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- W2007478668 abstract "Abstract Oxygen self-diffusion coefficients were determined in polycrystals of α-alumina either ‘undoped’ or doped with 500wt.ppm (225molppm) Y2O3 in the temperature range 1460-1720°C, with 18O2 and secondary-ion mass spectrometry. Oxygen grain-boundary diffusion coefficients obey the relations for ‘undoped’ alumina and for ‘yttrium-doped’ alumina. The comparison between the two materials indicates that yttrium addition decreases the oxygen grain-boundary diffusion. For both materials, it was observed that the activation energy of grain-boundary diffusion is greater than the activation energy of the bulk diffusion. Similar results were obtained in single crystals for diffusion in the bulk and in subboundaries. These results were interpreted as being due to impurity segregation along boundaries and led to a model." @default.
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- W2007478668 date "1996-04-01" @default.
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- W2007478668 title "Self-diffusion in α‒Al<sub>2</sub>O. IV. Oxygen grain-boundary self-diffusion in undoped and yttria-doped alumina polycrystals" @default.
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- W2007478668 doi "https://doi.org/10.1080/01418619608243697" @default.
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