Structure of chalcogenide glasses in the As2Se3-CuI system

The structure of glasses in the system As2Se3-CuI have been investigated us ing X-ray diffraction, Raman and optical spectroscopy. From the width of fi rst sharp diffraction peak (FSDP), the correlation length (R-c) was calcula ted. While R-c changes with concentration of the CuI content, the position of the FSDP is nearly independent on concentration. The slope of the absorp tion edge and the transmission in near IR region changes drastically with a ddition of CuI to glassy As2Se3. The Raman spectra of the glasses show only vibrational modes of the AsSe3 pyramids. Results support a model in which the network of glassy As2Se3 is destroyed by chemically non-reacting CuI-mo lecules, (C) 1999 Published by Elsevier Science Ltd. All rights reserved.