Abstract
Fine particles of cobalt ferrite were synthesized by the sol-gel method. Subsequent heat treatment at different temperatures yielded cobalt ferrites having different grain sizes. X-ray diffraction studies were carried out to elucidate the structure of all the samples. Dielectric permittivity and ac conductivity of all the samples were evaluated as a function of frequency, temperature and grain size. The variation of permittivity and ac conductivity with frequency reveals that the dispersion is due to Maxwell-Wagner type interfacial polarization in general, with a noted variation from the expected behaviour for the cold synthesized samples. High permittivity and conductivity for small grains were explained on the basis of the correlated barrier-hopping model.
George, Mathew;
[1]
Nair, Swapna S;
[1]
Malini, K A;
[1]
Joy, P A;
[2]
Anantharaman, M R
[1]
- Department of Physics, Cochin University of Science and Technology, Cochin-682 022 (India)
- Physical Chemistry Division, National Chemical Laboratory, Pune-411 008 (India)
Citation Formats
George, Mathew, Nair, Swapna S, Malini, K A, Joy, P A, and Anantharaman, M R.
Finite size effects on the electrical properties of sol-gel synthesized CoFe{sub 2}O{sub 4} powders: deviation from Maxwell-Wagner theory and evidence of surface polarization effects.
United Kingdom: N. p.,
2007.
Web.
doi:10.1088/0022-3727/40/6/001; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
George, Mathew, Nair, Swapna S, Malini, K A, Joy, P A, & Anantharaman, M R.
Finite size effects on the electrical properties of sol-gel synthesized CoFe{sub 2}O{sub 4} powders: deviation from Maxwell-Wagner theory and evidence of surface polarization effects.
United Kingdom.
https://doi.org/10.1088/0022-3727/40/6/001; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)
George, Mathew, Nair, Swapna S, Malini, K A, Joy, P A, and Anantharaman, M R.
2007.
"Finite size effects on the electrical properties of sol-gel synthesized CoFe{sub 2}O{sub 4} powders: deviation from Maxwell-Wagner theory and evidence of surface polarization effects."
United Kingdom.
https://doi.org/10.1088/0022-3727/40/6/001; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@misc{etde_20927350,
title = {Finite size effects on the electrical properties of sol-gel synthesized CoFe{sub 2}O{sub 4} powders: deviation from Maxwell-Wagner theory and evidence of surface polarization effects}
author = {George, Mathew, Nair, Swapna S, Malini, K A, Joy, P A, and Anantharaman, M R}
abstractNote = {Fine particles of cobalt ferrite were synthesized by the sol-gel method. Subsequent heat treatment at different temperatures yielded cobalt ferrites having different grain sizes. X-ray diffraction studies were carried out to elucidate the structure of all the samples. Dielectric permittivity and ac conductivity of all the samples were evaluated as a function of frequency, temperature and grain size. The variation of permittivity and ac conductivity with frequency reveals that the dispersion is due to Maxwell-Wagner type interfacial polarization in general, with a noted variation from the expected behaviour for the cold synthesized samples. High permittivity and conductivity for small grains were explained on the basis of the correlated barrier-hopping model.}
doi = {10.1088/0022-3727/40/6/001; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)}
journal = []
issue = {6}
volume = {40}
place = {United Kingdom}
year = {2007}
month = {Mar}
}
title = {Finite size effects on the electrical properties of sol-gel synthesized CoFe{sub 2}O{sub 4} powders: deviation from Maxwell-Wagner theory and evidence of surface polarization effects}
author = {George, Mathew, Nair, Swapna S, Malini, K A, Joy, P A, and Anantharaman, M R}
abstractNote = {Fine particles of cobalt ferrite were synthesized by the sol-gel method. Subsequent heat treatment at different temperatures yielded cobalt ferrites having different grain sizes. X-ray diffraction studies were carried out to elucidate the structure of all the samples. Dielectric permittivity and ac conductivity of all the samples were evaluated as a function of frequency, temperature and grain size. The variation of permittivity and ac conductivity with frequency reveals that the dispersion is due to Maxwell-Wagner type interfacial polarization in general, with a noted variation from the expected behaviour for the cold synthesized samples. High permittivity and conductivity for small grains were explained on the basis of the correlated barrier-hopping model.}
doi = {10.1088/0022-3727/40/6/001; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)}
journal = []
issue = {6}
volume = {40}
place = {United Kingdom}
year = {2007}
month = {Mar}
}