The first sharp diffraction peak (FSDP) in the structure factor of covalent glasses and liquids is ascribed to a chemical-order pre-peak in the partial structure factor, SCC(Q), associated with the ordering of interstitial voids around cation-centred clusters in the structure. The deposition of the FSDP of AX2-type glasses can be predicted quantitatively. The anomalous behaviour of the FSDP as a function of temperature, pressure and modifier-ion content can all be understood in this interpretation. © 1992.
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