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European Journal of Mineralogy; May, June 2003; v. 15; no. 3; p. 469-473; DOI: 10.1127/0935-1221/2003/0015-0469
© 2003 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Thermal expansion of natural orthoenstatite to 1473 K

Jennifer M. JACKSON1,*, James W. PALKO2, Denis ANDRAULT3, Stanislav V. SINOGEIKIN1, Dmitry L. LAKSHTANOV1, Jingyun WANG1, Jay D. BASS1 and Chang-Sheng ZHA4

1 Department of Geology, University of Illinois, Urbana, IL 61801, U.S.A.
2 Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801, U.S.A.
3 Laboratoire des Géomatériaux, Institut de Physique du Globe de Paris, 4 place Jussieu, F-75252 Paris Cedex 05, France
4 Cornell High Energy Synchrotron Source (CHESS), Cornell University, Ithaca, NY 14853, U.S.A.

* Corresponding author, e-mail: jmjackso{at}uiuc.edu

The volume thermal expansion of powdered natural orthoenstatite [(Mg0.994Fe0.002Al0.004)2(Si0.996Al0.004)2O6] has been measured to 1473 K using energy dispersive synchrotron X-ray diffraction. Over the temperature range examined, the data are consistent with a volume thermal expansion, {alpha}, that linearly increases with temperature as given by the expression {alpha}(T) = 29.7(16) x 10–6K–1 + 5.7(11) x 10–9K–2T. An analysis in terms of the often-used constant expansion coefficient yields {alpha}0 = 34.5(17) x 10–6 K–1, which is in good agreement with several previous experimental results on orthoenstatite (Mg2Si2O6) over a similar temperature range. Our results do not support the extreme upper and lower bounds reported in earlier studies for the thermal expansivity of Fe-rich orthoenstatite, but rather suggest that the thermal expansion of this phase is approximately midway between those extreme values.

Key-words: orthoenstatite, thermal expansion, high-temperature, X-ray diffraction.




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