Poisson'S Ratio And The Glass Network Topology - Relevance To High Pressure Densification And Indendation Behaviour

Although Poisson's ratio is a macroscopic elastic parameter it depends much on the fine details of the atomic packing. Glasses exhibit a wide range of values for { from 0.1 to 0.4 which correlate to the glass network polymerisation degree, hence reproducing at the atomic scale what is observed in cellular materials at the microscopic scale. As for pure oxide glasses, we found in various multi component glasses built in ionic-, covalent- or Van der Waals bonds that an increase of Poisson's ratio corresponds to a decrease of the atomic network crosslink degree. Note, an extension of this analysis to the case of metallic glasses correlate the recently proposed cluster-like network structure for 5 these glasses.