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

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

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

Superconductivity 2007-05-23 v1

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

Abstract

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.

Keywords

sodium cobalt oxide hydration phase diagram superconducting phase relative humidity dehydration

Cite

@article{arxiv.cond-mat/0411387,
  title  = {Hydration phase diagram for sodium cobalt oxide Na0.3CoO2*yH2O},
  author = {M. L. Foo and T. Klimczuk and R. J. Cava},
  journal= {arXiv preprint arXiv:cond-mat/0411387},
  year   = {2007}
}

Comments

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

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