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Structural and thermal characterisation of nanostructured alumina templates
I.W.M. Brown,M.E. Bowden,T. Kemmitt,K.J.D. MacKenzie 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Nanostructured anodic aluminium oxide materials containing a two dimensional array of high aspect ratio aligned pores of 200 nm.C. Thermal analysis shows two discrete irreversible exothermic eventsat 850.C and 1020 .C. XRD and27Al MAS NMR show the progressive development of local and long range order in the heated struc-tures and indicate a reaction sequence of amorphous Al2O3 ! h-Al2O3 ! a-Al2O3 (corundum). NMR shows the co-existence of alumin-ium 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 animportant role in directing the chemical, physical and structural outcomes of the heat treatment.
Rapid transition from continental breakup to igneous oceanic crust in the South China Sea
Larsen, H. C.,Mohn, G.,Nirrengarten, M.,Sun, Z.,Stock, J.,Jian, Z.,Klaus, A.,Alvarez-Zarikian, C. A.,Boaga, J.,Bowden, S. A.,Briais, A.,Chen, Y.,Cukur, D.,Dadd, K.,Ding, W.,Dorais, M.,Ferré,, E. Nature Publishing Group 2018 Nature geoscience Vol.11 No.10