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

FeSi remains crystalline up to at least 2350 (±200) K at 23 GPa and 2770 (±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 (±100) K to 2700 (±150)...

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Bibliographic Details
Published inThe American mineralogist Vol. 99; no. 4; pp. 720 - 723
Main Authors Geballe, Zachary M, Jeanloz, Raymond
Format Journal Article
LanguageEnglish
Published Washington Mineralogical Society of America 01.04.2014
Walter de Gruyter GmbH
Subjects
alloys
core
Crystal structure
experimental studies
Geophysics
high pressure
High pressures
high temperature
high temperatures
interior
iron
lunar and planetary materials
Mars
Melting
Melting point
Mercury
Mercury Planet
metals
Minerals
new data
phase transitions
Planets
pressure
related to mantle
silicides
Silicon
solid phase
Solid solutions
temperature
Temperature effects
terrestrial planets
ultrahigh pressure
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Summary:FeSi remains crystalline up to at least 2350 (±200) K at 23 GPa and 2770 (±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 (±100) K to 2700 (±150) K between 20 and 50 GPa. The transition between ε (B20) and B2 (CsCl-structured) crystalline phases occurs at 30 (±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
1945-3027
DOI:10.2138/am.2014.4612