Raman thresholds and rigid to floppy transitions in calcium silicate glasses

Details Raman thresholds and rigid to floppy transitions in calcium silicate glasses Raman thresholds and rigid to floppy transitions in calcium silicate glasses

2004-10-29

arxiv.org/abs/cond-mat/0410770v1

Physics

Condensed Matter

Materials Science

11 pages, 12 figures

Scientific paper

Alkaline earth silicate glasses $xCaO-(1-x)SiO_2$ 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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