Hydration phase diagram for sodium cobalt oxide Na0.3CoO 2·yH2O

M. L. Foo, T. Klimczuk, R. J. Cava

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Abstract

The hydration phase diagram for sodium cobalt oxhydrate, Na 0.3CoO2·yH2O (y = 0, 0.6 and 1.3), was determined as a function of relative humidity at 298 K It is found that greater than 75% relative humidity is needed for complete hydration of anhydrous Na 0.3CoO2 to the superconducting phase Na 0.3CoO2·1.3H2O. Dehydration studies show that a minimum of 43% relative humidity is needed to maintain the stability of the fully hydrated superconducting phase. The intermediate hydrate, Na 0.3CoO2·0.6H2O, is stable between 10 and 50% relative humidity on hydration, and 35 and 0% relative humidity on dehydration.

Original languageEnglish (US)
Pages (from-to)665-670
Number of pages6
JournalMaterials Research Bulletin
Volume40
Issue number4
DOIs
StatePublished - Apr 20 2005

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • A. Layer compounds
  • A. Oxides
  • C. X-ray diffraction
  • D. Superconductivity

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