Physics and Chemistry of Minerals

, Volume 26, Issue 6, pp 432–436

A Raman spectroscopic study of shock-wave densification of anorthite (CaAl2Si2O8) glass

  • B. Reynard
  • M. Okuno
  • Y. Shimada
  • Y. Syono
  • C. Willaime
ORIGINAL PAPER

Abstract

Structural modifications induced by shock-wave compression up to 40 GPa in anorthite glass are investigated by Raman spectroscopy. In the first investigation, densification increases with increasing shock pressure. A maximum densification of 2.2% is obtained for a shock pressure of 24 GPa. This densification is attributed to a decrease of the average ring size, favoring three-membered rings. The densification is much lower than in silica glass subject to shock at similar pressures (11%), because the T-O-T bond angle decrease is impeded in anorthite glass. For higher shock pressures, the decrease of the recovered densification is attributed to partial annealing of the samples due to high after-shock residual temperatures. The study of the annealing process of the most densified glass by in-situ high temperature Raman spectroscopy confirms that relaxation of the three-membered rings occurs above about 900 K.

Keywords anorthite glass shock compression densified glass Raman spectroscopy 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • B. Reynard
    • 1
  • M. Okuno
    • 2
  • Y. Shimada
    • 2
  • Y. Syono
    • 3
  • C. Willaime
    • 1
  1. 1.Géosciences Rennes CNRS UPR 4661, Université de Rennes1, F. 35042 Rennes Cedex, France E-mail: breynard@ens-lyon.frFR
  2. 2.Department of Earth Sciences, Faculty of Science, Kanazawa University, Kanazawa, 920-1192, JapanJP
  3. 3.Institute for Material Research, Tohoku University, Sendai, 980, JapanJP

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