Electrical transport properties of manganese-magnesium mixed ferrites

Reddy, V. Devender; Malik, Md. Abdul; Reddy, P. Venugopal

doi:10.1016/0921-5107(91)90050-6

Cited by 36 publications

(9 citation statements)

References 6 publications

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“…It may be observed from the figure that the lattice parameter varies linearly with the Cd ion content. A similar linear dependence has also been observed in Ni-Zn [5], Mn-Zn [6], Li-Cd [7], Cd-Co [8] ferrites.…”

Section: Composition Dependence Of Latticesupporting

confidence: 60%

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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Section: Composition Dependence Of Latticesupporting

confidence: 60%

Electrical Properties of Cadmium Substitution in Nickel Ferrites

Ande¹,

Somaiah²,

Ravinder³

et al. 2012

WJCMP

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“…The Seebeck coefficients were measured by a differential method [1][2][3] from room temperature to well beyond the Curie temperature. The temperature gradient across the sample was measured using two pairs of copper constant thermocouples.…”

Section: Methodsmentioning

confidence: 99%

Thermoelectric power studies of Ca–Co ferrites

Ravinder

Kumar

Venudhar

2004

Journal of Alloys and Compounds

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“…5 reveals that there is a maximum of Seebeck coefficient for every composition at a temperature T s . The temperature at which the maximum is obtained in Seebeck coefficient has been designated as Seebeck coefficient transition temperature T s by Reddy et al [22] and Ravinder [23]. It may be pointed out here that T s and Curie transition temperature T c are different from each other.…”

Section: Resultsmentioning

confidence: 99%

DC conductivity and Seebeck coefficient of nonstoichiometric MgCuZn ferrites

Madhuri

Kiran

Reddy

et al. 2017

Materials Science-Poland

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Nonstoichiometric series of Mg 0.5 − x Cu x Zn 0.5 Fe 1.9 O 4 − δ where x = 0.0, 0.1, 0.15, 0.2 and 0.25 has been synthesized by conventional solid state reaction route. The single phase spinel structure of the double sintered ferrites was confirmed by X-ray diffraction patterns (XRD). The ferrite series was studied in terms of DC electrical conductivity and thermoelectric power in the temperature ranging from room temperature to 300°C and 400°C, respectively. It was observed that DC electrical conductivity and Seebeck coefficient α decreased with the increase in x. DC electrical conductivity was found to decrease by about 4 orders. All the compositions showed a negative Seebeck coefficient exhibiting n-type semiconducting nature. From the above experimental results, activation energy and mobility of all the samples were estimated. Small polaron hopping conduction mechanism was suggested for the series of ferrites. Owing to their low conductivity the nonstoichiometric MgCuZn ferrites are the best materials for transformer core and high definition television deflection yokes.

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Electrical transport properties of manganese-magnesium mixed ferrites

Cited by 36 publications

References 6 publications

Electrical Properties of Cadmium Substitution in Nickel Ferrites

Electrical Properties of Cadmium Substitution in Nickel Ferrites

Thermoelectric power studies of Ca–Co ferrites

DC conductivity and Seebeck coefficient of nonstoichiometric MgCuZn ferrites

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