Extended Data Figure 2 : Magnesium and aluminium solubility in metallic iron melt at high pressure and temperature.

From: An early geodynamo driven by exsolution of mantle components from Earth’s core

Extended Data Figure 2

Top, Equilibrium constant for MgO dissolution in molten iron (KMg) as a function of reciprocal temperature (1,000/T). The blue circles correspond to the experimental data (performed in a diamond-anvil cell, DAC; Extended Data Table 1) and the error bars to standard error; the red squares correspond to the low-temperature extrapolation of DFT calculations17 and the error bars to standard error. The thick line corresponds to the least-squares linear fit to the experimental data (Fig. 1); it shows the agreement between the theoretical and experimental datasets, especially at high temperature where the theoretical dataset (which is extrapolated from higher temperatures) is the least influenced by extrapolation. Bottom, Equilibrium constant for Al2O3 dissolution (KAl; see Methods) in molten iron as a function of reciprocal temperature. The circles correspond to the experimental data (Extended Data Table 1) and the error bars to standard error. The thick line corresponds to the least-squares linear fit to the data (R2 = 0.92), and we find log(KAl) = 4.1(1.4) − 36,469(5,260)/T (equation (8)).