Electrical Properties of Cadmium Substitution in Nickel Ferrites

Ande Ashok, Thatikonda Somaiah, Dachepalli Ravinder, Chinnala Venkateshwarlu, Chandiri Sudhakar Reddy, Kappera Nageshwar Rao, Meesala Prasad

Department of Chemistry, University College of Science, Osmania University, Hyderabad, India.
Department of Physics, Nizam College, Basheerbagh Osmania University, Hyderabad, India.
Department of Physics, Osmania University, Hyderabad, India.
Department of Physics, University College of Science, Osmania University, Hyderabad, India.

DOI: 10.4236/wjcmp.2012.24043                

Abstract

Electrical transport properties such as conductivity (σ) and thermo electric power (S) of Cadmium substituted Nickel Ferrites, forming chemical formula Ni_1–xCd_xFe₂O₄, 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.

Keywords

Ni-Cd Ferrite; Thermo Electric Power; Seebeck Coefficient; Charge Carrier Concentration; Electrical Conductivity

Conflicts of Interest

The authors declare no conflicts of interest.

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