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Thermal expansion of natural orthoenstatite to 1473 K

Jackson, Jennifer M. and Palko, James W. and Andrault, Denis and Sinogeikin, Stanislav V. and Lakshtanov, Dmitry L. and Wang, Jingyun and Bass, Jay D. and Zha, Chang-Sheng (2003) Thermal expansion of natural orthoenstatite to 1473 K. European Journal of Mineralogy, 15 (3). pp. 469-473. ISSN 0935-1221. doi:10.1127/0935-1221/2003/0015-0469.

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The volume thermal expansion of powdered natural orthoenstatite [(Mg_(0.994)Fe_(0.002)Al_(0.004))2(Si_(0.996)Al_(0.004))_2O_6] 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, α, that linearly increases with temperature as given by the expression α(T) = 29.7(16) × 10^(−6)K^(−1) + 5.7(11) × 10^(−9)K^(−2)T. An analysis in terms of the often-used constant expansion coefficient yields α_0 = 34.5(17) × 10^(−6) K^(−1), which is in good agreement with several previous experimental results on orthoenstatite (Mg_2Si_2O_6) 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.

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Jackson, Jennifer M.0000-0002-8256-6336
Additional Information:© 2003 E. Schweizerbart’sche Verlagsbuchhandlung, D-70176 Stuttgart. Received 27 June 2002. Modified version received 18 November 2002. Accepted 22 January 2003. The authors would like to thank George Rossman (California Institute of Technology) for providing the orthoenstatite samples (GRR 649, AMNH 100634) and Ian Steele (University of Chicago) for providing assistance with the microprobe analysis. We thank Ross Angel, Alison Pawley, and an anonymous reviewer for comments on the manuscript, and Ross Angel, Raymond Jeanloz, Robert Finch, Donald Lindsley, George Harlow, and Jason Nicholas for helpful discussions.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
Subject Keywords:orthoenstatite, thermal expansion, high-temperature, X-ray diffraction
Issue or Number:3
Record Number:CaltechAUTHORS:20140226-144020408
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Official Citation: Jennifer M. JACKSON, James W. PALKO, Denis ANDRAULT, Stanislav V. SINOGEIKIN, Dmitry L. LAKSHTANOV, Jingyun WANG, Jay D. BASS, and Chang-Sheng ZHA Thermal expansion of natural orthoenstatite to 1473 K Eur J Mineral, May, June 2003, v. 15, p. 469-473, doi:10.1127/0935-1221/2003/0015-0469
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44023
Deposited By: Ruth Sustaita
Deposited On:26 Feb 2014 23:37
Last Modified:10 Nov 2021 16:46

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