Influence of thermal treatments on phase formation and magnetic behaviour in metal transition doped TiO2

A.F. CABRERA, L. ERRICO, C.E. RODRıGUEZ TORRES, F.H. SANCHEZ

PHYSICA B - CONDENSED MATTER

Elsevier

Año: 2007 vol. 389 p. 103 - 106

0921-4526

Transition metal doped TiO2 samples, with nominal composition TM5(TiO2)95 (TM ¼ Mn, Fe, Co and Ni), were obtained by thermal treatment at 673, 773 and 973K in air to study the role of impurities in the origin of magnetism. X-ray diffraction (XRD) experiments only detect the rutile phase in the 673K thermally treated samples but evidence of other phases was detected by Mo¨ ssbauer spectroscopy and ac-susceptibility measurements. All samples presented magnetic behaviour. The estimated magnetic moments were lower than those obtained by ab initio calculations