Abstract
Anomalous wide angle X-ray scattering (AWAXS) is used to investigate the short and medium range order in Sr silicate and Sr aluminosilicate glasses. Strong SrSr correlations at 4 Å are found in the silicate glass, whereas they are much weaker in the presence of aluminium. The first SrO distance and coordination number and further SrSr distances in the silicate glass are consistent with edge sharing octahedra. The SrAl correlations cannot be exactly determined, but the role of charge compensator imposed on the Sr by tetrahedral Al3+ rapidly reduces the order found in the silicate glass.
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