Impacts of both high pressure and Te–Se double-substituted skutterudite on the thermoelectric properties prepared by HTHP
Impacts of both high pressure and Te–Se double-substituted skutterudite on the thermoelectric properties prepared by HTHP
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高压和Te-Se双取代方钴矿对高温高压制备热电性能的影响
DOI：
10.1016/j.jallcom.2014.07.173
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发表时间：
2014-12
影响因子：
6.2
通讯作者：
Hairui Sun, Xiaopeng Jia, Le Deng, Pin Lv, Xin Gu
中科院分区：
文献类型：
--
作者：
Hairui Sun, Xiaopeng Jia, Le Deng, Pin Lv, Xin Gu
采用高温高压(HTHP)方法成功制备了一系列Te和Se双取代方钴矿化合物Co4Sb11.3Te0.7−xSex(x= 0.05、0.075和0.1)。与其他方法相比，合成时间大幅缩短至半小时。对这些系列样品的微观结构和热电性能进行了认真的研究。高温高压后获得了具有丰富晶界、晶格取向无序和位错的Co4Sb11.3Te0.7−xSex。实验结果表明，随着合成压力的增加，塞贝克系数的绝对值保持相对较大。更重要的是，观察到 Co4Sb11.3Te0.7−xSex 的热导率随着压力的增加而单调下降。对于在 3.5 GPa 下合成的 Co4Sb11.3Te0.6Se0.1，室温下的最小值为 1.8 W m−1K−1。
A series of double-substituting with Te and Se on skutterudite compounds Co4Sb11.3Te0.7−xSex(x= 0.05, 0.075 and 0.1) has been prepared successfully by high-temperature and high pressure (HTHP) method. Comparing with other methods, the synthesis time was sharply reduced to half an hour. Microstructure and thermoelectric properties of these series samples were seriously investigated. Co4Sb11.3Te0.7−xSexwith abundant grain boundaries, disorder in lattice orientation and dislocations were obtained after HTHP. The experimental results suggest that with the synthetic pressure increasing, relative larger absolute values of Seebeck coefficient were maintained. More importantly, the thermal conductivity of Co4Sb11.3Te0.7−xSexwas observed to decrease monotonously with the pressure increasing. The minimum value is 1.8 W m−1K−1at room temperature for Co4Sb11.3Te0.6Se0.1synthesized at 3.5 GPa.
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