Phase Transformations and Control of Habit in Lyothermal Synthesis of α-Al2O3

Andreas Kaiser, H. Bertagnolli

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The phase transformation of gibbsite to corundum (α-Al203) in 1,5-pentanediol (glycothermal treatment) was investigated between 270 and 450°C and between 10 and 50 MPa. The kinetics of transformation to corundum in this range are hindered. Only the formation of microcrystalline tohdite (5 A1203 : 1H20 ) can be observed. The lowering of the nucleation energy of corundum by adding α-Al203 seeds enables the synthesis of microcrystalline corundum at 330°C. The size of the gibbsite particles and the size and quantity of the α-Al203 seeds are important for the homogeneity and particle size of the resulting corundum. The particle size and the
morphology of glycothermal α-Al203 powders were compared with the results of hydrothermal synthesis of α-Al203.

Original languageEnglish
JournalJournal of the European Ceramic Society
Pages (from-to)77-83
Publication statusPublished - 1994
Externally publishedYes


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