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Ca3Co4O9 is one of the most promising p-type thermoelectric materials because of its high dimensionless figure of merit ZT. However, polycrystalline Ca3Co4O9 ceramics shows lower ZT value than that for single crystal Ca3 Co4O9 due to its higher electrical resistivity ρ. Mikami et al. have reported that the addition of Ag to Ca3Co4O9 ceramics could successfully reduce ρ and enhance the power factor...
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