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Please use this identifier to cite or link to this item: http://purl.org/purl/4350

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
Authors: Anantharaman, M R
Malini, K A
Swapna, Nair S
Joy, P A
Mathew, George
Issue Date: 2-Mar-2007
Publisher: IOP Publishing LTD
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
Description: J. Phys. D: Appl. Phys. 40 (2007) 1593–1602
URI: http://dyuthi.cusat.ac.in/purl/4350
Appears in Collections:Dr. M R Anantharaman

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