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http://ir.ncue.edu.tw/ir/handle/987654321/14192
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| 題名: | A Novel Route to Phase Formation of Superconductive Cobalt Oxyhydrates Using KMnO4 as an Oxidizing Agent |
| 作者: | Liu, Chia-Jyi;Liao, C. Y.;Huang, L. C.;Su, C. H.;Neeleshwar, S.;Chen, Y. Y.;Liu, C. J. C. |
| 貢獻者: | 物理學系 |
| 日期: | 2004-11
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| 上傳時間: | 2012-09-10T06:14:25Z
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| 出版者: | Elsevier |
| 摘要: | We have first successfully synthesized the sodium cobalt oxyhydrate superconductors using KMnO4 as a de-intercalating and oxidizing agent. It is a novel route to form the superconductive phase of cobalt oxyhydrates without resort to the commonly used Br2/CH3CN solution. The role of KMnO4 is to de-intercalate the Na+ from the parent compound Na0.7CoO2 and oxidize the Co ion as a result. The higher molar ratio of KMnO4 relative to the sodium content tends to remove more Na+ from the parent compound and results in a slight expansion of the c-axis in the unit cell. The superconducting transition temperature is 4.6–3.8 K for samples treated by the aqueous KMnO4 solution with the molar ratio of KMnO4 relative to the sodium content in the range of 0.03 and 2.29. |
| 關聯: | Physica C: Superconductivity, 416(1-2): 43-46 |
| 顯示於類別: | [物理學系] 期刊論文
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