Correlation between lattice strain and magnetic behavior in non-magnetic Ca substituted nano-crystalline cobalt ferrite

Kumar, Ramesh; Kar, Manoranjan

doi:10.1016/j.ceramint.2016.01.007

Cited by 70 publications

(21 citation statements)

References 29 publications

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“…Room temperature Raman spectra of all the ferrite samples are depicted in Figure . The essential condition for a material to be Raman active is the change in polarizability with respect to nuclear displacement should be nonzero, that is,

(\frac{normald α}{normald q}) \neq 0

. According to factor group analysis, this predicts 39 normal phonon modes for single phase cobalt ferrite with five Raman active modes (A 1g + E g + 3T 2g ).…”

Section: Resultsmentioning

confidence: 99%

“…The refinement parameters indicate the agreement between theoretical and observed data of XRD patterns. [11][12][13] The small crystallite size and microstrain developed inside the nanocrystallites (varying from one part of grain to another part) are mainly responsible for XRD peaks broadening. Additionally, instrumental broadening effect also contributes to peak broadening.…”

Section: X-ray Diffraction and Structural Studiesmentioning

confidence: 99%

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Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Ghosh

Mukherjee

2019

J Am Ceram Soc

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We have investigated the structural and magnetic properties of polycrystalline Cu‐substituted cobalt ferrite (CuxCo1−xFe2O4: x = 0.00, 0.15, 0.30, 0.45, 0.60) nanoparticles, synthesized via chemical coprecipitation method. The prepared samples were of single phase as confirmed by X‐ray diffraction analysis. The mean crystallite size ranged from 44 to 65 nm was obtained using Scherrer's formula. M‐T curves revealed that the Curie temperature of all the samples was above room temperature and it was found to decrease with increasing Cu concentration, which was supported by Mössbauer spectra. Field cooled (FC) hysteresis curves showed ferrimagnetic nature at 5 K and room temperature. It was observed that careful variation of Cu concentration in cobalt ferrite lead to weak A‐B interaction with tunable magnetic properties.

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(\frac{normald α}{normald q}) \neq 0

. According to factor group analysis, this predicts 39 normal phonon modes for single phase cobalt ferrite with five Raman active modes (A 1g + E g + 3T 2g ).…”

Section: Resultsmentioning

confidence: 99%

Section: X-ray Diffraction and Structural Studiesmentioning

confidence: 99%

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Ghosh

Mukherjee

2019

J Am Ceram Soc

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“…In regard to the numerous applications of CFO, in rapidly mounting scientific and industrial categories, extensive research is being carried out to tune and improve the structural, dielectric and magnetic properties of the aforementioned material . Research is being done on rare earth (RE) substituted ferrites nowadays in order to enhance the electrical, dielectric, magnetic, and magnetoelectric properties . Theoretical as well as experimental findings indicated the exchange interactions between the spinel ferrites and rare earth (RE) transition metal (4f–3d) elements has been a flourishing research activity in recent decades .…”

Section: Introductionmentioning

confidence: 99%

“…Research is being done on rare earth (RE) substituted ferrites nowadays in order to enhance the electrical, dielectric, magnetic, and magnetoelectric properties . Theoretical as well as experimental findings indicated the exchange interactions between the spinel ferrites and rare earth (RE) transition metal (4f–3d) elements has been a flourishing research activity in recent decades . This is due to the larger ionic radii, the presence of unpaired 4f electrons and magnetocrystalline anisotropy that is instigated by 4f–3d coupling due to exchange interaction .…”

Section: Introductionmentioning

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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“…CoFe 2 O 4 is a hard ferrimagnetic material having spinel structure and have a cubic phase of crystal symmetry. It has very good electric and magnetic properties , which are very useful for technological applications . The parameters such as filler size, method of preparation, type of solvent, annealing condition, and the dispersion of nanoparticles into the polymer matrix affect the crystallization behavior and morphology of the resulting composite .…”

Section: Introductionmentioning

confidence: 99%

Optimization of dielectric properties of PVDF–CFO nanocomposites

2018

Self Cite

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Incorporation of different types of nanofillers in the PVDF poly(vinylidene difluoride) matrix exhibits promising dielectric, magnetic, piezo, pyro, and ferroelectric properties for various applications. Hence a novel nanocomposite has been developed by using PVDF and cobalt ferrite (CFO) (CoFe 2 O 4 ) with different particle size of CFO for dielectric applications. The nanocomposite has been characterized by the X-ray diffraction pattern, atomic force microscopy, transmission electron microscopy, fourier transform infrared spectroscopy, field emission-scanning electron microscopy), and dielectric measurements. The space charge effect at the PVDF and CFO interfaces offers the interfacial polarization in nanocomposite, which contribute to tune the dielectric response of nanocomposite along with low dielectric loss. The filler size has been optimized to have better formation of polar β phase in PVDF along with high dielectric properties. The dielectric constant in nanocomposite has increased three times compare to that of PVDF. The 20 ± 1 nm size (CFO) filler in PVDF matrix exhibits optimized dielectric properties.

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Correlation between lattice strain and magnetic behavior in non-magnetic Ca substituted nano-crystalline cobalt ferrite

Cited by 70 publications

References 29 publications

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

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

Optimization of dielectric properties of PVDF–CFO nanocomposites

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Correlation between lattice strain and magnetic behavior in non-magnetic Ca substituted nano-crystalline cobalt ferrite

Cited by 70 publications

References 29 publications

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

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

Optimization of dielectric properties of PVDF–CFO nanocomposites

Contact Info

Product

Resources

About

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