The structure of densified As2O3 glasses

Q. Mei, R. T. Hart, C. J. Benmore, S. Amin, Kurt Leinenweber, Jeffery Yarger

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In situ high energy X-ray diffraction and Raman experiments have been carried out to probe the structure changes of vitreous As2O3 under pressure. The first sharp diffraction peak reduces in intensity up to 10 GPa, indicating a breakdown of intermediate range order with pressure. All features in the Raman spectra broaden with increasing pressure up to 11.6 GPa. The mode at 378 cm-1 associated with As4O6 molecule-like vibrations increases in intensity up to 6.2 GPa and decreases at higher pressures. In addition, X-ray and neutron structure factors have been measured for normal density and permanently densified As2O3 glasses recovered from 10 and 23 GPa. The results show the local AsO3 pyramids and 3-membered rings essentially remain intact after compression. The increase in density is mainly associated with an inward shift of the third nearest neighbor peak in the X-ray radial distribution function, which indicates an increased packing of 3-membered AsO3 rings.

Original languageEnglish (US)
Pages (from-to)1755-1758
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume353
Issue number18-21
DOIs
StatePublished - Jun 15 2007

Fingerprint

Glass
glass
x rays
rings
pyramids
diffraction
radial distribution
X rays
breakdown
distribution functions
Raman spectra
Distribution functions
Raman scattering
neutrons
vibration
Neutrons
probes
Diffraction
shift
X ray diffraction

Keywords

  • Medium-range order
  • Natural glasses
  • Neutron diffraction/scattering
  • Pressure effects
  • Raman scattering
  • Synchrotron radiation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

The structure of densified As2O3 glasses. / Mei, Q.; Hart, R. T.; Benmore, C. J.; Amin, S.; Leinenweber, Kurt; Yarger, Jeffery.

In: Journal of Non-Crystalline Solids, Vol. 353, No. 18-21, 15.06.2007, p. 1755-1758.

Research output: Contribution to journalArticle

Mei, Q. ; Hart, R. T. ; Benmore, C. J. ; Amin, S. ; Leinenweber, Kurt ; Yarger, Jeffery. / The structure of densified As2O3 glasses. In: Journal of Non-Crystalline Solids. 2007 ; Vol. 353, No. 18-21. pp. 1755-1758.
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