J. Phys. IV France 07 (1997) C1-69-C1-70
Crystal Oriented Manganese Zinc Ferrites Made from Acicular Fine ParticlesN. Hiratsuka1, K. Kakizaki1 and M. Sugimoto2
1 Department of Functional Materials Science, Faculty of Engineering, Saitama University, 255 Shimo-Ohkubo, Urawa 338, Japan
2 Department of Culture Information, Teikyo Heisei University, Uruido, Ichihara 290-01, Japan
The acicular Mn-Zn ferrite fine particles composed of 65.6 mol% Fe, 21.9 mol% Mn and 12.5 mol% Zn were made. These Mn-Zn ferrite particles were etched in 1N-HCl solution for 3hrs.. The fine particle was made up of several crystallites whose long axis were 0.2-1.0µm, and arranged to <311> direction. These fine particles were pressed with applying magnetic field. The oriented Mn-Zn ferrites were prepared by sintering at 1250°C for 4hrs. in air and then cooling in nitrogen atmosphere. The oriented Mn-Zn ferrite exhibited strong crystal orientation similar to the single crystal of it. The magnetic anisotropy constants were K1=2.5 X 103erg/cc and K2=-0.2 X 103erg/cc and the easy magnetization axis was <100> direction.
© EDP Sciences 1997