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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
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0003-004X
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Volume 88, Issue 10

Issues

Pressure-controlled polytypism in hydrous layered materials

Przemyslaw Dera
  • Corresponding author
  • Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, D.C. 20015, U.S.A.
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/ Charles T. Prewitt
  • Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, D.C. 20015, U.S.A.
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/ Stefanie Japel
  • Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, D.C. 20015, U.S.A.
  • Department of Earth and Planetary Sciences, Johns Hopkins University, Olin Hall, 3400 North Charles Street, Baltimore, Maryland 21218, U.S.A.
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/ David L. Bish
  • Geology and Geochemistry, MS D469, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.
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/ Cliff T. Johnston
  • Birck Nanotechnology Center, 915 W. State Street, Purdue University, West Lafayette, Indiana 47907-2054, U.S.A.
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Published Online: 2015-03-31 | DOI: https://doi.org/10.2138/am-2003-1006

Abstract

An isosymmetric displacive structural transformation in the hydrous layer silicate dickite [Al2Si2O5(OH)4, monoclinic Cc, a = 5.161(3), b = 8.960(6), c = 14.459(10) Å, β = 96.77(1)°], occurring under hydrostatic compression above 2.0 GPa, has been studied using single-crystal X-ray diffraction and diamond-anvil cell techniques. The structure of the high-pressure phase, determined in situ, is monoclinic with space group Cc with unit-cell parameters a = 5.082(3), b = 8.757(6), c = 13.771(9) Å, and β = 89.60(2)° at 4.1 GPa. The positions of all hydrogen atoms at both ambient and high pressure have been determined by a combination of simulated annealing and energy minimization. The mechanism of the transformation, which may be general for other hydrous layered materials, involves a shift of the 1:1 layers with respect to each other by the vector [1/6, 1/6, 0] and is accompanied by the formation of new hydrogen bonds.

About the article

Received: 2002-08-23

Accepted: 2003-04-13

Published Online: 2015-03-31

Published in Print: 2003-10-01


Citation Information: American Mineralogist, Volume 88, Issue 10, Pages 1428–1435, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2003-1006.

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© 2015 by Walter de Gruyter Berlin/Boston.

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