Structure of As-Se glasses by neutron diffraction with isotope substitution

Annalisa Polidori, Anita Zeidler, Philip Salmon

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Abstract

The method of neutron diffraction with selenium isotope substitution is used to measure the structure of glassy As0.30Se0.70, As0.35Se0.65 and As0.40Se0.60. The method delivers three difference functions for each sample in which either the As-As, As-Se or Se-Se correlations are eliminated. The measured coordination numbers are consistent with the "8-N" rule and show that the As0.30Se0.70
network is chemically ordered, a composition near to which there is a minimum in the fragility index and a boundary to the intermediate phase. Chemical ordering in glassy As0.35Se0.65 and As0.40Se0.60 is, however, broken by the appearance of As-As bonds, the fraction of which increases with the arsenic content of the glass. For the As0.40Se0.60 material, a substantial fraction of As-As and Se-Se defect pairs (~11%) is frozen into the network structure on glass formation.
Original languageEnglish
Article number154507
Number of pages18
JournalJournal of Chemical Physics
Volume153
Issue number15
Early online date19 Oct 2020
DOIs
Publication statusPublished - 19 Oct 2020

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