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Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition

  • Kristina Lilova , Michael T. DeAngelis , Lawrence M. Anovitz and Alexandra Navrotsky
Published/Copyright: September 28, 2018
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Abstract

The surface energy (hydrated surfaces) of fayalite (α-Fe2SiO4) was determined to be 2.47 ± 0.25 J/m2 using high-temperature oxide melt solution calorimetry. This is larger than the surface energy of magnetite (Fe3O4), but lower than that of forsterite (α-Mg2SiO4). The changes in the positions of the quartz-fayalite-magnetite (QFM) and quartz-iron-fayalite (QIF) buffers with particle size reduction were calculated. QFM is lowered in fO2 by 3–7 log units as a function of temperature for 30 nm particles while QIF is raised by 1–2 log units. The estimated surface energy difference between olivine and spinel polymorphs decreases the pressure of the olivine-spinel transition in Fe2SiO4 by about 1 GPa.

Acknowledgments

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division (calorimetry at U.C. Davis was supported under Award number DE-FG02ER1474). Work by M.T.D. was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The authors thank D.H. Lindsley for careful synthesis of the bulk 5-15-17 fayalite sample.

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Received: 2018-02-28
Accepted: 2018-05-29
Published Online: 2018-09-28
Published in Print: 2018-10-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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