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Progress In Electromagnetics Research Letters
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INFLUENCE OF TIME AND TEMPERATURE ON RESISTIVITY AND MICROSTRUCTURE OF Cux Co1-x Fe2 O4 MIXED FERRITES

By B. K. Bammannavar, L. R. Naik, R. B. Pujar, and B. K. Chougule

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Abstract:
Copper-cobalt ferrites with general chemical formula CuxCo1-xFe2O4 (with x = 0.0, 0.4, 0.6 & 1.0) were prepared by ceramic method. The solid state reaction was confirmed by XRD patterns. DC conductivity was measured by two probe method. Electrical resistivity is found to increase on lowering of sintering temperature and time. At x = 1.0, the conduction is mainly due to hopping of electrons leading to n-type conductivity while at x = 0.0, conduction is due to holes leading to P-type conductivity. The lowest conduction at x = 0.4 is attributed to the electron hole compensation. SEM micrographs were obtained from JEOL scanning electron microscope. The micrographs reveal that an average grain size increases with sintering temperature and time as a result of decrease in porosity. This leads to the decrease in resistivity with sintering temperature and time. One of the factors for higher conductivity in ferrites is an increase in average grain size and decrease in pore concentration during the heat treatment.

Citation:
B. K. Bammannavar, L. R. Naik, R. B. Pujar, and B. K. Chougule, "Influence of Time and Temperature on Resistivity and Microstructure of CuX Co1-X FE2 O4 Mixed Ferrites," Progress In Electromagnetics Research Letters, Vol. 4, 121-129, 2008.
doi:10.2528/PIERL08061101
http://www.jpier.org/pierl/pier.php?paper=08061101

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