Skip to Main Content
Skip Nav Destination
GEOREF RECORD

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 and Alexandra Navrotsky
Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition
American Mineralogist (October 2018) 103 (10): 1599-1603

Abstract

The surface energy (hydrated surfaces) of fayalite (alpha -Fe (sub 2) SiO (sub 4) ) was determined to be 2.47 + or - 0.25 J/m (super 2) using high-temperature oxide melt solution calorimetry. This is larger than the surface energy of magnetite (Fe (sub 3) O (sub 4) ), but lower than that of forsterite (alpha -Mg (sub 2) SiO (sub 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 fO (sub 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 (sub 2) SiO (sub 4) by about 1 GPa.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 103
Serial Issue: 10
Title: Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition
Affiliation: University of California at Davis, Peter A. Rock Thermochemistry Laboratory, Davis, CA, United States
Pages: 1599-1603
Published: 201810
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 31
Accession Number: 2019-007186
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Secondary Affiliation: University of Arkansas at Little Rock, USA, United StatesOak Ridge National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201906
Close Modal

or Create an Account

Close Modal
Close Modal