Effect of copper on the local structure of GeSe2Cux probed by Raman spectroscopy

Mary M.J. Tecklenburg, Elisabeth Larsen, Bogdan Lita, Didarul Islam Qadir

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Glassy GeSe2 is known to exhibit photodarkening that is extinguished by the presence of copper. Bulk glasses of GeSe2Cu x (0<x<0.16), prepared by melt-quenching, were studied by Raman spectroscopy to ascertain the effect of copper on the local structure of the glass. Decreases were observed in relative areas of the A1c (218 cm-1) and Ge-Ge (178 cm-1) peaks relative to the A 1 (201 cm-1) for compositions of less than x=0.05 copper but changed very little at higher compositions. The position of the A 1 and A1c peaks decreased by 2 cm-1 in low copper compositions. The density of the samples also increased sharply below x=0.05 and more gradually above x=0.05. The copper is seen as affecting the defects (Ge-Ge bonds) in the stoichiometric germanium-selenium glass but not affecting the tetrahedral Ge(Se1/2)4 chains.

Original languageEnglish
Pages (from-to)40-47
Number of pages8
JournalJournal of Non-Crystalline Solids
Issue number1-3
StatePublished - Oct 15 2003


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