Thermoelectric Properties of TlCu3Te2 and TlCu2Te2 |
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Authors: | H Matsumoto K Kurosaki H Muta S Yamanaka |
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Affiliation: | (1) Graduate School of Engineering, Osaka University, Suita Osaka, 565-0871, Japan |
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Abstract: | We performed thermoelectric characterizations on TlCu3Te2: (Tl1+)(Cu1+)3 (Te2−)2 and TlCu2Te2: (Tl1+)(Tl3+)(Cu1+)4(Te2−)4, in order to understand the relationship between the thermoelectric properties (especially the lattice thermal conductivity
κ
lat) and the valence states of Tl. The thermal conductivity of TlCu2Te2 is high (about 8 W m−1 K−1), while that of TlCu3Te2 is extremely low (around 0.5 W m−1 K−1) like other thallium tellurides. This high κ of TlCu2Te2 was caused not only by its large electronic contribution but also by its intrinsically high κ
lat. The present study implies that the valence states of Tl would play some important roles in determining the magnitude of
κ
lat. |
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Keywords: | Thallium tellurides thermal conductivity electrical resistivity Seebeck coefficient |
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