Abstract
Microstructure features in correlation with the incommensurate modulation and potassium position in Bi4.2K0.8Fe2O9+δ (BKFO) nanobelts were studied by scanning transmission electron microscopy (STEM). Atomic displacements following the modulation wave were well characterized by a wave function for each atomic layer. The potassium position in perovskite layers can be directly observed with the incoherent Z-contrast imaging technique. Present results show that high-resolution high-angle annular dark-field (HAADF) imaging provides a powerful tool to study chemical and structural nature of this material on the atomic scale.
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