In situ measurement of interfacial tension of Fe-S and Fe-P liquids under high pressure using X-ray radiography and tomography techniques

H. Terasaki, Satoru Urakawa, K. Funakoshi, N. Nishiyama, Y. Wang, K. Nishida, T. Sakamaki, A. Suzuki, E. Ohtani

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Interfacial tension is one of the most important properties of the liquid iron alloy that controls the core formation process in the early history of the Earth and planets. In this study, we made high-pressure X-ray radiography and micro-tomography measurements to determine the interfacial tension between liquid iron alloys and silicate melt using the sessile drop method. The measured interfacial tension of liquid Fe-S decreased significantly (802-112 mN/m) with increasing sulphur content (0-40 at%) at 1.5 GPa. In contrast, the phosphorus content of Fe had an almost negligible effect on the interfacial tension of liquid iron. These tendencies in the effects of light elements are consistent with those measured at ambient pressure. Our results suggest that the effect of sulphur content on the interfacial tension of liquid Fe-S (690 mN/m reduction with the addition of 40 at% S) is large compared with the effect of temperature (∼273 mN/m reduction with an increase of 200 K). The three-dimensional structure of liquid Fe-S was obtained at ∼2 GPa and 1373-1873 K with a high-pressure tomography technique. The Fe-S droplet was quite homogeneous when evaluated in a slice of the three-dimensional image.

Original languageEnglish
Pages (from-to)220-226
Number of pages7
JournalPhysics of the Earth and Planetary Interiors
Volume174
Issue number1-4
DOIs
Publication statusPublished - May 2009

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radiography
in situ measurement
tomography
interfacial tension
liquid
liquids
liquid alloys
iron alloys
x rays
iron
sulfur
light elements
silicate melt
phosphorus
planets
silicates
tendencies
droplet
histories
planet

Keywords

  • Core formation
  • High pressure
  • Interfacial tension
  • Tomography

ASJC Scopus subject areas

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

Cite this

In situ measurement of interfacial tension of Fe-S and Fe-P liquids under high pressure using X-ray radiography and tomography techniques. / Terasaki, H.; Urakawa, Satoru; Funakoshi, K.; Nishiyama, N.; Wang, Y.; Nishida, K.; Sakamaki, T.; Suzuki, A.; Ohtani, E.

In: Physics of the Earth and Planetary Interiors, Vol. 174, No. 1-4, 05.2009, p. 220-226.

Research output: Contribution to journalArticle

Terasaki, H. ; Urakawa, Satoru ; Funakoshi, K. ; Nishiyama, N. ; Wang, Y. ; Nishida, K. ; Sakamaki, T. ; Suzuki, A. ; Ohtani, E. / In situ measurement of interfacial tension of Fe-S and Fe-P liquids under high pressure using X-ray radiography and tomography techniques. In: Physics of the Earth and Planetary Interiors. 2009 ; Vol. 174, No. 1-4. pp. 220-226.
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