Research of percolative thermoelectric materials by means of Thermoelectric-effect spectroscop

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As a study of developing new thermoelectric materials, we have derived a simple but effective method for analyzing thermoelectric properties S(T) by shedding a light on the percolation (PC) phenomenon in ceramic systems. Experimentally, S(T) data in rare-earth element systems are analyzed in terms of our method and estimated a PC index Γ defined originally, revealing that the behavior of Γ is similar to that of the power factor P being used conventionally, which indicates that our method is effective for exploring new thermoelectric materials. Theoretically, we have proposed that the thermoelectric performance could be improved by modeling a two-band semiconductor.