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

doi:10.2138/am-2018-6531

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 journal › Article › peer-review

5 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 f_O2 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 language	English (US)
Pages (from-to)	1599-1603
Number of pages	5
Journal	American Mineralogist
Volume	103
Issue number	10
DOIs	https://doi.org/10.2138/am-2018-6531
State	Published - Oct 25 2018
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

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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-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.",

keywords = "Olivine-spinel transition, nano fayalite, quartz-fayalite-magnetite (QFM) buffers, quartz-iron-fayalite (QIF) buffers, surface energy",

author = "Kristina Lilova and Deangelis, {Michael T.} and Anovitz, {Lawrence M.} and Alexandra Navrotsky",

note = "Publisher Copyright: {\textcopyright} 2018 Walter de Gruyter GmbH, Berlin/Boston.",

year = "2018",

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doi = "10.2138/am-2018-6531",

language = "English (US)",

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T1 - Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition

AU - Lilova, Kristina

AU - Deangelis, Michael T.

AU - Anovitz, Lawrence M.

AU - Navrotsky, Alexandra

PY - 2018/10/25

Y1 - 2018/10/25

N2 - 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.

AB - 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.

KW - Olivine-spinel transition

KW - nano fayalite

KW - quartz-fayalite-magnetite (QFM) buffers

KW - quartz-iron-fayalite (QIF) buffers

KW - surface energy

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JO - American Mineralogist

JF - American Mineralogist

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

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