Co-Zn substituted ferrites with the formula Co1-xZnxLa0.025Fe1.975O4 with 0.1≤x ≤0.9 was prepared by conventional solid state reaction. X- ray diffraction (XRD), scanning electron microscope (SEM) and magnetic susceptibility (χ) are utilized in order to study the effect of variation in Zn content and its impact on crystal structure, magnetic properties such as (χ), Curie temperature (TC), and exchange interaction constant (J) between the different cations. The results of XRD reveal that, assured the single phase cubic spinel structure for all investigated samples with appearance of small peaks represented a secondary phase due to the presence of rare earth (La3+) ions. The particle size (t) varied with composition and heat treatment. The value of both TC and J decreases with increasing Zn content up to the critical concentration (0.5) then increases. The scanning electron micrographs indicate the distribution of grains in the sample with uniform size and agree well with the results of X- ray analyses. The influence of rare earth ions substitution on the structure and magnetic properties was examined.
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