Electron conduction in magnetite and ferrites

Rlinger, M. I.; Samokhvalov, A. A.

doi:10.1002/pssb.2220790102

Cited by 87 publications

(28 citation statements)

References 42 publications

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“…) indicate that the data are included only for comparing the resistivity of the material, while the amount of Fe 2 + contained in the specimen is not the same as the corresponding value represented by the datum point. The behavior by which the apparent resistivity of the specimen increases as the amount of divalent iron decreases, is in agreement with the hopping model of electrical conduction in MnZn-ferrite [ 13 ]. The ferrous ions can be considered as donors containing an extra electron, which will jump to the adjacent ferric ions easily and constitute the electrical conduction.…”

Section: • -3 -supporting

confidence: 82%

“…The basic electron conduction mechanisms in ferrites have been studied by many investigators [ 10-1Z] and reviewed by Klinger et al [ 13 ]. Among the various models proposed, such as the standard band theory model, a small-polaron mechanism, and the thermally activated hopping model, the latter model has been well applied to explain qualitatively the electrical behavior of MnZn-ferrites.…”

Section: • -3 -mentioning

confidence: 99%

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Controlled atmosphere annealing of high-permeability Manganese Zinc Ferrite

1986

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Section: • -3 -supporting

confidence: 82%

Section: • -3 -mentioning

confidence: 99%

Controlled atmosphere annealing of high-permeability Manganese Zinc Ferrite

1986

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“…It can be noticed that, the activation energy for the annealed samples at 800, 1,000 and 1,200°C is 0.83, 0.86 and 0.71 eV, respectively. The values of the activation energy are due to a formation of small polaron (Kliger 1977).…”

Section: Electrical Propertiesmentioning

confidence: 99%

Structural, magnetic and electrical properties of the lithium ferrite obtained by ball milling and heat treatment

Mazen

Abu-Elsaad

2014

Appl Nanosci

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The physical properties of ferrites are very sensitive to microstructure, which in turn critically depends on the manufacturing process. Lithium ferrite is synthesized by milling process. The powder was annealed at four different temperatures 600, 800, 1,000 and 1,200°C. The powder annealed at 600°C has the spinel structure with some of a-Fe 2 O 3 , while the powders annealed at C800°C formed in single-phase cubic spinel structure. Particle size of lithium ferrite is in the range of 26-70 nm, and is dependent on the annealing temperature. The saturation magnetization increased from 22 to 85 emu/g and the coercivity decreases from 124 to 4 Oe with increase in the annealing temperature. The dielectric constant (e'), dielectric loss (tan d) and ac conductivity (r ac ) were measured at room temperature as a function of frequency. The results of dielectric properties were explained in terms of Koops phenomenological theory.

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“…The conduction at a lower temperature ( below curie temperature) is due to hopping of electrons [15] between Fe 2+ and Fe 3+ ions, where as at a higher temperature (above curie temperature ) due to hopping of polarons [16][17][18]. The calculated values of activation energy in a paramagnetic region (E 2 ) are greater than 0.40 eV which clearly suggest that the conduction is due to hopping of polarons.…”

Section: Electrical Conductivity (σ)mentioning

confidence: 99%

Electrical Properties of Cadmium Substitution in Nickel Ferrites

Ande¹,

Somaiah²,

Ravinder³

et al. 2012

WJCMP

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Electrical transport properties such as conductivity (σ) and thermo electric power (S) of Cadmium substituted Nickel Ferrites, forming chemical formula Ni 1-x Cd x Fe 2 O 4 , where x = 0.0, 0.2, 0.4 have been investigated from room temperature to well beyond the Curie temperature. Plots of log (σT) versus 10 3 /T are linear and show a transition near the Curie temperature. The transition temperature is found to decrease with increase of Cd content. On the basis of Seebeck coefficient (S), the ferrites under investigation have been classified as n-type and p-type semiconductors. The values of charge carrier concentration and mobility have been computed from experimental values of Seebeck coefficient and electrical conductivity. The activation energy in the ferrimagnetic region is in general less than that in the paramagnetic region. An attempt is made to explain the conduction mechanism in these ferrites.

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Electron conduction in magnetite and ferrites

Cited by 87 publications

References 42 publications

Controlled atmosphere annealing of high-permeability Manganese Zinc Ferrite

Controlled atmosphere annealing of high-permeability Manganese Zinc Ferrite

Structural, magnetic and electrical properties of the lithium ferrite obtained by ball milling and heat treatment

Electrical Properties of Cadmium Substitution in Nickel Ferrites

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