Thermal expansion of natural orthoenstatite to 1473 K

Jennifer M. Jackson, James W. Palko, Denis Andrault, Stanislav V. Sinogeikin, Dmitry L. Lakshtanov, Jingyun Wang, Jay D. Bass, Chang Sheng Zha

Research output: Contribution to journalArticlepeer-review


The volume thermal expansion of powdered natural orthoenstatite [(Mg0.994Fe0.002Al0.004 2(Si0.996AAl0.004 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, α, that linearly increases with temperature as given by the expression α(T) = 29.7(16) × 10-6K-1 + 5.7(11) × 10-9 K-2T. An analysis in terms of the often-used constant expansion coefficient yields αo=34.5(17) × 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.

Original languageEnglish (US)
Pages (from-to)469-473
Number of pages5
JournalEuropean Journal of Mineralogy
Issue number3
StatePublished - 2003


  • High-temperature
  • Orthoenstatite
  • Thermal expansion
  • X-ray diffraction

ASJC Scopus subject areas

  • Geochemistry and Petrology


Dive into the research topics of 'Thermal expansion of natural orthoenstatite to 1473 K'. Together they form a unique fingerprint.

Cite this