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High-temperature in situ Rietveld study of Fe,Mg cation partitioning in olivine

Published online by Cambridge University Press:  10 January 2013

G. Artioli ,
M. Bellotto  and
B. Palosz
G. Artioli
Affiliation:
Università di Milano, Dipartimento di Scienze della Terra, I-20133 Milano, Italy
M. Bellotto
Affiliation:
CISE Tecnobgie Innovative, I-20119 Segrate, Italy
B. Palosz
Affiliation:
High Pressure Research Center, P-01142 Warszawa, Poland
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Abstract

A natural olivine sample from a mantle peridotite xenolith has been studied by in situ high-temperature powder diffraction. The structure has been successfully refined from powder data at three temperatures (25, 600, and 800 °C) using the Rietveld method. The study shows that the full-profile technique is well suited for the structure analysis of high-temperature powder diffraction data. The results indicate that, in this temperature range, there is no significant ordering of the Fe,Mg cations in the two crystallographically independent octahedral sites. This has implications for the thermodynamic modeling of olivine at upper mantle conditions. The present experiments allowed measurement of the lattice thermal expansion of olivine in the temperature range 25–800 °C, and assessment of the temperature dependence of the isotropic atomic displacement parameters.

Type
Research Article
Information
Powder Diffraction , Volume 9 , Issue 1 , March 1994 , pp. 63 - 67
Copyright
Copyright © Cambridge University Press 1994

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