Interfacial tension of Fe-Si liquid at high pressure: Implications for liquid Fe-alloy droplet size in magma oceans

Hidenori Terasaki, Satoru Urakawa, David C. Rubie, Ken ichi Funakoshi, Tatsuya Sakamaki, Yuki Shibazaki, Shin Ozawa, Eiji Ohtani

Research output: Contribution to journalArticle

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Abstract

The interfacial tension of Fe-Si liquid was measured using in situ X-ray radiography at high pressure and temperatures using the sessile drop method. The interfacial tension of Fe-Si liquid decreases (from 665 to 407. mN/m) with increasing temperature (1673-2173. K) at 1.5. GPa. The interfacial tension also decreases gradually with increasing Si content (0-25. at%), suggesting that Si behaves as a " moderately" surface-active element. Comparing the effects of different light elements on the interfacial tension of liquid iron, the most effective elements for reducing the interfacial tension lie in the order S. >. Si. >. P, although P has almost no effect. The droplet size of emulsified Fe-alloys in a magma ocean are estimated to be larger for Fe-Si and Fe-P liquids and smaller for Fe-S (S. >. 10. at%) liquid compared with that for pure Fe liquid. Therefore, if droplets in a magma ocean are enriched in S, chemical equilibrium between droplets and silicate melt is established faster in the magma ocean compared to Fe, Fe-Si and Fe-P liquids.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysics of the Earth and Planetary Interiors
Volume202-203
DOIs
Publication statusPublished - Aug 2012

Fingerprint

liquid alloys
magma
droplet
oceans
interfacial tension
liquid
ocean
liquids
radiography
light elements
silicate melt
chemical equilibrium
silicates
iron

Keywords

  • Fe-Si
  • High pressure
  • Interfacial tension
  • Magma ocean

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Physics and Astronomy (miscellaneous)
  • Astronomy and Astrophysics

Cite this

Interfacial tension of Fe-Si liquid at high pressure : Implications for liquid Fe-alloy droplet size in magma oceans. / Terasaki, Hidenori; Urakawa, Satoru; Rubie, David C.; Funakoshi, Ken ichi; Sakamaki, Tatsuya; Shibazaki, Yuki; Ozawa, Shin; Ohtani, Eiji.

In: Physics of the Earth and Planetary Interiors, Vol. 202-203, 08.2012, p. 1-6.

Research output: Contribution to journalArticle

Terasaki, Hidenori ; Urakawa, Satoru ; Rubie, David C. ; Funakoshi, Ken ichi ; Sakamaki, Tatsuya ; Shibazaki, Yuki ; Ozawa, Shin ; Ohtani, Eiji. / Interfacial tension of Fe-Si liquid at high pressure : Implications for liquid Fe-alloy droplet size in magma oceans. In: Physics of the Earth and Planetary Interiors. 2012 ; Vol. 202-203. pp. 1-6.
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