"Synthesis and high-pressure behavior of Na0.3CoO2 center dot 1.3H(2)O and related phases"
S. Park, Y. Lee, A. Moodenbaugh, T. Vogt
Physical Review B
Vol.68, No.18, pp.18050, 2003.11
We have prepared powder samples of NaxCoO2⋅yH2O using an alternative synthesis route. Superconductivity was observed in Na0.3CoO2⋅1.3H2O between 4 and 5 K as indicated by the magnetic susceptibility. The bulk compressibilities of Na0.3CoO2⋅1.3H2O, Na0.3CoO2⋅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.