Skip to main content
Progress in Earth and Planetary Science

Table 2 Hydrogen diffusivity

From: Hydrogen mobility in transition zone silicates

Defect

Mineral

H/O ratio

H2O wt%

Geometry

D 0(m2/s)

H (kJ/mol)

Mg < = > 2H

R

1/16

1.63

2 × 2 × 2 P

9.73E-02

303.8

1/32

0.81

2 × 1 × 1 C

4.16E-04

224.5

Si < = > Mg + 2H

R

1/16

1.60

2 × 1 × 1 C

1.19E-05

159.9

1/32

0.80

2 × 1 × 1 C

6.44E-05

209.5

Si < = > 4H

R

1/8

1.62

2 × 1 × 1 C

5.05E-04

260.9

1/16

3.27

2 × 1 × 1 C

2.26E-06

188.3

Mg < = > 2H and Si < = > Mg + 2H

R

1/16

1.62

2 × 2 × 2 P

5.32E-04

232.4

Mg < = > 2H

W

1/16

1.63

1 × 1 × 1

5.62E-05

183.2

  1. Diffusivity fits to the computed diffusion coefficients
Back to article page