Impurity Atoms in Milled Powders of ZnMO (M=Co, Fe)

M.MEYER; L.C. DAMONTE

POWDER TECHNOLOGY

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2015 p. 371 - 377

0032-5910

Fe and Co doped ZnO powders obtained by mechanical milling from different starting materials are presented. The local structural and the magnetic properties were investigated using X-ray diffraction, XAFS and magnetic measurements. The evolution of these properties with milling time, atomic content and milling atmosphere is analyzed. XAFS measurements revealed the progressive incorporation of doped atom into the ZnO wurtzite crystalline structure. Also the oxidation states of 2+ and 3+ for Fe atoms and 2+ for Co ones is confirmed. Furthermore, the presence of oxygen vacancies is predicted by EDAX and XAFS. These results in combination with previous ones will contribute to the comprehension of the controversial ferromagnetic behavior in these diluted semiconductor materials.