National Changhua University of Education Institutional Repository : Item 987654321/14241
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题名: Water Intercalation of Sodium Cobalt Oxides Using Aqueous Permanganate Solution
作者: Liu, Chia-Jyi;Liao, Chia-Yuan;Hung, Wen-Ching;Wang, Jung-Sheng;Sheu, Hwo-Shuenn
贡献者: 物理學系
关键词: A. Superconductors;A. Oxides;B. Chemical synthesis;C. X-ray diffraction;C. XAFS (EXAFS and XANES);D. Transport properties
日期: 2008-05
上传时间: 2012-09-10T06:15:28Z
出版者: Elsevier
摘要: We report direct synthesis of the potassium sodium cobalt oxyhydrates (Na,K)x(H2O)yCoO2−δ using the aqueous KMnO4 solution. Two distinct novel phases of (Na,K)x(H2O)yCoO2−δ are synthesized depending on the molar ratio of KMnO4/Na used to treat γ-Na0.7CoO2. Low molar ratio of KMnO4/Na leads to a superconductive phase with c≈19.6 Å, whereas high molar ratio of KMnO4/Na leads to a non-superconductive phase with c≈13.9 Å. According to the chemical analyses, it is found that a partial or even almost complete replacement of K+ for Na+ in the alkaline layers. When using aqueous KMnO4 solution with low molar ratio of KMnO4/Na, the water intercalation is very slow. We also present the XANES spectra on (Na,K)x(H2O)yCoO2−δ. The oxidation state of the Co for the 0.3X sample (c≈19.6 Å) is higher than that of the 40X sample (c≈13.9 Å) with a chemical shift of 3.5 eV.
關聯: Journal of Physics and Chemistry of Solids, 69(5-6): 1483-1485
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