Abstract
Diffusion of cations (self-, impurities) in single-crystal MgO have been studied. The diffusion penetration profiles were obtained with the aid of a secondary ion mass spectrometry (SIMs) . The diffusion profiles contained lattice and dislocation diffusion contributions. The temperature dependence of lattice and dislocation diffusion for 16 species has been determined. The dislocation diffusion coefficients were 4 to 6 orders of magnitude larger than those of lattice diffusion, although the activation energies for lattice and dislocation diffusion on the same element were not so different. A linear correlation between pre-exponential factor and activation energy for lattice and dislocation diffusion has been confirmed. The elements were separated into two trends of lines by the geometrical condition. The slope of these lines on lattice and dislocation diffusion corresponds with that expected from Zener's elastic theory.
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