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Equation of state of hercynite, FeAl2O4, and high-pressure systematics of Mg-Fe-Cr-Al spinels

Published online by Cambridge University Press:  02 January 2018

F. Nestola ,
B. Periotto ,
C. Anzolini ,
G. B. Andreozzi ,
A. B. Woodland ,
D. Lenaz ,
M. Alvaro  and
F. Princivalle
F. Nestola*
Affiliation:
Dipartimento di Geoscienze, Università degli Studi di Padova, Via Gradenigo 6, I-35131 Padova, Italy
B. Periotto
Affiliation:
Dipartimento di Geoscienze, Università degli Studi di Padova, Via Gradenigo 6, I-35131 Padova, Italy
C. Anzolini
Affiliation:
Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy
G. B. Andreozzi
Affiliation:
Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy
A. B. Woodland
Affiliation:
Institut für Geowissenschaften, Geozentrum der Goethe-Universität, Altenhöferallee 1, D-60438, Frankfurt am Main, Germany
D. Lenaz
Affiliation:
Dipartimento di Matematica e Geoscienze, Università degli Studi di Trieste, Via Weiss 8, I-34127 Trieste, Italy
M. Alvaro
Affiliation:
Dipartimento di Geoscienze, Università degli Studi di Padova, Via Gradenigo 6, I-35131 Padova, Italy
F. Princivalle
Affiliation:
Dipartimento di Matematica e Geoscienze, Università degli Studi di Trieste, Via Weiss 8, I-34127 Trieste, Italy
*
*E-mail: fabrizio.nestola@unipd.it
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Abstract

In this work a single crystal of synthetic hercynite, FeAl2O4, was investigated by X-ray diffraction up to 7.5 GPa and at room temperature, in order to determine its pressure–volume equation of state. The unit-cell volume decreases non-linearly with a reduction of 3.4% (i.e. 18.43 Å3). The pressure–volume data were fitted to a third-order Birch-Murnaghan equation of state providing the following coefficients: V0 = 542.58(3)Å3, KT0 = 193.9(1.7) GPa, K' = 6.0(5). These results are consistent with previous investigations of Cr and Al spinels measured with the same experimental approach but the KT0 differs significantly from the experimental determination carried out more than 40 years ago by Wang and Simmons (1972) by the pulse echo overlap method. Our new results were used to redetermine the FeAl2O4(hercynite) = FeO(wüstite) + Al2O3(corundum) equilibrium in P–T space and obtain geobarometric information for Cr-Al spinels found as inclusions in diamond.

Keywords

hercyniteX-ray diffractionhigh pressurebulk modulusdiamondspinel
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 2 , April 2015 , pp. 285 - 294
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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