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- W2000695437 abstract "Tracer diffusion in Fe–FeS eutectic melts has been measured at 2.2 and 5 GPa up to 150°C above the solidus using 57Fe and Co thin foils. A new horizontal furnace arrangement for the multi-anvil press is presented, which inhibits convection in the sample and allows diffusion measurements in inviscid materials. The measured diffusivities are identical for 57Fe and Co, and similar to those of pure metals (10−4–10−5 cm2/s). The remarkable agreement between the measured diffusivities at 5 GPa and the value for the inner core boundary derived from ab initio simulations supports the semi-empirical prediction of Poirier [Poirier, J.P., 1988. Transport properties of liquid metals and viscosity of the Earth's core. Geophys. J. 92, 99–105.] and others that transport properties should be constant along a homologous path. The very high activation energies for diffusion (QD 5 GPa=252±23 kJ/mol) agree well with published values for viscosity (QV 5 GPa=240±72 kJ/mol) and imply a stronger causational link between metal diffusion and viscosity than previously suggested. That is, viscosity is not solely controlled by sulfur polymerization in the melt." @default.
- W2000695437 created "2016-06-24" @default.
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- W2000695437 date "2000-06-01" @default.
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- W2000695437 title "57Fe and Co tracer diffusion in liquid Fe–FeS at 2 and 5 GPa" @default.
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- W2000695437 doi "https://doi.org/10.1016/s0031-9201(00)00150-3" @default.
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