Abstract
The lattice and dislocation diffusion coefficients for Ca2+ in single‐crystal MgO have been determined in the temperature range 1743 to 1293 K from the diffusion penetration determined using secondary ion mass spectrometry. The dislocation diffusion coefficients were 4 to 5 orders of magnitude larger than the lattice diffusion coefficients in the same temperature range. The activation energy of Ca2+ lattice diffusion was comparable to that of ionic conductivity. The diffusion mechanism of Ca2+ is related to Mg vacancies.
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