Abstract

An infrared absorption study of natural anatase TiO2 is performed. A complex with absorption lines at 3355.9 and 3357.3 cm−1 is shown to consist of at least two equivalent hydrogen atoms, whereby these features are due to the stretch local vibrational modes of two OH bonds located in the basal plane of the anatase crystal, forming an angle of approximately 90°. The complex is shown to be electrically active with a level in the upper part of the bandgap. The microscopic model of the defect is discussed.

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