The magnetic properties of porous Ni-Zn ferrites prepared from wood templates

Abstract

The crystallographic and magnetic properties of porous Ni xZn1-xFe2O4 (x = 0.1, 0.5 and 0.9) from wood templates were investigated in this study. The nitrates aqueous precursor solution was infiltrated into the wood specimen at 60°C to retain the original shape and the microstructure of wood. The sintered bodies contained elongated pores enclosed by a thin layer of wall with the thickness about 1-2 μm. The grain size of polycrystalline ferrite was observed to be in the range of 1-1.5 μm. Each grain was horizontally connected to form polycrystalline walls of single-layered grains. The VSM measurement showed that there is an obvious difference of magnetic properties in the parallel and perpendicular direction due to the anisotropic structure of wood template. The coercivity perpendicular to the pores orientation was larger compared to the coercivity parallel to the pores orientation. It is also discovered that the optimum saturation magnetization was achieved at x = 0.5. © 2009 The Ceramic Society of Japan. A. R. Studart, U. T. Gonzenbach, E. Tervoot and L. J. Gauckler, J. Am Ceram. Soc., 89[6], 1771-1789 (2006). © 2009 The Ceramic Society of Japan 958.