Abstract

Seebeck coefficient has been studied on the single crystals of metallic hexaborides RB₆ (R = La, Pr, Nd, Gd) at temperatures of 2–300 K. The experiment has shown that the signal is limited by the values |S| ≤ 1.5 μV/K for all tested materials. The data obtained for the systems LaB₆ and GdB₆ were approximated by phonon drag contribution caused by quasi-local (Einstein) mode with characteristic temperatures Θ_E(LaB₆) ≈ 240 K and Θ_E(GdB₆) ≈ 180 K. On the contrary, the crystalline electric field effect induces the inversion between negative and positive types of thermoelectricity, which complicates the simulation of phonon drag in the case of PrB₆ and NdB₆.

中文翻译：

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金属六硼化物RB 6（R = La，Pr，Nd，Gd）的热电性能

摘要

已经在2–300 K的温度下研究了金属六硼化物RB ₆（R = La，Pr，Nd，Gd）单晶的塞贝克系数。S | 对于所有测试材料，≤1.5μV/ K。对于系统实验室获得的数据₆和GDB ₆通过用特征温度引起的准本地（爱因斯坦）模式Θ声子曳引贡献近似_È（LAB ₆）≈240 K和Θ _È（GDB ₆）≈180K。相反，晶体电场效应引起热电的负型和正型之间的反转，这在PrB ₆和NdB ₆的情况下使声子阻力的模拟变得复杂。