The self-diffusion of Zn was measured in monocrystalline oxide samples by using non-radioactive 70Zn as a tracer, and secondary ion mass spectrometry for analysis. It was found that the diffusion coefficients were isotropic, with an activation energy of 372kJ/mol (figure 5). The Zn self-diffusion was expected to be controlled by a vacancy mechanism.

Zinc Self-Diffusion, Electrical Properties and Defect Structure of Undoped Single Crystal Zinc Oxide. G.W.Tomlins, J.L.Routbort, T.O.Mason: Journal of Applied Physics, 2000, 87[1], 117-23

Figure 5

Diffusivity of Zn in Monocrystalline ZnO