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High-pressure crystal structure investigation of synthetic Fe2SiO4 spinel

Published online by Cambridge University Press:  05 July 2018

F. Nestola ,
T. Balić-Žunić ,
M. Koch-Müller ,
L. Secco ,
F. Princivalle ,
F. Parisi  and
A. Dal Negro
F. Nestola*
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy C.N.R.-IGG-UO Padova, Via Gradenigo 6, I-35131, Padova, Italy
T. Balić-Žunić
Affiliation:
Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen, Denmark
M. Koch-Müller
Affiliation:
Helmholtz-Zentrum Potsdam, GFZ, Telegrafenberg, D-14473 Potsdam, Germany
L. Secco
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
F. Princivalle
Affiliation:
Dipartimento di Geoscienze, Università di Trieste, via E. Weiss, 8 I-34127, Trieste, Italy
F. Parisi
Affiliation:
Dipartimento di Geoscienze, Università di Trieste, via E. Weiss, 8 I-34127, Trieste, Italy
A. Dal Negro
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
*
*E-mail: [email protected]
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Abstract

The crystal structure of Fe2SiO4 spinel at room temperature was investigated at seven different pressures by X-ray diffraction, using a diamond anvil cell to examine the influence of Fe substitution on ringwoodite behaviour at high pressure. The results compared with those of a pure Mg endmember show that the substitution of Fe into the spinel structure causes only small changes in the compression rate of coordination polyhedra and the distortion of the octahedron. The data show that the compression rate for the octahedron and tetrahedron in (Mg,Fe)2SiO4 can be considered statistically equal for FeO6 and MgO6, as well as for SiO4 in both the endmembers. This shows why almost identical bulk moduli are reported along the solid solution in recent literature.

Keywords

high pressureX-ray diffractionsingle crystalsynthetic Fe2SiO4spinel
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 5 , October 2011 , pp. 2649 - 2655
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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