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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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1945-3027
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Volume 92, Issue 10

Issues

Single-crystal structure refinement of diaspore at 50 GPa

Alexandra Friedrich
  • Corresponding author
  • Institut für Geowissenschaften, Abt. Kristallographie, J.W. Goethe-Universität Frankfurt, D-60438 Frankfurt am Main, Germany
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  • Other articles by this author:
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/ Eiken Haussühl
  • Institut für Geowissenschaften, Abt. Kristallographie, J.W. Goethe-Universität Frankfurt, D-60438 Frankfurt am Main, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Reinhard Boehler / Wolfgang Morgenroth / Erick A. Juarez-Arellano
  • Institut für Geowissenschaften, Abt. Kristallographie, J.W. Goethe-Universität Frankfurt, D-60438 Frankfurt am Main, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Björn Winkler
  • Institut für Geowissenschaften, Abt. Kristallographie, J.W. Goethe-Universität Frankfurt, D-60438 Frankfurt am Main, Germany
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  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2007.2549

Abstract

The crystal structure of diaspore, AlO(OH), has been investigated by in situ single-crystal synchrotron X-ray diffraction at ~50 GPa using the diamond-anvil cell technique. Diaspore is found to retain its structure up to 51.5 GPa at room temperature, which is more than 30 GPa above the transition pressure to δ-AlO(OH) found in quenched high-temperature experiments and derived from density functional theory calculations. The compression is anisotropic and largest for the a axis. This can be explained by the fact that the structural response to pressure is mainly due to the shortening of the hydrogen bond, which is oriented nearly parallel to the a axis. The hydrogen bond becomes significantly more symmetric with pressure up to 50 GPa.

Keywords: Diaspore; high pressure; crystal structure; synchrotron radiation; single crystal

About the article

Received: 2006-12-31

Accepted: 2007-05-24

Published Online: 2015-04-01

Published in Print: 2007-10-01


Citation Information: American Mineralogist, Volume 92, Issue 10, Pages 1640–1644, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2007.2549.

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