High-resolution electron microscopic study of ba7sc6al2o19 and related phases

R. V. Shpanchenko, L. Nistor, G. Van Tendeloo, S. Amelinckx, E. V. Antipov, L. M. Kovba

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6 Citations (Scopus)


It is shown that the crystal structures of the compound Ba7Sc6Al2O19 and of related structures which belong to the class of hexagonal perovskites can be interpreted as mixed-layer structures consisting of the intergrowth of structural blocks (or lamellae) of β-Ba2ScAlO5 and Ba3Sc4O9, two other hexagonal perovskites. The block sequences have been imaged directly by means of high-resolution electron microscopy. The characteristic geometrical features of the structural blocks allow unambiguous identification of the different sequences. The image interpretation was confirmed by computer-simulated images. The structures can alternatively be considered as interface modulated structures derived from a cubic stacking of close-packed BaO3 layers in which periodic stacking faults and twin boundaries are introduced. These interfaces are stabilized by B cations.

Original languageEnglish
Pages (from-to)193-204
Number of pages12
JournalJournal of Solid State Chemistry
Issue number1
Publication statusPublished - Nov 1994
Externally publishedYes


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