Electrical and Optical Investigation of Absorption Centers in Rutile Single Crystals

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Abstract
Absorption centers in single crystals of rutile, causing relaxation spectra in the low-frequency range, can be produced by thermal quenching or optical irradiation at the edge of the characteristic absorption region (4200 A). They are only observed when the ac field is applied parallel to the optic axis. The temperature dependence of the main dispersion peak indicates an activation energy of 0.18 ev. Introduction of silver or copper by thermal diffusion did not produce low-frequency absorption maxima.

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