Abstract
129I Mössbauer spectra of g-GexSe1-x alloys display a local maximum in the site-intensity ratio IB/IA(x) at the critical composition x=xc=0.23±0.02. This observation is consistent with the realization of mechanical critical behavior in a covalent network glass recently predicted by Phillips and Thorpe. We identify xc with the onset of percolation of a specific molecular fragment based on the layered form of c-GeSe2.
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