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

Abstract

The surface energy (hydrated surfaces) of fayalite ($α$-Fe 2SiO 4) was determined to be 2.47 ± 0.25 J/m 2 using high-temperature oxide melt solution calorimetry. This is larger than the surface energy of magnetite (Fe 3O 4), but lower than that of forsterite ($α$-Mg 2SiO 4). 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 $$f_{O_2}$$ 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 Fe 2SiO 4 by about 1 GPa.

Authors:
 [1];  [2]; ORCiD logo [3];  [1]
  1. Univ. of California, Davis, CA (United States). Peter A. Rock Thermochemistry Lab.
  2. Univ. of Arkansas at Little Rock, Little Rock, AR (United States). Dept. of Earth Sciences
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1567001
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
American Mineralogist
Additional Journal Information:
Journal Volume: 103; Journal Issue: 10; Journal ID: ISSN 0003-004X
Publisher:
Mineralogical Society of America
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Olivine-spinel transition; nano fayalite; quartz-fayalite-magnetite (QFM) buffers; quartz-iron-fayalite (QIF) buffers; surface energy

Citation Formats

Lilova, Kristina, Angelis, Michael, Anovitz, Lawrence M., and Navrotsky, Alexandra. Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition. United States: N. p., 2018. Web. doi:10.2138/am-2018-6531.
Lilova, Kristina, Angelis, Michael, Anovitz, Lawrence M., & Navrotsky, Alexandra. Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition. United States. doi:10.2138/am-2018-6531.
Lilova, Kristina, Angelis, Michael, Anovitz, Lawrence M., and Navrotsky, Alexandra. Mon . "Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition". United States. doi:10.2138/am-2018-6531. https://www.osti.gov/servlets/purl/1567001.
@article{osti_1567001,
title = {Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition},
author = {Lilova, Kristina and Angelis, Michael and Anovitz, Lawrence M. and Navrotsky, Alexandra},
abstractNote = {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 $f_{O_2}$ 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.},
doi = {10.2138/am-2018-6531},
journal = {American Mineralogist},
number = 10,
volume = 103,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
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