Abstract
Cobalt environment and magnetic defects nature in hydrothermal synthesized anatase CoxTi1−xO2 nanopowders (0 ≤ x ≤ 0.1) are investigated by x-ray diffraction and a variety of spectroscopic techniques. One shows that cobalt is partially inserted in the anatase lattice, as Co2+ ions located on substitutional and interstitial sites. The fraction of the diluted Co is limited to 3 at. % for x ≥ 0.05, while the rest of the Co atoms gather into Co3O4 clusters. As found by electron paramagnetic resonance, the Co doping brings about hole- and electron-excess defects.
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