Investigation of electric transport behavior of bulk CoFe2O4 by complex impedance spectroscopy

•Study exposes evolution of grain and interfaces effect on bulk CoFe2O4.•Grain effects are dominated at lower temperature.•Interfacial polarization played important role at high temperature.•Multi oxidation states of Fe and Co regulates permittivity and conductivity. Cobalt ferrite synthesized by a...

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Bibliographic Details
Published in:Journal of alloys and compounds 2014-02, Vol.587, p.481-486
Main Authors: Panda, R.K., Behera, D.
Format: Article
Language:English
Subjects:
Alloys
Ceramics
Cobalt ferrites
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties of solids and liquids
Dielectric response
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Electrochemical impedance spectroscopy
Electrodes
Exact sciences and technology
Grain boundaries
Grains
Impedance
Mathematical models
Micrometers
Permittivity (dielectric function)
Physics
Sintering
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Summary:•Study exposes evolution of grain and interfaces effect on bulk CoFe2O4.•Grain effects are dominated at lower temperature.•Interfacial polarization played important role at high temperature.•Multi oxidation states of Fe and Co regulates permittivity and conductivity. Cobalt ferrite synthesized by a conventional ceramic route had confirmed its single phase from XRD pattern and well grain growth of micrometer range was found in SEM image. The study exposes for first time, the evolution of grains and interfaces (grain boundaries and electrode contact) effect in bulk CoFe2O4 in the temperature range 30°C–250°C as a function of frequencies varying from 100Hz–1MHz. The low temperature (
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.10.195