MEDIUM-RANGE ORDER IN AS2S3-CUI GLASSES

X-ray diffraction data have been obtained for glasses in the system As 2S3-CuI. The first sharp diffraction peak (FSDP) appears at similar to 13 nm(-1) and is a signature of medium-range order. The correlation l ength of the glassy structure is estimated from the width of the FSDP for samples with different concentration of CuI. It is shown that R-c changes from 1.6 nm to 0.6 nm with increasing concentration of CuI fro m 0 to 20 mol%. (C) 1998 Elsevier Science B.V.