Optical and X-ray absorption measurements on superionic (AgI) x(Ag 2On B 2O 3) 1−x glasses

Abstract

The glasses (AgI) x(Ag 2O n B 2O 3) 1−x have been studied by optical and X-ray absorption spectroscopy at various x and n concentrations. The optical absorption of the n=4 glasses shifts linearly at the increasing of the AgI content x. Extrapolating to x=1, the corresponding value for α-AgI is crossed. The comparison of the EXAFS structures at the I L 3 edge of the n=3, x=0.3 glass and of β-AgI seems to indicate that the Ag-I coordination is substantially unmodified in the glass with respect to that in β-AgI. A further comparison of the EXAFS at the Ag L 3 edge allows to discuss the coordination Ag-O in the glass.