J. Phys. IV France 07 (1997) C1-743-C1-744
Nanocomposites of the Barium Ferrite/δ-Fe00H SystemI.-C. Tung1, L.H. Perng2, S.W. Wane1 and T.S. Chin1
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-Lin, Hsinchu, Taiwan, China
Fine δ-Fe00H particles were introduced onto the surface of barium ferrite particles. The method was to coat the barium ferrite particles with Fe2+ solution first at certain concentrations, followed by addition of NaOH(aq), and finally oxidized by 35 wt% H2O2(aq). The results showed that the coercivity of barium ferrite could be lowered greatly to 2290 Oe and its magnetization could be sustained at a level higher than 45 emu/g. It indicates that there exists an interaction between barium ferrite and δ-Fe00H fine particles, which leads to the decrease in coercivity, and this interaction is a matter of interface and may not bear dependency on whether chemical bonding is formed between them.
© EDP Sciences 1997