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Synthesis of Three Layer NaxCoO2 (x=0.3, 0.5, 0.6, 0.75, 1.0) and Superconductivity in Three Layer Na0.3CoO2•1.3H2O

  • M.L. Foo (a1), T. Klimczuk (a1), L. Li (a1), N.P. Ong (a1), R.J. Cava (a1), Q. Huang (a2), J.W. Lynn (a2) and H.W. Zandbergen (a3)...

Abstract

The synthesis of three layer sodium cobalt oxide, NaxCoO2 (x=0.3, 0.5, 0.6, 0.75 and 1.0) is reported. For x=0.6, 0.75, and 1.0, conventional solid-state synthesis was employed. x=0.3 and 0.5 were obtained via oxidative deintercalation of sodium at room temperature. x=0.3 can be hydrated to Na0.3CoO2•1.3H2O which is superconducting with a Tc of 4.3 K. Although having the same chemical stiochiometry as the previously reported two layer superconductor, it has a different stacking sequence of CoO2 layers making it structurally distinct. Crystals of three layer NaCoO2 show triangular morphology compared to hexagonal morphology for two layer Na0.7CoO2.

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1. Takada, K., Sakurai, H., Takayama-Muromachi, E., Izumi, F., Dilanian, R.A. and Sasaki, T., Nature 422 53 (2003).
2. Huang, Q., Foo, M.L., Pascal, R.A. Jr, Lynn, J.W., Toby, B.H., He, Tao, Zandbergen, H.W., Cava, R.J. accepted by Physical Review B.
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5. Zandbergen, H.W., Foo, M.L., Xu, Q., Kumar, V., Cava, R.J. Physical Review B (2004) 70(2) 024101.
6. Schaak, R.E., Klimczuk, T., Foo, M.L. and Cava, R.J., Nature 424 527 (2003).

Synthesis of Three Layer NaxCoO2 (x=0.3, 0.5, 0.6, 0.75, 1.0) and Superconductivity in Three Layer Na0.3CoO2•1.3H2O

  • M.L. Foo (a1), T. Klimczuk (a1), L. Li (a1), N.P. Ong (a1), R.J. Cava (a1), Q. Huang (a2), J.W. Lynn (a2) and H.W. Zandbergen (a3)...

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