The thermoelectric properties of BaxIn0.2−x Co4Sb11.5Te0.5 synthesized at different pressure
The thermoelectric properties of BaxIn0.2−x Co4Sb11.5Te0.5 synthesized at different pressure
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DOI：
10.1016/j.jallcom.2016.08.256
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发表时间：
2017-01
影响因子：
6.2
通讯作者：
L. Wang;J. Ni;X. Jia;J. Qin;Xin Guo;L. Deng
中科院分区：
文献类型：
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作者：
L. Wang;J. Ni;X. Jia;J. Qin;Xin Guo;L. Deng
用高压高温法制备了BaxIn0.2−xCo4Sb11.5Te0.5(x=0.05，0.1，0.15)系列方斜晶石化合物，并用X射线衍射仪和电子探针对其进行了表征。在室温下测量了材料的热电性能，包括塞贝克系数α、电阻率ρ和热导率κ。正如预期的那样，随着合成压力的增加，BaxIn0.2−xCo4Sb11.5Te0.5的塞贝克系数和热导率都有明显的提高。此外，晶格热导率随着压力的增加而明显降低，这主要是由于晶界丰富，可以有效地增强晶界上的声子散射。试验结果表明，高温高压技术是优化热电材料热电性能的一种较好的方法。
A series of skutterudite compounds BaxIn0.2−xCo4Sb11.5Te0.5(x = 0.05, 0.1, 0.15) have been prepared successfully by high pressure and high temperature (HPHT) method and then characterized with X-ray diffraction and electron microprobe analysis. The thermoelectric properties including Seebeck coefficient α, electrical resistivity ρ and thermal conductivity κ were measured at room temperature. As expected, with the synthetic pressure increased, the Seebeck coefficient and thermal conductivity of BaxIn0.2−xCo4Sb11.5Te0.5both improved significantly. Moreover, the lattice thermal conductivity decreased distinctly with pressure increasing, which was mainly due to the abundant grain boundaries, which could enhance the phonon scattering effectively at grain boundaries. The test results suggest that the HPHT technique is a superior method to optimize thermoelectric properties of thermoelectric materials.