Structural and magnetic properties of V₂O₅-Na₂SiO₃ added Li_0.5Fe_2.5O₄ spinel ferrite ceramics prepared by high energy ball milling

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 Li_0.5 Fe_2.5O₄ + (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.

Keywords:

• Ceramics; lithium ferrites; XRD; SEM; initial permeability