A novel route to phase formation of superconductive cobalt oxyhydrates using KMnO4 as an oxidizing agent

C. J. Liu, C. Y. Liao, L. C. Huang, C. H. Su, S. Neeleshwar, Y. Y. Chen, C. J.C. Liu

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Abstract

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 4.6-3.8K for samples treated by the aqueous KMnO 4 solution with the molar ratio of KMnO4 relative to the sodium content in the range of 0.03 and 2.29.

Original languageEnglish
Pages (from-to)43-46
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume416
Issue number1-2
DOIs
Publication statusPublished - 2004 Nov 15

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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