Influence of Grain Boundary Morphology on Superconducting Properties in YBa2Cu3Ox Ceramics
| Autor: | Makoto Kuwabara, Takeshi Inada |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics General Chemistry Condensed Matter Physics Behavioral traits Crystallography Transmission electron microscopy visual_art Lattice (order) Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Grain boundary Ceramic Critical current Grain boundary strengthening |
| Zdroj: | Journal of the Ceramic Society of Japan. 103:484-488 |
| ISSN: | 1882-1022 0914-5400 |
| DOI: | 10.2109/jcersj.103.484 |
| Popis: | The critical current density (Jc) in small-grained YBa2Cu3Ox ceramics with varied sintered densities has been found to show characteristic behavior with a peak around a relative sintered density (R. D.) of 90%. This characteristic behavior of Jc in the materials has been investigated from the view points of the changes of both their grain morphologies and grain boundary dislocation structures (GBD) associated with sintered density. GBD networks occurred to relax the localized strain at the grain boundaries regardless the degree of lattice matching thereof, which was estimated using a coincidence-site-lattice (CSL) model. The GBD networks existing at the boundaries were found to reduce the Jc of the materials. The width (δ) of GBD in the materials, determined by transmission electron microscopy, was found to increase rapidly above 90% R. D. The increase in δ is explained in terms of accumulated internal stresses at the grain boundaries, which are assumed to originate from an increase in the aspect ratio of the ceramic grains. |
| Databáze: | OpenAIRE |
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