Abstract
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.
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