The diffusion of self and impurity cations in single crystals was studied. The diffusion penetration profiles were determined by means of secondary ion mass spectrometry. The diffusion profiles were affected by lattice and dislocation diffusion contributions. The temperature dependences of the lattice and dislocation diffusion for 16 species were determined. It was found that the dislocation diffusion coefficients were 4 to 6 orders of magnitude larger than those for lattice diffusion, although the activation energies for lattice and dislocation diffusion (for a given element) were not very different. A linear correlation was found between the pre-exponential factor and the activation energy for both lattice and dislocation diffusion. The elements could be separated into 2 groups, according to their tendencies. The slopes of the lines for lattice and dislocation diffusion corresponded to those predicted by Zener elastic theory.

Systematics of Cationic Diffusion in Single-Crystal MgO. I.Sakaguchi: Journal of the Crystallographic Society of Japan, 1999, 41[5], 293-7