The effect of temperature, pressure, and sulfur content on viscocity of the Fe-FeS melt

Hidenori Terasaki, Takumi Kato, Satoru Urakawa, Ken ichi Funakoshi, Akio Suzuki, Taku Okada, Makoto Maeda, Jin Sato, Tomoaki Kubo, Shidu Kasai

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)93-101
Number of pages9
JournalEarth and Planetary Science Letters
Volume190
Issue number1-2
DOIs
Publication statusPublished - 2001

Fingerprint

Sulfur
sulfur
viscosity
melt
Viscosity
outer core
temperature
X ray radiography
Temperature
falling spheres
Viscosity measurement
Viscous flow
radiography
viscous flow
Activation energy
Physical properties
activation energy
Chemical activation
pressure dependence
tendencies

Keywords

  • Autoradiography
  • High pressure
  • Iron-sulfides
  • Melts
  • Outer core
  • Viscosity

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

The effect of temperature, pressure, and sulfur content on viscocity of the Fe-FeS melt. / Terasaki, Hidenori; Kato, Takumi; Urakawa, Satoru; Funakoshi, Ken ichi; Suzuki, Akio; Okada, Taku; Maeda, Makoto; Sato, Jin; Kubo, Tomoaki; Kasai, Shidu.

In: Earth and Planetary Science Letters, Vol. 190, No. 1-2, 2001, p. 93-101.

Research output: Contribution to journalArticle

Terasaki, H, Kato, T, Urakawa, S, Funakoshi, KI, Suzuki, A, Okada, T, Maeda, M, Sato, J, Kubo, T & Kasai, S 2001, 'The effect of temperature, pressure, and sulfur content on viscocity of the Fe-FeS melt', Earth and Planetary Science Letters, vol. 190, no. 1-2, pp. 93-101. https://doi.org/10.1016/S0012-821X(01)00374-0
Terasaki, Hidenori ; Kato, Takumi ; Urakawa, Satoru ; Funakoshi, Ken ichi ; Suzuki, Akio ; Okada, Taku ; Maeda, Makoto ; Sato, Jin ; Kubo, Tomoaki ; Kasai, Shidu. / The effect of temperature, pressure, and sulfur content on viscocity of the Fe-FeS melt. In: Earth and Planetary Science Letters. 2001 ; Vol. 190, No. 1-2. pp. 93-101.
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