Raman thresholds and rigid to floppy transitions in calcium silicate glasses
M. Micoulaut, M. Malki, P. Simon, A. Canizares
Abstract
Alkaline earth silicate glasses xCaO-(1-x)SiO2 exhibit a well marked threshold in Raman lineshapes which can be related to the onset of network rigidity as the concentration of calcium oxide x is decreased. The present results are analyzed by constraint counting algorithms and more deeply characterized by a size increasing cluster approximation that allows to perform Maxwell mechanical constraint counting beyond the usual mean-field treatment. This permits to discuss under which structural conditions an elastic intermediate phase can be obtained.
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