Author/Authors :
Tian، نويسنده , , Z.M. and Yuan، نويسنده , , S.L. and Yuan، نويسنده , , S.J. and Xie، نويسنده , , H.Y. and He، نويسنده , , J.H. and Wang، نويسنده , , Y.Q. and Liu، نويسنده , , K.L. and Yin، نويسنده , , S.Y.، نويسنده ,
Abstract :
In order to investigate the effect of annealing conditions on the structural and magnetic properties, Vanadium-doped TiO2 powders have been synthesized by a sol–gel technique in air and then postannealed in argon atmosphere at different temperatures from 500 to 850 ∘C. It is shown that the samples transform from anatase phase to rutile phase of TiO2 as the annealing temperature increases to 700 ∘C. Meanwhile, room temperature ferromagnetism is enhanced after postannealing in argon atmosphere and the ferromagnetism increases with annealing temperatures. A plausible explanation for the enhancement of ferromagnetism with annealing temperatures is presented in terms of bound magnetic polaron model.
