Correlating structure with non-linear optical properties in xAs40Se60·(1 - X)As40S60 glasses

Emma R. Barney, Nabil S. Abdel-Moneim, James J. Towey, Jeremy Titman, John E. McCarthy, Henry T. Bookey, Ajoy Kar, David Furniss, Angela B. Seddon

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A series of xAs40Se60·(100 - x)As40S60 glasses, where x = 0, 25, 33, 50, 67, 75 and 100 mol% As40Se60, has been studied using neutron and X-ray total scattering, Raman spectroscopy and 77Se MAS-NMR. The results are presented with measurements of non-linear refractive indices, n2, and densities. There is no evidence for the formation of homopolar bonds in these glasses, but neutron correlation functions suggest that there is a non-random distribution of sulfur and selenium atoms in sulfur-rich glasses. The average number of sulfur atoms at a distance of 3-4 Å from a selenium atom, nSeS, deviates from a linear variation with x in glasses containing <50 mol% As40Se60; n2 for these glasses also varies non-linearly with x. Importantly, a direct comparison of n2 and nSeS gives a linear correlation, suggesting that n2 may be related to the distribution of chalcogen atoms in the glasses. This journal is

Original languageEnglish
Pages (from-to)6314-6327
Number of pages14
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number9
DOIs
Publication statusPublished - 7 Mar 2015

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