Figure 8
From: Boson peak, heterogeneity and intermediate-range order in binary SiO2-Al2O3 glasses

Variation of the dynamic correlation length ξ in silica and binary aluminosilicate glasses as a function of alumina content. The mean inter-particle distance D is shown in the upper inset, and the ratio ξ/D in the lower inset. The line is drawn to guide the eye.