Variable-range-hopping conduction and low thermal conductivity in chalcogenide spinel CuyFe4Sn12X32 (X = S, Se)

K. Suekuni, K. Tsuruta, T. Ariga, M. Koyano

研究成果: Contribution to journalArticle査読

11 被引用数 (Scopus)


Low-temperature thermoelectric properties are reported for polycrystalline samples of chalcogenide spinel CuyFe4Sn12X 32(X = S, Se; y = 8.0 to 4.0). For all samples with X = S, the electrical resistivity ρ behaves similarly to that of a doped semiconductor at high temperatures and shows a variable-range-hopping-type (VRH) temperature dependence at low temperatures. The values of ρ and the thermopower S decrease concomitantly with decreasing initial Cu composition y. For y = 6.0 of the sample with X = Se, ρ shows VRH behavior in a wide temperature range. Because of the monotonic increase of S as T1/2 and the exponential decrease of ρ with increasing temperature due to the the VRH conduction, the sample with X = Se can be a good high-temperature thermoelectric material. Furthermore, both systems show a low thermal conductivity of 1.5 W/Km because of their complex structures.

ジャーナルJournal of Applied Physics
出版ステータス出版済み - 4 15 2011

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)


「Variable-range-hopping conduction and low thermal conductivity in chalcogenide spinel Cu<sub>y</sub>Fe<sub>4</sub>Sn<sub>12</sub>X<sub>32</sub> (X = S, Se)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。