TY - JOUR
T1 - Interfacial tension of Fe-Si liquid at high pressure
T2 - Implications for liquid Fe-alloy droplet size in magma oceans
AU - Terasaki, Hidenori
AU - Urakawa, Satoru
AU - Rubie, David C.
AU - Funakoshi, Ken ichi
AU - Sakamaki, Tatsuya
AU - Shibazaki, Yuki
AU - Ozawa, Shin
AU - Ohtani, Eiji
N1 - Funding Information:
The authors acknowledge H. Hayashi, S. Ghosh, A. Suzuki, and K.D. Litasov for their technical assistance and to Y. Ito for microprobe analysis. The authors thank S. Labrosse and anonymous reviewers for constructive comments. This work is partly supported by the Grants-in-aid for scientific research from Ministry of Education, Culture, Science, and Sport and Technology of Japanese to E.O. (No. 18104009) and to H.T. (No. 23340159). The experiments have been performed under contract of SPring-8 (Proposal Nos.: 2007B1481 and 2010A1530).
PY - 2012/8
Y1 - 2012/8
N2 - 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.
AB - 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.
KW - Fe-Si
KW - High pressure
KW - Interfacial tension
KW - Magma ocean
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U2 - 10.1016/j.pepi.2012.05.002
DO - 10.1016/j.pepi.2012.05.002
M3 - Article
AN - SCOPUS:84862155201
VL - 202-203
SP - 1
EP - 6
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
ER -