Abstract
Atomic bonding structures in xGeO2–(100-x)GeS2 glasses have been studied through structural and chemical experiments. Atomic force microscope images in alkali-etched samples with x = 80 mol % show nano-scale dips, which are ascribable to isolated GeS2 clusters. Transmission electron microscope images and small angle X-ray scattering patterns suggest that the glass with x ≈50 has pronounced heterogeneous structures in nanoscales. Composition dependence of an etching rate exhibits a characteristic change at x = 60, which can be interpreted as a percolation threshold of tetrahedral GeS4 units. These results support a nanostructure model for the oxy-chalcogenide glass.
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