MAGNETIC-PROPERTIES OF THE ANATASE PHASE OF TIO2

Magnetic susceptibility measurements of anatase single crystals of TiO2 are reported for the first time. The anatase single crystals behave like a large gap semiconductor with a shallow donor level at 5 meV. The susceptibility measured by ESR is due to electrons localized on the donor state while the static susceptibility reveals the carriers thermally excited into the conduction band. The lattice contribution of the susceptibility is dominated by a net Van Vleck paramagnetism surprisingly lower in magnitude than in the rutile phase.