Effects of V₂O₅ Addition on the Magnetic Properties of Lithium-Zinc Ferrites

Abstract

The effects of V₂O₅ addition on the magnetic properties of Li-Zn ferrites have been studied. Samples were fired at 1050-1150°C for 2 hours in air. The squareness ratio, sintered density, saturation magnetization, Curie temperature, and order-disorder transition of Li-Zn ferrites were determined as functions of V₂O₅ addition.
The results obtained are summarized as follows.
(1) The maximum squareness ratio (B_r/B_m) were obtained by the addition of 0.1 wt% V₂O₅, but further increase in V₂O₅ content decreased B_r/B_m.
(2) The improvement of squareness ratio was due to the combination of small grain size and homogeneous grain size distribution.
(3) It was found from saturation magnetization, Curie temperature and lattice constant that a portion of V₂O₅ dissolved into ferrite. The result support the B-site ordering which decreased with increasing V₂O₅ content. It was shown that the decrease in octahedral site ordering by the addition of V₂O₅ is attributed to the incorporation of V ions in the spinel lattice and also to the separation of α-Fe₂O₃.