Coordination of Ag+ ions in AgI–Ag2O–B2O3 glasses by x-ray diffraction

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Abstract
X‐ray diffraction measurements have been performed on glasses of the Ag2O–B2O3 and AgI–Ag2O–B2O3 systems. When silver iodide is present, the radial distribution function is dominated by a large peak at 2.85 Å, due to Ag–I interactions, with a shoulder at ∼2.40 Å, due to Ag–O pairs. The average number of Ag–I contacts has been calculated through analysis of the high angle structure functions s i(s)’s, either by using the total s i(s)’s or by using the partial s i(s)’s, the latter obtained by subtracting the experimental structure function of the Ag2O–B2O3glasses from that of the corresponding AgI‐doped glasses. The compatibility of the results obtained with recently proposed models of AgI–Ag2O–B2O3glasses is examined.