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Electrical Properties of Cadmium Substitution in Nickel Ferrites
Department of Physics, Osmania University, Hyderabad, India
Department of Physics, University College of Science, Osmania University, Hyderabad, India
Department of Physics, Nizam College, Basheerbagh Osmania University, Hyderabad, India
Department of Physics, University College of Science, Osmania University, Hyderabad, India
Department of Chemistry, University College of Science, Osmania University, Hyderabad, India
Department of Chemistry, University College of Science, Osmania University, Hyderabad, India
Department of Physics, Osmania University, Hyderabad, India
- 1 Department of Physics, Osmania University, Hyderabad, India
- 2 Department of Physics, University College of Science, Osmania University, Hyderabad, India
- 3 Department of Physics, Nizam College, Basheerbagh Osmania University, Hyderabad, India
- 4 Department of Physics, University College of Science, Osmania University, Hyderabad, India
- 5 Department of Chemistry, University College of Science, Osmania University, Hyderabad, India
- 6 Department of Chemistry, University College of Science, Osmania University, Hyderabad, India
- 7 Department of Physics, Osmania University, Hyderabad, India
World Journal of Condensed Matter Physics·Volume 02 (2012)·Pages 257–266·Published 15 November 2012·DOI10.4236/wjcmp.2012.24043
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Abstract
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.
KeywordsNi-Cd FerriteThermo Electric PowerSeebeck CoefficientCharge Carrier ConcentrationElectrical Conductivity
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