Fig. 2: Diffusion coefficients of W and Pt under high pressures.
From: Grain boundary diffusion cannot explain the W isotope heterogeneities of the deep mantle
a Diffusion coefficients of W in (Mg0.9Fe0.1)O grain boundary (GB) and (Mg0.8Fe0.2)O liquid as a function of reciprocal temperature under 25 GPa. Previous experimental results for the post-spinel phase are shown for comparison23. b Diffusion coefficients of W and Pt as a function of reciprocal temperature under 140 GPa. The shading area represents the extrapolation of experimental results23 assuming an activation volume of 0–2 cm3 mol−1 (Eq. (4), Methods). Dashed and dotted blue lines are fitted Arrhenius equations (Eq. (3), Methods) over 2000–2750 K and 2750–3500 K, respectively. Other dashed lines are fitted Arrhenius equations from the data points with the same color. Error bars indicate the standard deviations across different simulation runs. Source data are provided as a Source Data file.
