Pressure Raman study of vibrational modes of glassy As₂X₃ (X: O, S)

Abstract

Pressure effects on the vibrational modes of As₂O₃ glass have been investigated with the aid of Raman scattering. Emphasis was put on both the intramolecular vibrational modes at high energies as well as the low-energy excitations (Boson peak) of the glass. The pressure dependence of the spectral features of Raman bands was found to be significantly different compared with the corresponding features of the structurally similar As₂S₃. Striking dissimilarities were also observed for the pressure dependence of the Boson peak in these two glasses.

Keywords:

• Raman
• Glasses
• High pressure
• As₂O₃
• As₂S₃

Acknowledgements

K.S.A. acknowledges financial support from the project ‘PYTHAGORAS I’ funded by the Greek Ministry of National Education and Religion Affairs.