Viscosity of Fe‐Ni‐C Liquids up to Core Pressures and Implications for Dynamics of Planetary Cores

The viscosity of iron alloy liquids is the key for core dynamo and core-mantle differentiation terrestrial bodies. Here we measured Fe-Ni-C up to 7 GPa using floating sphere viscometry method 330 first-principles calculations. We found a increase at ∼3–5 GPa, coincident with structural transition in liquids. After transition, reaches ∼14–27 mPa·s, factor 2–4 higher than that Fe Fe-S Our computational results from 5 also indicate high For carbon-rich large body, level turbulence outer would be lessened approaching inner boundary. It anticipated percolate Earth's deep silicate mantle much slower speed