2008 Volume 33 Issue 4 Pages 969-972
Vanadium and iron doped rutile-type TiO2 were prepared by mechanical milling(MM) at 500 rpm for 15 minutes from the powder mixtures of (x/2)V2O5 (V2O3) + (1-x)TiO2 and (x/2) gamma-Fe2O3 +(1-x)TiO2. XRD results showed the particle diameter d was about 10 nm for host TiO2 powder by MM, and MM for the mixtures of V2O5/TiO2 and gamma-Fe2O3/TiO2 realizes the V and Fe doped TiO2 nano powders. Magnetization measurement showed that M at 300K and 5 kOe was 0.002(x=0.1 )-0.004(x=0.05) micro B/V-ion for Vx Ti1-xO2, 0.024(x=0.05)-0.035(x=0.1) micro B/Fe-ion for FexTi1-xO2. Thus the diluted ferro-magnetic semiconductor powder of (V,Fe)xTi1-xO2 with Tc higher than room temperature were successfully prepared by MM. But all of them were insulators, and not half metallic.
