Effect of Annealing on the Surface Microstructure of Y-Ba-Cu-O Superconducting Ceramics |
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| Authors: | Dong-Sook Sinn Moon G. Kim |
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| Affiliation: | Department of Inorganic Materials Engineering, Seoul National University, Seoul 151–742, Korea |
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| Abstract: | Precusors to the YBa2Cu3O7-δ material were prepared by both the oxalate precipitation method and conventional ceramic processing. Second-phase grains were observed to develop on the exposed fracture surface during annealing at 500° to 600°C in an ambient atmosphere. The second-phase grains were identified to be BaCO3 using EDX and XRD. The liquid phase, which was formed because of local chemical inhomogeneity in the Y-Ba-Cu-O system, contributed to the formation of second-phase grains as a source of Ba. |
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| Keywords: | superconductors liquid phase annealing second phase grains |
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