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

6 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
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

Funding

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.

Keywords

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

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@article{589ebd45c46449329375fb097d8b03f0,

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",

month = oct,

day = "25",

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

language = "English",

volume = "103",

pages = "1599--1603",

journal = "American Mineralogist",

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TY - JOUR

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

UR - https://www.scopus.com/pages/publications/85054584924

U2 - 10.2138/am-2018-6531

DO - 10.2138/am-2018-6531

M3 - Article

AN - SCOPUS:85054584924

SN - 0003-004X

VL - 103

SP - 1599

EP - 1603

JO - American Mineralogist

JF - American Mineralogist

IS - 10

ER -

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

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