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| Intergrowth-structured LixNayCoO2 exhibits an enhanced thermoelectric power at room temperature [Ren et al., Journal of Physics: Condensed Matter 18, L379 (2006)]. In this work, LixNayCoO2 ceramics with nominal composition x=0.45 and y=0.35 is studied by the measurement of resistivity, thermopower and magnetic susceptibility. Although the resistivity data show semiconductor-like behavior, the temperature dependence of thermopower indicates metallic character. This apparent controversy suggests that the grain interior is metallic while the grain boundary and/or grain surface is semiconducting. The magnetic susceptibility reveals very weak ferromagnetism below 23 K. Possible origin of this anomaly is discussed. |
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| Keywords:LixNayCoO2, thermopower, magnetic properties |
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