Influence of Mn on Crystal Structure and Thermoelectric Properties of GeTe Compounds
Influence of Mn on Crystal Structure and Thermoelectric Properties of GeTe Compounds
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DOI：
10.1007/s13391-014-4149-8
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发表时间：
2014-07-01
影响因子：
2.4
通讯作者：
Park, S. D.
中科院分区：
文献类型：
--
作者：
Lee, J. K.;Oh, M. W.;Park, S. D.
研究了Ge1-xMnxTe化合物在300 ~ 773 K温度范围内的热电性能。随着Mn的加入，化合物的晶体结构逐渐发生变化，由菱形变为立方状细胞。塞贝克系数和电阻率随Mn的增加而增大。通过霍尔系数的测量，证实了载流子浓度的降低是导致电性能变化的原因。Mn的加入也降低了材料的导热系数。当x = 0.05时，获得了最大无因次优值ZT，其中在773 K时ZT = 1.3。Mn晶体结构的演变归因于热电性质的改变。与纯方面体相相比，具有更多立方相的mn掺杂化合物表现出更好的热电性能。
The thermoelectric properties of the Ge1-xMnxTe compounds were investigated in the temperature range from 300 K to 773 K. The crystal structure of the compound was gradually changed with Mn, changing from a rhombohedral to a cubic-like cell. The Seebeck coefficient and the electrical resistivity were increased with Mn. From the Hall coefficient measurement, the reduction of the carrier concentration was confirmed and was responsible for the change of the electrical properties. The thermal conductivity was also reduced with Mn. The maximum dimensionless figure of merit, ZT, was obtained for x = 0.05 composition, where the value was ZT = 1.3 at 773 K. The evolution of the crystal structure with Mn attributed to the change of the thermoelectric properties. The Mn-doped compound which has a more cubic phase than a rhombohedral exhibited superior thermoelectric properties to the pure rhombohedral phase.