X-ray diffraction and dielectric study of Co1−xCdxFe2−xCrxO4 ferrite system

Shitre, A. R.; Kawade, V. B.; Bichile, G. K.; Jadhav, K. M.

doi:10.1016/s0167-577x(02)00438-x

Cited by 48 publications

(16 citation statements)

References 15 publications

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“…In the present study, tan δ for sample A (8 nm) is about 0⋅0325 at 300 K in the same frequency range. The dielectric loss is thus found to be an order of magnitude lower for the 8 nm particles compared to that of the bulk cobalt ferrite (Shitre et al 2002). The sample A (8 nm) can, therefore, be used for high frequency communication because of the low value of dielectric loss.…”

Section: 2bmentioning

confidence: 92%

“…The plots between dielectric loss (tan δ) and frequency for samples A and B are shown in figure 11(b). Shitre et al (2002) observed that tan δ is around 0⋅4 at 300 K in the frequency range of 1 kHz for the bulk cobalt ferrite prepared by ceramic method. In the present study, tan δ for sample A (8 nm) is about 0⋅0325 at 300 K in the same frequency range.…”

Section: 2bmentioning

confidence: 94%

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Influence of mechanical milling and thermal annealing on electrical and magnetic properties of nanostructured Ni-Zn and cobalt ferrites

Narayanasamy

Sivakumar

2008

Bull Mater Sci

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The present article reports some of the interesting and important electrical and magnetic properties of nanostructured spinel ferrites such as Ni 0⋅5 Zn 0⋅5 Fe 2 O 4 and CoFe 2 O 4 . In the case of Ni 0⋅5 Zn 0⋅5 Fe 2 O 4 , d.c. electrical conductivity increases upon milling, and it is attributed to oxygen vacancies created by high energy mechanical milling. The real part of dielectric constant (ε′) for the milled sample is found to be about an order of magnitude smaller than that of the bulk nickel zinc ferrite. The increase in Néel temperature from 538 K in the bulk state to 611 K on the reduction of grain size upon milling has been explained based on the change in the cation distribution. The dielectric constant is smaller by an order of magnitude and the dielectric loss is three orders of magnitude smaller for the milled sample compared to that of the bulk. In the case of cobalt ferrite, the observed decrease in conductivity, when the grain size is increased from 8-92 nm upon thermal annealing is clearly due to the predominant effect of migration of some of the Fe 3+ ions from octahedral to tetrahedral sites, as is evident from in-field Mössbauer and EXAFS measurements. The dielectric loss (tan δ) is an order of magnitude smaller for the nano sized particles compared to that of the bulk counterpart.

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Section: 2bmentioning

confidence: 92%

Section: 2bmentioning

confidence: 94%

Influence of mechanical milling and thermal annealing on electrical and magnetic properties of nanostructured Ni-Zn and cobalt ferrites

Narayanasamy

Sivakumar

2008

Bull Mater Sci

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“…The increase in the complex permittivity with the treatment temperature is due to the structural and morphologic changes observed. This behaviour occurs for other ferrites [23,24], where an increase in ε′ with the temperature of the heat treatment is observed. The crystallite size of the particles (Figure 3) influences the dielectric response, that is, the increase in the crystallite size, which is maximum for the samples treated at 1050, 1100, 1150 and 1200°C, leads to an increase in the dielectric constant.…”

Section: Electrical and Dielectric Measurementsmentioning

confidence: 61%

Lithium Ferrite: Synthesis, Structural Characterization and Electromagnetic Properties

Teixeira¹,

Graça²,

Valente³

et al. 2017

Magnetic Spinels - Synthesis, Properties and Applications

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Lithium ferrite (LiFe 5 O 8 ) is a cubic ferrite, belongs to the group of soft ferrite materials with a square hysteresis loop, with high Curie temperature and magnetization. The spinel structure of LiFe 5 O 8 has two crystalline forms: ordered, β-LiFe 5 O 8 (Fd3m space group) and disordered, α-LiFe 5 O 8 (P4 1 32/P4 3 32 space group). It has numerous technological applications in microwave devices, computer memory chip, magnetic recording, radio frequency coil fabrication, transformer cores, rod antennas, magnetic liquids among others. It is also a promising candidate for cathode in rechargeable lithium batteries. In this work, the dc electrical conductivity, the impedance spectroscopy and the magnetization of Li 2 O-Fe 2 O 3 powders, with [Li]/[Fe]=1/5 (mol), heat-treated at several temperatures, are studied and related to their structure and morphology. The structural data were obtained by X-ray diffraction and Raman spectroscopy, and the morphology by scanning electron microscopy. The impedance spectroscopy was analysed in function of temperature and frequency, and it was observed that the dielectric properties are highly dependent on the microstructure of the samples. The dc magnetic susceptibility was recorded with a vibrating sample magnetometer, under zero field cooled and field cooled sequences, between 5-300 K. Typical hysteresis curves were obtained and the saturation magnetization increases with increase in heat-treatment temperature.

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“…It may be attributed to the interfacial polarizations predicted by Maxwell-Wagner model [10][11][12]. So the decrease in dielectric constant is due to inability of the electron exchanges between the two localized states (Fe +2 and Fe +3 ) to follow the external applied field beyond a certain frequency [13] and non respond of the dipoles due to space charge polarization at higher frequencies. At lower frequencies, the grain boundaries are more effective or contribution from the space charge polarization is high.…”

Section: Micro Structural Properties:-mentioning

confidence: 99%

Effect of Cobalt Ferrite on Electrical and Magnetic Properties of Bismuth Ferrite.

Hemanta¹,

Sharma²

2017

IJAR

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X-ray diffraction and dielectric study of Co1−xCdxFe2−xCrxO4 ferrite system

Cited by 48 publications

References 15 publications

Influence of mechanical milling and thermal annealing on electrical and magnetic properties of nanostructured Ni-Zn and cobalt ferrites

Influence of mechanical milling and thermal annealing on electrical and magnetic properties of nanostructured Ni-Zn and cobalt ferrites

Lithium Ferrite: Synthesis, Structural Characterization and Electromagnetic Properties

Effect of Cobalt Ferrite on Electrical and Magnetic Properties of Bismuth Ferrite.

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