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 Scopus citations

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 - Jan 1 2006

Keywords

  • A. Glasses
  • C. Raman spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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