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Figure 1

From: Percolation channels: a universal idea to describe the atomic structure and dynamics of glasses and melts

Figure 1

Viscosity variations measured in compensated alumino-silicate glasses and CCRN Molecular Dynamics model of Na0.25K0.75AlSiO4 glass demonstrating nano-segregation of alkalis. (A) Diagram K2O-Na2O-Al2O3-SiO2 in mol % showing the studied compositions. X K  = K 2 O/(K 2 O + Na 2 O). Values and ratios are listed in Table S1. (B) Viscosity at constant temperature of the compensated glasses as a function of their X K ratios. See Tables S1, S2, S3 and Fig. S3 for chemical compositions and viscosity data; errors are smaller than symbols. (C) 12,096 atom MD model of the Na0.25K0.75AlSiO4 glass, illustrating nano-segregation of charge compensating alkalis in percolation pathways. The white frame compares the size of the 1512 atom melt ensembles used to determine the development of nanostructure and rheological properties shown in Figs 4, 5. (D) MD alkali-alkali partial pair distribution functions ρ(r) for the 12,096 atom glass, revealing ordering extending over three alkali coordination shells.

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