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The structure of SiOz-Alz03 glasses with up to 60 wt % AIzO3 was investigated using the radial distribution function together with the correlation method based on X-ray scattering intensity data. Radial distribution curves are interpreted on the basis of glass-in-glass separation with the constituents of SiOz-rich and AIzO3-rich glasses. The structure of the AlzOa-rich glass has a short-range ordering similar to the crystal structure of mullite. The calculated S i ( S ) curve of this model gives good agreement with the observed one.

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