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 language | English |
|---|---|
| Pages (from-to) | 220-226 |
| Number of pages | 7 |
| Journal | Physics of the Earth and Planetary Interiors |
| Volume | 174 |
| Issue number | 1-4 |
| DOIs | |
| Publication status | Published - May 2009 |
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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 journal › Article
}
TY - JOUR
T1 - In situ measurement of interfacial tension of Fe-S and Fe-P liquids under high pressure using X-ray radiography and tomography techniques
AU - Terasaki, H.
AU - Urakawa, Satoru
AU - Funakoshi, K.
AU - Nishiyama, N.
AU - Wang, Y.
AU - Nishida, K.
AU - Sakamaki, T.
AU - Suzuki, A.
AU - Ohtani, E.
PY - 2009/5
Y1 - 2009/5
N2 - 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.
AB - 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.
KW - Core formation
KW - High pressure
KW - Interfacial tension
KW - Tomography
UR - http://www.scopus.com/inward/record.url?scp=67349271152&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67349271152&partnerID=8YFLogxK
U2 - 10.1016/j.pepi.2009.01.004
DO - 10.1016/j.pepi.2009.01.004
M3 - Article
VL - 174
SP - 220
EP - 226
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
IS - 1-4
ER -