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American Mineralogist; October 2007; v. 92; no. 10; p. 1640-1644; DOI: 10.2138/am.2007.2549
© 2007 Mineralogical Society of America
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Single-crystal structure refinement of diaspore at 50 GPa

Alexandra Friedrich1,*, Eiken Haussühl1, Reinhard Boehler2, Wolfgang Morgenroth3, Erick A. Juarez-Arellano1 and Björn Winkler1

1 Institut für Geowissenschaften, Abt. Kristallographie, J.W. Goethe-Universität Frankfurt, D-60438 Frankfurt am Main, Germany
2 Max-Planck-Institut für Chemie, D-55020 Mainz, Germany
3 Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark

Correspondence: * E-mail: friedrich{at}kristall.uni-frankfurt.de

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 {delta}-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.

Key Words: Diaspore • high pressure • crystal structure • synchrotron radiation • single crystal




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Vibrational properties of {delta}-AlOOH under pressure
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