@article { ISI:000245291700016,
	title = {Finite size effects on the electrical properties of sol-gel synthesized CoFe2O4 powders: deviation from Maxwell-Wagner theory and evidence of surface polarization effects},
	journal = {Journal of Physics D-Applied Physics},
	volume = {40},
	number = {6},
	year = {2007},
	month = {MAR},
	pages = {1593-1602},
	publisher = {IOP PUBLISHING LTD},
	type = {Article},
	address = {DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND},
	abstract = {<p>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.</p>},
	issn = {0022-3727},
	doi = {10.1088/0022-3727/40/6/001},
	author = {George, Mathew and Nair, Swapna S. and Malini, K. A. and Joy, Pattayil Alias and Anantharaman, Maliemadom R.}
}
