Abstract
The nearest-neighbor coordination environments of Te atoms in Ge x Te 100− x glasses with x = 15 and 20 and in As x Te 100− x glasses with 40 ⩽ x ⩽ 65 have been studied with Te K-edge EXAFS spectroscopy. The average coordination number of Te atoms in all glasses is found to be ∼2.0 and no violation of the 8-N rule is observed. The compositional makeup of the first coordination shell of Te atoms indicates that chemical order is largely preserved in both glass-forming binary systems. Sudden changes in the Te coordination environment and violation of chemical order are observed at the stoichiometric As 40Te 60 glass implying formation of a constrained network. The compositional dependence of the physical properties in both systems can be correlated to short-range chemical order.
Published Version
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