頁籤選單縮合
| 題 名 | Effect of Nano-Scale Additions on the Superconductivity and Pinning Mechanism in the Sm-Ba-Cu-O Materials |
|---|---|
| 作 者 | Chen, Shih-yun; Hseih, Ping-chi; Chen, In-Gann; Wu, Maw-kuen; | 書刊名 | Chinese Journal of Physics |
| 卷 期 | 43:3(2) 民94.06 |
| 頁 次 | 頁666-674 |
| 分類號 | 337.473 |
| 關鍵詞 | |
| 語 文 | 英文(English) |
| 英文摘要 | This study presents the effect of small amounts of different kinds of nano-scale additives: Y₂O₃, Al₂O₃, and SiO₂ on superconductivity and microstructure which were mixed with pre cursor powders (SmBa₂Cu₃O₇+ Sm₂BaCuO₅) followed by TSMG processing in air. SEM and TEM were used to investigate the size and morphology of the 211-particles, the distribution of additives and defects (e. g. dislocations) in the matrix. It is shown that with small amounts (0.1wt%) addition, the 211-particles sizes of all samples are similar to the un-doped sample, and the critical temperature, T onsetc , for all samples are similar and independent of the type of additives, while the enhancement of critical current density, Jc(H, T ), varied with the types of nano-scale additives. However, in samples with larger amounts of 1wt% Al₂O₃and SiO₂ additives, 211-particles become larger and tend to aggregate with both Tc and Jc decrease dramatically. The Jc(H, T ) data were analyzed by the scaling rule to differentiate the pinning mechanisms with different nano-scale additives. The above results indicated that the chemical reactions between nano-scale additives and the matrix are different during peritectic transformation: some nmY₂O₃become compositional fluctuation region within the Sm123 (Sm1Ba₂Cu₃Oy) matrix; on the other hand, nmAl₂O₃ and nmSiO₂ reacts with the matrix and results in the suppression of superconductivity. |
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