Author: A. Tawfik 1
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  • 1 Department of Physics, Faculty of Science Tanta University Tanta Egypt
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A series of samples in the system Co1−xZnxFe2O4 (x=0.3, 0.4, 0.6, 0.8 and 1) were prepared by the usual ceramic technique. The D. C. electrical resistivity and thermoelectric power were measured in the temperature range from room temperature up to about 600 K. Transition from the ferrimagnetic region to the paramagnetic region is accompanied by an increase in the activation energy by an amountΔE, which varies in the range 0.052–0.090 eV. The large values ofΔE obtained may be due to the fairly strong B-B exchange interaction in Co-Zn ferrites.