Local Co structure in epitaxialCoxTi1−xO2−xanatase

We have used Co K-shell near-edge and extended x-ray absorption fine structure to investigate the charge state and local structure surrounding Co in epitaxial Co-doped ${\mathrm{TiO}}_2$ anatase grown on ${\mathrm{LaAlO}}_3\mathrm{}\left(001\right).$ Co is in the +2 formal oxidation state throughout the film, and substitutes for Ti in the lattice, creating a nearby oxygen vacancy in the process. There is no evidence for either elemental Co or CoO in the films.