Table 2 Estimate of the parameters necessary to evaluate the self–diffusion coefficients Dsd at different pressures along the geotherm60 using equations (1) and (2). The vacancy concentration Xv is here set equal to 10−2.

From: The role of diffusion-driven pure climb creep on the rheology of bridgmanite under lower mantle conditions

P (GPa)

Depth (km)

T (K)

ν (THz)

l (Å)

ΔHMg (eV)

Dsd (m2/s)

30

809

1992

5.9

2.42

3.8

7.1 ∙ 10−19

60

1457

2256

8.9

2.36

4.7

2.0 ∙ 10−19

90

2060

2487

12.9

2.31

5.4

9.6 ∙ 10−20

120

2617

2689

17.5

2.27

5.9

6.5 ∙ 10−20

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