ABSTRACT EuBiSe3, a narrow-band-gap semiconductor, is synthesized by introducing the rare earth element Eu into Bi2Se3. It can be a potential thermoelectric material due to the relatively complex crystal structure and large effective mass. In this study, the thermoelectric properties of a EuBiSe3 fiber with a diameter of 167 μm have been characterized systematically for the first time from 80 to 290 K by applying our developed T-type method, including thermal conductivity, electrical conductivity and Seebeck coefficient. The thermal conductivity decreases from 1.08 to 0.88 W m−1 K−1 dominated by three-phonon Umklapp scattering and then increases to 1.20 W m−1 K−1 as the temperature increases to 290 K. The electrical conductivity varies from 4209 to 5240 S m−1 in the studied temperature range. The absolute Seebeck coefficient increases slightly to 204 µVK−1 with the increase of temperature. The highest value of the determined dimensionless figure of merit ZT is 0.05, obtained at 290 K.

中文翻译：

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单晶EuBiSe3光纤的热电特性

摘要 EuBiSe3 是一种窄带隙半导体，是通过将稀土元素 Eu 引入 Bi2Se3 中合成的。由于相对复杂的晶体结构和较大的有效质量，它可以成为一种潜在的热电材料。在这项研究中，通过应用我们开发的 T 型方法，首次系统地表征了直径为 167 μm 的 EuBiSe3 纤维在 80 到 290 K 范围内的热电性能，包括热导率、电导率和塞贝克系数。热导率从 1.08 W m-1 K-1 下降到 0.88 W m-1 K-1，主要是三声子 Umklapp 散射，然后随着温度升高到 290 K 增加到 1.20 W m-1 K-1。电导率从 4209 变化到 5240 S m-1 在研究的温度范围内。随着温度的升高，绝对塞贝克系数略微增加到 204 µVK−1。确定的无量纲品质因数 ZT 的最高值为 0.05，在 290 K 下获得。