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

doi:10.1127/ejm/2015/0027-2428

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

Chemistry and Biochemistry

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

23 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 language	English
Pages (from-to)	203-213
Number of pages	11
Journal	European Journal of Mineralogy
Volume	27
Issue number	2
DOIs	https://doi.org/10.1127/ejm/2015/0027-2428
State	Published - Mar 1 2015

Keywords

FTIR
Inelastic neutron scattering
Neutron diffraction
Opal
TEM
Water

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10.1127/ejm/2015/0027-2428

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title = "Ordering of water in opals with different microstructures",

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 = "FTIR, Inelastic neutron scattering, Neutron diffraction, Opal, TEM, Water",

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AU - Eckert, Jürgen

AU - Gourdon, Olivier

AU - Jacob, Dorrit E.

AU - Meral, Cagla

AU - Monteiro, Paulo J.M.

AU - Vogel, Sven C.

AU - Wirth, Richard

AU - Wenk, Hans Rudolf

PY - 2015/3/1

Y1 - 2015/3/1

N2 - 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.

AB - 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.

KW - FTIR

KW - Inelastic neutron scattering

KW - Neutron diffraction

KW - Opal

KW - TEM

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ER -

Ordering of water in opals with different microstructures

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