Mössbauer study of Zn2+ and Sn4+ additives in Nickel ferrites |
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Authors: | RK Puri Usha Varshney |
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Institution: | Department of Physics, Indian Institute of Technology, Delhi, New Delhi-110 016, India |
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Abstract: | The Mössbauer study of Fe57 in polycrystalline solid solutions of Ni1 + x ? yZnySnxFe2 ? 2xO4 (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 Fe57 nuclei and ionic distribution at tetrahedral and octahedral sites when the concentration of Zn2+ and Sn2+ 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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