Equation of state of Fe3+-bearing phase-X

We investigated the high-pressure behaviour of Fe 3+ -bearing hydrous phase-X, (K 1.307 Na 0.015 )(Mg 1.504 Fe 0.373 3+ Al 0.053 Ti 0.004 4+ )Si 2 O 7 H 0.36 , up to 34 GPa at room temperature by synchrotron X-ray powder diffraction. The lattice parameters behave anisotropically, with the [001] dire...

Full description

Saved in:
Bibliographic Details
Published in:Physics and chemistry of minerals 2012-07, Vol.39 (7), p.553-559
Main Authors: Nazzareni, S., Comodi, P., Bindi, L., Garbarino, G., Bobrov, A.
Format: Article
Language:English
Subjects:
Anisotropy
Bearing
Bulk modulus
Crystallography and Scattering Methods
Crystals
Earth and Environmental Science
Earth Sciences
Equations of state
Geochemistry
Lattice parameters
Mineral Resources
Mineralogy
Original Paper
Structural stability
Synchrotron radiation
X ray powder diffraction
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigated the high-pressure behaviour of Fe 3+ -bearing hydrous phase-X, (K 1.307 Na 0.015 )(Mg 1.504 Fe 0.373 3+ Al 0.053 Ti 0.004 4+ )Si 2 O 7 H 0.36 , up to 34 GPa at room temperature by synchrotron X-ray powder diffraction. The lattice parameters behave anisotropically, with the [001] direction stiffer than [100]. In the 10 −4 to 22 GPa pressure range, the axial bulk moduli are K 0 a  = 112(3) GPa and K ′ = 4, and K 0 c  = 158(2) GPa and K ′ = 4, and the anisotropy of the lattice parameters is β 0 c :β 0 a  = 0.71:1. The cell volumes are fitted by a second-order Birch–Murnaghan equation of state giving a bulk modulus of K 0  = 127(1) GPa and K ′ = 4 in the same pressure range. After 22 GPa, a discontinuity in volume and lattice parameters can be recognized. Sample did not become amorphous up to 34 GPa. The coupled substitution K + Mg = [] + Fe 3+ has only a limited influence on the bulk modulus and structural stability of phase-X.
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-012-0511-2