Synthesis and high-pressure behavior of Na0.3CoO2 center dot 1.3H(2)O and related phases

[摘要] We have prepared powder samples of NaxCoO2.yH(2)O using an alternative synthesis route. Superconductivity was observed in Na0.3CoO2.1.3H(2)O between 4 and 5 K as indicated by the magnetic susceptibility. The bulk compressibilities of Na0.3CoO2.1.3H(2)O, Na0.3CoO2.0.6H(2)O, 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.

[发布日期] 2003-11-01

[关键词] SUPERCONDUCTIVITY;TRANSITION