Comparative Studies on Impact of Lithium Substitution in Nano Magnesium Ferrite
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.238
Comparative Studies on Impact of Lithium Substitution in Nano Magnesium Ferrite Ravi Kant1 and Ajay Kumar Mann2 1
Research Scholar, Shri JJT University, Jhunjhunu, Rajasthan, India
2
Asst. Professor, Govt. College for Women, Lakhan Majra, Rohtak, Haryana, India
ABSTRACT
Lithium substituted magnesium ferrites (LixMg1-xFe2O4, where x = 0.1 to 0.5) were synthesized by solid state reaction method. Various characterization techniques viz. X - Ray Diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM) and fourier transform infrared spectroscopy (FTIR) were used to study the effect of lithium substitution. Differences in particle size, crystallinity and magnetic parameters of the ferrites synthesized with difference in composition were observed. XRD patterns of the synthesized samples confirmed phase purity and showed that the lattice parameter decreases with increase in Li content in magnesium ferrite. Decrease in coercivity with increase in lithium concentration was observed from magnetic analysis (VSM). Through FTIR, it was observed that Li+ ions occupy B – sites. FTIR spectrum peaks obtained in the region 1620 – 1670 cm-1 supported water molecule dissociation. It is the required characteristic of the lithium substituted magnesium ferrite to be used in various applications like humidity sensor and hydroelectric cell. E-mail address: [email protected] (Ajay Kumar Mann)
Introduction Spinel ferrites have attracted special attention due to their chemical stability and high electrical resistivity. With general formula MFe2O4, spinels have number of applications in information storage system, microwave devices, hyperthermia, magnetic recording media, electronic industries, green anode materials and humidity sensors [1 – 4]. Magnesium ferrite (MgFe2O4) is a soft magnetic material and belongs to partially inverse spinel ferrite. The degree of inversion depends on the method of preparation and 1649
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thermal history of the material [5]. Certain properties like high resistivity, environmental stability and high magnetic Curie temperature make magnesium ferrite suitable for wide range of sensing applications [6, 7]. The cation distribution in the ferrite depends on thermal treatment, molar ratio, method of synthesis, precursors and doping etc. This can affect many properties structural, magnetic, electrical and catalytic activity properties [8, 9]. The structural and magnetic properties of MgFe2O4 with substitution of non magnetic Cd2+, Cr3+, Ca2+, Ce3+, Zn2+ and Al3+ have been studied by X-Ray diffraction (XRD), scanning electron microscope (SEM) and vibrating sample magnetometer (VSM) [10 –14]. Some work on properties of magnesium ferrite with Li+ substitution such as Lix
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