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Equation of state of phase E

Published online by Cambridge University Press:  05 July 2018

W. A. Crichton  and
N. L. Ross
W. A. Crichton*
Affiliation:
Department of Geological Sciences, University College London, London WC1E 6BT, UK
N. L. Ross
Affiliation:
Department of Geological Sciences, University College London, London WC1E 6BT, UK
*
* E-mail: [email protected]
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Abstract

The isothermal equation of state (EoS) of phase E, Mg1.96(7)Fe0.072(5)Si1.04(5)H3.7(8)O6, has been determined using high-pressure single-crystal X-ray diffraction. A third-order Birch Murnaghan EoS fit to pressue-volume data collected from room pressure and temperature to 6.7 GPa reveals that phase E has the lowest bulk modulus, KT = 92.9(7) GPa, and highest pressure derivative of the bulk modulus, K' = 7.3(2), for any dense hydrous magnesium silicate (DHMS) yet measured. A parameterized third-order Birch-Murnaghan EoS was also fit to the unit-cell parameters which display significant curvature with increasing pressure. This analysis shows that the c-axis (Kc = 89.1(10) GPa) is 6% more compressible than the a-axis (Ka = 94.8(6) GPa), with little of the anisotropy commonly observed in other layered structures. The high K' is indicative of the similarity to layers of the brucite structure. The introduction of interlayer cation polyhedra to the structure serves to reduce both the anisotropy, by reducing the compressibility perpendicular to the sheets, and the ability to shear, by increasing the coherence between layers.

Keywords

X-ray diffractionhigh pressureequation of statephase E
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 3 , June 2000 , pp. 561 - 567
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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Footnotes

1

Present address: ID30, ESRF, 6 rue Jules Horowitz, BP220, 38043 Grenoble, France

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