Abstract
Monodomain single crystals of BaTiO 3, grown by the Czochralski method in Dijon, show for light polarized perpendicular to the c-axis only one absorption line for the OH-stretch mode, in contrast to data reported so far. This single line has been observed in Raman scattering, as well. Additional structures appear for other light polarizations and in iron-doped samples. From the angular dependence of the polarized absorption of the OH-stretch mode we conclude that hydrogen vibrates against oxygen with a dipole axis being tilted by an angle of about 49° with respect to the tetragonal axis. The (tetragonal-cubic) phase transition is reflected in the temperature dependence of both the frequency and the halfwidth. The absorption lines in iron-doped crystals depend strongly on the growth process.
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