Fig. 7: Visualization of alkali-oxygen polyhedra around non-bridging oxygen atoms in the alkali silicate glasses. | NPG Asia Materials

Fig. 7: Visualization of alkali-oxygen polyhedra around non-bridging oxygen atoms in the alkali silicate glasses.

From: Origin of the mixed alkali effect in silicate glass

Fig. 7

a Na100 glass, b Na50K50 glass, c K100 glass, and d typical bottle neck structures consist of Na-O and K-O polyhedra. Red; bridging oxygen (BO), cyan; non-bridging oxygen (NBO), yellow; Na, gray; K. Alkali-oxygen polyhedra with the formation of edge-sharing of NBO atoms are visualized. Typical K-O polyhedra with increased BO coordination are highlighted in black.

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