Volume, Grain Boundary and Surface Diffusion of an Isotope in some Refractory Oxide Systems: A Comparison
It is the purpose of this paper to compare some recent results obtained on volume, grain boundary diffusion and surface diffusion of 51Cr in refractory oxides such as MgO, A12O3 and MgA12O4. In these materials the concentration of intrinsic point defects is very small and diffusion transport phenomena are very sensitive to the concentration of aliovalent impurities. However, from the technological point of view the knowledge of transport phenomena in these materials is important to explain sintering, grain growth, mechanical, thermal and electrical properties. To avoid uncontrolled influence of impurities carefully doped materials can be used. The doping with aliovalent ions is particularly interesting because the presence of such ions determines the concentration of point defects and allows experiments to be performed with well defined materials.
KeywordsMigration Magnesium Anisotropy Chromium Auger
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