Structural, electrical and magnetic properties of Zr–Mg cobalt ferrite

Iqbal, Muhammad Javed; Siddiquah, Mah Rukh

doi:10.1016/j.jmmm.2007.09.009

Cited by 60 publications

(11 citation statements)

References 28 publications

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“…The activation energy ( E a ) was determined [ 49 ] using the following equation from the temperature dependence of resistivity ( ρ ):

where ρ 0 is the pre-exponential factor, the E a increases from 0.27 eV to 0.53 eV as the Mg content increases, as illustrated in Table 8 . E a behaves similarly to resistivity.…”

Section: Resultsmentioning

confidence: 99%

Structure, Morphology and Electrical/Magnetic Properties of Ni-Mg Nano-Ferrites from a New Perspective

et al. 2022

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Using the auto combustion flash method, Ni1−x+2Mgx+2Fe2+3O4 (x = 0, 0.2, 0.6, 0.8 and 1) nano-ferrites were synthesized. All samples were thermally treated at 973 K for 3 h. The structural analysis for the synthesized samples was performed using XRD, high-resolution transmission electron microscopy (HRTEM), and FTIR. Scanning electron microscopy (SEM) was undertaken to explore the surface morphology of all the samples. The thermal stability of these samples was investigated using thermogravimetric analysis (TGA). XRD data show the presence of a single spinel phase for all the prepared samples. The intensity of the principal peak of the spinel phase decreases as Mg content increases, showing that Mg delays crystallinity. The Mg content raised the average grain size (D) from 0.084 μm to 0.1365 μm. TGA shows two stages of weight loss variation. The vibrating sample magnetometer (VSM) measurement shows that magnetic parameters, such as initial permeability (μi) and saturation magnetization (Ms), decay with rising Mg content. The permeability and magnetic anisotropy at different frequencies and temperatures were studied to show the samples’ magnetic behavior and determine the Curie temperature (TC), which depends on the internal structure. The electrical resistivity behavior shows the semi-conductivity trend of the samples. Finally, the dielectric constant increases sharply at high temperatures, explained by the increased mobility of charge carriers, and decreases with increasing frequency.

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“…The activation energy ( E a ) was determined [ 49 ] using the following equation from the temperature dependence of resistivity ( ρ ):

where ρ 0 is the pre-exponential factor, the E a increases from 0.27 eV to 0.53 eV as the Mg content increases, as illustrated in Table 8 . E a behaves similarly to resistivity.…”

Section: Resultsmentioning

confidence: 99%

Structure, Morphology and Electrical/Magnetic Properties of Ni-Mg Nano-Ferrites from a New Perspective

et al. 2022

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“…where hkl are the Miller indices of the diffraction peak and d is the interplanar spacing. The porosity (P) of the samples was determined using the formula [14] where d m and d x are the measured density and theoretical density, respectively. The measured density was calculated using the relation…”

Section: Characterizationmentioning

confidence: 99%

Structural and dielectric properties of Cr-doped Ni–Zn nanoferrites

Nasir¹,

Anis-ur-Rehman²,

Malik³

2011

Phys. Scr.

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Cr-doped Ni-Zn ferrite nanoparticles having the general formula Ni 0.5 Zn 0.5 Cr x Fe 2−x O 4 (x = 0.1, 0.3, 0.5) were prepared by the simplified sol-gel method. The structural and dielectric properties of the samples sintered at 750 ± 5 • C were studied. X-ray diffraction (XRD) patterns confirm the single-phase spinel structure of the prepared samples. The crystallite size calculated from the most intense peak (3 1 1) using the Debye-Scherrer formula was 29-34 nm. Scanning electron microscope images showed that the particle size of the samples lies in the nanometer regime. The dielectric constant (ε r ), dielectric loss tangent (tan δ) and ac electrical conductivity (σ ac ) of nanocrystalline Cr-Ni-Zn ferrites were investigated as a function of frequency and Cr concentration. The dependence of ε r , tan δ and σ ac on the frequency of alternating applied electric field is in accordance with the Maxwell-Wagner model. The effect of Cr doping on the dielectric and electric properties was explained on the basis of cations distribution in the crystal structure.

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“…The carrier mobility in ferrites formed at high temperature are comparatively low. This is due to composition with variation of carrier mobility behavior was reported in number of mixed ferrite systems Ni-Zn Cerium and Zr-Mg Cobalt ferrite [31], and increase in crystallinity and also stoichiometry of the ferrites.…”

Section: Charge Carrier Mobility (μ)mentioning

confidence: 66%

High- Temperature Electrical Properties of Cerium Doped Ni-Zn Nano Ferrites

Nama¹,

Tigulla²,

Ravinder³

et al. 2021

Preprint

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Rare Earth Ce3+ Substituted Nickel-Zinc Nano Ferrite were synthesized Calculated Chemical Formulation Ni0.2Zn0.8CexFe2-xO4 (0.000 ≤ x ≤ 0.040) by Citrate-Gel Auto Combustion method at lower temperature. The Single-Phase Cubic Spinel Structure was confirmed by the Characteristic of X-ray diffraction analysis (XRD). The SEM Micrographs confess from typical grain size and surface pattering of the samples is nanometric range confirming the nano crystalline nature. Energy Dispersive Spectrometer (EDS) were used to conduct elemental analysis and elemental parentage. Thermo electric power (TEP) of the prepared samples has been obtained using differential method with high temperature studies carried out in cooling cycle. The electric conductivity at high temperatures using two probe methods. The activation energy in the paramagnetic region (EP) is found greater than the ferrimagnetic region (EF). The carrier concentration(n), charge Carrier Mobility (μ) was carried out by TEP and electric conductivity Studies.

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Structural, electrical and magnetic properties of Zr–Mg cobalt ferrite

Cited by 60 publications

References 28 publications

Structure, Morphology and Electrical/Magnetic Properties of Ni-Mg Nano-Ferrites from a New Perspective

Structure, Morphology and Electrical/Magnetic Properties of Ni-Mg Nano-Ferrites from a New Perspective

Structural and dielectric properties of Cr-doped Ni–Zn nanoferrites

High- Temperature Electrical Properties of Cerium Doped Ni-Zn Nano Ferrites

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