

References 38 publications

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“…Samples of zinc ferrites co-doped Gd 3+ and Sm 3+ therefore require more energy to boost crystal growth. It should be noted that a typically similar behavior with respect to the different rare earth dopants has been reported in the literature [26], [27].…”

Section: 1thermal Analysissupporting

confidence: 77%

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

Belaiche

Minaoui

Ouadou

et al. 2020

Preprint

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Highly crystalline ZnFe1.98Sm0.01Gd0.01O4 nanoferrites were prepared by co-precipitation method for the first time. The nanoparticles were characterized using thermogravimetric and differential scanning calorimetry analysis (TGA and DSC), which shows the thermal behavior of the reagents mixture. XRD analysis confirms the formation of nanocrystalline ferrite phase with Fd3m space group, and the particle size was observed to be 11 nm . The FTIR reveals two based bands of absorption characterize the formation of the spinel structure. An exhaustive study of the magnetic properties, morphology, crystallinity and effects of co-doping Gd3 + and Sm3 + was presented in detail. The average crystallites size was observed to decrease for Gd3+ and Sm3+ co-doping. Magnetic measurements reveal weak ferrimagnetic behavior at low temperature and superparamagnetic at high temperature with a blocking temperature at 55 K.

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Section: 1thermal Analysissupporting

confidence: 77%

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

Belaiche

Minaoui

Ouadou

et al. 2020

Preprint

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“…Figure 4 illustrates the FTIR spectra of pristine CFO ferrite and zinc substituted CFO NPs samples. First of all, the spinel ferrite structure of all samples was affirmed by the presence of two fundamental transmittance bands at ν 1 = 557.37 cm −1 and ν 2 = 394.00 cm −1 whereas these bands could be related to the stretching of the oxygen bonds at the tetrahedral sites and metal-oxygen bond stretching at the octahedral sites, respectively as obtained in Table 4 [63,66].…”

Section: Structure Investigationsmentioning

confidence: 61%

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Maksoud

Elghandour

El-Sayyad

et al. 2020

J Inorg Organomet Polym

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This work reports the detailed structural characterization of Zn 2+ ion-substituted cobalt ferrite nanoparticles (CFO NPs; Co 1−x Zn x Fe 2 O 4 ; x = 0.00, 0.25, 0.50, and 0.75), prepared using a facile sol-gel method. It correlates structural changes with magnetic and dielectric properties. The as-synthesized samples were investigated by X-ray diffraction (XRD) analysis, BET surface area analyzer, energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), Mössbauer spectroscopy, and impedance analyzer. The pristine sample (CFO) comprised of NPs with 25 nm size, which decreased up to 11 nm upon the formation of Zn 0.75 Co 0.25 Fe 2 O 4 . The N 2 adsorption-desorption isotherm of the prepared Zn 0.5 Co 0.5 Fe 2 O 4 sample confirmed the presence of a mesoporous structure. SEM images revealed that all prepared samples exhibited porous surface with honeycomb-like structures. The cationic distribution was described by Mössbauer spectra. The increment of Zn ions in the prepared samples resulted in sharp reduction of saturation magnetization and remanence values. The normal dielectric dispersion behavior was recorded and can be ascribed to the Maxwell-Wagner type polarization. Besides, the dielectric parameters varied by increasing Zn content in CFO NPs. This may be ascribed to O 2 vacancies and Fe 3+ ions in A-and B-sites. Dielectric studies revealed that, content of Zn ions beyond x = 0.25 was sufficient to reduce both dielectric constant and loss at low frequencies.

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“…Hence extra energy that is needed hinders the crystallization process and growth of grains in Ho 3+ substituted CFO samples. Moreover, the additional HoFeO3 phase existing as the orthoferrite phase at grain boundaries behave as pinning sites at the grain boundary hindering the grain growth ensuing the formation of smaller grains …”

Section: Resultsmentioning

confidence: 99%

DC Electrical Resistivity, Dielectric, and Magnetic Studies of Rare‐Earth (Ho³⁺) Substituted Nano‐Sized CoFe₂O₄

Routray

Saha

Behera

2019

Physica Status Solidi (b)

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The effect of Fe substitution by rare‐earth (Holmium; Ho3+) ions in CoFe2O4 (CFO) prepared by glycine nitrate process is investigated from electrical, dielectric, magnetic, and Mössbauer perspectives. The anticipated spinel cubic phase structure is confirmed by X‐ray diffractometry and Fourier transform infrared (FTIR) analysis which support the presence of a secondary phase of HoFe2O3 at higher Ho content. Field emission scanning electron microscope (FESEM) and transmission electron microscopic (TEM) micrographs confirmed that the incorporation of Ho3+ significantly reduced the grain size of the samples from 50 nm to 20 nm. The complex impedance and modulus spectroscopy are investigated as a function of frequency in the regime of 102–106Hz in the temperature range of 30–300 °C. The conduction mechanism is attributed to the hopping of both electrons and holes. Activation energies (Ea) obtained from the Arrhenius plots of the grain and the grain boundary conductions are ascribed to the hopping of charge carriers. Electrical modulus results specify the existence of the non‐Debye type of dielectric relaxation. A massive reduction in loss factor is successfully achieved. Room temperature magnetization measurements indicate a reduction in saturation magnetization and coercivity (hysteresis losses) with increasing Ho3+ content, which entails these materials to be used for magnetic data storage and magneto recording devices.

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Microstructure, lattice strain, magnetic and magnetostriction properties of holmium substituted cobalt ferrites obtained by co-precipitation method

Cited by 61 publications

References 38 publications

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

DC Electrical Resistivity, Dielectric, and Magnetic Studies of Rare‐Earth (Ho³⁺) Substituted Nano‐Sized CoFe₂O₄

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Microstructure, lattice strain, magnetic and magnetostriction properties of holmium substituted cobalt ferrites obtained by co-precipitation method

Cited by 61 publications

References 38 publications

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

DC Electrical Resistivity, Dielectric, and Magnetic Studies of Rare‐Earth (Ho3+) Substituted Nano‐Sized CoFe2O4

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DC Electrical Resistivity, Dielectric, and Magnetic Studies of Rare‐Earth (Ho³⁺) Substituted Nano‐Sized CoFe₂O₄