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

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

Research output: Contribution to journalArticle

18 Citations (Scopus)

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

Fingerprint

Cobalt
Oxidants
cobalt
Sodium
routes
sodium
Intercalating Agents
Superconducting materials
Superconducting transition temperature
transition temperature
Ions
expansion
cells
ions

All Science Journal Classification (ASJC) codes

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

Cite this

Liu, Chia-Jyi ; Liao, C. Y. ; Huang, L. C. ; Su, C. H. ; Neeleshwar, S. ; Chen, Y. Y. ; Liu, C. J.C. / A novel route to phase formation of superconductive cobalt oxyhydrates using KMnO4 as an oxidizing agent. In: Physica C: Superconductivity and its applications. 2004 ; Vol. 416, No. 1-2. pp. 43-46.
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A novel route to phase formation of superconductive cobalt oxyhydrates using KMnO4 as an oxidizing agent. / Liu, Chia-Jyi; Liao, C. Y.; Huang, L. C.; Su, C. H.; Neeleshwar, S.; Chen, Y. Y.; Liu, C. J.C.

In: Physica C: Superconductivity and its applications, Vol. 416, No. 1-2, 15.11.2004, p. 43-46.

Research output: Contribution to journalArticle

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AU - Liu, Chia-Jyi

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