Abstract
Silica, silicate, borosilicate and heavy metal fluoride glasses were fractured under UHV conditions. The fracture mirror surfaces then were imaged by atomic force microscopy. The atomically resolved images display a fully interconnected random network arrangement for the silica glass, modified random network geometries with percolation paths for the silicate glasses, a structure with higher connectivity with some short percolation paths only for the borosilicate glass and a strongly interconnected structure for the heavy metal fluoride glass, probably with some chain- and ring-like geometric elements. Sodium diffusion, which is supposed to follow mainly these percolation paths, is qualitatively in line with the number, length and width of these paths.
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