Optical properties of aluminum oxide after irradiation with cobalt ions

A. V. Kabyshev, F. B. Konusov

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Optical absorption of leucoosapphire and polycrystalline corund (polycor) is studied after irradiation with cobalt ions and subsequent annealing in a vacuum. The structure of states localized in the forbidden band and induced by various imperfections has a higher stability to annealing as compared to the case of implantation of other types of ions into aluminum oxide. The fan-like behavior of the dose-dependent absorption spectra is a consequence of the defect-induced disordering of crystal lattices. It is determined that intrinsic radiation-induced defects, substitutional defects, complexes containing them, and Co nanoparticles have an influence on the parameters of the focal point of the absorption spectra. The parameters of the interband and exponential absorption demonstrate the formation of a new multidefect material with a band gap width ranging from 5.3 to 5.5 eV and an absorption edge at 2.0-5.2 eV caused by the localized states of defect clusters.

Original languageEnglish
Pages (from-to)304-312
Number of pages9
JournalJournal of Surface Investigation
Issue number2
Publication statusPublished - Feb 2009


ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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