Origin of the first sharp diffraction peak in the structure factor of disordered network-forming systems: Layers or voids?

The origin of the first sharp diffraction peak (FSDP) in the total structure factor of disordered network-forming glasses and liquids is frequently interpreted either as resulting from crystalline-like layers or from correlations between basic structural units (clusters) and interstitial voids. By applying appropriate criteria to configurations of liquid SiO2 and GeSe2 obtained by first-principles molecular dynamics, we find that neither interpretation holds. Despite the appearance of a FSDP in both liquids, there is no evidence for the occurrence of crystalline-like layers. By contrast, cluster-void correlations do not only occur for these liquids, but also for a model system in which the FSDP is absent. (C) 2001 American Institute of Physics.


Published in:
Journal of Chemical Physics, 114, 18, 7976-7979
Year:
2001
ISSN:
0021-9606
Other identifiers:
Laboratories:




 Record created 2009-10-08, last modified 2018-03-17


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