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TitleStructural and thermal characterisation of nanostructured alumina templates
Publication TypeJournal Article
Year of Publication2006
AuthorsBrown, I.W.M., Bowden M.E., Kemmitt T., and Mackenzie K.J.D.
JournalCurrent Applied Physics
Pagination557 - 561
Date Published2006
ISSN15671739 (ISSN)
KeywordsAlumina, Anodic alumina, Aspect ratio, Membrane fabrication, Nanostructured materials, nuclear magnetic resonance spectroscopy, Reaction sequence, Thermoanalysis, Thermodynamic properties, X ray diffraction, XRD
AbstractNanostructured anodic aluminium oxide materials containing a two dimensional array of high aspect ratio aligned pores of 200 nm diameter have been heat treated in air at temperatures up to 1340 °C. Thermal analysis shows two discrete irreversible exothermic events at 850 °C and 1020 °C. XRD and 27Al MAS NMR show the progressive development of local and long range order in the heated structures and indicate a reaction sequence of amorphous Al2O3 → θ-Al2O3 → α-Al2O3 (corundum). NMR shows the co-existence of aluminium in 4, 5 and 6-coordinated sites through most of the heating sequence until the stable (6-coordinated) corundum phase is established. Phosphorus impurities incorporated during the membrane fabrication process crystallise as an AlPO4 phase above 850 °C and play an important role in directing the chemical, physical and structural outcomes of the heat treatment. © 2005 Elsevier B.V. All rights reserved.

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