National Changhua University of Education Institutional Repository : Item 987654321/14192
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题名: 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.
贡献者: 物理學系
日期: 2004-11
上传时间: 2012-09-10T06:14:25Z
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
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