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
PY - 2012/8/1
Y1 - 2012/8/1
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 -