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

doi:10.1016/j.jpcs.2006.05.018

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

Molecular Sciences, School of (SMS)

Research output: Contribution to journal › Article › peer-review

12 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 language	English (US)
Pages (from-to)	2106-2110
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	67
Issue number	9-10
DOIs	https://doi.org/10.1016/j.jpcs.2006.05.018
State	Published - 2006

Keywords

A. Glasses
C. Raman spectroscopy

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.jpcs.2006.05.018

Cite this

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title = "The structure of permanently densified CaAl2O4 glass",

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 {\AA} appears to largely recover upon decompression, leaving the local Ca-Ca and Ca-Al interactions significantly altered.",

keywords = "A. Glasses, C. Raman spectroscopy",

author = "Q. Mei and Benmore, {C. J.} and S. Sampath and Weber, {J. K R} and Kurt Leinenweber and S. Amin and Paul Johnston and Jeffery Yarger",

note = "Funding Information: We thank Ms. Kirsten Hiera for help with synthesis of the glass under NASA Contract No. NAS8-00125. This work was also supported by the US Department of Energy (W-31-109-ENG-38), the Department of Defense (ARO-190310143) and the National Science Foundation (CHE-0094202 and CHE-0313661). ",

year = "2006",

doi = "10.1016/j.jpcs.2006.05.018",

language = "English (US)",

volume = "67",

pages = "2106--2110",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

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TY - JOUR

T1 - The structure of permanently densified CaAl2O4 glass

AU - Mei, Q.

AU - Benmore, C. J.

AU - Sampath, S.

AU - Weber, J. K R

AU - Leinenweber, Kurt

AU - Amin, S.

AU - Johnston, Paul

AU - Yarger, Jeffery

N1 - Funding Information: We thank Ms. Kirsten Hiera for help with synthesis of the glass under NASA Contract No. NAS8-00125. This work was also supported by the US Department of Energy (W-31-109-ENG-38), the Department of Defense (ARO-190310143) and the National Science Foundation (CHE-0094202 and CHE-0313661).

PY - 2006

Y1 - 2006

N2 - 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.

AB - 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.

KW - A. Glasses

KW - C. Raman spectroscopy

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