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Title: Preparation of Superconducting Nax(H2O)yCoO2 Using NaMnO4 as the Deintercalation and Oxidation Agent
Authors: Liu, Chia-Jyi;Hung, Wen-Chin;Wang, Jung-Sheng;Liu, Chia-Jung Charlie
Contributors: 物理學系
Date: 2005
Issue Date: 2012-09-10T06:14:38Z
Publisher: American Chemical Society
Abstract: We have used aqueous NaMnO4 solution as the deintercalation and oxidation agent to treat γ-Na0.7CoO2 powders and to successfully obtain superconducting sodium cobalt oxyhydrates, Nax(H2O)yCoO2, with onset Tc ≈ 4.6 K without using highly toxic Br2/CH3CN solution. Chemical analyses indicate that the sodium content x decreases with increasing concentration of NaMnO4 solution and depends slightly on the immersion time. Unlike using a high concentration of aqueous KMnO4 as the deintercalation and oxidation agent, all the hydrated products are the c ≈ 19.6 Å phase with bilayers of water molecules intercalated between the CoO2 layers and sodium layers because of the absence of K+ in the Na+ layers.
Relation: J. Am. Chem. Soc., 127(3): 830-831
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