Effects of Initial Composition and Oxygen Pressure on Formation of Quasi-Nanocrystalline Ba–Zn Ferrite Powders during Self-Propagating High-Temperature Synthesis

概要

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Quasi-nano sized BaxZn1-xFe2O4 ferrites were prepared using self-propagating high-temperature synthesis (SHS) with different initial compositions of BaO2 and ZnO and various oxygen partial pressures of 0.25–1.0 MPa. The combustion temperature and the combustion propagating rate increased with decreases in the molar ratio of barium oxide to zinc oxide and oxygen partial pressure in the ranges of 860–1208 K and 4.9–6.0 mm/s, respectively. As the oxygen pressure during SHS reaction increased from 0.25 to 1.0 MPa, the maximum magnetization ($M_{\text{s}}$) level, the residual magnetization ($M_{\text{r}}$) level and the coercive force ($_{\text{i}}H_{\text{c}}$) changed from 0.580 to 1.932 A$\cdot$m2/kg, from 0.110 to 0.472 A$\cdot$m2/kg, and from 12.49 to 24.11 kA/m, respectively.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-01-25