Abstract
Spinel lithium ferrite ceramics inherently possess useful properties like high resistivity, saturation magnetization and Curie temperature, rectangular hysteresis loop and low dielectric and magnetic losses. They find widespread applications in high frequency electronic devices. Attempting an enhancement in the properties of interest, lithium ferrites were prepared by adding V2O5 and Na2SiO3 additives. Samples having Li0.5 Fe2.5O4 + (0.1) V2O5 + (x) Na2SiO3 as representative formula where x = 0.0, 0.05, 0.10, 0.15, 0.20, 0.25 were prepared by the ceramic technique using high energy ball milling. The prepared samples were calcined at 650 °C for 1h and sintered at 950 °C for 1h. XRD was done on the sintered samples and it is found that the samples possessed single phase with spinel structure. From the XRD data various structural parameters were evaluated. The microstructure of these samples was studied from the SEM micrograph. The room temperature frequency variation of initial permeability and permeability loss were measured in the range 5MHz to 40MHz using an impedance Analyzer. The results of these measurements are discussed in the paper.
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