Frontiers of self-organization in covalent-bonded glassy networks: A complexity originates from mixed molecular-clustering and chain-crossing in glassy germanoselenides Ge-Se

摘要

Compositional trends in topological organization of fully-saturated covalent networks are considered at the example of binary Ge-Se glasses. It is shown that previously announced reversibility window, detected in this system with temperaturemodulated differential scanning calorimetry as compositional range of under-marginal non-reversing heat flow, does not correspond to real intermediate phase in terms of global optimally-constrained connectivity. The observed structural complexity is attributed to topological pseudo-self- organization, e.g. effect originated from mixed over-constrained molecular-clustering and optimally-constrained inter-cluster chain crossing.