The diffusion of Cr in alumina monocrystals was studied at temperatures ranging from 1000 to 1500C (table 43). The diffusion profiles were determined by using secondary ion mass spectrometry at depths of less than 1. Bulk diffusion coefficients were deduced from the initial parts of the profiles. The remaining parts of the profiles were explained in terms of dislocation-enhanced diffusion.

Diffusion of Chromium in Alumina Single Crystals. E.G.Moya, F.Moya, A.Sami, D.Juvé, D.Tréheux, C.Grattepain: Philosophical Magazine A, 1995, 72[4], 861-70

Figure 19

Diffusivity of Co in Al2O3