Original paper

Ordering of water in opals with different microstructures

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

European Journal of Mineralogy Volume 27 Number 2 (2015), p. 203 - 213

published: Mar 1, 2015

DOI: 10.1127/ejm/2015/0027-2428

BibTeX file

ArtNo. ESP147052702010, Price: 29.00 €

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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.

Keywords

inelastic neutron scatteringtemwaterneutron diffractionftiropal