Vacancy ordering in the structure of γ-Al2O3

The defect structure of gamma-Al2O3, prepared by the thermal decomposition of well-crystallised, high purity boehmite (gamma-AlOOH), was studied by HREM. It is shown that the intrinsic feature of gamma-alumina structure is a presence of almost hexagonal closed loops formed due to the ordering of cat...

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Published inJournal of the European Ceramic Society Vol. 20; no. 8; pp. 1187 - 1189
Main Authors Kryukova, G.N, Klenov, D.O, Ivanova, A.S, Tsybulya, S.V
Format Journal Article
LanguageEnglish
Published 01.07.2000
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Summary:The defect structure of gamma-Al2O3, prepared by the thermal decomposition of well-crystallised, high purity boehmite (gamma-AlOOH), was studied by HREM. It is shown that the intrinsic feature of gamma-alumina structure is a presence of almost hexagonal closed loops formed due to the ordering of cation vacancies over octahedral positions on (110) and (111) planes. These defects are relatively stable; they are preserved, though being changed in shape, in the gamma-alumina sample upon its further calcination until the appearance of traces of delta-alumina phase. 8 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0955-2219
DOI:10.1016/S0955-2219(99)00278-2