Infrared spectroscopy of AgI doped Ag2S+B2S3 fast ion conducting thioborate glasses

The infrared (IR) spectra of binary silver thioborate xAg(2)S + (1 - x)B2S3 glasses (0.3 less than or equal to x less than or equal to 0.56) and terna ry zAgI + (1 - z) [0.5Ag(2)S + 0.5B(2)S(3)] glasses (0 less than or equal t o z less than or equal to 0.3) are reported. The structure of the binary gl asses changes with an increase in modifier content as observed by a monoton ic decrease in the fraction of tetrahedrally coordinated boron units and an increase in the fraction of orthothioborate units. This reduction in four coordinated boron and increase in tri-coordinated orthothioborate boron uni ts has been seen in the alkali thioborates and analogous silver berate glas ses. The structure of the ternary glasses shows little to no change in the IR spectra with an increase in AgI (z) up to 30 mol%. This result agrees wi th previous studies performed on alkali thioborate and silver berate glasse s. (C) 2000 Elsevier Science B.V. All rights reserved.