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The optical properties of bismuth germanium oxide single crystalsKeywords: Czochralski technique , bismuth germanium oxide , single crystals , optical properties , optical phonons Abstract: Bi12GeO20 single crystals were grown by the Czochralski technique. Suitable polishing and etching solutions were determined. Reflection spectra were recorded in the wave numbers range 20 5000 cm 1, and compared with the spectra of Bi12SiO20 single crystals to study the position of the phonon modes. The optical constants of the Bi12GeO20 single crystals were obtained using Kramers-Kronig analysis. The obtained results are dicussed and compared with published data.
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