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Improved electrical and dielectric properties of La-doped Co ferrite

Published online by Cambridge University Press:  11 January 2011

K. Kamala Bharathi  and
C.V. Ramana
K. Kamala Bharathi
Affiliation:
Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas 79968
C.V. Ramana*
Affiliation:
Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas 79968
*
a)Address all correspondence to this author. e-mail: rvchintalapalle@utep.edu
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Abstract

We report on the enhanced dielectric constant and electrical resistivity of the Co-ferrite (CoO.Fe2O3) by partially substituting Fe with La. Structural characteristics of La-doped Co ferrite namely CoO.Fe1.925La0.075O3 indicate the cubic inverse spinel phase with a small amount of LaFeO3 additional phase. The lattice parameter obtained is 8.401 Å (±0.001 Å), which is higher than that reported for Co ferrite (8.387 Å, ±0.001 Å). The dielectric constant and electrical resistivity of CoO.Fe1.925La0.075O3 are higher compared with pure Co ferrite. The dielectric constant dispersion of CoO.Fe1.925La0.075O3 in the frequency range of 100 Hz to 1 MHz fits to the modified Debye’s function with more than one ion contributing to the relaxation. Temperature-dependent electrical resistivity curves exhibit two distinct regions indicative of two different types of conduction mechanisms. Analysis of the data indicates that the small polaron and variable-range hopping mechanisms are operative in the 220 to 300 K and 160 to 220 K temperature regions, respectively.

Keywords

Dielectric propertiesElectrical propertiesStructural

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Type
Articles
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Journal of Materials Research , Volume 26 , Issue 4 , 28 February 2011 , pp. 584 - 591
Copyright
Copyright © Materials Research Society 2011

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