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Use of Vanadium Oxide as a Liquid Phase Sintering Aid for Barium Hexaferrite
John G. Fisher,Phan Gia Le,Hak-Sang Han,Su-Min Jeong,Naomi Karina Cabral de Leon,Alejandro Danies Lopez 한국자기학회 2018 Journal of Magnetics Vol.23 No.3
The use of V₂O5 as a liquid phase sintering aid for BaFe12O19 is studied. Three weight % of V₂O5 is added to a BaFe12O19 powder, samples are sintered at temperatures between 900-1250 °C and the effects of sintering aid addition on densification, microstructure, phase purity and magnetic properties are examined. Compared to BaFe12O19 without sintering aid addition, addition of 3 wt% V₂O5 leads to a moderate improvement in densification behavior. Samples with 3 wt% V₂O5 addition contain considerable amounts of Fe₂O₃ and Ba₃(VO₄)₂ second phases. The BaFe12O19 sample without sintering aid addition has a Magnetization-Field hysteresis loop typical of a hard ferrimagnetic material, whereas the 97 wt% BaFe12O19 - 3 wt% V₂O5 sample has a hysteresis loop with reduced saturation magnetization and coercivity.