Original scientific paper
Electrical and thermoelectrical properties of pure and substituted copper ferrites
Mohamed A. Ahmed
; Physics Department, Faculty of Science, Tanta University, Tanta, Egypt
Mohamed A. El-Hiti
; Physics Department, Faculty of Science, Tanta University, Tanta, Egypt
Mohamed E. El-Shabasy
; Physics Department, Faculty of Science, El-Minia University, El-Minia, Egypt
Abstract
Samples of the CuFe2-xAlxO4 system with x=0, 0.2, 0.4 and 0.6 were prepared. The single phase spinel structure was verified by X-ray diffraction method. The thermoelectric power (a) and dc electrical resistivity (r) were studied as a function of temperature and composition. The results show that the resistivity increases and the transition temperature decreases with increasing the aluminium substitution. The activation energy in ferrimagnetic region is lower than that in paramagnetic region. The drift mobility of carriers increases exponentially with temperature as expected for ferrites.
Keywords
Hrčak ID:
299422
URI
Publication date:
1.3.1994.
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