A Structural Study on Agl-Ag20-Cr03 Glass

A structural investigation for a 50AgI-20Ag20-30Cr03 (in mole %) glass has been carried out by using X-ray diffraction (XRD) and the extended X-ray absorption fine structure (EXAFS) techniques. The analysis of the EXAFS spectrum of the glass at the Ag K-edge reveals that the distance between a silver (I) and an iodide ions,o rAg-u and the average number of iodide ions around an Ag+, nAgA, are 2.874(4) A and 1.6(1), respectively. Two Ag-O distances separated by only 0.38 A (A rAgA) are deconvolved from the total Ag-O peak in the spectrum. The results by the X-ray diffraction measurement coincide with those by the EXAFS study within experimental uncertainties: rAg_r=2.860(l) A, nAg-i= 1.34(1), and A=0.35 A. The intramolecular structural parameters of Cr03 are determined to be rCl.0= 1.718 A, and Cr-0=5.58. Short range ordering of atoms is discussed on the basis of the radial distribution function (RDF). © 1993, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.