Second sharp diffraction peak in the structure factor of binary covalent network glasses.

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The second peak in the structure factor of ${\mathit{AX}}_{2}$-type glasses is found to behave in an anomalous fashion with respect to network-modifier content in a manner similar to that characteristic of the first sharp diffraction peak (FSDP). The structural origin of this newly identified second sharp diffraction peak is ascribed to interstitial-void ordering on a length scale different from that responsible for the FSDP.