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, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1599-1603
Number of pages5
JournalAmerican Mineralogist
Volume103
Issue number10
DOIs
StatePublished - Oct 25 2018
Externally publishedYes

Keywords

  • nano fayalite
  • Olivine-spinel transition
  • quartz-fayalite-magnetite (QFM) buffers
  • quartz-iron-fayalite (QIF) buffers
  • surface energy

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Fingerprint Dive into the research topics of 'Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition'. Together they form a unique fingerprint.

Cite this