TY - JOUR
T1 - The effect of temperature, pressure, and sulfur content on viscocity of the Fe-FeS melt
AU - Terasaki, Hidenori
AU - Kato, Takumi
AU - Urakawa, Satoru
AU - Funakoshi, Ken ichi
AU - Suzuki, Akio
AU - Okada, Taku
AU - Maeda, Makoto
AU - Sato, Jin
AU - Kubo, Tomoaki
AU - Kasai, Shidu
PY - 2001
Y1 - 2001
N2 - The Fe-FeS melt is thought to be the major candidate of the outer core material. Its viscosity is one of the most important physical properties to study the dynamics of the convection in the outer core. We performed the in situ viscosity measurement of the Fe-FeS melt under high pressure using X-ray radiography falling sphere method with a novel sample assembly. Viscosity was measured in the temperature, pressure, and compositional conditions of 1233-1923 K, 1.5-6.9 GPa, and Fe-Fe72S28 (wt%), respectively. The viscosity coefficients obtained by 17 measurements change systematically in the range of 0.008-0.036 Pa s. An activation energy of the viscous flow, Q=30.0±8.6 kJ/mol, and the activation volume, △V=1.5±0.7 X 10-6 m3/mol, are determined as the temperature and pressure dependence, and the viscosity of the Fe72S28 melt is found to be smaller than that of the Fe melt by 15 ± 10%. These tendencies can be well correlated with the structural variation of the Fe-FeS melt.
AB - The Fe-FeS melt is thought to be the major candidate of the outer core material. Its viscosity is one of the most important physical properties to study the dynamics of the convection in the outer core. We performed the in situ viscosity measurement of the Fe-FeS melt under high pressure using X-ray radiography falling sphere method with a novel sample assembly. Viscosity was measured in the temperature, pressure, and compositional conditions of 1233-1923 K, 1.5-6.9 GPa, and Fe-Fe72S28 (wt%), respectively. The viscosity coefficients obtained by 17 measurements change systematically in the range of 0.008-0.036 Pa s. An activation energy of the viscous flow, Q=30.0±8.6 kJ/mol, and the activation volume, △V=1.5±0.7 X 10-6 m3/mol, are determined as the temperature and pressure dependence, and the viscosity of the Fe72S28 melt is found to be smaller than that of the Fe melt by 15 ± 10%. These tendencies can be well correlated with the structural variation of the Fe-FeS melt.
UR - http://www.scopus.com/inward/record.url?scp=0034896628&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034896628&partnerID=8YFLogxK
U2 - 10.1016/S0012-821X(01)00374-0
DO - 10.1016/S0012-821X(01)00374-0
M3 - Article
AN - SCOPUS:0034896628
VL - 190
SP - 93
EP - 101
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
SN - 0012-821X
IS - 1-2
ER -