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   <subfield code="a">Aluminium grain boundary diffusion in polycrystalline mullite ceramics</subfield>
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   <subfield code="a">Aluminium tracer diffusivities were measured in polycrystalline mullite. The artificial aluminium isotope 26Al was used as tracer isotope. An advanced preparation technique for the 26Al2O3 tracer source allowed to apply secondary ion mass spectrometry (SIMS) in order to analyse 26Al depth distributions in the polycrystalline material. Pre-exponential factors and activation enthalpies were determined for compositions of 78 wt.% Al2O3, 22 wt.% SiO2 (high-alumina material) and of 72 wt.% Al2O3, 28 wt.% SiO2 (low-alumina material), respectively. A strong dependence of the 26Al grain boundary diffusivity on the composition is observed. The results are discussed in comparison to previous data on grain boundary diffusivities of oxygen in mullite samples from the same batch.</subfield>
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