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Solid phases of FeSi to 47 GPa and 2800 K; new data

Zachary M. Geballe and Raymond Jeanloz
Solid phases of FeSi to 47 GPa and 2800 K; new data
American Mineralogist (April 2014) 99 (4): 720-723


FeSi remains crystalline up to at least 2350 (+ or -200) K at 23 GPa and 2770 (+ or -200) K at 47 GPa in a laser-heated diamond-anvil cell, showing that addition of silicon does not cause a large amount of melting point depression; the melting temperature of pure iron ranges from 2300 (+ or -100) K to 2700 (+ or -150) K between 20 and 50 GPa. The transition between epsilon (B20) and B2 (CsCl-structured) crystalline phases occurs at 30 (+ or -2) GPa at all temperatures from 1200 to 2400 K. The resulting 5% density increase may cause an increase in the miscibility of silicon in iron at P > 30 GPa, with potential implications for the cores of small rocky planets such as Mars and Mercury.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 4
Title: Solid phases of FeSi to 47 GPa and 2800 K; new data
Affiliation: University of California at Berkeley, Department of Earth and Planetary Sciences, Berkeley, CA, United States
Pages: 720-723
Published: 201404
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 22
Accession Number: 2014-030308
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201419
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