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

Abstract

Raman scattering and infrared absorption measurements have been performed on amorphous Ge _x Se _{1- x} with 0≦ x ≦0.4 and crystalline GeSe ₂ . Molecular model is applied to explain the vibrational spectra of amorphous GeSe ₂ . Variation of Raman spectra in Ge _x Se _{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 GeSe ₂ are very similar; suggesting that amorphous GeSe ₂ may have the same local order as crystalline GeSe ₂ .