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

Lilova, Kristina; Angelis, Michael; Anovitz, Lawrence M.; Navrotsky, Alexandra

doi:10.2138/am-2018-6531

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

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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 $$f_{O_2}$$ 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.

Authors:

Lilova, Kristina ^[1]; Angelis, Michael ^[2];

^[3]; Navrotsky, Alexandra ^[1]

Univ. of California, Davis, CA (United States). Peter A. Rock Thermochemistry Lab.
Univ. of Arkansas at Little Rock, Little Rock, AR (United States). Dept. of Earth Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: 2018-10-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

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.

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                    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.  https://doi.org/10.2138/am-2018-6531

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                    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.  https://doi.org/10.2138/am-2018-6531.  https://www.osti.gov/servlets/purl/1567001.

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@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}

}

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