Fig. 17
From: A DFT study on hydrogen diffusion across zinc surfaces at low coverage
Convergence of the diffusion coefficient over time: \(D=(\langle \Delta x^2 \rangle + \langle \Delta y^2 \rangle )/4t\). The limit value is \(\approx 7.5 \times 10^{-9}\). The experimental value at \(\hbox {T=50}^{\circ }\) Celsius is around \(6.5 \times 10^{-8}\;\hbox {m}^2/{\text{s}}\)37.
