Abstract

The GeSe 3 and GeSe 5 binary glasses have been measured by anomalous wide angle X-ray scattering. The structure of g-GeSe 3 is found to be mainly based on that of the crystalline GeSe 2 compound with the presence of edge- and corner-sharing GeSe 4 tetrahedra. For g-GeSe 5, the glassy structure is built up from isolated GeSe 4 tetrahedra interconnected by short chains of chalcogen atoms in agreement with the ‘crossing chain model’. Finally, the ‘first sharp diffraction peak’, encountered on the total structure factors around 1 Å −1, seems to be due to Ge … Ge correlations in the intermediate range order (6–7 Å).

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