Abstract

 
 
 
 Ferrite with the general formula CuLayFe2-yO4 (where y=0.02, 0.04, 0.06, 0.08 and 0.1), were prepared by standard ceramic technique. The main cubic spinel structure phase for all samples was confirmed by x-ray diffraction patterns with the appearance of small amount of secondary phases. The lattice parameter results were 8.285-8.348 Å. X-ray density increased with La addition and showed values between 5.5826 – 5.7461gm/cm3. The Atomic Force Microscopy (AFM) showed that the average grain size was decreasing with the increase in La concentration. The Hall coefficient was found to be positive. It demonstrates that the majority of charge carriers of p-type, suggesting that the mechanism of conduction is predominantly caused by hopping of holes. The resistivity was noticed to increase with the increase in La substitution. The activation energy Eav decreased with the frequency increase. The AC conductivity was found to increase with the frequency and La addition. Dielectric constant was noticed to decrease with frequency and La addition. The dielectric loss factor decreased with La content because rare earths are known as low dielectric loss materials.
 
 
 
Highlights
Electrical and magnetic properties of spinel ferrites depend upon the method of preparation, nature of dopants, dopant concentration, etc
Et al (1973), studied the effect of small amount of ions of a rare-earth elements (REE) on the properties of ferrites with a spinel structure, where it was shown that such ferrites possess a slight solubility for ions of the REE and that it is the composition within the solubility range that exhibit interesting properties [9]
To summarize the main ideas obtained, the following conclusion can be drawn from this work: 1. X-ray density generally increased with La addition and showed values between 5.5826 – 5.7461 gm/cm3
Summary
Electrical and magnetic properties of spinel ferrites depend upon the method of preparation, nature of dopants, dopant concentration, etc. Is one of the important spinel ferrites because it exhibits phase transitions, changes semiconducting properties, shows electrical switching and tetragonality variation when treated under different conditions in addition to interesting magnetic and electrical properties with chemical and thermal stabilities [1]. It is used in the wide range of applications in gas sensing [2], catalytic applications [3,4,5], Li ion batteries [6] high density magneto-optic recording devices, color imaging, bio processing, magnetic refrigeration and ferrofluids [1,2,3,4,5,6,7]. The purpose of this work is to study the structural, electrical and dielectric properties of copper ferrites as a function of composition and frequency
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