Improvement Mechanism of Thermoelectric Materials by Dispersion of Fine Particles.

The performance of the thermoelectric mater #is represented by the figure of merit Z ： Z={\f2} D12 {\f2}，{\f2}。在订购时，需要有一个很高的优点，一个大的Seebeck协同作用和低电气耐药性，但作为一个低热的导电性。在此study中的影响。The result obtained are as follows ：（1）与{}{}（2）与ultra-？SiC dispersion was obtained by MA of FeSi？D22？D2， Si and C？。这种性能是通过降低热条件而得到市场上的改进的。（3） Electrical resitManagement and thermal conducManagement of CoSb·D23·D2 were markedly decreased by the disperManagement of FeSb·D22·D2 and NiSb·D22·D2 particles with low res·。（4）霍尔效应测量揭示了n型和p型材料的热电性质对矩阵和第二相位之间的电子相互作用有不同的影响。

The performance of the thermoelectric materials is represented by the figure of merit Z : Z=αィイD12ィエD1/ρκ, where α is Seebeck coefficient, ρ is electrical resistivity, and κ is thermal conductivity. In order to obtain a high figure of merit, a large Seebeck coefficient and low electrical resistivity is required, as well as a low thermal conductivity. The effects of dispersion of fine particles on the thermoelectric propeties are investigated in this study.The results obtained are as follows :(1)Thermoelectric materials (β-FeSiィイD22ィエD2 and CoSbィイD23ィエD2) with dispersion of fine particles are obtained by mechanical alloying (MA) and hot-pressing method. (2) β-FeSiィイD22ィエD2 with ultra-fine SiC dispersion was obtained by MA of FeSiィイD22ィエD2, Si and C powders. The performance was markedly improved by decreasing the thermal conductivity. (3) Electrical resitivity and thermal conductivity of CoSbィイD23ィエD2 were markedly decreased by the dispersion of FeSbィイD22ィエD2 and NiSbィイD22ィエD2 particles with low resistivity. (4) Hall effect measurements revealed that dispersion of second phases differently affects the thermoelectric properties of n-type and p-type materials due to the electronic interaction between the matrix and the second phases.