J. Phys. IV France 07 (1997) C1-745-C1-746
Magnetic Properties of Barium Ferrite Particles with Fe3O4 OvercoatI.-C. Tung1, L.H. Perng2, T.S. Chin1 and C.H. Lin1
1 Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan, China
2 Department of Chemical Engineering, Ta Hwa College of Technology and Commerce, Chung-Li, Hsinchu, Taiwan, China
Superparamagnetic Fe3O4 fine particles were introduced onto the surface of barium ferrite particles. The method was to coat the barium ferrite particles with a mixed solution of Fe3+ and Fe2+ first at certain concentrations, followed by addition of NaOH(aq). The results showed that the coercivity of barium ferrite could be lowered greatly while a high saturation magnetization value was sustained. It indicates that there exists an interaction between barium ferrite and Fe3O4 fïne particlesand this interaction is a matter of interface and may not bear dependency on whether chemical bonding is formed between them.
© EDP Sciences 1997