A study of network dimensionality in chalcogenide glass by low frequency Raman scattering

We have measured low frequency Raman spectra in Ge chalcogenide glasses. Th e dependence of spectral dimensionality of stretching fracton, (d) over til de(s), on the sample composition is obtained from low frequency reduced Ram an spectrum and is correctly correlated to the actual network dimensionalit y of Ge chalcogenide glasses. The value of (d) over tilde(s) is supposed to be a parameter representing the degree of localization of lattice vibratio ns and an indicator of network dimensionality of network glasses. The findi ngs on the interpretation of (d) over tilde(s) should be applied in future research of disordered systems. (C) 1999 Elsevier Science B.V. All rights r eserved.