Intrinsic nanoscale phase separation of bulk As2S3 glass

D. G. Georgiev, P. Boolchand, K. A. Jackson

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Raman scattering on bulk AsxS1-x, glasses shows that vibrational modes of As4S4 monomer first appear near x = 0.38, and their concentration increases precipitously with increasing x, suggesting that the stoichiometric glass (x = 0.40) is intrinsically phase separated into small As-rich (As4S4) and large S-rich clusters. Support for the Raman-active vibrational modes of the orpiment-like and realgar-like nanophases is provided by ab-initio density functional theory calculations on appropriate clusters. Nanoscale phase separation provides a basis for understanding the global maximum in the glass transition temperature Tg near x = 0.40, and the departure from Arrhenius temperature activation of As2S3 melt viscosities.

Original languageEnglish
Pages (from-to)2941-2953
Number of pages13
JournalPhilosophical Magazine
Volume83
Issue number25
DOIs
StatePublished - Sep 1 2003

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