Ordering of water in opals with different microstructures

Jürgen Eckert, Olivier Gourdon, Dorrit E. Jacob, Cagla Meral, Paulo J.M. Monteiro, Sven C. Vogel, Richard Wirth, Hans Rudolf Wenk

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Opal has long fascinated scientists. It is one of the few minerals with an amorphous structure, and yet, compared to silica glass, it is highly organized on the mesoscale. By means of inelastic neutron scattering (INS), we could document that in four samples of opal at low temperature an ice-like structure of water is present, with details depending on microstructural characteristics. While FTIR spectra for all samples are nearly identical and thus not very informative, INS shows clear differences, highlighting the significance of microstructures. Neutron diffraction at 100 K on one of the opal samples provides evidence for crystalline cubic ice.

Original languageEnglish
Pages (from-to)203-213
Number of pages11
JournalEuropean Journal of Mineralogy
Volume27
Issue number2
DOIs
StatePublished - Mar 1 2015

Keywords

  • FTIR
  • Inelastic neutron scattering
  • Neutron diffraction
  • Opal
  • TEM
  • Water

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    Eckert, J., Gourdon, O., Jacob, D. E., Meral, C., Monteiro, P. J. M., Vogel, S. C., Wirth, R., & Wenk, H. R. (2015). Ordering of water in opals with different microstructures. European Journal of Mineralogy, 27(2), 203-213. https://doi.org/10.1127/ejm/2015/0027-2428