On crystal alignment in polycrystalline YBCO materials based on TEM observation |
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Authors: | P C W Fung J C L Chow and J Gao |
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Affiliation: | (1) Physics Department, The University of Hong Kong, Hong Kong |
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Abstract: | Previously, we have observed that parallel lattice fringes show up regularly in MTG samples, indicative of good alignment of unit cells in strips of size 100 nm × a few times 100 nm. We have prepared films ( 80 nm) for TEM observation using YBCO material fabricated by the conventional solid-state reaction method in order to study the crystal texture in a length scale from a few 100 nm down to 3 Å. Parallel lattice fringes are observed to stretch across a cross-section 0.3×0.5 m2. Cross lattice fringes intersecting at 90° and 45° are observed as rare events. This result suggests that the degree of alignment in the crystal texture is higher than expected inside a grain of size a few m. |
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Keywords: | YBa2Cu3O7– " target="_blank">gif" alt="delta" align="BASELINE" BORDER="0"> transmission electron microscope grain alignment |
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