Abstract
The structure of the compound Sr4Ni3O9can be described as a stacking of close-packed SrO3layers with omission of oxygens and insertion of nickel ions. The 4H structure can be considered as a translation interface modulated structure of a simpler basic structure. An incommensurate structure, based on the 4H structure, is attributed to a systematic “ledging” of the translation interfaces, similar to that causing the occurrence of incommensurability in long-period superstructures in alloys. This description also allows us to understand the transformation into the commensurate 4H structure after annealing.In situheating inside the electron microscope transforms the 4H stacking into a disordered 9R- or 18R-type structure. Direct imaging by high-resolution electron microscopy confirms the structural models proposed for the different phases on the basis of their diffraction patterns.
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