INFLUENCE OF ZINC SUBSTITUTION ON SOME PHYSICALPROPERTIES OF Co-La FERRITE

摘要

Co- Zn substituted ferrites with the formula Co_(1-x)Zn_xLa_(0.025)Fe_(1.975)O_4with 0.1≤x≤0.9 was prepared by conventional solid statereaction. X- ray diffraction (XRD), scanning electron microscope (SEM) and magnetic susceptibility (x) are utilized in order to study theeffect of variation in Zn content and its impact on crystal structure, magnetic properties such as (x), Curie temperature (TO, and exchangeinteraction constant (J) between the different cations. The results of XRD reveal that, assured the single phase cubic spinel structure for allinvestigated samples with appearance of small peaks represented a secondary phase due to the presence of rare earth (La~(3+)) ions. Theparticle size (t) varied with composition and heat treatment. The value of both T_C and J decreases with increasing Zn content up to thecritical concentration (0.5) then increases. The scanning electron micrographs indicate the distribution of grains in the sample withuniform size and agree well with the results of X- ray analyses. The influence of rare earth ions substitution on the structure and magneticproperties was examined.