The structure of permanently densified CaAl2O4 glass

Q. Mei, C. J. Benmore, S. Sampath, J. K R Weber, Kurt Leinenweber, S. Amin, Paul Johnston, Jeffery Yarger

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

High-energy X-ray diffraction experiments have been performed on CaAl2O4 glass pressure cycled to 12 GPa. A comparison of the radial distribution functions of ambient pressure glass and material that has been pressure cycled shows little change in the local Al-O and Ca-O correlations or nearest-neighbour Al-Al interactions. It is found that the main structural changes occur through a breakup of the chemical ordering of the Ca polyhedra. By comparison with the known crystal structure, this is interpreted as a consequence of the distortion and shrinking of holes in the Al network under pressure, in which the Ca ions reside. The Al framework up to ∼15 Å appears to largely recover upon decompression, leaving the local Ca-Ca and Ca-Al interactions significantly altered.

Original languageEnglish (US)
Pages (from-to)2106-2110
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume67
Issue number9-10
DOIs
StatePublished - Sep 2006

Fingerprint

Glass
glass
pressure reduction
polyhedrons
radial distribution
Distribution functions
Crystal structure
distribution functions
interactions
Ions
X ray diffraction
crystal structure
diffraction
ions
x rays
Experiments
energy

Keywords

  • A. Glasses
  • C. Raman spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

The structure of permanently densified CaAl2O4 glass. / Mei, Q.; Benmore, C. J.; Sampath, S.; Weber, J. K R; Leinenweber, Kurt; Amin, S.; Johnston, Paul; Yarger, Jeffery.

In: Journal of Physics and Chemistry of Solids, Vol. 67, No. 9-10, 09.2006, p. 2106-2110.

Research output: Contribution to journalArticle

Mei, Q, Benmore, CJ, Sampath, S, Weber, JKR, Leinenweber, K, Amin, S, Johnston, P & Yarger, J 2006, 'The structure of permanently densified CaAl2O4 glass', Journal of Physics and Chemistry of Solids, vol. 67, no. 9-10, pp. 2106-2110. https://doi.org/10.1016/j.jpcs.2006.05.018
Mei, Q. ; Benmore, C. J. ; Sampath, S. ; Weber, J. K R ; Leinenweber, Kurt ; Amin, S. ; Johnston, Paul ; Yarger, Jeffery. / The structure of permanently densified CaAl2O4 glass. In: Journal of Physics and Chemistry of Solids. 2006 ; Vol. 67, No. 9-10. pp. 2106-2110.
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