Abstract
The viscosities of liquid Fe73S27 and Fe90S10 alloys were measured by combining a falling-sphere viscometer based on Stokes’ law with the technique of synchrotron radiography to up to 9.4 GPa and 2023 K. A high-speed CCD camera (125 frames/s) enabled the precise terminal velocity of the falling sphere to be determined over pressure and temperature ranges higher than those of previous studies. The effect of pressure on the viscosities was quite small, whereas temperature had a large effect. The apparent activation energies of Fe73S27 and Fe90S10 were quite similar, which indicates that the effect of sulfur content on liquid Fe alloys was negligible. The small effects associated with pressure and sulfur content on the viscosities of liquid Fe alloys show that iron is the dominant component of the viscous flow unit under high pressures. The addition of sulfur may not have a serious effect on the viscous flow of the Earth's outer core.
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