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Effect of nd^(3+) substitution on structural and magnetic properties of Mg-Cd ferrites synthesized by microwave sintering technique

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Journal of Rare Earths 2018年第4期36卷 390-397页

作者： S.R.Bhongale H.R.Ingawale T.J.Shinde p.n.vasambekar Department of physics Yashavantrao Chavan Institute of Science Department of physics B.V.M.B.S.K.Kanya Mahvidyalaya Department of physics K.R.P.Kanya Mahvidyalaya Department of Electronics Shivaji University

nd3＋ substituted spinel ferrites with formula MgxCd1-xnd0.03Fe1.97O4（x = 0.0.2,0.4,0.***.0.8 and 1.0）were prepared by oxalate co-precipitation method using novel microwave sintering technique. AR grade sulphates were used as starting chemicals. The samples were sintered at optimized power of 70 W for10 min in a microwave oven（800 W）. The structural analysis of these samples was done by using X-ray diffraction, scanning electron microscope and Fourier transform IR techniques. The XRD analysis of the synthesized ferrite confirms the formation of cubic spinel structure of ferrite. The influence of nd3＋substitution on various structural parameters of Mg-Cd ferrites was reported. IR study indicates the spectra contain two intense absorption bands around 600 and 400 cm^（-1） in addition with four extra bands. The magnetic properties of all ferrites were studied by using a vibration sample *** crystallite and grain size dependant magnetic properties are observed. The composition Mg_（0.6）Cd_（0.4）nd_（0.03）Fe_（1.97）O_4 has better magnetic properties that can be used in recording media. The fast synthesis of spinel ferrites is yielded due to use of the microwave sintering technique.

关键词： Mg-nd-Cd ferrite Rare earth Microwave sintering IR study Coercive force

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Electrical switching in cadmium ferrite with different rare-earth ions(Sm^(3+), Y^(3+), and La^(3+))

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Rare Metals 2015年第2期34卷 133-136页

作者： Sanjeev p.Dalawai Ashok B.Gadkari pramod n.vasambekar Department of Electronics Shivaji University Department of physics Gopal Krishna Gokhale College

The cadmium ferrite and 5 % rare-earth ions（Sm^3＋, Y^3＋, and La^3＋） added Cd ferrites were synthesized by oxalate co-precipitation method and characterized by X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR）, and scanning electron microscope（SEM） techniques. All ferrite samples under investigation exhibit current-controlled negative resistance type I–E characteristics at room temperature. The required electrical-switching field in cadmium ferrite is higher than that for 5 % Sm^3＋, Y^3＋, and La^3＋added cadmium ferrites. The5% addition of Sm^3＋, Y^3＋, and La^3＋ in cadmium ferrite is found to decrease the grain size in this ferrite. This decrement in the grain size makes the required switching field to decrease in cadmium ferrite. no aging effect for electrical switching is observed in these ferrites.

关键词： Rare-earth ions Current-controlled negativeresistance type electrical switching Grain size Cd ferrite

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