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Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Hydrogen mobility in transition zone silicates

Fig. 8

Hydrogen diffusion coefficients in ringwoodite and wadsleyite as a function of temperature. Mg < = > 2H, Si < = > Mg + 2H, and Si < = > 4H defect mechanisms are respectively plotted in blue, green, and red. Ringwoodite results are represented with one (open circles) and two (solid circles) defects per simulation supercell in the 2 × 2 × 2 primitive (dashed lines) and 2 × 1 × 1 conventional (solid lines) supercells. The combined Mg < = > 2H and Si < = > Mg + 2H defects in the same 2 × 2 × 2 supercell is shown with dotted circles. Wadsleyite is in purple: empty triangles for Mg < = > 2H defect, empty squares with 7% shear, solid squares with 15% shear, solid triangle with 5% uniaxial strain. Brown circles are extrapolated experimental data from Sun et al. (2015) for ringwoodite, brown triangles from Hae et al. (2006) for wadsleyite. Triple empty triangles are for experiments in polycrystalline wadsleyite (Ohtani and Zhao 2009)

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