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One-dimensional tellurides Ta4SiTe4 and Nb4SiTe4 were found to show highthermoelectric performance below room temperature. This study reported thesynthesis and thermoelectric properties of whisker crystals ofTa4SiTe4-Nb4SiTe4 solid solutions and Mo- or Ti-doped (Ta0.5Nb0.5)4SiTe4.Thermoelectric power of the solid solutions systematically increased withincreasing Ta content, while their electrical resistivity was unexpectedlysmall. Mo- and Ti-doped (Ta0.5Nb0.5)4SiTe4 showed n- and p-type thermoelectricproperties with large power factors exceeding 40 microW cm-1 K-2, respectively.The fact that not only Ta4SiTe4 and Nb4SiTe4 but also their solid solutionsshowed high performance indicated that this system is a promising candidate forthermoelectric applications at low temperatures.

Large Thermoelectric Power Factor in Whisker Crystals of Solid Solutions of the One-Dimensional Tellurides Ta4SiTe4 and Nb4SiTe4