The effect of colonies of aligned grains on critical current in high-temperature superconductors
| Autor: | J.A. Sutliff, Amit Goyal, J.A. DeLuca, Clyde L. Briant, Eliot D. Specht, J.E. Tkaczyk, D. M. Kroeger |
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| Rok vydání: | 1995 |
| Předmět: |
High-temperature superconductivity
Materials science Condensed matter physics Energy Engineering and Power Technology Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Magnetic field law.invention law Grain boundary Cubic zirconia Crystallite Texture (crystalline) Electrical and Electronic Engineering Yttria-stabilized zirconia |
| Zdroj: | Physica C: Superconductivity. 242:164-168 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(94)02382-4 |
| Popis: | X-ray microdiffraction has been used to map the orientational distribution of grains in a 4 × 5mm 2 polycrystalline film of Tl 1− y Ba 2 Cu 2 Cu 3 O x (Tl-1223) grown on yttira-stabilized zirconia (YSZ). The film consists of “colonies”, each containing ∼ 10 4 grains with their a -axes aligned; the c -axes of all grains are aligned normal to the film, but there is no overall a -axis alignment. While the grain boundaries within a colony are small angle, colonies are separated by large-angle tilt boundaries. The typical colony size is 0.4 mm. Measured critical currents are compared with simulations based on observed distributions of grain alignment; we find that variations in grain alignment account for the observed variations in the critical current density. Simulations over longer distances indicate that a colony structure can substantially increase the critical current, especially in magnetic fields. |
| Databáze: | OpenAIRE |
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