Raman and Infrared Studies on Vibrational Properties of Ge–Se Glasses

Abstract

Raman scattering and infrared absorption measurements have been performed on amorphous Ge_xSe_1−x with 0≤x≤0.4 and crystalline GeSe₂. Molecular model is applied to explain the vibrational spectra of amorphous GeSe₂. Variation of Raman spectra in Ge_xSe_1−x glasses with Ge composition shows that local order is not largely changed with the glass composition. The vibrational spectra, particularly infrared absorption spectra, of amorphous and crystalline GeSe₂ are very similar; suggesting that amorphous GeSe₂ may have the same local order as crystalline GeSe₂.