Semiconducting properties of oxidized and reduced polycrystalline TiO₂ Jonker analysis

The present work considers semiconducting properties of polycrystalline TiO 2 in terms of the formalism proposed by Jonker. It is shown that the linearized form of the Janker equation can be successfully applied for systems with sparse experimental data. The results of the analysis indicate different semiconducting properties of oxidized and reduced TiO 2. The determined band gap of oxidized TiO 2 varies between 2.32 eV at 1123 K and 3.72 eV at 1323 K. The data determined in reduced conditions (10 -13 Pa < p(O 2) < 10 -5 Pa) can not be well described by the Jonker formalism.