Structural model of thin (GeSe_5)_(1-x)TI_x films

摘要

Far-infrared spectra of thin films from the Ge-Se-Tl system are investigated. The results are interpreted in terms of the vibrations of the isolated molecular units. The experimental results are compared with simulated spectra based on the theory of strong oscillators. Six optical phonons are found using a spectral computer program (‘Layers'). Raman spectra of thin films from the Ge-Se-Tl system are investigated. Modes associated with the Se-Se, Se-Ge and Se-Tl bonds are obtained. On the basis of the determined bonds a structural model of the glasses is peoposed.