Add time:08/06/2019 Source:sciencedirect.com
Cluster modelling based on ab-initio calculations testifies lack of intermediate optimally-constrained phase in binary GexSe100-x system within expected reversibility window (20 ≤ × < 26) in terms of global connectivity. Network of these glasses within 20 ≤ × < 26 compositional range can be composed of over-constrained “outrigger raft” structural motives built of two edge- and four corner-shared GeSe4/2 tetrahedra interconnected via optimally-constrained ≡ Ge―Se―Se―Ge≡ bridges, extra Se atoms forming ring-like configurations instead of Se―Se dimers.
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