Influence of vanadium pentoxide addition on the structural and electromagnetic properties of Li-Zn ferrites

Abstract

The influence of V2O5 addition on the microstructural, electrical and magnetic properties of Li-Zn ferrites having the compositions Li0.25Zn0.50Fe2.25O4 + xV2O5 (where x = 0.0, 0.4, 0.8 and 1.2 wt %) are reported in this study, where the samples are sintered at 1050 oC. The X-ray diffraction patterns confirmed that the crystal structures of all the prepared samples were the cubic spinel phase. Microstructural studies showed that the average grain sizes were increased from 5.3 (for x = 0.0 wt%) to 7.7µm (for x = 0.8 wt% V2O5), which could be attributed to the role of V2O5 as sintering aid to enhance the densification of the samples. The magnetic hysteresis analysis demonstrated that the saturation magnetizations were increased from 44.0 (for x = 0.0 wt%) to 50.3 emu/g (for x = 0.8 wt% V2O5). However, the saturation magnetization was found to decrease for x = 1.2 wt% V2O5, which may be related to weaken of exchange interaction due to the introduction of excess non-magnetic V2O5. The complex initial magnetic permeability has been studied, and it shows that the enhancement of the permeability is clearly evidenced on V2O5 addition. The complex impedance spectroscopy through Cole-Cole plot has demonstrated a partial semicircular arc, which indicates that the conduction mechanism takes place predominantly through the grain property.