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American Mineralogist

Journal of Earth and Planetary Materials

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


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

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

Online
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1945-3027
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Volume 88, Issue 10

Issues

Compressibility of phase Egg AlSiO3OH: Equation of state and role of water at high pressure

Carine B. Vanpeteghem
  • Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Sendai 980-8578, Japan
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/ Eiji Ohtani
  • Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Sendai 980-8578, Japan
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/ Tadashi Kondo
  • Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Sendai 980-8578, Japan
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/ Kenichi Takemura / Takumi Kikegawa
Published Online: 2015-03-31 | DOI: https://doi.org/10.2138/am-2003-1002

Abstract

We have determined the equation of state of phase Egg, AlSiO3OH, at room temperature up to 40 GPa, using X-ray powder diffraction with synchrotron radiation. We determined the isothermal bulk modulus K0T = 157 ± 4 GPa with a pressure derivative K'0T = 6.5 (4) by fitting a third order Birch- Murnaghan equation of state. When K'0T is fixed at 4, we obtain K0T = 183 ± 2 GPa. This value can be compared to other hydrous phases existing in the transition zone as well as to non-hydrous phases, such as kyanite, Al2SiO5. We find that despite the presence of hydrogen, the bulk modulus of phase Egg remains high, unlike other low-pressure hydrous minerals. In addition, we found that phase Egg is more compressible along the b axis, where the O-H bonds are oriented. Our results are in good agreement with previous theoretical calculations, performed on the similar hydrous phase δ-AlOOH, that show that the O-H bond strengthens with pressure, suggesting that the presence of water stored in these phases does not soften the material at pressures corresponding to lower mantle conditions.

About the article

Received: 2002-08-20

Accepted: 2003-03-24

Published Online: 2015-03-31

Published in Print: 2003-10-01


Citation Information: American Mineralogist, Volume 88, Issue 10, Pages 1408–1411, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2003-1002.

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© 2015 by Walter de Gruyter Berlin/Boston.

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