Abstract
Electrical transport properties such as conductivity (σ) and thermo electric power (S) of Cadmium substituted Nickel Ferrites, forming chemical formula Ni1–xCdxFe2O4, 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 103/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.
Highlights
The conditions of the preparation play an important role in site preference of the cations and all other properties of the spinal ferrites
The values of charge carrier concentration and mobility have been computed from experimental values of Seebeck coefficient and electrical conductivity
As far as the authors are aware of the study, the ac electrical conductivity and thermo electric power of the mixed Ni-Cd ferrites play as a function of composition and temperature
Summary
The conditions of the preparation play an important role in site preference of the cations and all other properties of the spinal ferrites. The values of charge carrier concentration and mobility have been computed from experimental values of Seebeck coefficient and electrical conductivity.
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