Abstract
The Mössbauer study of Fe 57 in polycrystalline solid solutions of Ni 1 + x − y Zn y Sn x Fe 2 − 2 x O 4 ( y = 0.1, 0.3, 0.5 and x = 0.1 to 0.5 with x varying in steps of 0.1) has been made. The present work has been aimed at investigating the variation of isomer shift, nuclear magnetic field at Fe 57 nuclei and ionic distribution at tetrahedral and octahedral sites when the concentration of Zn 2+ and Sn 2+ ions is successively increased in nickel ferrites. The ionic distribution in samples having low tin concentration has been explained on the basis of Neel's molecular field model whereas the ionic distribution of samples having high tin and zinc concentration has been explained on the basis of formation of isolated superparamagnetic clusters at the octahedral site. It has been inferred that a larger substitution of zinc and tin ions enhances relaxation effects.
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