Novel Synthesis and High Pressure Behavior of Na0.3CoO2 x 1.3 H2O and Related Phases

Abstract

We have prepared powder samples of NaxCoO2 x yH2O using a new synthesis route. Superconductivity was observed in Na0.3CoO2 x 1.3H2O between 4 and 5K as indicated by the magnetic susceptibility. The bulk compressibilities of Na0.3CoO2 x 1.3H2O, Na0.3CoO2 x 0.6H2O and Na0.3CoO2 were determined using a diamond anvil cell and synchrotron powder diffraction. Chemical changes occurring under pressure when using different pressure transmitting media are discussed and further transport measurements are advocated.

arXiv comment7 pages, 4 figures, PRrapid submitted

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• Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component
• Pressure effects in the triangular layered cobaltites NaxCoO2
• Synthesis and Structure of the Monolayer Hydrate K03CoO2 x 04H2O
• Thermal Expansion and Compressibility in Superconducting NaxCoO2o4xD2O (x?1/3): Evidence for Pressure-Induced Charge Redistribution
• Proton incorporations and superconductivity in a cobalt oxyhydrate