부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jmmm.2006.01.109 Byline: Pan Xiaoyan, Jiang Dongmei, Lin Yan, Ma Xueming Keywords: Diluted magnetic semiconductor; High-energy ball milling; Fe-doped TiO.sub.2; Mossbauer spectroscopy; Ferromagnetism Abstract: Fe-doped TiO.sub.2 powder was prepared by high-energy ball milling, using TiO.sub.2 Degussa P-25 and [alpha]-Fe powders as the starting materials. The structure and magnetic properties of the Fe-doped TiO.sub.2 powder were studied by X-ray diffraction,.sup.57Fe Mossbauer spectroscopy and vibrating sample magnetometer. The Reitveld refinement of XRD revealed that ball milling not only triggered incorporation of Fe in TiO.sub.2 lattice but also induced the phase transformation from anatase to rutile in TiO.sub.2 and consequently the milled Fe-doped TiO.sub.2 powder contained only rutile..sup.57Fe Mossbauer effect measure showed that Fe atoms existed in Fe.sup.2+ and Fe.sup.3+ state, which were assigned to the solid solution Fe.sub.x Ti.sub.1- .sub.x O.sub.2. The magnetization measurements indicated that the milled Fe-doped TiO.sub.2 powder was ferromagnetic above room temperature. The ferromagnetism in our milled Fe-doped TiO.sub.2 powder seemingly does not come from Fe and iron oxides particles/clusters but from the Fe-doped TiO.sub.2 powder matrices. Author Affiliation: Department of Physics, East China Normal University, Shanghai 200062, PR China Article History: Received 14 September 2005; Revised 18 January 2006