Non-superconducting Na0.3CoO2 center dot 2H(2)O

摘要

We have been able to synthesize Na0.3CoO2 center dot 2H(2)O and determine the structure of this bi-layer hydrate with a monoclinic lattice distortion while essentially maintaining the spatial separation of the CoO2 layers as in the superconducting Na0.3CoO2 center dot 1.4H(2)O. Magnetization data of Na0.3CoO2 center dot 2H(2)O reveal a loss of superconductivity above 2 K.