Change in the topology of the glass forming liquid Gese2 with increasing temperature

Ingrid Petri, Philip S. Salmon, W. Spencer Howells

Research output: Contribution to journalConference article

33 Citations (Scopus)

Abstract

The change in topology with increasing temperature of liquid GeSe2 was studied by using neutron diffraction to measure the Bhatia-Thornton number-number partial structure factor, SNN (Q). where Q is the scattering vector. As the temperature is raised from 800 to 1100 °C there is a broadening but little other change in the peaks describing the local coordination environment. There is, however, a collapse of the intermediate range atomic ordering of the network associated with the Ge-Ge correlations as manifest by a substantial reduction in the height of the first sharp diffraction peak and a shift in its position from 0.99(1) to 1.05(1) Å-1. The changes in the structure with increasing temperature mimic those observed as the composition of liquid GeSe2 is changed to the GeSe stoichiometry by the addition of germanium. The significance of the results for recent Car-Parinello type ab-initio molecular dynamics simulations is briefly discussed.

Original languageEnglish
Pages (from-to)10219-10227
Number of pages9
JournalJournal of Physics Condensed Matter
Volume11
Issue number50
DOIs
Publication statusPublished - 20 Dec 1999
EventProceedings of the CECAM Workshop on Effective Interactions and Phase Transitions in Colloidal Suspensions - Lyon, France
Duration: 28 Jun 199930 Jun 1999

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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