An anomalous X-ray scattering study on glassy superionic conductor (As2Se3)(1-x)(CuI)(x) using a third-generation synchrotron radiation facility

摘要

Anomalous X-ray scattering experiments on glassy superionic conductor (As2Se3)(0.4)(CuI)(0.6) were performed at energies close to the As, Se, and Cu K edges using a new detecting system and a third-generation synchrotron radiation facility. The detecting system was composed of a graphite-crystal energy-analyzer and a NaI(TI) detector on a 40-cm-long arm. The overall energy resolution was about 60 eV, which can discriminate the elastic signal from the fluorescence and Compton contributions, and a sufficient number of scattered X-ray photons were acquired within a reasonable data collection time. The differential structure factors, Delta(i)S(Q), were obtained from the detailed analyses, indicating that Delta(As)S(Q) and Delta(Se)S(Q) are similar to those of glassy As2Se3l except at the prepeak position, and Delta(Cu)S(Q) that in liquid CuI. From these findings, it can be concluded that a pseudo-binary mixture of the As2Se3 network matrix and CuI-related conduction pathways would be a good structural model for this superionic glass. (c) 2005 Elsevier B.V. All rights reserved.