Hydration phase diagram for sodium cobalt oxide Na0.3CoO2*yH2O

Details Hydration phase diagram for sodium cobalt oxide Na0.3CoO2*yH2O Hydration phase diagram for sodium cobalt oxide Na0.3CoO2*yH2O

2004-11-15

arxiv.org/abs/cond-mat/0411387v1

Material Research Bulletin vol. 40/4 (2005), p. 665-670

Physics

Condensed Matter

Superconductivity

submitted to Mat. Res. Bull., 4 pages, 4 figures

Scientific paper

The hydration phase diagram for sodium cobalt oxyhydrate, Na0.3CoO2*yH2O (y=0, 0.6, 1.3), was determined as a function of relative humidity at 298K. It is found that greater than 75% relative humidity is needed for complete hydration of anhydrous Na0.3CoO2 to the superconducting phase Na0.3CoO2*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, Na0.3CoO2*0.6H2O, is stable between 10% and 50% relative humidity on hydration, and 35% to 0% relative humidity on dehydration.

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