Abstract
High resolution scanning transmission electron microscopy (HRSTEM) and the nanodiffraction patterns of the high T c superconductor of Yba 2 Cu 3 O 7−x were studied with the use of a dedicated VG-HB5 STEM microscope. STEM imaging on the YBa 2 Cu 3 O 7−x [100] shows atomic resolution image of the heavy atoms. Approximately 750 diffiaction patterns were recorded with the nano-probe electron beam of 3A in diameter scanned over a region of 20A×12A on the specimen. Simulation of the diffraction patterns is employed to recognize the patterns for beams centered on Cu(1), O(4), Ba and Y. The local symmelry around an individual atom can then be studied. STEM images of the Yba 2 Cu 3 O 7−x [001] show the edge dislocations temlinating at the grain boundary and the microdiffraction patterns show the 2-fold symmetry for the core of the dislocation and the (110) plane symmetry for the grain boundary.
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