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The short-range order in vitreous Ge1−xSex(2/3≤x≤1) at 80 K was studied by EXAFS spectroscopy at the Ge and Se K-edges. The results were analyzed using theoretical phase shift and amplitude functions and by comparison to crystalline GeSe2 and Se as model compounds. The GeSe4 tetrahedron is the main structural entity for all the Ge–Se alloys. The results indicate a slight increase in Ge coordination...
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